TWI911699B - Carrier, armrest installation unit, and heigh adjustment mechanism - Google Patents

Abstract

A carrier, an armrest installation unit, and a heigh adjustment mechanism are provided. The carrier includes a backrest assembly, a carrier frame switchable between a folded state and an expanded state, a seat assembly movably disposed on the carrier frame, and a connecting rod assembly movably connected to each of the carrier frame, the seat assembly, and the backrest assembly. The carrier frame drives the backrest assembly to fold toward the seat assembly via the connecting rod assembly when the carrier frame switches from the expanded state to the folded state.

Description

Vehicle, handrail mounting unit, and height adjustment mechanism

This invention relates to a vehicle, a handrail mounting unit, and a height adjustment mechanism.

Vehicles such as strollers, high chairs, and tricycles are increasingly used in families with such needs. However, several problems exist with vehicles currently on the market. Taking strollers as an example, most stroller frames have a folding function for easy storage and transportation, but the folding mechanism is complicated to operate and inconvenient to use. Furthermore, during the folding process, the backrest frame is prone to wobbling towards the seat frame due to the pushing force. Some stroller handles can be reversed for easier childcare, but this reversing causes the seat assembly to move, altering the angle between the seat and backrest components, making adjustments difficult for the user. Strollers typically have a handlebar body that is detachably connected to the armrest. Currently, the detachable connection structure between the handlebar body and the armrest is quite complex. Strollers and other vehicles may have footrests. Due to differences in leg length and riding posture among different passengers, the footrests often need to be adjusted, especially in the height direction, to reduce the pressure on the passenger's legs and improve riding comfort. However, existing height adjustment mechanisms are often complex in structure, inconvenient to operate, and difficult to meet consumer needs.

A first aspect of the invention provides a vehicle comprising: a backrest assembly; a frame switchable between a folded state and an unfolded state; a seat assembly movably disposed on the frame; and a linkage assembly movably connected to the frame, the seat assembly, and the backrest assembly, respectively. When the frame is switched from the unfolded state to the folded state, the linkage assembly can drive the backrest assembly to fold towards the seat assembly.

In some embodiments, the linkage assembly includes a first link and a second link, the first link having a first movable portion and a first connecting portion, the first movable portion being movably connected to the seat assembly and the first connecting portion being connected to the vehicle frame, the second link having a second movable portion and a second connecting portion, the second movable portion being movably connected to the first link and the second connecting portion being connected to the backrest assembly.

In some embodiments, the frame includes a seat tube extending in the longitudinal direction of the vehicle, and the seat assembly includes a movable frame slidably disposed on the seat tube, the first movable part being movably connected to the movable frame.

In some embodiments, the movable bracket is provided with a connecting part, the connecting part is provided with a guide groove, and the first movable part is inserted into the guide groove and can move along the guide groove.

In some embodiments, the guide groove includes a first groove portion and a second groove portion that are interconnected, the first groove portion extending along the movement direction of the movable frame, and the extension direction of the second groove portion intersecting the extension direction of the first groove portion.

In some embodiments, the guide groove has a first end and a second end, with the first movable part located at the first end when the frame is in the unfolded state and at the second end when the frame is in the retracted state.

In some embodiments, the connecting portion is provided with a slot, and the guide groove is disposed on one side wall or two opposite side walls of the slot and penetrates the one side wall or two opposite side walls. The first movable portion extends into the connecting portion through the slot and slides to the guide groove.

In some embodiments, the frame includes a pusher arm linked to the seatpost, the pusher arm being operable to rotate relative to the seatpost to switch the vehicle's direction of travel between a first forward direction and a second forward direction. When the vehicle's direction of travel switches from the first forward direction to the second forward direction, the pusher arm actuates the movable frame along the seatpost toward the first forward direction, and/or the first link moves toward the second forward direction.

In some embodiments, the movable frame has a locking part that engages with the second movable part when the frame is in the unfolded state, and disengages from the second movable part during the rotation and reversal of the pusher frame.

In some embodiments, the first link has a drive groove located between the first movable part and the first connecting part, and the second movable part is inserted into the drive groove and can slide along the drive groove.

In some embodiments, the backrest assembly includes a first backrest frame, a second backrest frame, and a backrest tube. A first end of the first backrest frame is hinged to a second hinge portion of the second connecting rod. A second end of the first backrest frame is hinged to a first end of the second backrest frame. A second end of the second backrest frame is hinged to a first end of the backrest tube. The second end of the backrest tube, the portion of the second connecting rod located between the second movable portion and the second hinge portion, and the movable frame are hinged via a first connecting shaft.

In some embodiments, the second link includes a first link portion and a second link portion connected to each other, the first link portion and the second link portion forming an angle with each other, the second movable portion being at the end of the first link portion away from the second link portion, the second pivot portion being at the second link portion, and the first connecting shaft being located at the connection between the first link portion and the second link portion.

In some embodiments, the backrest assembly further includes a strap and a strap adjuster. The linkage assembly is provided on both the left and right sides of the frame. One end of the strap is connected to the end of the second rod portion on one side of the frame away from the first rod portion. The other end of the strap wraps around the side of the backrest tube opposite to the seat assembly and is connected to the end of the second rod portion on the other side of the frame away from the first rod portion. The strap adjuster is provided on the strap for adjusting the length of the strap.

In some embodiments, the backrest assembly further includes a limiting piece that is pivotally connected between the backrest tube and the second link via the first connecting shaft.

In some embodiments, the frame includes a pusher arm and an auxiliary frame movably connected to the pusher arm, the linkage assembly being linked to the auxiliary frame, the pusher arm being operable to retract the frame by actuating it, and the backrest assembly retracting toward the seat assembly by actuating the linkage assembly via the auxiliary frame and the seat assembly.

A second aspect of the invention provides a carrier comprising: a retractable frame; a limiting block disposed on the frame and having a telescopic portion; a movable frame disposed on the frame; and a backrest disposed on the frame and having a movable end. When the frame is switched from an extended state to a retracted state, the backrest rotates in a first direction to approach the movable frame, and the telescopic portion is adapted to abut against the movable end to exert a rotational force on the backrest in a second direction, the first direction being opposite to the second direction.

In some embodiments, the limiting block further includes a body portion fixed to the frame. The telescopic portion includes: a slider that slides with the body portion for abutting against the movable end; and an elastic return member held between the body portion and the slider.

In some embodiments, the body portion has a guide groove, the telescopic portion is installed in the guide groove, and the slider can elastically extend and retract relative to the opening of the guide groove under the action of the elastic reset member.

In some embodiments, the bottom of the guide groove opening has an outwardly protruding extended support, and/or a limiting protrusion is provided on the upper part or above the guide groove opening.

In some embodiments, a limiting mechanism is provided between the slider and the body portion to limit the sliding stroke of the slider. The limiting mechanism includes: a limiting hole disposed on one of the guide groove wall and the slider; and a limiting protrusion disposed on the other of the guide groove wall and the slider; the limiting protrusion slidably engages with the limiting hole.

In some embodiments, the body portion has a first end face; when the frame is in the deployed state, the first end face abuts against the movable end to restrict the rotation of the backrest.

In some embodiments, the first end face is located above the telescopic portion, and/or a limiting protrusion is formed at the intersection of the end face of the guide groove opening and the first end face.

In some embodiments, the limiting block further includes a body portion fixed to the frame. The telescopic portion is mounted on the body portion and is elastically deformable.

In some embodiments, the movable frame is movably mounted on the frame. When the frame is in the extended position, the movable end is adapted to clamp between the limiting block and the movable frame. When the frame switches to the retracted position, the movable frame moves away from the limiting block to allow the backrest to rotate.

In some embodiments, the frame includes a seatpost, the limiting block is fixed to the seatpost, the swivel frame is slidably engaged with the seatpost, and the backrest is linked to the swivel frame. The frame also includes a pusher arm and a drive assembly, the rotation of the pusher arm driving the swivel frame along the seatpost via the drive assembly.

In some embodiments, the driving component includes a first driving rod, a second driving rod, and a connecting pin. The first driving rod and the pusher frame are both fitted onto the connecting pin, and the second driving rod is connected to the movable frame. When the pusher frame rotates, it drives the first driving rod to rotate via the connecting pin. The limiting block also includes a body portion with a hole through which the connecting pin passes to limit the relative movement between the limiting block and the seat tube.

A third aspect of the invention provides a vehicle comprising: a frame; a seat assembly mounted on the frame and movable relative to the frame in a longitudinal direction between a first position and a second position; a backrest assembly mounted on the seat assembly and angularly adjustable relative to the seat assembly; a push arm hinged to the frame and driving the seat assembly to move relative to the frame in a longitudinal direction when pivoting relative to the frame; and a linkage mechanism disposed on one side of the seat assembly and connected to the backrest assembly, the linkage mechanism such that the angular adjustment range of the backrest assembly relative to the seat assembly is the same when the seat assembly is in the first position and the second position.

In some embodiments, the backrest assembly includes a backrest tube and a strap, the bottom of the backrest tube being pivoted to the seat assembly, the end of the strap being connected to the linkage mechanism, and the backrest tube supporting the strap. The linkage mechanism is also connected to the seat assembly and causes the end of the strap to move synchronously with the seat assembly in the longitudinal direction of the vehicle frame.

In some embodiments, the linkage mechanism includes a linkage rod, a first end of which is connected to the seat assembly, and a second end of which is connected to the end of the strap. When the seat assembly moves along the front-rear direction of the vehicle frame, the seat assembly drives the end of the strap to move along the front-rear direction of the vehicle frame via the linkage rod.

In some embodiments, the frame includes two side frames and a seatpost mounted between the two side frames. The seat assembly includes a movable frame mounted on the seatpost, and the pusher arm drives the movable frame to move relative to the seatpost along the longitudinal direction of the frame when pivoting relative to the frame. A first end of a linkage is connected to the movable frame, and a second end of the linkage is movably connected to the side frames along the longitudinal direction of the frame. When the movable frame moves relative to the seatpost along the longitudinal direction of the frame, the movable frame actuates the end of the strap along the longitudinal direction of the frame via the linkage.

In some embodiments, the linkage is disposed between the movable frame and the side frame, the movable frame having a recess on the side facing the linkage, and the first end of the linkage is received in the recess.

In some embodiments, the linkage rod has a first protrusion on the side facing the movable frame, and the recess of the movable frame has a groove or through hole, the first protrusion being received in the groove or through hole.

In some embodiments, the movable frame has a second protrusion on the side opposite to the linkage rod, and the linkage mechanism also includes an elastic element, one end of which is encircled around the second protrusion, and the other end of which is hooked onto the side of the linkage rod opposite to the movable frame.

In some embodiments, the backrest assembly includes a backrest tube and a strap, the bottom of which is hinged to the seat assembly, and the end of the strap is connected to the linkage mechanism, with the backrest tube supported on the strap. The linkage mechanism includes a transmission component and a sliding component, the sliding component being movably mounted to the frame along the longitudinal direction and connected to the end of the strap. The transmission component is connected to both the push-arm bracket and the sliding component, and is capable of converting rotation of the push-arm bracket into movement of the sliding component along the longitudinal direction of the frame, thereby causing the end of the strap and the seat assembly to move synchronously along the longitudinal direction of the frame.

In some embodiments, the sliding member includes a sliding portion and a connecting portion, the connecting portion being connected to the transmission assembly, the sliding portion being fixedly connected to the end of the strap, and the transmission assembly driving the sliding portion to move along the front-rear direction of the frame via the connecting portion.

In some embodiments, the transmission component includes a linkage gear, the sliding member is provided with teeth, the push arm is fixedly connected to a pivot shaft passing through the frame, the pivot shaft is connected to the linkage gear and can drive the linkage gear to rotate, the linkage gear meshes with the sliding member, and the rotation of the linkage gear can cause the sliding member to move along the front-rear direction of the frame.

In some embodiments, the transmission component further includes a driven gear and an output gear, wherein the driving gear meshes with the sliding member through the driven gear; and the driven gear meshes with the sliding member through the output gear.

In some embodiments, the linkage mechanism further includes a traction member and a drive wheel. The drive wheel is sleeved on the pivot shaft and can rotate with the pivot shaft. The traction member is connected to the drive wheel and the linkage gear respectively. When the drive wheel rotates, it can drive the linkage gear to rotate through the traction member.

In some embodiments, the traction element is a cable, one end of which is fixed to a first position of the linkage gear, and the other end of which extends to the drive wheel, passes around the drive wheel, extends back to the linkage gear, and is fixed to a second position opposite to the first position. The portion of the cable wound around the drive wheel is also fixed to a certain position of the drive wheel. When the drive wheel rotates, the lengths of the cable portions on both sides of the drive wheel and the linkage gear change, thereby causing the linkage gear to rotate as well.

In some embodiments, the frame has a cavity, and the vehicle further includes a mounting base disposed within the cavity. The mounting base includes a housing, and a baffle is provided on the inner wall of the housing. The baffle divides the housing into a first accommodating space and a second accommodating space. The sliding part of the sliding member is disposed in the first accommodating space and slidably disposed on the baffle. The transmission component is disposed in the second accommodating space. The mounting base further includes a cover body, which is mounted to the housing and together with the housing defines the second accommodating space. The transmission component is disposed between the cover body and the housing. One end of the connecting portion extends beyond the upper end of the cover body and extends to the outside of the cover body. The cover body is provided with an opening, through which the transmission component is connected to the connecting portion.

In some embodiments, the frame includes two side frames, the seat assembly is mounted between the two side frames, the side frames are provided with grooves extending in the front-rear direction of the frame, the end of the strap is slidably mounted to the groove, and the linkage mechanism causes the end of the strap to slide in the groove in the front-rear direction of the frame when the pusher arm rotates relative to the frame.

In some embodiments, the backrest assembly includes a backrest tube and a strap. The bottom of the backrest tube is pivoted to the seat assembly, and the end of the strap is connected to the linkage mechanism. The backrest tube is supported on the strap. The linkage mechanism includes a guide and a connector. The guide is attached to the frame, and the end of the strap passes through the guide and connects to the connector. The connector is connected to the seat assembly and can move with the seat assembly along the front-rear direction of the frame. Thus, the backrest tube moves synchronously with the seat assembly via the strap. The connector can be a separate connector or integrally formed with the strap.

A fourth aspect of the present invention provides a handrail mounting unit, comprising: a first connector having a card-operating part; a first magnetic member disposed on the first connector; a second connector having a locking member; and a second magnetic member disposed on the second connector. The first connector and the second connector are detachably connected by the detachable engagement of the card-operating part and the locking member, and by the magnetic attraction of the first magnetic member and the second magnetic member.

In some embodiments, the second connector has a first receiving space and an insertion hole communicating with the first receiving space, and the engaging member includes at least one resilient arm located in the first receiving space. The dispensing part is adapted to enter or exit the first receiving space through the insertion hole. The dispensing part is provided with at least one engaging slot for detachably engaging with the at least one resilient arm.

In some embodiments, the card-attaching portion includes a protrusion, and the at least one engaging slot is disposed on the protrusion. The protrusion is adapted to extend into the second connector to allow the at least one engaging slot to engage with the at least one elastic arm.

In some embodiments, the first connector is provided with an anti-rotation plate, which is non-rotatably fitted into the insertion hole. The protrusion is provided on the anti-rotation plate, and the first connector has a first receiving cavity located in the protrusion, and the first magnetic member is installed in the first receiving cavity.

In some embodiments, the at least one engaging groove includes an annular groove disposed on the outer peripheral wall of the protrusion. The at least one elastic arm includes two elastic arms disposed opposite to each other and forming a second receiving space for receiving the protrusion, wherein the two elastic arms hold the annular groove when the protrusion is located in the second receiving space.

In some embodiments, a support is provided in the first accommodating space of the second connector, the first ends of the two elastic arms are connected by a fixing part, the fixing part is fixed to the support, the second ends of the two elastic arms are opposite to each other and spaced apart, the support is provided with a spacer, the spacer is close to the first ends of the two elastic arms and located between them, and the spacer is adapted to abut against the two elastic arms.

In some embodiments, the second connector is further provided with a release element and a resilient reset element; wherein the release element is operably connected to the engaging element for pushing the at least one resilient arm to disengage from the at least one engaging slot; and the resilient reset element is used to drive the release element to reset.

In some embodiments, the release element has at least one push portion, and the at least one elastic arm has at least one abutment portion, each of the push portions being adapted to push the corresponding abutment portion to disengage the at least one elastic arm from the at least one engagement slot.

In some embodiments, a boss is provided in the accommodating space, the boss having a guide surface opposite to the abutment, the pusher being sandwiched between the guide surface and the abutment, and the pusher having a sliding surface that slides with the guide surface.

In some embodiments, the first connector includes a connector body and a mounting base; the mounting base is mounted on the connector body by a fastening mechanism, or the mounting base and the connector body are integrally formed. The card slot is disposed on the mounting base. The connector body is integrally formed with or attached to the handrail. The second connector is hinged to the handrail body by a pivot, the axis of which is perpendicular to the insertion/removal direction of the card slot.

A fifth aspect of the present invention provides a vehicle height adjustment mechanism, comprising: a front foot support assembly; a foot pedal capable of sliding along the front foot support assembly in a height direction; and a locking assembly disposed between the front foot support assembly and the foot pedal, the locking assembly being switchable between a locked state and an unlocked state; when the locking assembly is in the locked state, the foot pedal is fixed relative to the front foot support assembly at a certain height position, and/or, the foot pedal is operable to move along a first direction; when the locking assembly is in the unlocked state, the foot pedal is operable to move along the first direction or a second direction; the first direction and the second direction are opposite and both parallel to the height direction.

In some embodiments, the locking component includes: a first locking groove disposed in the forefoot support component, the first locking groove being a unidirectional locking groove for restricting the foot pedal from moving in the second direction; and/or a second locking groove disposed in the forefoot support component, the second locking groove being a bidirectional locking groove for restricting the foot pedal from moving in both the first and second directions; and a locking mechanism. A locking member is movably disposed at one end of the foot pedal. The locking member can be switched between a locked position and an unlocked position. When the locking member is in the locked position, the end of the locking member extending from the foot pedal is inserted into the first locking groove or the second locking groove. When the locking member is in the unlocked position, the locking member is released from the first locking groove or the second locking groove.

In some embodiments, the locking assembly further includes: an operating member operably disposed on the foot pedal and drivenly connected to the locking member, the operating member being operable to drive the locking member from the locked position to the unlocked position; and a linkage member, a first end of which is drivenly connected to the operating member, and a second end of which is fixedly connected to the locking member, the operating member being operable to activate the linkage. A component drives the locking member to switch from the locked position to the unlocked position; a first reset component is disposed between the operating component and the foot pedal, the first reset component is used to bias the operating component to move the operating component in the direction that drives the locking member to move to the locked position; a second reset component is disposed between the locking member and the foot pedal, the second reset component is used to bias the locking member to move the locking member to the locked position.

In some embodiments, the first locking groove has a first abutting ramp that gradually slopes towards the foot pedal along the first direction. The second locking groove has a first limiting sidewall and a second limiting sidewall at its two ends along the height direction. The second locking groove is located in the first direction of the first locking groove.

In some embodiments, the foot pedal has a hollow cavity, and the locking member and the linkage are movably disposed within the hollow cavity. A portion of the operating member extends into the hollow cavity and connects to the linkage, while another portion of the operating member extends out of the hollow cavity for operation. The portion of the operating member extending into the hollow cavity has a drive groove, the extension direction of which intersects the movement direction of the operating member and the movement direction of the locking member. A first end of the linkage is inserted into the drive groove and can move along the drive groove. The operating member has a mounting cavity communicating with the hollow cavity, and a first reset member is disposed between the top of the hollow cavity and the bottom of the mounting cavity and is elastically retractable.

In some embodiments, the portion of the foot pedal in the hollow cavity where the locking member is installed has a first protrusion, the locking member has a second protrusion opposite to the first protrusion, and the second protrusion is located on the side of the first protrusion near the forefoot support assembly, and the second reset member is sleeved on the locking member and its two ends abut against the first protrusion and the second protrusion respectively.

In some embodiments, the front foot support assembly includes: a front foot support rod of the vehicle frame; a guide fixed to the side of the front foot support rod facing the foot pedal; and a locking assembly disposed between the guide and the foot pedal.

In some embodiments, the forefoot support assembly is provided with a guide groove extending along the direction of movement of the foot pedal, the foot pedal comprising: a pedal body for supporting the user's feet; and a snap-fit element integrally formed with the pedal body. The snap-fit element is at least partially inserted into the guide groove and is slidable along the guide groove.

In some embodiments, the height adjustment mechanism further includes a snap-fit member disposed between the forefoot support assembly and the foot pedal, the snap-fit member being retractably or movably connected to the foot pedal; the forefoot support assembly is provided with a guide groove extending along the movement direction of the foot pedal. The snap-fit member includes a snap-fit body and a connecting portion that are interconnected and angled together, the snap-fit body being at least partially inserted into the guide groove and slidable along the guide groove, and one end of the foot pedal being provided with a notch, the connecting portion being inserted into the notch.

In some embodiments, the locking component includes a third locking groove disposed on the forefoot support component and located in a second direction of the first locking groove. The third locking groove has a second abutting ramp that gradually slopes towards the foot pedal along the first direction. The third locking groove also has a mounting opening opposite the second abutting ramp. The locking member can be inserted into the third locking groove through the mounting opening.

In some embodiments, the height adjustment mechanism further includes a limiting member connected to the guide member and located in the second direction of the third locking slot. When the locking member is inserted into the third locking slot, the foot pedal abuts against the limiting member to restrict the foot pedal from moving in the second direction.

To make the purpose, technical solution, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only for explaining this invention and do not limit the scope of protection of this invention.

It should be noted that when a component is said to be "fixed to" another component, it can be directly on the other component or there may be a centered component. When a component is considered to be "connected to" another component, it can be directly connected to the other component or there may be a centered component present. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only and do not represent the only implementation.

Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art within the scope of this invention. The terms used herein in the description of this invention are for the purpose of describing particular embodiments only and are not intended to limit the invention. The term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.

The present invention provides a vehicle that can be a child vehicle, such as a stroller, a high chair, a tricycle, etc., or a wheelchair, a high chair, etc.

It should be noted that, unless otherwise expressly specified and limited, the directional terms such as "front," "rear," "left," and "right" in the various embodiments of this invention are based on the "front," "rear," "left," and "right" orientations when the child vehicle is in the deployed state and the child is facing forward. Furthermore, arrows P and Q are used to schematically indicate the "front" and "rear" directions, and arrows L and R are used to schematically indicate the "left" and "right" directions in the figures. These directional terms are only used to make the description of the embodiments of this invention clearer and are not intended to unduly limit the scope of protection of this invention.

First aspect

Figure 1 shows a perspective view of a vehicle 1000 in its unfolded state according to the first aspect of the present invention, and Figure 2 shows an exploded view of the vehicle. As shown in Figures 1 and 2, the vehicle is illustrated using a child vehicle such as a stroller as an example, and may include components such as a frame 100, a seat assembly 200, and a backrest assembly 400. In this embodiment, the structure of the child vehicle is substantially symmetrical about the longitudinal mid-plane (not shown in the figures; the longitudinal mid-plane can also be referred to as the left-right symmetry plane). Of course, in some alternative embodiments, such as child vehicles with an asymmetrical braking system, the structure of the child vehicle may not be perfectly symmetrical.

Figures 1 and 2 illustrate an exemplary embodiment of the frame 100, which includes components such as a seatpost 110, a pusher frame 120, a handrail frame 130, an auxiliary frame 140, a connecting frame 150, a front support frame 160, and a rear support frame 170. The frame 100 is foldable, with the folded state corresponding to the folded state of a child vehicle and the unfolded state corresponding to the unfolded state of a child vehicle. Of course, in some alternative embodiments, the frame 100 may have other embodiments besides those shown herein.

The structure of the frame 100 shown in the first aspect of the present invention will now be described with reference to Figures 1 and 2.

The frame 100 includes two seatposts 110 located on the left and right sides, each seatpost 110 extending generally forward and backward. The seat assembly 200 includes a movable frame 220 mounted on each seatpost 110, with the movable frame 220 on the same side slidingly engaging with the seatpost 110. The seat assembly 200 also includes a seat frame 230 connected between the two movable frames 220, which is used to directly or indirectly (through the seat cushion) support the child's buttocks.

The pusher arm 120 is generally U-shaped and includes a first pusher rod 122 and a second pusher rod 123 located on the left and right sides. The upper ends of the first pusher rod 122 and the second pusher rod 123 are connected by a pusher body 121. In some embodiments, the extension length of the pusher body 121 relative to each pusher rod (first pusher rod 122 and second pusher rod 123) is adjustable. Each pusher rod is linked to the seat tube 110 on the same side via a hinge shaft 630.

The handrail frame 130 includes, for example, a first handrail 132 and a second handrail 133 located on the left and right sides, with the front ends of the first handrail 132 and the front ends of the second handrail 133 connected by a handrail body 131. The handrail body 131 is installed on each handrail (first handrail 132 and second handrail 133) in a detachable or non-detachable manner.

The frame 100 may include, for example, two auxiliary frames 140 and two connecting frames 150 located on the left and right sides. Each auxiliary frame 140 is hinged to the handrail on the same side, specifically via a pivot 93. Each connecting frame 150 is hinged to the auxiliary frame 140 on the same side, specifically via a pivot 630.

The front support frame 160 of the frame 100 includes, for example, a first front support rod 161 and a second front support rod 162 located on both sides, with a foot pedal 190 connecting the first front support rod 161 and the second front support rod 162. The rear support frame 170 includes a first rear support rod 171 and a second rear support rod 172 symmetrically arranged on both sides, with a rear crossbar 173 connecting the first rear support rod 171 and the second rear support rod 172. A front wheel assembly 181 is respectively installed at the lower end of each front support rod (first front support rod 161 and second front support rod 162). Rear wheel assemblies 182 are respectively installed at the lower ends of each rear support rod (first rear support rod 171 and second rear support rod 172). The armrest, front support rod and rear support rod on the same side are hinged by pivot 92, and the front support rod and seat tube 110 on the same side are hinged by pivot 91. The connecting frame 150 and the rear support rod on the same side are hinged by pivot 94. The connection relationship between the right-side components of the child vehicle of the first aspect of the present invention will be described in detail below with reference to Figures 1 and 2. Since the structure of a child vehicle is basically symmetrical, the connection relationship of the left-side components of a child vehicle can be referenced to the connection relationship of the right-side components described below.

The front support rod and seat tube 110 on the same side are hinged by a pivot 91. Specifically, the front end of the right seat tube 110 has a hole 1101, and the middle of the second front support rod 162 has a hole 1601. The seat tube 110 and the second front support rod 162 are hinged by a pivot 91 passing through holes 1101 and 1601. The upper end of the second front support rod 162 has a hole 1602, the upper end of the second rear support rod 172 has a hole 1702, and the front end of the second handrail 133 has a hole 1301. The second handrail 133, the second front support rod 162, and the second rear support rod 172 are hinged by pivots 92 passing through holes 1301, 1602, and 1702. The rear end of the second handrail 133 has a hole 1302, and the upper end of the auxiliary frame 140 has a hole 1402. The second handrail 133 and the auxiliary frame 140 are hinged by pivots 93 passing through holes 1302 and 1402. The rear end of the seat tube 110 has a hole 1102, the lower end of the auxiliary frame 140 has a hole 1401, the upper end of the connecting frame 150 has a hole 1502, and the lower end of the second push rod 123 has a hole 1201. The seat tube 110, auxiliary frame 140, connecting frame 150, and second push rod 123 are linked by a connecting shaft 630 passing through holes 1102, 1401, 1502, and 1201. The lower end of the connecting frame 150 has a hole 1501, and the middle of the second rear support rod 172 has a hole 1701. The connecting frame 150 and the second rear support rod 172 are linked by a connecting shaft 94 passing through holes 1501 and 1701.

Referring to Figure 1, the frame 100 is held in the unfolded state by locking the relative rotation between the auxiliary frame 140 and the connecting frame 150. Conversely, when it is necessary to fold up the child vehicle, the relative rotation between the auxiliary frame 140 and the connecting frame 150 must first be released, and then the push handle 120 can be rotated to fold up the entire frame 100.

Referring to Figures 1 and 2, this embodiment also illustrates an exemplary embodiment of a retraction locking mechanism 700 for locking relative rotation between the auxiliary frame 140 and the connecting frame 150. Specifically, a groove 1403 extending along the length of the auxiliary frame 140 is provided on the auxiliary frame 140, and a locking pin 730 is slidably disposed in the groove 1403, the locking pin 730 being adapted to slide along the groove 1403 between holes 1401 and 1402. A locking groove 1503 is formed on the connecting frame 150. When the frame 100 switches from a retracted state to an extended state, the auxiliary frame 140 and the connecting frame 150 rotate relative to each other about the pivot axis 630. When the child vehicle is switched to the unfolded position, the locking groove 1503 aligns with the slide groove 1403, and the locking pin 730 can be inserted into the locking groove 1503 under the push of the elastic return member inside the auxiliary frame 140. At this time, the locking pin 730 is simultaneously located in the slide groove 1403 and the locking groove 1503, thereby locking the relative rotation between the auxiliary frame 140 and the connecting frame 150 and keeping the child vehicle in the unfolded position. In some embodiments, the locking pin 730 includes, for example, a locking part 731 and a first pushing part 732. The locking part 731 is used to slide with the slide groove 1403 and is used to insert into the locking groove 1503, and the first pushing part 732 protrudes laterally relative to the locking part 731.

Referring to Figures 1 and 2, this embodiment also illustrates an exemplary embodiment of an operating mechanism for relative rotation between the release assist frame 140 and the connecting frame 150. Specifically, a first operating member 710 is mounted on the pusher body 121, which may be, for example, a button. First sliders 740 are respectively provided on each pusher lever (first pusher lever 122 and second pusher lever 123), and each first slider 740 slides in engagement with the corresponding pusher lever (first pusher lever 122 or second pusher lever 123). The first operating member 710 is connected to each first slider 740, for example, via a traction member (not shown in the figures, such as a rope) inside the pusher frame 120, and each first slider 740 has a laterally protruding second abutment 741. When the frame is in the extended position, the second abutment 741 is located below the first abutment 732 on the same side. When it is necessary to retract the frame 100, the first operating member 710 is pressed, which drives the first slider 740 to move upward. The first slider 740 drives the locking pin 730 to disengage from the locking groove 1503 through the contact between the second abutment 741 and the first abutment 732, thereby releasing the relative rotation between the locking auxiliary frame 140 and the connecting frame 150. In some embodiments, each push lever (first push lever 122 and second push lever 123) may be provided with an elastic reset member. When the first operating member 710 is released from pressing, the elastic reset member can push the corresponding first slider 740 to reset, and the first operating member 710 will also be reset.

Referring to Figures 1 and 2, this embodiment also illustrates an exemplary embodiment for positioning the pusher frame 120. Specifically, each pusher rod (first pusher rod 122 and second pusher rod 123) is provided with a second slider 920, and each second slider 920 is provided with a locking groove 921. Each auxiliary frame 140 is provided with a first locking block 930, and each front support rod (first front support rod 161 and second front support rod 162) is provided with a second locking block 940. When the pusher frame 120 rotates back and forth around the pivot axis 630, the first engaging block 930 of the auxiliary frame 140 and the second engaging block 940 of the front support rod selectively engage in the engaging groove 921, so that the pusher frame 120 is positioned in a first backward tilt position (as shown in Figure 1, with the first engaging block 930 of the auxiliary frame 140 engaged in the engaging groove 921), or positioned in a second forward tilt position (not shown in the figure, with the second engaging block 940 of the front support rod engaged in the engaging groove 921). The switching between the first backward tilt position and the second forward tilt position of the pusher frame 120 corresponds to the reversal of the pusher frame 120. When the pusher 120 is in the first position, the child riding in the child vehicle faces forward in the direction of travel and has his/her back to the caregiver pushing the pusher 120. When the pusher 120 is in the second position, the child riding in the child vehicle faces backward in the direction of travel and faces the caregiver pushing the pusher 120.

Each second slider 920 slides in conjunction with a corresponding push rod 122, 123. A second operating member 910 is also provided inside each push rod 122, 123. The second operating member 910 is connected to the second slider 920, for example, via a second traction member (not shown in the figure, such as a rope) inside the push rod 122, 123. When the second operating member 910 is operated, it can drive the second slider 920 upward along the push rod 122, 123 via the second traction member. At this time, the engagement groove 921 of the second slider 920 can disengage from either the first engagement block 930 or the second engagement block 940. At this time, rotating the pusher frame 120 will align and engage the locking groove 921 of the second slider 920 with the second locking block 940 or the first locking block 930, thus completing the forward and backward reversal of the pusher frame 120. Each pusher lever 122, 123 may also be equipped with an elastic reset component for pushing the corresponding second slider 920 back to its original position.

In another embodiment (not shown), the traction member connecting the first operating member 710 and the first slider 740 is simultaneously connected to the second slider 920. When the reversing pusher arm 120 is needed, pressing the first operating member 710 pulls the second slider 920 upward, easily disengaging the engagement groove 921 of the second slider 920 from one of the first engagement block 930 and the second engagement block 940. Then, the pusher arm 120 is rotated so that the engagement groove 921 of the second slider 920 aligns and engages with the other of the first engagement block 930 and the second engagement block 940. Each pusher lever may be provided with an elastic reset member for pushing the corresponding second slider 920 back to its original position.

In an embodiment where the first operating member 710 is simultaneously connected to the first slider 740 and the second slider 920, when the first operating member 710 is pressed, the first slider 740 also moves upward, thereby releasing the locking pin 730. To prevent the locking pin 730 from accidentally releasing when the pusher arm 120 reverses direction, in some embodiments, the stroke by which the first slider 740 drives the locking pin 730 to release is greater than the stroke by which the engagement groove 921 of the second slider 920 disengages from the engagement of the engagement blocks 930 and 940. In some embodiments, a first indicator and a second indicator can also be configured on the pusher arm 120 for the first operating member 710. When the first operating member 710 moves to the first indicator, the engaging groove 921 corresponding to the second slider 920 disengages from the first engaging block 930 or the second engaging block 940. At this time, the pusher arm 120 can be pushed to change direction, while the locking pin 730 remains locked to maintain the relative rotation between the auxiliary frame 140 and the connecting frame 150. When the first operating member 710 moves to the second indicator, the first slider 740 drives the locking pin 730 to release the relative rotation between the auxiliary frame 140 and the connecting frame 150. At this time, the frame 100 can be retracted.

Referring to Figures 1 and 2, in some embodiments, each engaging block 930, 940 may have downwardly extending baffles 931, 941. Each push rod may also be fixedly provided with a fastener 980, located below the corresponding second slide block 920, and facing the engaging groove 921. When the push rod frame 120 is in the first position, each fastener 980 abuts against the first baffle 931 of the first engaging block 930 on the corresponding auxiliary frame 140. When the push rod frame 120 is in the second position, each fastener 980 abuts against the second baffle 941 of the second engaging block 940 on the corresponding front support rod. The configuration of baffles 931, 941 and fasteners 980 can limit the reversing rotation range of pusher 120.

Referring again to Figures 1 and 2, in some embodiments, the frame 100 further includes a drive assembly 600, through which the rotation of the pusher arm 120 drives the movable frame 220 to move along the seat tube 110. In some embodiments, referring to Figure 1, with the frame 100 in the unfolded state, when the pusher arm 120 rotates about the pivot axis 630 in a first direction S1 (S1 is clockwise in the figure, for example) to switch from a first position to a second position, the movable frame 220 slides forward relative to the seat tube 110. Conversely, when the pusher arm 120 rotates around the pivot axis 630 in the second direction S2 (S2 in the figure is counterclockwise for example) to switch from the second position to the first position, the movable frame 220 slides backward relative to the seat tube 110. Since the seat frame 230 is used to support the child's buttocks, the forward and backward movement of the movable frame 220 is equivalent to the child vehicle's center of gravity shifting forward and backward according to the change of direction of the pusher arm 120, so that the child vehicle's center of gravity is always close to the caregiver pushing the pusher arm 120, which helps the caregiver push the child vehicle with less effort.

Referring to Figures 2 to 4, this embodiment also illustrates an exemplary embodiment of the drive component 600, although the embodiments of the drive component 600 are not limited to those shown herein. The drive component 600 includes a linkage mechanism 640 and the aforementioned hinge shaft 630. The hinge shaft 630 rotates synchronously with the pusher frame 120, and the linkage mechanism 640 is connected between the hinge shaft 630 and the movable frame 220 to convert the rotation of the hinge shaft 630 into movement of the movable frame 220 along the seat tube 110.

Figures 3 and 4 also illustrate exemplary embodiments of the linkage mechanism 640. Of course, in some alternative embodiments, the linkage mechanism 640 is not limited to the examples given herein. The linkage mechanism 640 includes, for example, a first drive rod 610 and a second drive rod 620. A first end of the first drive rod 610 has a hole 601, through which the first drive rod 610 is fitted onto a hinge shaft 630 and rotates synchronously with the hinge shaft 630. The second end of the first drive rod 610 and the first end of the second drive rod 620 are connected by a hinge shaft 660. The second end of the second drive rod 620 has a hole 603, which is hinged to a hole 302 (Figure 2) on the movable frame 220 via a second rotating shaft N. When the pusher frame 120 reverses direction, the pusher frame 120 drives the pivot shaft 630 to rotate synchronously, the pivot shaft 630 drives the first drive rod 610 to rotate synchronously, and the second drive rod 620 drives the movable frame 220 to move back and forth along the seat tube 110.

Figures 3 and 4 also illustrate exemplary embodiments of the pivot shaft 630. Of course, in some alternative embodiments, the implementation of the pivot shaft 630 is not limited to those illustrated herein. The pivot shaft 630 includes, for example, a first shaft segment 631, a second shaft segment 632, and a third shaft segment 633 connected in sequence. The first shaft segment 631 is used to fit into the hole 1102 of the seat tube 110 for pivoting with the seat tube 110. The diameter of the second shaft segment 632 is greater than that of the first shaft segment 631, and at least a portion of the length of the second shaft segment 632 is provided with a cross-section 6321. The hole 601 of the first drive rod 610 has a cross-section 6011. The fit between the cross-section 6321 and the cross-section 6011 ensures the synchronous rotation of the first drive rod 610 and the pivot shaft 630. At least a portion of the length of the third shaft segment 633 is provided with a cross-section 6331. The holes 1201 of each push rod (first push rod 122 and second push rod 123) have a cross-section 1205 (see Figure 2). The fit between the cross-section 6331 and the cross-section 1205 ensures the synchronous rotation of the push rod frame 120 and the pivot shaft 630. Of course, there are many other ways to achieve synchronous linkage between the push rod frame 120, the pivot shaft 630 and the first drive rod 610, and it is not limited to the cross-section fit described above.

The portion of the pivot shaft 630 located between facets 6321 and 6331 is used for pivoting with bore 1401 of the auxiliary frame 140 and bore 1502 of the connecting frame 150. In some embodiments, the pivot shaft 630 may include a shoulder 634 having a larger diameter and located between facets 6321 and 6331. A bushing (not shown) may be fitted onto the shoulder 634, through which bores 1401 and 1502 can be pivoted to the pivot shaft 630. The connecting frame 150 is located, for example, between the auxiliary frame 140 and the push rod on the same side of the pivot shaft 630 in the axial direction.

Referring to Figures 1 to 3, in some embodiments, the pivot shaft 630 has a center hole 635 for a fastener 650 to pass through. The fastener 650 may be, for example, a bolt or a rivet, which can easily secure the irregularly shaped pivot shaft 630 to the various components fitted on the pivot shaft 630.

Referring again to Figures 1 and 2, this embodiment also illustrates an exemplary embodiment of the backrest component 400. Of course, in some alternative embodiments, the backrest component 400 may have other embodiments. In this embodiment, the backrest component 400 includes, for example, a backrest frame 410, a backrest tube 450, a strap adjuster 440, and a strap 430. The backrest frame 410 and the backrest tube 450 are hinged to a first rotating shaft M, which is, for example, disposed on a movable frame 220. The backrest frame 410 and the backrest tube 450 can rotate about the first rotating shaft M respectively. The strap adjuster 440 and the strap 430 are connected to the backrest frame 410.

The backrest 410 is, for example, U-shaped, and includes a first backrest bar 412 and a second backrest bar 413 located on the left and right sides, and a backrest body 411 connected to the upper ends of the two backrest bars (the first backrest bar 412 and the second backrest bar 413). The two backrest bars are respectively connected to holes 301 on the movable frame 220 on the same side through a first rotating shaft M. In this way, when the frame 100 is in the unfolded state and the movable frame 220 moves back and forth relative to the seat post 110, the backrest 410 moves synchronously with the movable frame 220 and maintains the same front-to-back relationship with the movable frame 220.

The backrest tube 450 is, for example, U-shaped, with its two vertical tubes connected to the backrest frame 410 via a first pivot M. A seat fabric (not shown) wraps around the backrest frame 410 and the backrest tube 450, forming a backrest section within the area defined by the backrest tube 450, which provides back support for the child. In some alternative embodiments, a rigid backrest board (not shown) may be provided in the backrest section. Straps 430 are connected to the respective backrest bars (first backrest bar 412 and second backrest bar 413), pass around the backrest tube 450, and connect to a strap adjuster 440 located behind the backrest board. The tilt angle of the backrest tube 450 and the backrest panel can be adjusted by increasing or decreasing the length of the strap 430 located between each backrest bar and the strap adjuster 440. Implementation of the strap adjuster 440 can be found in related art and will not be elaborated here. Of course, in some alternative embodiments, the backrest assembly 400 may not have the backrest tube 450, and the backrest panel may be connected to the backrest frame 410 only via a seat fabric; the tilt angle of the backrest panel can still be adjusted by the strap adjuster 440 and the strap 430.

In some embodiments, the child vehicle may also include a connector (not shown) for limiting the range of rotation of the backrest 410 to prevent excessive rotation of the backrest 410 about the first axis of rotation M in the second direction S2 or in the first direction S1. In some embodiments, the connector may include, for example, a flexible band connecting the handrail (first handrail 132 or second handrail 133) and the backrest (first backrest 412 or second backrest 413) on the same side; however, the embodiment of the connector is not limited to this.

During the retraction of the frame, the backrest 410 is prone to swaying towards the movable frame 220 due to the thrust. Referring to Figures 1, 2, and 5, the child vehicle may also include a limiting block 1600, an exemplary embodiment of which is shown in this embodiment. Of course, in some alternative embodiments, the limiting block 1600 may have other embodiments. The limiting block 1600 can be mounted at any suitable location on the frame 100 to limit the rotation of the backrest 410 as needed.

In this embodiment, the limiting block 1600 includes, for example, a limiting body portion 1610, which has, for example, a mounting groove 1611 through which the limiting block 1600 is fixed to the rear end of the seat tube 110. As can be seen from Figures 2 and 5, the seat tube 110 is a flat tube, and the mounting groove 1611 is correspondingly a flat groove, so the limiting block 1600 and the seat tube 110, which are fitted together, will not rotate circumferentially. In addition, the limiting body portion 1610 of the limiting block 1600 may be provided with a hole 1612 through which the pivot shaft 630 passes. The pivot shaft 630 is used to limit the relative movement between the limiting block 1600 and the seat tube 110, and to fix the limiting block 1600 to the seat tube 110. Of course, the structure of the limit block 1600 and the seat tube 110 is not limited to the examples in this embodiment, and correspondingly, the way in which the circumferential rotation and axial movement of the limit block 1600 and the seat tube 110 are restricted is also not limited to the examples in this embodiment. For example, in some alternative embodiments, the mounting groove 1611 of the limit block 1600 is connected to the seat tube 110 through a cross section, and the hole 1612 of the limit block 1600 can be connected to the seat tube 110 through a pin parallel to the pivot shaft 630.

Referring again to Figure 1, each backrest bar (first backrest bar 412 and second backrest bar 413) has a movable end 414, which is located, for example, at the bottom of the corresponding backrest bar and below the first pivot M. When the frame 100 is in the deployed state and the pusher arm 120 is in the first tilted position, the movable end 414 is clamped, for example, between the limiting block 1600 and the movable frame 220, thereby positioning the backrest frame 410. More specifically, the limiting block 1600 may have a first end face 1613, and the movable frame 220 may have a locking portion 226. The first end face 1613 is opposite to the locking portion 226 and is adapted to clamp the movable end 414 from both sides, thereby positioning the backrest frame 410. The first end face 1613 and the latching portion 226 may have surface shapes that mate with the movable end 414. In some embodiments, the movable end 414 extends obliquely at the bottom of the backrest bar, and the first end face 1613 and the latching portion 226 extend obliquely accordingly. In some embodiments, when the frame 100 is in the deployed state and the pusher arm 120 is in the forward-leaning second position, the movable arm 220 is pushed to the front of the seat tube 110, and the movable end 414 remains in contact with the latching portion 226 of the movable arm 220 while disengaging from the first end face 1613 of the limiting block 1600. At this time, the latching part 226 on the movable frame 220 restricts the rotation of the backrest 410 in the second direction S2, while the backrest 410 is held by the connecting member (not shown in the figure) mentioned above, which restricts the rotation of the backrest 410 in the first direction S1. Thus, the backrest 410 is positioned by the cooperation of the latching part 226 and the connecting member.

Figure 6 shows a perspective view of the child vehicle in one state between the deployed and folded states. Figure 7 shows a cross-sectional view of the child vehicle in another state between the deployed and folded states. Figure 8 shows a perspective view of the child vehicle in the folded state. The folding process of the child vehicle will be explained below with reference to Figures 1, 2, 6 to 8.

Referring to Figures 1 and 2, when the child vehicle needs to be folded, press the operating element 710 to release the lock between the auxiliary frame 140 and the connecting frame 150. Then, push the pusher frame 120 to rotate the auxiliary frame 140 around the pivot axis 630 in the first direction S1, and the connecting frame 150 rotates around the pivot axis 94 in the second direction S2. The rotation of the connecting frame 150 will cause the seat tube 110 to rotate around the pivot axis 91 in the second direction S2, and each handrail will rotate around the pivot axis 92 in the second direction S2, thereby causing the front foot support frame 160 and the rear foot support frame 170 to move closer to each other, and finally fold in the folded state shown in Figure 8.

Referring to Figures 6 and 7, during the folding process of the child vehicle, the movable frame 220 moves along the seat tube 110 away from the limit block 1600 as the pusher frame 120 rotates. The locking part 226 separates from the movable end 414, creating space for the backrest frame 410 to rotate. While the pusher frame 120 rotates in the first direction S1, it pushes the backrest frame 410 to rotate around the first axis M in the first direction S1, causing the backrest frame 410 to move closer to the movable frame 220.

When the frame 100 switches from the unfolded state to the retracted state, the backrest 410 is continuously subjected to the thrust from the pusher frame 120, which makes it very easy for it to wobble uncontrollably in the first direction S1, so that the backrest 410 cannot retract stably along with the pusher frame 120. Therefore, the limiting block 1600 in this embodiment is provided with a telescopic part 1620. When the frame 100 switches from the unfolded state to the retracted state, the telescopic part 1620 is adapted to abut against the movable end 414 of the backrest bar on the same side and apply a force to the backrest 410 rotating in the second direction S2, thereby counteracting the thrust of the backrest 410 rotating in the first direction S1, so that the backrest 410 can be stably retracted together with the pusher frame 120, thus relieving the swaying phenomenon of the backrest 410 during the retraction process of the frame 100.

Referring to Figures 5 to 7, in some embodiments, the telescopic portion 1620 is disposed below the first end face 1613. When the backrest 410 rotates about the first axis of rotation M in the first direction S1, when the movable end 414 rotates onto the telescopic path of the telescopic portion 1620, the telescopic portion 1620 abuts against the movable end 414 and applies force to the backrest 410. In some alternative embodiments, the telescopic path of the telescopic portion 1620 may pass through at least a portion of the first end face 1613.

Figures 5, 7, and 8 illustrate exemplary embodiments of the telescopic portion 1620; however, embodiments of the telescopic portion 1620 are not limited to those exemplified in this embodiment. The telescopic portion 1620 may include a slider 1621 and an elastic return member 1622. The slider 1621 slides with the limiting body 1610 for abutting against the movable end 414. In some embodiments, the slider 1621 may be made of a high-strength and wear-resistant material, for example. The elastic return member 1622 is clamped between the limiting body 1610 and the slider 1621 to allow the slider 1621 to elastically extend and retract when abutting against the movable end 414. The elastic return member 1622 may be, for example, a spring. In some alternative embodiments, the telescopic portion 1620 may have a resilient structure or be made directly of a resilient material. The telescopic portion 1620 is mounted on the limiting body portion 1610 and is resiliently deformable to apply a force for rotation in the second direction S2 to the backrest 410 by abutting the movable end 414.

Referring to Figure 5, in some embodiments, the limiting body 1610 may be provided with a guide groove 1614. The guide groove 1614, for example, has a slot 1615 facing the movable end 414 and a slot bottom opposite to the slot 1615. The slot bottom may be a closed structure. The telescopic part 1620 may be installed in the guide groove 1614 through the slot 1615 and may elastically extend and retract relative to the slot 1615. More specifically, the slider 1621 slides in conjunction with the guide groove 1614, and the elastic return member 1622 is clamped between the bottom of the guide groove 1614 and the slider 1621. Under the action of the elastic return member 1622, the slider 1621 can elastically extend and retract relative to the groove opening 1615. The slider 1621 located outside the groove opening 1615 is used to abut against the movable end 414. Of course, in some alternative embodiments, the telescopic part 1620 can also be connected to the limiting body part 1610 through other suitable structures. That is, the telescopic part 1620 is not limited to being installed on the limiting body part 1610 through the guide groove 1614.

Referring to Figure 5, in some embodiments, a limiting mechanism 1630 may be provided between the slider 1621 and the main body 1610. The limiting mechanism 1630 is used to limit the sliding stroke of the slider 1621 and prevent the telescopic part 1620 from accidentally disengaging from the guide groove 1614. The limiting mechanism 1630 may include, for example, a limiting hole 1631 provided on the groove wall of the guide groove 1614 and a limiting protrusion 1632 provided on the slider 1621. The limiting protrusion 1632 and the limiting hole 1631 are slidably engaged. In some embodiments, the limiting hole 1631 may be, for example, an elongated hole, and the limiting protrusion 1632 may be, for example, a pin mounted on the slider 1621. In some alternative embodiments, the positions of the limiting hole 1631 and the limiting protrusion 1632 on the wall of the guide groove 1614 and the slider 1621 can be interchanged.

Referring to Figure 5, in some embodiments, the bottom of the slot 1615 of the guide groove 1614 has an outwardly protruding extended support 1616. This extended support 1616 provides additional support for the slider 1621 that extends relative to the slot 1614. In some embodiments, a limiting protrusion 1617 may be provided at the upper part of the slot 1614, opposite to the extended support 1616, and the limiting protrusion 1617 can restrict the movable end 414 from excessively rotating about the first axis of rotation M in the first direction S1. In some embodiments, the limiting protrusion 1617 may be provided above the slot 1615 of the guide groove 1614, for example, at the intersection of the end face 1618 of the slot 1615 and the first end face 1613.

Second aspect

To facilitate storage and transportation, most vehicles on the market, such as strollers, have a folding function, for example, the seat can be folded in conjunction with the frame. The backrest and back panel on the seat of such strollers are generally adjusted by adjusting the length of the straps to adjust the angle of the backrest. However, because the backrest needs to be fixed and folded, and the frame needs to be linked to the backrest on the seat to fold and unfold synchronously during the folding or unfolding process, the mechanism is complicated to operate and inconvenient to use.

As shown in Figure 9, the second aspect of the present invention provides a vehicle, which can be a children's stroller. The stroller's frame 100 is linked to the backrest assembly 400, which has a simple structure and is easy to use.

Specifically, as shown in Figures 9 and 10, the stroller includes a frame 100, a seat assembly 200, a backrest assembly 400, a drive assembly 600, a folding and locking mechanism 700, and a linkage assembly 1500. The frame 100 is switchable between a folded and an unfolded state. The seat assembly 200 is movably mounted on the frame 100. The linkage assembly 1500 is movably connected to both the frame 100 and the seat assembly 200. The backrest assembly 400 is movably connected to the seat assembly 200 via the linkage assembly 1500. When the frame 100 switches from the unfolded state to the folded state, the linkage assembly 1500 can drive the backrest assembly 400 to fold towards the seat assembly 200. The drive assembly 600 is disposed between the pusher arm 120 and the movable frame 220 of the seat assembly 200 (described later), and the frame 100 can be operated to drive the movable frame 220 along the seat tube 110 of the frame 100 (described later) via the drive assembly 600.

Specifically, as shown in Figures 9 and 10, the frame 100 includes a seatpost 110, a pusher frame 120, a handrail frame 130, an auxiliary frame 140, a connecting frame 150, a front support frame 160, and a rear support frame 170. The handrail frame 130 includes a handrail body 131 and handrail bars 132 and 133. Both the front support frame 160 and the rear support frame 170 are generally H-shaped frame structures. The two upper ends of the front support frame 160 are hinged to the two upper ends of the rear support frame 170, while the two lower ends of the front support frame 160 and the two lower ends of the rear support frame 170 are spaced apart to form a stable triangular support structure. Two sets of front wheel assemblies 181 are provided at the two lower ends of the front support frame 160, and two sets of rear wheel assemblies 182 are provided at the two lower ends of the rear support frame 170. The handrail body 131 is generally a U-shaped rod structure, with both ends detachably or non-detachably connected to the two hinge points of the front support frame 160 and the rear support frame 170. There are two handrails, designated as the first handrail 132 and the second handrail 133, both roughly aligned with the front-to-back direction of the trolley. The front ends of both handrails 132 and 133 are hinged to the hinge points of the front support frame 160 and the rear support frame 170. Two auxiliary frames 140 are correspondingly provided, with their upper ends hinged to the rear ends of the two handrails 132 and 133, respectively. Two connecting frames 150 are correspondingly provided, both roughly L-shaped. One end of each connecting frame 150 is hinged to the lower end of each auxiliary frame 140, and the other end is hinged to the left and right sides of the rear support frame 170, respectively. Specifically, the pusher frame 120 includes a pusher body 121 with a generally U-shaped frame structure and two pusher rods 122 and 123 connected to both ends of the pusher body 121. The ends of the two pusher rods 122 and 123 are both hinged to the seat tube 110.

Specifically, as shown in Figures 9 and 10, two seat posts 110 are respectively located on the left and right sides of the stroller. The seat assembly 200 includes movable frames 220 that are slidably mounted on the two seat posts 110 and seat frames 230 fixed to the two movable frames 220. The structure is explained below using one side of the seat post 110 and movable frame 220 as an example:

As shown in Figures 11 to 13, the seat tube 110 extends approximately along the front-to-back direction of the trolley, and its front and rear ends are respectively connected to the front leg support frame 160 and the rear leg support frame 170. The movable frame 220 includes a sliding sleeve 221, a connecting part 222, a first mounting part 223, and a second mounting part 224.

A sliding sleeve 221 is fitted around the seat tube 110 and can move along the seat tube 110. A connecting part 222 is connected to the lower side of the sliding sleeve 221. The connecting part 222 is provided with a slot 2221, and a guide groove 2222 penetrating the slot 2221 is provided on one side wall or two opposite side walls of the slot 2221. The connecting part 222 is generally L-shaped frame structure, including a first connecting section 2223 and a second connecting section 2224 that are connected to each other. The first connecting section 2223 extends in a direction parallel to the seat tube 110 and is connected to the sliding sleeve 221 on one side. One end of the second connecting section 2224 is connected to one end of the first connecting section 2223, and the extending direction of the second connecting section 2224 intersects the extending direction of the first connecting section 2223. The second connecting section 2224 is angled with the sliding sleeve 221, and a groove 225 is formed between the second connecting section 2224 and the sliding sleeve 221 (as shown in Figure 13). The groove wall of the groove 225 forms a snap-fit portion 226. The guide groove 2222 includes a first groove portion 2222a and a second groove portion 2222b that are interconnected. The first groove portion 2222a extends along the moving direction of the movable frame 220, and the extending direction of the second groove portion 2222b intersects the extending direction of the first groove portion 2222a. The end of the first groove portion 2222a that is away from the second groove portion 2222b is the first end 2222c, and the end of the second groove portion 2222b that is away from the first groove portion 2222a is the second end 2222d. In this embodiment, the guide groove 2222 is arranged generally along the extending direction of the connecting portion 222. In other embodiments, the connecting portion 222 may have other shapes, and the guide groove 2222 does not need to be arranged along the extending direction of the connecting portion 222. The first mounting portion 223 is connected to the inner side of the sliding sleeve 221, that is, the side of the sliding sleeve 221 opposite to the seat tube 110 on the other side. One side of the seat frame 230 is mounted on the first mounting portion 223. The second mounting portion 224 is provided on the upper rear side of the sliding sleeve 221. In this embodiment, the movable frame 220 is a one-piece molded structure.

Specifically, as shown in Figures 12 and 13, the drive assembly 600 includes a first drive lever 610 and a second drive lever 620 connected to each other. The end of the first drive lever 610 away from the second drive lever 620 is connected to the pusher arm 120, and the end of the second drive lever 620 away from the first drive lever 610 is connected to the movable frame 220. In this embodiment, the end of the second drive lever 620 away from the first drive lever 610 is connected to the second mounting portion 224 of the movable frame 220. Thus, during the folding or unfolding of the frame 100, the movable frame 220 can be slid along the seat tube 110 by the rotation of the pusher arm 120. In this embodiment, the drive assembly 600 further includes a pivot shaft 630. One end of the pivot shaft 630 is fixed to the end of the push rods 122 and 123, and the other end of the pivot shaft 630 passes sequentially through the connecting frame 150, the auxiliary frame 140, and the end of the first drive rod 610 furthest from the second drive rod 620, and is pivoted to the rear end of the seat tube 110. The end of the first drive rod 610 furthest from the second drive rod 620 is fixed to the pivot shaft 630. Thus, when the push rods 122 and 123 rotate, the first drive rod 610 and the second drive rod 620 can be driven to rotate through the pivot shaft 630, thereby pushing the movable frame 220 to slide along the seat tube 110 through the second drive rod 620.

Furthermore, as shown in Figures 12 and 13, the trolley may also include a retraction locking mechanism 700. The retraction locking mechanism 700 may specifically include a first operating member 710, a first traction member (not shown in the accompanying figures), a locking pin 730, and a first slider 740. In this embodiment, the first operating member 710 is one and operably located approximately in the center of the push handle body 121, but this is not a limitation. There are two of each of the first traction member, locking pin 730, and first slider 740, and they are respectively located on the left and right sides of the trolley. The following description uses one side of the retraction locking mechanism 700 as an example:

As shown in Figures 12 and 13, the first slider 740 is slidably disposed on the push rods 122 and 123. One end of the first traction member is connected to the first operating member 710, and the other end is connected to the first slider 740. When the first operating member 710 is operated, the first slider 740 can be driven to slide upward along the push rods 122 and 123 via the first traction member. The connection between the auxiliary frame 140 and the connecting frame 150 forms a first locking groove 1503a. The side of the auxiliary frame 140 facing the push rods 122 and 123, that is, the outer side of the auxiliary frame 140, is provided with a sliding groove 1403, and the locking pin 730 is slidably disposed in the sliding groove 1403. When the trolley is switched to the unfolded state, the locking pin 730 can switch between the unfolded locked position and the unfolded unlocked position. Specifically, when the trolley is switched to the unfolded state, the first locking groove 1503a aligns with the slide groove 1403, and the locking pin 730 can be inserted into the first locking groove 1503a (i.e., in the unfolded locked position) to lock the frame 100 in the unfolded state. The locking pin 730 can disengage from the first locking groove 1503a (i.e., in the unfolded unlocked position) to release the locking of the frame 100 in the unfolded state, and the frame 100 can be folded up. The locking pin 730 includes a locking part 731 and a first pushing part 732 connected to each other. The locking part 731 is slidably disposed in the slide groove 1403 and can be inserted into the first locking groove 1503a. One end of the first pushing part 732 is fixed to the locking part 731, and the other end protrudes toward the push handles 122 and 123. The first slider 740 is provided with a second pushing part 741 protruding toward the auxiliary frame 140. The second pushing part 741 abuts against the lower side of the first pushing part 732. Thus, when the first operating member 710 is operated, the first operating member 710 can pull the first slider 740 upward through the first traction member. At the same time, the first slider 740 drives the locking pin 730 upward to the unfolded release position through the abutment between the first pushing part 732 and the second pushing part 741. The locking part 731 of the locking pin 730 disengages from the first locking groove 1503a, thereby releasing the locking of the frame 100 in the unfolded state.

As shown in Figures 13, 17a, and 17b, a second locking groove 1503b can also be formed at the connection between the auxiliary frame 140 and the connecting frame 150. When the trolley is switched to the folded state, the locking pin 730 can switch between the folded locked position and the folded unlocked position. Specifically, when the trolley is switched to the folded state, the second locking groove 1503b is aligned with the slide groove 1403, and the locking pin 730 can be inserted into the second locking groove 1503b (i.e., in the folded locked position) to lock the frame 100 in the folded state. The locking pin 730 can disengage from the second locking groove 1503b (i.e., in the retracted/unlocked position) to release the frame 100 from the retracted state, allowing the frame 100 to unfold. When the first operating member 710 is operated, the first operating member 710 can pull the first slider 740 upward via the first traction member. Simultaneously, the first slider 740 drives the locking pin 730 upward to the retracted/unlocked position through the abutment between the first abutment part 732 and the second abutment part 741. The locking part 731 of the locking pin 730 disengages from the second locking groove 1503b, thereby releasing the frame 100 from the retracted state.

The first locking groove 1503a and the second locking groove 1503b can be disposed on opposite sides of the pivot shaft 630 that links the connecting frame 150 and the auxiliary frame 140. When the frame 100 is in the unfolded state, the first locking groove 1503a is aligned with the slide groove 1403. When the frame 100 switches from the unfolded state to the retracted state, the connecting frame 150 rotates relative to the auxiliary frame 140 around the pivot shaft 630, and when the frame 100 switches to the retracted state, the second locking groove 1503b is aligned with the slide groove 1403.

Furthermore, the trolley may also include a reversing locking mechanism 900. Specifically, the reversing locking mechanism 900 may include a second operating member 910, a second traction member (not shown in the accompanying figures), and a second slider 920. As shown in Figure 10, there are two second operating members 910, each operably disposed inside the two push handles 122 and 123. Referring also to Figures 12 and 13, there are also two second traction members and two second sliders 920, each disposed on the left and right sides of the trolley. The following description uses one side of the reversing locking mechanism 900 as an example:

As shown in Figures 12 and 13, the second slider 920 is slidably disposed on the push handles 122 and 123, and the second slider 920 is located above the first slider 740, that is, the second slider 920 is located on the side of the first slider 740 near the push handle body 121. One end of the second traction member is connected to the second operating member 910, and the other end is connected to the second slider 920. The upper end of the auxiliary frame 140 is also provided with a first engaging block 930. Please refer to Figure 9 for reference. The upper end of the front foot support frame 160 is provided with a second engaging block 940. The second slider 920 is provided with an engaging groove 921 (Figure 10) that can engage with the first engaging block 930 or the second engaging block 940. Please also refer to Figure 10. As mentioned above, when the second operating member 910 is operated, it can drive the second slider 920 to slide upward along the push handles 122 and 123 via the second traction member. At this time, the engagement groove 921 of the second slider 920 can disengage from the first engagement block 930 and rotate around the pivot shaft 630 until the engagement groove 921 of the second slider 920 engages with the second engagement block 940. In this way, the trolley can be reversed. Before reversing, the front support frame 160 is in front of the rear support frame 170, and after reversing, the front support frame 160 is behind the rear support frame 170. It should be noted that the "front" and "rear" referred to here are with reference to the direction of travel of the stroller. Specifically, the direction of travel when the front support 160 of the stroller is in front of the rear support 170 can be denoted as the first direction of travel F1, as shown in Figure 15; the direction of travel when the front support 160 of the stroller is behind the rear support 170 can be denoted as the second direction of travel F2, as shown in Figure 16.

Specifically, as shown in Figures 13 and 14, the trolley is equipped with linkage components 1500 on both the left and right sides. The specific structure of one of the linkage components 1500 is explained below as an example:

The linkage assembly 1500 includes a first linkage 1510 and a second linkage 1520. The first linkage 1510 is generally elongated and has a first movable portion 1511 and a first connecting portion 1512. In this embodiment, the first movable portion 1511 and the first connecting portion 1512 are located at opposite ends of the first linkage 1510. The first movable portion 1511 is movably connected to the seat assembly 200, and the first connecting portion 1512 is connected to the frame 100. In this embodiment, the first movable portion 1511 has a first movable protrusion 15111. One end of the first connecting rod 1510, having a first movable portion 1511, is inserted into the connecting portion 222 via a slot 2221. A first movable protrusion 15111 is inserted into a guide groove 2222 of the connecting portion 222 and can slide along the guide groove 2222, allowing the first movable portion 1511 to slide relative to the connecting portion 222. Thus, the first connecting rod 1510 is movably fitted into the slot 2221 and guided and positioned by the first movable protrusion 15111 and the guide groove 2222, increasing the stability of the first connecting rod 1510's movement. When the trolley is in the unfolded state, the first movable protrusion 15111 is located at the first end 2222c of the guide groove 2222. When the trolley is in the folded state, the first movable protrusion 15111 is located at the second end 2222d of the guide groove 2222. The first hinge portion 1512 is hinged to the lower end of the auxiliary frame 140 via the pivot shaft 97. In this embodiment, the seat tube 110 mentioned above is hinged to the auxiliary frame 140 via the hinge shaft 630, and the hinge shaft 630 is located away from the lower end of the auxiliary frame 140 relative to the pivot shaft 97, that is, the hinge shaft 630 is located above the pivot shaft 97. The first link 1510 also has a drive groove 1513, which is located between the first movable portion 1511 and the first hinge portion 1512 and extends along the length of the first link 1510.

Further, as shown in Figures 13 and 14, the second link 1520 includes a first link portion 1521 and a second link portion 1522 connected to each other. The first link portion 1521 and the second link portion 1522 are at an angle to each other and are not perpendicular, that is, the second link 1520 is approximately L-shaped. A second movable portion 1523 is provided at the end of the first link portion 1521 away from the second link portion 1522, and a second hinge portion 1524 is provided at the second link portion 1522. The second movable portion 1523 is movably hinged to the first link 1510, and the second hinge portion 1524 is hinged to the backrest assembly 400. In this embodiment, the second movable part 1523 is provided with a second movable protrusion 15231, which is inserted into the drive groove 1513 of the first connecting rod 1510 and can slide along the drive groove 1513. The connection between the first rod part 1521 and the second rod part 1522 is linked to the backrest tube 450 of the backrest assembly 400 (described later) via a first connecting shaft 95. Furthermore, when the trolley is in the unfolded state, the second movable protrusion 15231 engages with the locking part 226 on the movable frame 220 to better maintain the trolley in the unfolded state. As shown in Figure 9, when the trolley is in the folded state, the second movable protrusion 15231 disengages from the locking part 226 on the movable frame 220. In other embodiments, the first link 1521 or the second link 1522 may be hinged to the backrest tube 450 of the backrest assembly 400 via the first connecting shaft 95. The second link 1524 is hinged to the first backrest frame 410 of the backrest assembly 400 via the second connecting shaft 96 (see below for details).

Specifically, as shown in Figures 12 to 14, the backrest assembly 400 includes a first backrest frame 410, a second backrest frame 420, a backrest tube 450, a strap 430, and a strap adjuster 440.

As shown in Figures 12 to 14, the first backrest frame 410 includes two generally elongated backrest rods 412 and 413 located on the left and right sides of the trolley. The lower ends of the two backrest rods 412 and 413 are respectively connected to the second hinge portions 1524 of the two second connecting shafts 96. The second backrest frame 420 is generally U-shaped and includes a backrest horizontal frame 421 and backrest vertical frames 422 respectively connected to both ends of the backrest horizontal frame 421. The upper ends of the two backrest rods 412 and 413 are respectively hinged to both ends of the backrest horizontal frame 421, and the ends of the two backrest vertical frames 422 that are away from the backrest horizontal frame 421 are respectively hinged to the backrest tubes 450. The backrest tube 450 is generally U-shaped. As mentioned above, the two ends of the backrest tube 450 are respectively connected to two second links 1520 via a first connecting shaft 95. Furthermore, the backrest assembly 400 may also include two arc-shaped limiting pieces 460. Each limiting piece 460 is linked between one end of the backrest tube 450 and one of the second links 1520. Providing the limiting piece 460 between the backrest tube 450 and the second link 1520 helps reduce swaying during rotation of the backrest tube 450. The backrest tube 450 can be used to fix a backrest plate (not shown in the accompanying figures). The first backrest frame 410, the second backrest frame 420, and the backrest tube 450 of the backrest assembly 400 can be covered with a tarpaulin or similar covering to create a space for infants and toddlers to lean against or lie down.

Furthermore, as shown in Figure 12, one end of the strap 430 is connected to the second link 1520 of the linkage assembly 1500 on one side, and the other end of the strap 430 passes over the side of the backrest tube 450 facing away from the seat assembly 200 and is connected to the second link 1520 of the linkage assembly 1500 on the other side. The strap adjuster 440 is provided on the strap 430 for adjusting the length of the strap 430. In this embodiment, as shown in Figure 14, the two ends of the strap 430 are respectively connected to the ends of the second link 1520 on the same side that are away from the first link 1510. The connection point of the strap 430 with the second link 1520 is located on the side of the second connecting shaft 96 away from the first link 1510, that is, on the upper side of the second connecting shaft 96, that is, on the upper end of the second rod portion 1522.

Furthermore, the length of the strap 430 can be adjusted between a first length and a second length via the strap adjuster 440. The first length is the minimum length of the strap 430, and the second length is the maximum length of the strap 430. When the strap 430 is at the first length, as shown in Figure 14, the backrest tube 450 is at a first tilt angle relative to the seat assembly 200, the backrest tube 450 and the second backrest frame 420 are in the same plane, and the trolley is in seat mode. When the strap 430 is at the second length, as shown in Figure 15, the backrest tube 450 is at a second tilt angle relative to the seat assembly 200, and the trolley is in reclining mode. As can be seen from the side cross-section of the stroller shown in Figure 15, the backrest tube 450, the second backrest frame 420, the first backrest frame 410, and the second rod portion 1522 of the second connecting rod 1520 are connected end to end to form a roughly rectangular frame structure, allowing the infant's back and head to lie within the space enclosed by the backrest tube 450, the second backrest frame 420, the first backrest frame 410, the second rod portion 1522 of the second connecting rod 1520, and the tarpaulin. The second tilt angle is greater than the first tilt angle.

Figure 16 shows a schematic diagram of the stroller structure when the strap 430 is at its second length and the pusher arm 120 is reversed. Referring also to Figure 15, when the pusher arm 120 is rotated to change the stroller's direction of travel from the first forward direction to the second forward direction, the pusher levers 122 and 123 will drive the first drive lever 610 and the second drive lever 620 to pivot via the pivot shaft 630. The second drive lever 620 will then push the movable frame 220 and the seat frame 230 to move along the seat tube 110 in the third direction D3. As shown in Figure 16, this causes the movable frame 220 and the seat frame 230 to move backward (along the D3 direction), which shifts the center of gravity of the infant sitting on the seat frame 230 backward, making it easier for the caregiver to push the stroller. Furthermore, as shown in Figures 15 and 16, when the trolley's direction of travel changes from the first forward direction to the second forward direction, the first link 1510 moves relative to the movable frame 220 in the second forward direction until the first movable part 1511 is approximately located at the junction of the first groove 2222a and the second groove 2222b, and the first link 1510 extends out of the connecting part 222 through the groove 2221.

Furthermore, as shown in Figures 14 to 16, regardless of the length of the strap 430 or whether the trolley is moving in the first or second direction, as long as the trolley is in the unfolded state, the second movable protrusion 15231 can engage with the locking part 226 on the movable frame 220, thereby limiting the second connecting rod 1520 and fixing the backrest tube 450 at a certain tilt angle.

The following explanation uses the right side of the stroller as an example to illustrate its folding process; the folding process for the left side of the stroller is roughly the same:

When the trolley needs to be folded, as shown in Figures 9 and 10, the first operating member 710 on the pusher frame 120 can be operated, causing the first operating member 710 to drive the first slider 740 to slide towards the pusher body 121 in the first direction D1 via the first traction member. At the same time, as shown in Figures 12 and 13, the first slider 740 pushes the first abutting part 732 on the locking pin 730 via the second abutting part 741, causing the locking pin 730 to slide along the first direction D1 until it disengages from the first locking groove 1503a. The folding locking mechanism 700 is released, and the pusher frame 120 is pressed down. The pusher frame 120 and the auxiliary frame 140 can rotate and fold towards the seat tube 110 in the second direction D2 in Figure 12. During the rotation and retraction process of the auxiliary frame 140, the movable frame 220 will also slide towards the front end of the seat tube 110 through the linkage of the first drive rod 610 and the second drive rod 620, that is, slide along the third direction D3 in Figure 12. At the same time, as shown in Figures 12 and 14, the movable frame 220 sliding along the third direction D3 will also drive the first movable protrusion 15111 to slide along the first groove 2222a through the cooperation of the guide groove 2222 and the first movable protrusion 15111, that is, the first connecting rod 1510 slides in the opposite direction of the third direction D3. At the same time, due to the sliding of the movable frame 220, the second movable protrusion 15231 of the second connecting rod 1520 and the locking part 226 of the movable frame 220 (see Figure 13) will be disengaged. When the pusher frame 120 is pressed down further, the pusher frame 120 and the auxiliary frame 140 will rotate further, thereby driving the pivot shaft 97 to move downward, and further pulling the first movable protrusion 15111 of the first link 1510 to slide to the second groove 2222b. As shown in Figure 17, during the process of the first movable protrusion 15111 sliding to the second end 2222d of the guide groove 2222, the angle between the first link 1510 and the pusher rods 122 and 123 gradually decreases, that is, the first link 1510 rotates clockwise relative to the pivot shaft 97, that is, it pivots along the fourth direction D4 in Figure 17. Simultaneously, when the first link 1510 slides, it also drives the second link 1520 to rotate counterclockwise around the first connecting shaft 95 through the cooperation of the drive groove 1513 and the second movable protrusion 15231 (see Figure 5), that is, to pivot along the fifth direction D5 in Figure 14 or Figure 17. During the rotation of the second link 1520, it also drives the first backrest frame 410 and backrest tube 450, which are connected to it, along with the entire backrest assembly 400, to pivot and retract towards the seat assembly 200, thereby completing the overall folding of the trolley. Figures 17a and 17b show schematic diagrams of the stroller in its folded state. At this time, the movable frame 220 slides to a position near the front end of the seat post 110, the first movable protrusion 15111 moves to the second end 2222d, and the second movable protrusion 15231 is approximately located in the middle of the drive groove 1513. The backrest assembly 400, seat assembly 200, and frame 100 are folded together, occupying less space and facilitating storage and carrying. At this time, the slide groove 1403 and the second locking groove 1503b are aligned, allowing the first operating member 710 to be released. This allows the first slider 740 to move in the opposite direction of the first direction D1 under the action of the slider reset member (not shown in the accompanying figures) until the locking pin 730 is inserted into the second locking groove 1503b, locking the stroller in the folded state.

Conversely, when the folded trolley needs to be unfolded, as shown in Figures 17a and 17b, the first operating member 710 can be operated. This causes the first operating member 710 to slide the first slider 740 towards the pusher body 121, i.e., in the first direction D1, via the first traction member. Simultaneously, the first slider 740 pushes the first abutment 732 on the locking pin 730 via the second abutment 741, causing the locking pin 730 to slide along the first direction D1 until it disengages from the second locking groove 1503b. This releases the folding locking mechanism 700, disengaging the trolley from its folded state. At this point, the pusher frame 120 can be lifted, causing the pivot shaft 97 to move upwards. The pivot shaft 97 drives the first link 1510 to rotate counterclockwise relative to the pivot shaft 97, pivoting along the fifth direction D5 in Figure 17a. This causes the first movable protrusion 15111 to slide along the guide groove 2222 from the second end 2222d to the first end 2222c. At the same time, the first link 1510, through the cooperation of the drive groove 1513 and the second movable protrusion 15231 (see Figure 14), drives the second link 1520 to rotate clockwise around the first connecting shaft 95, that is, to rotate along the fourth direction D4. During the rotation of the second link 1520, it also drives the first backrest frame 410 and backrest tube 450, along with the entire backrest assembly 400, to pivot and unfold away from the seat assembly 200, as shown in Figure 14. At this time, the slide 1403 and the first locking groove 1503a are aligned, and the first operating member 710 can be released, so that the first slider 740 moves in the opposite direction of the first direction D1 under the action of the slider reset member (not shown in the figure) until the locking pin 730 is re-inserted into the first locking groove 1503a, and the trolley is locked in the unfolded state.

The trolley proposed in the second aspect of this invention has at least the following technical effects:

In the above-mentioned stroller, the linkage assembly 1500 is movably connected to the frame 100 and the seat assembly 200, and the backrest assembly 400 is movably connected to the seat assembly 200 through the linkage assembly 1500. When the frame 100 switches from the unfolded state to the folded state, the frame 100 can drive the backrest assembly 400 to fold towards the seat assembly 200 through the linkage assembly 1500. The overall folding structure is relatively simple and easy to use.

Third aspect

Referring to Figures 18 to 23, and especially Figures 18, 19, 25, and 26, a third aspect of the present invention provides a vehicle, which may be a child vehicle such as a stroller, comprising a frame 100, a seat assembly 200, a backrest assembly 400, and a linkage mechanism 500. The frame 100 includes two opposing side frames 101 and 102 and a push handle 120. The seat assembly 200 is mounted between the two side frames 101 and 102 and is configured to be movable relative to the side frames 101 and 102 in the longitudinal direction P, Q of the frame 100 between a first position and a second position. The backrest assembly 400 is mounted on the seat assembly 200 and is configured to be angle-adjustable relative to the seat assembly 200. The push arm 120 is hinged to the side frames 101 and 102 and configured to drive the seat assembly 200 to move relative to the side frames 101 and 102 in the longitudinal directions P and Q along the frame 100. A linkage mechanism 500 is disposed on one side of the seat assembly 200 and connected to the backrest assembly 400. The linkage mechanism 500 is configured such that the angle adjustment range of the backrest assembly 400 relative to the seat assembly 200 is the same when the seat assembly 200 is in a first position and a second position.

It should be understood that the same angle adjustment range between the backrest assembly 400 and the seat assembly 200 as described in this article means that when the angle between the backrest assembly 400 and the seat assembly 200 is not adjusted by the angle adjustment mechanism, the angle between the backrest assembly 400 and the seat assembly 200 remains basically the same or unchanged within a certain range when the seat assembly 200 moves from the first position to the second position or from the second position to the first position.

The frame 100 may include two seatposts 110 disposed on two side frames 101, 102. A seat assembly 200 may be disposed on the seatposts 110. In some embodiments, the side frame 101 includes a first foreleg support 161 and a first rear leg support 171. The first foreleg support 161 and the first rear leg support 171 are interconnected and form a generally triangular structure with respect to the ground. In some embodiments, the side frame 101 further includes a first armrest 132 connected to the first foreleg support 161 and/or the first rear leg support 171, the first armrest 132 being disposed generally parallel to the ground or slightly inclined relative to the ground. In some embodiments, the lateral frame 101 also includes an auxiliary frame 140, which is connected to the first armrest 132 and the seat assembly 200, respectively. In other embodiments, the auxiliary frame 140 may also be connected to the first rear foot support 171 and form a generally triangular structure with the first armrest 132 and the first rear foot support 171. The side frame 102 may have a left-right symmetrical arrangement with respect to the side frame 101, such as including a second front support rod 162, a second rear support rod 172, a second handrail 133 and another auxiliary frame 140 respectively arranged symmetrically with respect to the first front support rod 161, the first rear support rod 171, the first handrail 132 and the auxiliary frame 140.

The seat assembly 200 can be movably (e.g., slidably) mounted on the seatpost 110 along the longitudinal directions P and Q of the frame 100. In some embodiments, the seat assembly 200 includes a movable frame 220 and a seat bracket 230 mounted on the movable frame 220, the movable frame 220 being movably (e.g., slidably) mounted on the seatpost 110 along the longitudinal directions P and Q of the frame 100. In some embodiments, the movable frame 220 includes a sliding sleeve 221 (best seen in Figures 21 and 22), the sliding sleeve 221 being slidably fitted onto the seatpost 110 along the longitudinal direction of the frame 100. It is understood that the movable frame 220 can also be movably mounted on the seatpost 110 along the longitudinal direction of the frame 100 in other ways, such as by providing a groove.

The backrest assembly 400 may include a backrest tube 450 for supporting a backrest panel (not shown). The backrest assembly 400 may be mounted on the seat assembly 200 via the backrest tube 450. In some embodiments, the bottom of the backrest tube 450 is hinged to a movable frame 220, thereby allowing the bottom of the backrest tube 450 to slide relative to the seat post 110 with the movable frame 220. Referring to Figures 20 and 25, in some embodiments, the backrest assembly 400 includes a strap 430 (for clarity, the straps in other figures are omitted, for example, the straps are not shown in Figures 18 and 19, but the strollers in Figures 18 and 19 may be similar to those in Figure 25 with straps), the two ends of the strap 430 are respectively connected to the two side frames 101, 102, and the upper middle part of the backrest tube 450 is supported on the strap 430.

The push handle 120 is pivotable relative to the side frames 101 and 102, thereby allowing the stroller 10 to switch between a first use state (e.g., forward-facing use state, see Figure 18) and a second use state (e.g., rear-facing use state, see Figure 19). The push handle 120 may be located outside and pivoted to the side frames 101 and 102. In some embodiments, the push handle 120 is pivoted to the auxiliary frame 140 of the side frames 101 and 102. In some embodiments, the push handle 120 is pivoted to the side frames 101 and 102 (e.g., auxiliary frame 140) via a pivot shaft 630 (see Figure 21). The connecting shaft 630 can be inserted into the side frames 101, 102 (e.g., auxiliary frame 140). In other embodiments, the first use state can also be the reverse use state, and the second use state can also be the forward use state, and it is not limited thereto.

As shown in Figure 20, the pusher arm 120 can be connected to the seat assembly 200 via a drive assembly 600, for example, to the movable frame 220 of the seat assembly 200. The drive assembly 600 can be configured to convert the pivoting of the pusher arm 120 relative to the lateral frames 101, 102 into movement of the seat assembly 200 in the longitudinal direction of the frame 100, for example, converting the pivoting of the pusher arm 120 relative to the lateral frames 101, 102 into movement (e.g., sliding) of the movable frame 220 in the longitudinal direction of the frame 100 relative to the seat post 110.

In some embodiments, the drive assembly 600 is disposed inside the side frames 101, 102. In some embodiments, referring to Figures 20 and 21, the pusher arm 120 is connected to the drive assembly 600 via a pin 630 passing through the side frames 101, 102. In some embodiments, the drive assembly 600 is a linkage mechanism.

In some embodiments, as shown in Figures 20 to 24, the drive assembly 600 includes a first drive rod 610 and a second drive rod 620 disposed on the side of the movable frame 220 away from the lateral frames 101 and 102. The first end of the first drive rod 610 is connected to the pusher frame 120 via a pin 630. Specifically, one end of the pivot 630 is fixedly connected to the pusher frame 120, and the other end of the pivot 630 passes through the lateral frames 101 or 102 (e.g., through the auxiliary frame 140) and the seat tube 110 and is fixedly connected to the first end of the first drive rod 610. For example, square holes can be provided on the first ends of the pusher frame 120 and the first drive rod 610, and the two ends of the connecting shaft 630 can be square structures and can be locked in the square holes, thereby realizing the fixed connection between the connecting shaft 630 and the first ends of the pusher frame 120 and the first drive rod 610. However, the present invention is not limited to this. For example, the connecting shaft 630 can be connected to components such as the pusher frame 120 and the first drive rod 610 according to the connection method described with reference to Figures 3 and 4 in the first aspect of the present invention. The second end of the first drive rod 610 is connected to the first end of the second drive rod 620. For example, another hinge (not shown) may pass through the second end of the first drive rod 610 and the first end of the second drive rod 620, so that the second end of the first drive rod is hinged to the first end of the second drive rod and can pivot relative to the movable frame 220. The backrest tube 450 may also be hinged to the movable frame 220 via a hinge, and the backrest tube 450 may move synchronously with the movable frame 220 when the movable frame 220 moves in the longitudinal directions P and Q of the frame 100. The second end of the second drive rod 620 is connected to the seat assembly 200, for example, to the movable frame 220. When the pusher arm 120 pivots relative to the lateral frames 101 and 102, the pusher arm 120 can drive the first drive rod 610 to rotate via the pivot shaft 630, and drive the seat assembly 200 to move along the front-rear direction of the frame 100 via the second drive rod 620, for example, driving the movable frame 220 to move relative to the seat post 110 in the front-rear direction of the frame 100 (e.g., sliding). It is understood that the above description is only an example of the drive assembly 600. The drive assembly 600 can also adopt other configurations. For example, the first drive lever 610 and the second drive lever 620 can be set between the side frames 101, 102 and the seat tube 110. For example, the number of drive levers can be varied. For example, other drive mechanisms without linkages can also be adopted.

Please refer to Figures 18 and 19. In the stroller provided by this invention, when the user rotates the pusher arm 120, the pusher arm 120 drives the movable frame 220 to move relative to the seat post 110 in the front-rear direction of the frame 100 via the drive assembly 600. At this time, the bottom of the backrest tube 450 moves synchronously with the movable frame 220, thereby causing the angle of the backrest tube 450 relative to the seat assembly 200 to change.

The third aspect of the invention provides a linkage mechanism 500, which can be configured such that when the pusher arm 120 rotates relative to the side frames 101 and 102, the backrest assembly 400 moves relative to the side frames 101 and 102 along the front-rear direction of the frame 100 without changing its angle relative to the seat assembly 200. Specifically, the linkage mechanism 500 can be connected to the pusher frame 120 or the seat assembly 200 on the one hand, and to the strap 430 of the backrest assembly 400 on the other hand, so that when the pusher frame 120 rotates relative to the lateral frames 101 and 102, the upper middle part and the bottom of the backrest tube 450 are moved synchronously through the strap 430, so that the backrest tube 450 and the movable frame 220 move synchronously in the front-rear direction of the frame without rotating relative to the movable frame 220. It should be understood that the upper middle part of the backrest tube 450 mentioned in this article is relative to the bottom of the backrest tube 450, and refers to the position at a certain distance from the bottom of the backrest tube 450. The backrest assembly 400 is supported by the bottom of the backrest tube 450 connecting with the movable frame 220 and the middle part of the backrest tube 450 cooperating with the strap 430.

The following describes in detail the connecting mechanism 500 of the present invention in conjunction with the first, second and third embodiments.

Please refer to Figures 18-24. In the first embodiment, the linkage mechanism 500 is connected to the ends of the seat assembly 200 (e.g., the movable frame 220) and the strap 430, respectively, and is configured to drive the ends of the strap 430 to move synchronously with the seat assembly 200 when the seat assembly 200 moves along the front-rear direction of the frame 100. Since the upper middle part of the backrest tube 450 is supported on the strap 430, the upper middle part and the bottom of the backrest tube 450 move synchronously with the seat assembly 200 without changing the angle between the backrest tube 450 and the seat assembly 200.

Referring to Figures 20-24, the linkage mechanism 500 may include a linkage rod 510. A first end of the linkage rod 510 is connected to the seat assembly 200, for example, to the movable frame 220. A second end of the linkage rod 510 is movably mounted relative to the frame 100 in the rear-rear direction to the side frames 101, 102, and is fixedly connected to the end of the strap 430, such that when the seat assembly 200 moves relative to the side frames 101, 102 in the rear-rear direction of the frame 100, the first end of the linkage rod 510 drives the second end of the linkage rod 510, and thus drives the end of the strap 430 to move in the rear-rear directions P, Q, thereby driving the upper middle portion of the backrest tube 450 to move in the rear-rear directions P, Q. In this way, when the seat assembly 200 moves relative to the lateral frames 101 and 102 in the front-rear direction along the frame 100, the upper middle part and the bottom of the backrest tube 450 can move synchronously, so that it will not rotate relative to the seat assembly 200 and change its angle relative to the seat assembly 200.

Referring to Figure 21, the linkage 510 is disposed between the side frames 101, 102 and the seat assembly 200, for example, between the side frames 101, 102 and the movable frame 220. Specifically, the side frames 101, 102 are provided with first grooves 1303 extending along the front-rear directions P, Q of the frame, and the second end of the linkage 510 is slidably mounted to the first groove 1303. Furthermore, the first groove 1303 is disposed on the armrests 132, 133. In some embodiments, the length of the first groove 1303 is the same as the distance the seat assembly 200 moves from its first position to its second position. It is understandable that the length of the first slide 1303 may not be the same as the distance the seat assembly 200 moves from its first position to its second position. For example, the length of the first slide 1303 may be greater than that distance.

As shown in Figures 21 to 24, the first end of the linkage 510 is connected to the movable frame 220. Specifically, a first protrusion 512 is provided on the side of the first end of the linkage 510 facing the movable frame 220. The movable frame 220 is provided with a groove or through hole 214 for receiving the first protrusion 512 (see Figures 22 and 24). The first protrusion 512 cooperates with the groove or through hole 214 to connect the linkage 510 to the movable frame 220. In some embodiments, the movable frame 220 is provided with a through hole 214 for receiving the first protrusion 512, and a second protrusion 212 extends from the through hole 214 in a direction away from the linkage 510 (see Figure 24). The first protrusion 512 passes through the second protrusion 212. In some embodiments, referring to Figures 23 and 24, the movable frame 220 may have a recess 213 on the side facing the linkage 510, corresponding to the position of the groove or through hole 214. The first end of the linkage 510 may be received in the recess 213, which may restrict the first end of the linkage 510 from rotating counterclockwise relative to the movable frame 220. In some embodiments, the linkage mechanism 500 further includes an elastic element 520 (e.g., a torsion spring), one end of which is encircled around the second protrusion 212, and the other end of which is hooked onto the side of the linkage 510 away from the movable frame 220, thereby restricting the first end of the linkage 510 from rotating clockwise relative to the movable frame 220. Specifically, when the pusher frame 120 rotates from the first use state (see Figure 18) to the second use state (see Figure 19), the recess 213 can restrict the counterclockwise rotation of the first end of the linkage rod 510, thereby driving the second end of the linkage rod 510 to slide together with the first end in the first direction P (see Figure 24); while when the pusher frame 120 rotates from the second use state (see Figure 19) to the first use state (see Figure 18), the elastic member 520 can restrict the clockwise rotation of the first end of the linkage rod 510, thereby driving the second end of the linkage rod 510 to slide together with the first end in the second direction Q (see Figure 24).

The movable frame 220 may include a sliding sleeve 221 and a mounting portion 224. The sliding sleeve 221 is sleeved on the outside of the seat tube 110 and can move along the seat tube 110. The mounting portion 224 is provided on the upper side of the sliding sleeve 221. A groove or through hole 214, a recess 213, and a second protrusion 212 may all be provided on the mounting portion 224.

In the first embodiment provided by the present invention, when the user rotates the pusher arm 120 to switch between a first use state (see FIG. 18) and a second use state (see FIG. 19), the pusher arm 120 drives the movable frame 220 of the seat assembly 200 to move (e.g., slide) along the front-rear direction of the frame 100 on the seat tube 110 via the drive assembly 600. The bottom of the backrest tube 450 of the backrest assembly 400 moves along the front-rear direction of the frame 100 with the movable frame 220. At the same time, the movable frame 220 drives the entire linkage 510 (i.e., the first end and the second end) to move along the front-rear direction of the frame 100, thereby driving the end of the strap 430 and thus the upper middle part of the backrest tube 450 to move along the front-rear direction of the frame 100 with the seat assembly 200. In this way, the upper middle part and the bottom of the backrest tube 450 move synchronously with the seat assembly 200, so as not to change the angle of the backrest assembly 400 relative to the seat assembly 200.

Referring to Figures 25 to 32, in the second embodiment, the linkage mechanism 500 is connected to the ends of the pusher arm 120 and the harness 430, respectively, and is configured to cause the ends of the harness 430 to move synchronously with the seat assembly 200 when the pusher arm 120 pivots relative to the frame 100.

Specifically, referring to Figures 27 and 28, the linkage mechanism 500 includes a transmission component 530 and a sliding component 540. The sliding component 540 is slidably disposed on the side frames 101 and 102 along the longitudinal directions P and Q of the frame 100 and is connected to the end of the strap 430. The transmission component 530 is connected to the pivot shaft 630 and the sliding component 540 respectively, which are disposed in the side frames 101 and 102 (e.g., auxiliary frame 140). The transmission assembly 530 is configured to convert the pivot of the pusher arm 120 relative to the lateral frames 101, 102 (i.e., the rotation of the pivot shaft 630) into the sliding of the slide member 540 along the front-rear direction of the frame 100, so as to drive the end of the strap 430 and thus drive the upper middle part of the backrest tube 450 and the bottom of the backrest tube 450 to move synchronously.

Specifically, the transmission component 530 may include a coupling gear 531, one or more driven gears 532, and an output gear 533. The coupling gear 531 may be connected to the pivot shaft 630 via a traction member 550 and a drive wheel 560. Specifically, the drive wheel 560 is fixedly connected to the pivot shaft 630 and can rotate with the pivot shaft 630; for example, the drive wheel 560 may be sleeved on the pivot shaft 630. Referring to Figure 28, the traction member 550 is connected to both the drive wheel 560 and the coupling gear 531. When the drive wheel 560 rotates, it can drive the coupling gear 531 to rotate via the traction member 550. For example, the traction member 550 can be a cable, with one end of the cable fixed at a first position on the linkage gear 531, and the other end of the cable extending to the drive wheel 560, passing over the drive wheel 560, and extending back to the linkage gear 531 and fixed at a second position opposite to the first position. The portion of the cable wound on the drive wheel 560 is also fixed to a certain position on the drive wheel 560 (e.g., position R as shown in Figure 28). When the drive wheel 560 rotates, the lengths of the cable portions on both sides of the drive wheel 560 and the linkage gear 531 change, thereby causing the linkage gear 531 to rotate as well. The linkage gear 531 meshes with one or more driven gears 532, which in turn mesh with the output gear 533. The output gear 533 meshes with the sliding member 540, thereby enabling the rotation of the linkage gear 531 to drive the sliding member 540 to move along the front-rear direction of the frame 100. The sliding member 540 may be provided with teeth 541 (see Figure 29) to facilitate meshing with the output gear 533. Since the rotation angle of the pivot shaft 630 is small, by setting one or more driven gears 532 and making the teeth of the driven gears 532 smaller than the teeth of the coupling gears 531, the small angle of rotation of the coupling gears 531 can be amplified into a larger angle of rotation of the output gears 533, so that the slider 540 can move a larger distance. It should be understood that the above detailed description is merely an example, and those skilled in the art can make several adjustments, changes, and improvements. For example, the drive wheel 560 can be omitted, and the traction member 550 can be connected to the pivot shaft 630 and the coupling gear 531 respectively. When the pivot shaft 630 rotates, it can drive the coupling gear 531 to rotate through the traction member 550. For example, in appropriate cases, one or more driven gears 532 or output gears 533 can be omitted, and the coupling gear 531 can directly mesh with the sliding member 540. As another example, the number of driven gears 532 can be adjusted according to the actual situation.

In some embodiments, the linkage mechanism 500 is disposed inside the side frames 101, 102, so that the linkage mechanism 500 is not visible to the user. In some embodiments, the side frames 101, 102 have one or more cavities, and the transmission assembly 530, the sliding member 540, the traction member 550 and the drive wheel 560 are all disposed within one or more cavities of the side frames 101, 102.

In some embodiments, the transmission assembly 530 (including the coupling gear 531, one or more driven gears 532, and output gear 533) and the sliding member 540 are both disposed in the cavities within the handrails 132 and 133. The drive wheel 560 is disposed in the cavity of the auxiliary frame 140 and is connected to the coupling gear 531 via the traction member 550.

As shown in Figures 30-32, the sliding member 540 may include a sliding portion 543 and a connecting portion 542, and a tooth 541 may be disposed on the connecting portion 542. The connecting portion 542 is used to mesh with the output gear 533. When the driving gear 531 rotates, the driven gear 532 and the output gear 533 can drive the connecting portion 542, and thus drive the sliding portion 543 to slide in the front-rear direction of the frame 100.

As shown in Figures 29 to 32, the stroller also includes a mounting base 1700 disposed in the cavities within the armrests 132 and 133. The mounting base 1700 includes a shell 1710, and a baffle 1711 is disposed on the inner wall of the shell 1710, dividing the shell 1710 into a first accommodating space 1710A and a second accommodating space 1710B. The sliding portion 543 of the slider 540 can be disposed in the first accommodating space 1710A and slidably disposed on the baffle 1711. Referring to Figure 30, a first limiting portion 1712 and a second limiting portion 1713 can be provided on both sides of the baffle 1711 to limit the extreme sliding position of the sliding portion 543. The distance between the first limiting portion 1712 and the second limiting portion 1713 along the front-rear direction of the frame 100 can be the same as the distance the seat assembly 200 moves along the front-rear direction of the frame 100 between its first and second positions. A linkage gear 531, one or more driven gears 532, and an output gear 533 can be disposed in the second receiving space 1710B, at least one of which engages with the connecting portion 542 of the slide member 540. The inner wall of the baffle 1711 can be provided with one or more protrusions (as shown in FIG. 31) in the second receiving space 1710B for mounting the linkage gear 531, one or more driven gears 532, and the output gear 533.

As shown in Figures 30 to 32, the mounting base 1700 may further include a cover 1720, which can be mounted to the housing 1710 and together with the housing 1710 defines a second receiving space 1710B. A linkage gear 531, one or more driven gears 532, and an output gear 533 may be disposed between the cover 1720 and the housing 1710. One end of the connecting portion 542 of the slider 540 is provided with teeth 541 and can extend across the upper end of the cover 1720 and outward from the cover 1720. An opening 1722 (see Figure 31) may be provided on the outer side of the cover 1720, through which the linkage gear 531, one or more driven gears 532 or output gears 533 can engage with the connecting part 542 of the sliding member 540.

Specifically, as shown in Figure 31, a step 1721 may be provided on the outer side of the cover 1720, and one end of the connecting portion 542 of the slider 540 is provided with teeth 541, which can extend to the step 1721. An opening may be provided on the step 1721, through which the teeth of the driving gear 531, one or more driven gears 532 or output gears 533 can extend to mesh with the teeth 541 of the slider 540.

In some embodiments, referring to Figure 25, the side frames 101, 102 (e.g., armrests 132, 133) are provided with second grooves 1304 extending along the longitudinal direction P, Q of the frame 100. The end of the strap 430 can pass through the second groove 1304 and be fixedly connected to a sliding member 540 disposed in the cavity of the side frames 101, 102. The end of the strap 430 can slide in the second groove 1304. When the sliding member 540 slides along the longitudinal direction of the frame 100, it can drive the end of the strap 430 to move along the longitudinal direction of the frame 100 in the second groove 1304. The length of the second groove 1304 along the longitudinal direction of the frame 100 can be the same as the distance that the seat assembly 200 moves along the longitudinal direction of the frame 100 between its first and second positions. It is understood that in other embodiments, the length of the second slide 1304 along the front-rear direction of the frame 100 may also differ from the distance by which the seat assembly 200 moves along the front-rear direction of the frame 100 between its first and second positions, and is not limited thereto.

In some embodiments, referring to FIG31, the slide 540 may be provided with a groove or through hole 544 for connection with the end of the strap 430.

In the second embodiment provided by this invention, when the user rotates the pusher arm 120 to switch between a first and a second use state, the pivot shaft 630 rotates with the pusher arm 120, thereby driving the drive wheel 560 to rotate. The rotation of the drive wheel 560 drives the linkage gear 531 to rotate via the traction member 550, thereby driving the sliding member 540 to slide via one or more driven gears 532 and output gears 533, and thus driving the end of the strap 430 to move along the front-rear direction of the frame 100, and causing the upper part of the backrest tube 450 and the bottom of the backrest tube 450 to move synchronously to prevent changes in the angle between the backrest assembly 400 and the seat assembly 200.

Referring to Figures 33 and 34, the difference between the third embodiment and the first and second embodiments lies in that the linkage mechanism 500 includes a guide 580 and a connector 590. The guide 580 is attached to the frame 100, for example, to the side frames 101 and 102, or to the armrests 132 and 133 of the side frames 101 and 102. The end of the strap 430 passes through the guide 580 and connects to the connector 590. The connector 590 is connected to the seat assembly 200 and can move with the seat assembly 200 in the front-rear directions P and Q along the frame 100, thereby driving the backrest tube 450 to move synchronously with the seat assembly 200 via the strap 430.

The guide member 580 supports the end of the strap 430, allowing the backrest tube 450 to be supported on the middle portion of the strap 430. When the seat assembly 200 moves along the longitudinal direction P and Q of the frame 100, the end of the strap 430 moves via the connector 590, causing a change in the length of the portion of the strap 430 between the guide member 580 and the backrest tube 450, which in turn causes the upper middle portion of the backrest tube 450 to move along the longitudinal direction P and Q of the frame 100. Specifically, when the seat assembly 200 moves forward in the P direction, the length of the portion of the strap 430 between the guide member 580 and the backrest tube 450 shortens, causing the upper middle portion of the backrest tube 450 to move forward. When the seat assembly 200 moves backward in the Q direction, the length of the strap 430 between the guide 580 and the backrest tube 450 increases, thereby causing the upper middle part of the backrest tube 450 to move backward.

The guide 580 is positioned such that after the end of the strap 430 passes over it, the upper-middle portion of the backrest tube 450 can be supported on the strap 430. For example, the guide 580 is typically positioned above the bottom of the backrest tube 450, for example, attached to the side frames 101, 102, or to the handlebars 132, 133 of the side frames 101, 102. The guide 580 may be, for example, a smooth cylindrical rod, allowing the portion of the strap 430 passing over the guide 580 to slide on it. The guide 580 may also be, for example, a roller, to facilitate the sliding of the portion of the strap 430 over the guide 580. It is understood that the guide 580 is not limited to this and other configurations can be used, as long as it can support the portion of the strap 430 passing through it and allow the portion of the strap 430 to slide on it. The number of guides 580 can be one or more, depending on actual needs. In some embodiments, the connector 590 can be a separate connector, such as a cable, which connects to both the end of the seat assembly 200 (e.g., the movable frame 220 or the seat) and the end of the strap 430. In some embodiments, the connector 590 is part of the strap 430, or the connector 590 can be integrally formed with the strap 430; in other words, the end of the strap 430 can connect directly to the seat assembly 200 after passing through the guide 580. It is understandable that connector 590 is not limited to this and other configurations can be used, as long as the above functions can be achieved.

In the third embodiment of the present invention, when the seat assembly 200 moves along the front-rear direction of the frame 100, the end of the strap 430 moves via the connector 590, thereby causing a change in the length of the portion of the strap 430 between the guide 580 and the backrest tube 450, which in turn causes the upper middle part of the backrest tube 450 to move along the front-rear direction of the frame 100. Since the upper middle part of the backrest tube 450 can move synchronously with the bottom of the backrest tube 450, the angle between the backrest assembly 400 and the seat assembly 200 is prevented from changing.

Fourth aspect

Figures 35 and 36 show perspective views of a vehicle 1000 provided according to a fourth aspect of the present invention, the vehicle 1000 having a handrail mounting unit 300, which will be described in conjunction with the following description of the vehicle 1000.

In the embodiment shown in Figure 35, the vehicle 1000 is illustrated by way of example a child vehicle such as a stroller. It is understood that in some alternative embodiments, the type of vehicle 1000 is not limited to a stroller, but may be, for example, a high chair, a high chair, a tricycle, etc.

Referring to Figure 35, the child vehicle 1000 includes a frame 100 and a seat assembly 200. The frame 100 may include a push-armrest 120, an armrest 130, a front leg support 160, a rear leg support 170, etc. The frame 100 is generally symmetrical. The frame 100 also includes two symmetrically arranged seat posts 110 for mounting the seat assembly 200. The seat assembly 200 includes a seat frame 230 mounted between the two seat posts 110. In some embodiments, the seat frame 230 may be padded to provide a comfortable seat for the child. The armrest 130 includes two symmetrically arranged armrests 132, 133 located above the seat assembly 200, thereby limiting the child's lateral range of motion. The armrest frame 130 also includes an armrest body 131, which is disposed above the seat assembly 200 and arranged horizontally. The left and right ends of the armrest body 131 are detachably connected to corresponding armrest bars 132 and 133 via armrest mounting units 300 provided in the fourth aspect of the invention. Referring to Figure 35, when the armrest body 131 is connected between the two armrest bars 132 and 133, the armrest body 131 can limit the child's forward range of movement. Referring to Figure 36, when the armrest body 131 is separated from the armrest bars 132 and 133, the armrest body 131 no longer restricts the child's forward movement, thus facilitating the child to sit on or leave the seat assembly 200 from outside the child vehicle.

In some alternative embodiments, the handrail body 131 may be detachably connected at only one end to the corresponding handrail bar 132, 133 via the handrail mounting unit 300 provided in the fourth aspect of the invention, and the other end of the handrail body 131 may be detachably or non-detachably connected to the corresponding handrail bar 132, 133 via other suitable structures (e.g., hinges). For example, in some alternative embodiments, the other end of the handrail body 131 is hinged to the corresponding handrail bar 132, 133 via a hinge, which may be perpendicular to or inclined relative to the horizontal plane. When one end of the armrest body 131 is separated from the corresponding armrest bars 132 and 133, the other end of the armrest body 131 can swing around the pivot in the left and right directions, thereby relieving the restraint on the child sitting on the seat assembly 200, and the child can easily get off the seat assembly 200.

Referring to Figures 35 to 38, the handrail mounting unit 300 provided in the fourth aspect of the present invention includes a first connecting seat 310, a first magnetic member 330, a second connecting seat 320, and a second magnetic member 348. The first connecting seat 310 is connected to the handrail bars 132 and 133, and the second connecting seat 320 is connected to the handrail body 131. Of course, in some alternative embodiments, the first connecting seat 310 may be connected to the handrail body 131, while the second connecting seat 320 is connected to the handrail bars 132 and 133. The first connecting seat 310 is provided with a latching part 327. The first magnetic member 330 is provided in the first connecting seat 310. The second connecting seat 320 is provided with a locking member 341. The second magnetic member 348 is provided in the second connecting seat 320.

When the handrail body 131 needs to be installed onto the handrails 132 and 133, the first connecting seat 310 and the second connecting seat 320 are detachably connected by the detachable engagement of the engaging member 341 and the receiving part 327, and by the magnetic attraction of the first magnetic member 330 and the second magnetic member 348. When the handrail body 131 needs to be removed from the handrails 132 and 133, the first connecting seat 310 and the second connecting seat 320 can be separated after releasing the engagement of the engaging member 341 and the receiving part 327. The handrail installation unit 300 provided in this embodiment of the invention has a relatively simple structure, and the engagement of the engaging member 341 and the receiving part 327, as well as the magnetic attraction of the first magnetic member 330 and the second magnetic member 348, provide double protection for the connection of the first connecting seat 310 and the second connecting seat 320.

In some embodiments, the first magnetic attractor 330 and the second magnetic attractor 348 may both be made of permanent magnets, or one of the first magnetic attractor 330 and the second magnetic attractor 348 may be made of permanent magnets and the other may be made of a magnetic material that can be attracted by permanent magnets.

Figures 39 and 40 show exploded views of exemplary embodiments of the first connector 310. In some embodiments, the first connector 310 includes a connector body 3101 and a mounting base 370. The connector body 3101 is connected to the handrails 132, 133. More specifically, the connector body 3101 may be mounted on or integrally formed with the handrails 132, 133. The mounting base 370 is mounted on the connector body 3101 by a fastening mechanism 376, and a latching portion 327 is disposed on the mounting base 370 and includes at least one engaging slot 312 for removably engaging with an engaging member 341. The engaging member 341, for example, has at least one engaging portion 34111 protruding into the engaging groove 312 (see the description of Figures 41 and 42 below), which is used to detachably engage with the engaging groove 312. By providing the engaging groove 312 on the mounting base 370, which is mounted on the connecting body 3101 by means of the fastening mechanism 376, the connecting body 3101 with the same structure can be connected to different second connecting seats 320 by assembling different mounting seats 370, and thus matched with different models of handrail bodies 131, thereby effectively improving the versatility of the first connecting seat 310. In some embodiments, the mounting base 370 can be detachably mounted on the outer surface of the connecting body 3101 via a fastening mechanism 376, so that the mounting base 370 can be easily mounted on the connecting body 3101. In some embodiments, the mounting base 370 and the connecting body 3101 can be, for example, integrally molded parts.

Figures 39 and 40 illustrate an exemplary embodiment of the fastening mechanism 376. The outer surface 3102 of the connecting body 3101 is provided with a locking hole 3106 and a mounting hole 3107. The mounting base 370 has a flexible arm 3761 and a connecting hole 377 at opposite ends. The flexible arm 3761 engages with the locking hole 3106, and a fastener (e.g., a screw) 3762 passes through the connecting hole 377 and connects to the mounting hole 3107. The fastening mechanism 376 includes the flexible arm 3761 and the fastener 3762. Of course, the implementation of the fastening mechanism 376 is not limited to the above examples. For example, in some alternative embodiments, the fastening mechanism 376 may include at least two fasteners (e.g., screws) by which the mounting base 370 is non-rotatably mounted on the connecting body 3101.

Referring to Figure 39, in some embodiments, the outer surface 3102 of the connecting body 3101 has a positioning groove 3103, in which the mounting base 370 is non-rotatably mounted. The positioning groove 3103 is, for example, a non-circular groove, and the portion of the mounting base 370 located within the positioning groove 3103, for example, matches the shape of the positioning groove 3103. In some embodiments, the positioning groove 3103 is, for example, a U-shaped groove, having a limiting bottom 3104 and an opening 3109 opposite to the limiting bottom 3104. A locking hole 3106 is located near the limiting bottom 3104, and a mounting hole 3107 is located near the opening 3109. A first end of the mounting base 370 abuts against the limiting bottom 3104, and an elastic arm 3761 extends outward from the first end of the mounting base 370 to engage with the locking hole 3106. The second end of the mounting base 370 is near the opening 3109 and has a connecting hole 377, with a locking groove 312 located in the middle of the mounting base 370. In some embodiments not shown, the mounting base 370 may be mounted on the connecting body 3101, for example, via a pivot (not shown), which may be formed, for example, by a bolt, and may serve as a fastening mechanism for mounting the mounting base 370 to the body 3101, allowing the mounting base 370 to rotate relative to the body 3101. It is understood that the arrangement of the pivot should not affect the engagement of the locking groove 312 with the locking member 341, nor the arrangement of the first magnetic member 330 and its magnetic attraction with the second magnetic member 348.

Referring to Figures 39 and 40, in some embodiments, a countersunk head 3108 may be provided on the connecting body 3101 corresponding to the mounting hole 3107, and a boss 378 may be provided on the mounting base 370 corresponding to the connecting hole 377. While the boss 378 and the countersunk head 3108 mate with each other, the connecting hole 377 and the mounting hole 3107 are aligned, facilitating the installation of the fastener 3762. Of course, in some alternative embodiments, the positions of the countersunk head 3108 and the boss 378 on the connecting body 3101 and the mounting base 370 can be interchanged.

Referring to Figure 39, in some embodiments, the card-dispensing portion 327 includes, for example, a protrusion 371, on which an engaging groove 312 is disposed. Referring to Figure 37, the engaging member 341 includes, for example, at least one elastic arm 3411 located within the second connecting seat 320, each elastic arm 3411 having the aforementioned engaging portion 34111. The protrusion 371 of the card-dispensing portion 327 is adapted to extend into the second connecting seat 320, and the engaging groove 312 follows the protrusion 371 into the second connecting seat 320 to engage with the engaging portion 34111 of the elastic arm 3411, thereby connecting the second connecting seat 320 and the first connecting seat 310. At this time, the first magnetic member 330 and the second magnetic member 348 approach each other to achieve the desired magnetic attraction position.

Referring to Figures 38 to 40, an exemplary mounting method of the first magnetic member 330 is also shown in this embodiment. Specifically, the mounting base 370 has a receiving cavity 3710, the opening of which faces the connecting body 3101 and can be covered by the connecting body 3101, and the bottom of the receiving cavity 3710 extends into the protrusion 371. The first magnetic member 330 is mounted on the bottom of the receiving cavity 3710 through the opening of the receiving cavity 3710, so as to allow the first magnetic member 330 to be as close as possible to the second magnetic member 348 of the second connecting base 320. The first magnetic member 330 located in the receiving cavity 3710 will not detach from the receiving cavity 3710 due to the obstruction of the connecting body 3101.

Referring to Figures 38 to 40, in some embodiments, the outer surface 3102 of the connecting body 3101 may also be provided with a positioning post 3105. For example, the positioning post 3105 is disposed in the groove wall of the positioning groove 3103, and the positioning post 3105 extends into the receiving cavity 3710 through the opening of the receiving cavity 3710. The cooperation between the positioning post 3105 and the receiving cavity 3710 can improve the mechanical properties of the mounting base 370. In some embodiments, the positioning post 3105 can abut against the first magnetic member 330 to prevent the first magnetic member 330 from shaking in the receiving cavity 3710.

Of course, the implementation of the first magnetic member 330 is not limited to the examples described above. For example, in some alternative embodiments, the first magnetic member 330 is integrated with the mounting base 370 by overmolding. In other alternative embodiments, at least a portion of the mounting base 370 (e.g., protrusion 371) may be made of magnetic material and serve as the first magnetic member 330.

Figures 41 and 42 show exploded views of an exemplary embodiment of the second connector 320. In some embodiments, the second connector 320 has a receiving space 323 and an insertion hole 3222 communicating with the receiving space 323. A second magnetic member 348 and a locking member 341 are, for example, installed within the receiving space 323. The insertion hole 3222 is used for inserting or removing a card portion 327 into the receiving space 323. As previously described, the engaging member 341 includes, for example, at least one elastic arm 3411 located in the receiving space 323. The engaging member 341 is detachably engaged with the engaging groove 312 of the card-dispensing part 327 entering the receiving space 323 via the engaging portion 34111 of the elastic arm 3411, so as to detachably connect the first connecting seat 310 and the second connecting seat 320, and to place the first magnetic member 330 and the second magnetic member 348 in the desired magnetic attraction position. Referring to FIG41, the card-dispensing part 327 moves relative to the insertion hole 3222 in the insertion direction T, so that the card-dispensing part 327 enters or leaves the receiving space 323 through the insertion hole 3222.

Figures 41 and 42 illustrate an exemplary embodiment of mounting the second magnetic member 348 and the engaging member 341 into the receiving space 323. The second connector 320 is provided with a mounting hole 3231 communicating with the receiving space 323. The mounting hole 3231 and the insertion hole 3222 are located on different surfaces of the second connector 320, for example, on two generally perpendicular or intersecting surfaces of the second connector 320. The second magnetic member 348 and the engaging member 341 are mounted on a support 349, which is inserted into the receiving space 323 through the mounting hole 3231 and secured to the second connector 320 by a fastener 3492. Fastener 3492 is, for example, a screw, which passes through hole 3229 on second connector 320 and connects to hole 3498 on support 349. Of course, in other embodiments, second magnetic member 348 and engaging member 341 can be mounted on second connector 320 by other suitable structures.

Figures 41 and 42 illustrate an exemplary embodiment of the second magnetic member 348. Specifically, the support 349 is provided with a boss 3495 protruding toward the insertion hole 3222. The boss 3495 forms a receiving cavity 34950. Referring to Figure 38, the receiving cavity 34950 has a bottom 34951 and an opening 34952, with the bottom 34951 closer to the insertion hole 3222 than the opening 34952. The second magnetic member 348 is received in the bottom 34951 of the receiving cavity 34950 to allow the second magnetic member 348 to be as close as possible to the first magnetic member 330. The opening 34952 of the receiving cavity 34950 can be limited by the second connector 320 to prevent the second magnetic member 348 from accidentally dislodging from the receiving cavity 34950. Of course, the implementation of the second magnetic member 348 is not limited to the above examples. In some alternative embodiments, the second magnetic member 348 can be integrated with the support 349 by overmolding, or at least a portion of the support 349 (e.g., the boss 3495) can be made of magnetic material and serve as the second magnetic member 348.

Figures 41 and 42 illustrate exemplary embodiments of the engaging member 341. The engaging member 341 may include two elastic arms 3411, the first ends of which are connected to each other, for example, by a fixing part 3412 fixed to a support 349. In some alternative embodiments, the first ends of the two elastic arms 3411 are separate from each other and respectively fixed to the support 349. The second ends of the two elastic arms 3411 face each other, and the two elastic arms 3411 are used to hold the engaging groove 312.

It is understood that during the process of the card-dispensing part 327 entering the receiving space 323 through the insertion hole 3222, when the card-dispensing part 327 abuts against the two elastic arms 3411, the two elastic arms 3411 can undergo elastic deformation and open to allow the card-dispensing part 327 to continue moving into the receiving space 323. When the engaging part 34111 of the two elastic arms 3411 is opposite to the engaging groove 312, the two elastic arms 3411 automatically reset and engage with the engaging groove 312 through the engaging part 34111. When it is necessary to release the engagement of the locking member 341 and the card-attaching part 327, force is applied to the two elastic arms 3411 to open them, so that the locking part 34111 moves away from the locking groove 312, and then the card-attaching part 327 can be removed from the insertion hole 3222.

Referring to Figures 41 and 42, the fixing part 3412 is connected to the support 349, for example, via a mounting post 3497. In some embodiments, the fixing part 3412 has, for example, a hole 34120, and the mounting post 3497 is disposed on the support 349, the mounting post 3497 being for passing through the hole 34120. The support 349 may also be provided with a spacer 3491, which is located near the first ends of the two elastic arms 3411 and spaced apart from the mounting post 3497. When the engaging part 327 is not in the receiving space 323, the two elastic arms 3411 can abut against the spacer 3491 located between them, thus positioning the engaging member 341 and preventing the engaging member 341 from rotating around the mounting post 3497 and failing to engage with the engaging groove 312.

Referring again to Figure 39, in some embodiments, the engaging groove 312 may include an annular groove disposed on the outer peripheral wall of the protrusion 371. Referring to Figure 42, the engaging member 341 includes two generally arcuate elastic arms 3411, which are disposed opposite to each other and form a space 340 for accommodating the protrusion 371. When the engaging member 341 and the engaging groove 312 are engaged, the two elastic arms 3411 hold the engaging groove 312. Referring to Figures 41 and 42, each elastic arm 3411 has an engaging portion 34111 protruding toward the space 340, and each engaging portion 34111 is, for example, an arcuate tab. The engaging part 34111 is adapted to be inserted into the engaging slot 312 and engage with the engaging slot 312, thereby preventing the card dispensing part 327 from being pulled out of the insertion hole 3222.

Of course, the implementation of the engaging member 341 and the engaging groove 312 is not limited to the examples described above. For example, in some alternative embodiments, the engaging groove 312 may include at least one groove formed on the outer peripheral wall of the protrusion 371. The engaging member 341 may include at least one elastic arm 3411, and the engaging portion 34111 on each elastic arm 3411 is, for example, a hook, and each hook is adapted to be inserted into a corresponding groove. The number and structure of the elastic arms 3411 and the engaging groove 312 can be set as needed.

Referring again to Figure 36, the first connector 310 has a first mating surface 38 disposed on at least one of the body 3101 and the mounting base 370. The second connector 320 has a second mating surface 3220. When the first connector 310 and the second connector 320 are connected, the first mating surface 38 and the second mating surface 3220 abut against each other. A protrusion 371 protrudes opposite the first mating surface 38, and an insertion hole 3222 is located within the area defined by the second mating surface 3220.

In the embodiment shown in Figure 36, both the first mating surface 38 and the second mating surface 3220 are vertical surfaces (e.g., perpendicular to the horizontal plane), and the insertion/removal direction T of the card-attaching part 327 is, for example, parallel to the horizontal plane. The second connecting seats 320 at both ends of the handrail body 131 are located between the first connecting seats 310 of the left and right handrail bars 132 and 133. To facilitate the engagement of the first connecting seats 310 and the second connecting seats 320, the second connecting seat 320 is hinged to the handrail body 131 via a pivot 325, the axis of which is perpendicular to the insertion/removal direction T.

The following describes the assembly and disassembly of the first connector 310 and the second connector 320 with reference to Figure 36.

When it is necessary to install the handrail body 131 onto the handrails 132 and 133, first rotate the second connecting seats 320 at both ends of the handrail body 131 toward each other, and then move both ends of the handrail body 131 between the left and right handrails 132 and 133. When the insertion hole 3222 is aligned with the protrusion 371, rotate the second connecting seats 320 at both ends of the handrail body 131 toward each other, and insert the protrusion 371 and the engaging groove 312 into the insertion hole 3222, and then the elastic arm 3411 of the engaging member 341 engages with the engaging groove 312 on the protrusion 371.

When it is necessary to separate the handrail body 131 from each handrail bar 132, 133, release the engagement relationship between the locking groove 312 and the elastic arm 3411, rotate each second connecting seat 320 around the pivot 325 so that the protrusion 371 exits the insertion hole 3222, and then the handrail body 131 can be removed.

To prevent the handrail body 131 from rotating vertically relative to the individual handrails 132 and 133, referring to Figures 38, 39, and 41, in some embodiments, the mounting base 370 has an anti-rotation plate 372 that protrudes relative to the first mating surface 38. The anti-rotation plate 372 and the insertion hole 3222 can be fitted together by any non-circular shape, so that the anti-rotation plate 372 is fitted into the insertion hole 3222 without relative rotation, thereby engaging with the second connecting base 320 without relative rotation. For example, in some embodiments, the insertion hole 3222 is a U-shaped hole, and the anti-rotation plate 372 correspondingly has a U-shaped outer contour. In some alternative embodiments, the insertion hole 3222 can be a flat hole or a polygonal hole, and the shape of the anti-rotation table 372 can be adapted to the shape of the insertion hole 3222. Referring to Figure 39, in some embodiments, the protrusion 371 protrudes from the end face of the anti-rotation table 372 and is located within the area defined by the end face of the anti-rotation table 372. The protrusion 371 extends into the receiving space 323 with a smaller structure, which is beneficial to the miniaturization of the engaging member 341 structure.

In some embodiments, to facilitate the disengagement of the engaging member 341 and the engaging groove 312, the second connector 320 may also be equipped with a release member 342 and a spring-loaded return member 345. More specifically, the release member 342 is operatively connected to the engaging member 341 for pushing the elastic arm 3411 to disengage from the engaging groove 312. The spring-loaded return member 345 is used to drive the release member 342 to return to its original position.

Referring to Figures 41 and 42, exemplary embodiments of the release member 342 are illustrated. In some embodiments, the second connector 320 is provided with a mounting hole 3232 opposite to a mounting hole 3231. The release member 342 has an operating portion 3423, a shoulder 3429, and at least one pushing portion 3421. After the release member 342 enters the receiving space 323 through the mounting hole 3231, the operating portion 3423 extends from the mounting hole 3232 and slides into the mounting hole 3232. The shoulder 3429 abuts against the inner wall of the second connector 320 to prevent the release member 342 from falling out of the mounting hole 3232. The number of pushing portions 3421 is the same as the number of elastic arms 3411. Each elastic arm 3411 is provided with an abutment portion 3413, and each pushing portion 3421 abuts against a corresponding abutment portion 3413. In some embodiments, the pushing portion 3421 may be provided with a pushing ramp 3421a, and the abutment portion 3413 may be a column extending from the elastic arm 3411. The pushing portion 3421 abuts against the abutment portion 3413 via the pushing ramp 3421a. When the release member 342 is moved by the release force, the pushing ramp 3421a pushes the elastic arm 3411 away from the engaging groove 312, thereby disengaging the engaging portion 34111 from the engaging groove 312. Of course, in other embodiments, the pushing part 3421 and the abutting part 3413 may have other embodiments and are not limited to the examples mentioned above. For example, in some alternative embodiments, a slope may be provided on the abutting part 3413, and the pushing part 3421 may be, for example, a protrusion that abuts against the slope of the abutting part 3413.

Referring to Figure 43, in some embodiments, at least one guide surface 3496 may be provided within the accommodating space 323, corresponding to at least one abutment portion 3413. The guide surface 3496 may be formed on the sidewall of the boss 3495. Each push portion 3421 is sandwiched between the corresponding guide surface 3496 and the abutment portion 3413, and each push portion 3421 has a sliding surface 3421c that slides in cooperation with the corresponding guide surface 3496. The guide surface 3496 and the sliding surface 3421c are, for example, parallel to the direction of movement of the unlocking member 342. When the pushing part 3421 pushes the abutting part 3413, the guide surface 3496 supports the pushing part 3421. This can prevent the pushing part 3421 from elastically deforming when it comes into contact with the abutting part 3413 and thus failing to push the abutting part 3413 properly, which would prevent the engaging part 34111 from successfully disengaging from the engaging groove 312.

Figures 41 and 42 illustrate exemplary embodiments of the elastic reset member 345. In some embodiments, the elastic reset member 345 is, for example, a spring, and is mounted between the release member 342 and the support 349. Referring to Figure 41, in some embodiments, a limit block 3493 may be provided on the support 349, and a positioning post 3494 is provided on the limit block 3493. One end of the elastic reset member 345 abuts against the limit block 3493 and is sleeved on the positioning post 3494. The other end of the elastic reset member 345 extends into the inner wall of the release member 342. When the pressure applied to the release element 342 is released, the elastic reset element 345 can drive the release element 342 to reset, and the locking element 341 will also reset accordingly. In some embodiments, the limit block 3493 can be disposed between the second ends of the two elastic arms 3411 to make full use of the space between the second ends of the two elastic arms 3411, which helps to make the support 349 structure more compact.

Fifth aspect

As shown in Figures 44 and 45, the fifth aspect of this invention provides a carrier, which can be a stroller, wheelchair, high chair, high chair, etc. In this embodiment, a child carrier such as a stroller will be specifically described. The carrier includes a frame 100, a seat assembly 200, and a height adjustment mechanism 800. The height adjustment mechanism 800 has a simple structure and is easy to operate.

Specifically, as shown in Figures 44 and 45, the frame 100 includes at least a push handle 120, a front foot support 160, a rear foot support 170, a front wheel assembly 181, and a rear wheel assembly 182. The front foot support 160 includes a first front foot support rod 161 and a second front foot support rod 162 located on both sides. A foot pedal 190 (also called a footrest) is connected between the first front foot support rod 161 and the second front foot support rod 162. The rear foot support 170 includes a first rear foot support rod 171 and a second rear foot support rod 172 located on both sides. The bottom ends of the first front support rod 161 and the second front support rod 162 are respectively connected to the front wheel assembly 181. The bottom ends of the first rear support rod 171 and the second rear support rod 172 are respectively connected to the rear wheel assembly 182.

Specifically, as shown in Figures 44 and 45, the front foot support rods 161 and 162 are elongated structures. The top ends of the front foot support rods 161 and 162 are hinged to the corresponding rear foot support rods 171 and 172, and the lower ends of the front foot support rods 161 and 162 are connected to the front wheel assembly 181. The foot pedal 190 is located between the two front foot support rods 161 and 162.

The height adjustment mechanism 800 includes a forefoot support assembly 810 and a locking assembly 830. A foot pedal 190 is disposed between the two forefoot support assemblies 810 and is height-adjustable relative to the forefoot support assemblies 810. The locking assembly 830 is disposed between the forefoot support assemblies 810 and the foot pedal 190 and is used to lock or unlock the height adjustment of the foot pedal 190 relative to the forefoot support assemblies 810.

As shown in Figures 44 and 45, each forefoot support assembly 810 includes forefoot support rods 161 and 162 and a guide 811. A locking assembly 830 is disposed between the two forefoot support rods 161 and 162 and the corresponding side of the foot pedal 190 for unidirectional or bidirectional locking of the foot pedal 190 in the height direction. In the illustrated embodiment, the guide member 811 is an elongated structure with a length less than that of the front foot support rods 161 and 162. The guide member 811 is fixed to the opposite inner side of the front foot support rods 161 and 162, that is, fixed to the side opposite to the other front foot support rod 161 and 162, and the extending direction of the guide member 811 is approximately the same as the extending direction of the front foot support rods 161 and 162. At least one of the opposite front side and the opposite rear side of the guide member 811 is provided with a guide groove 8111 disposed along the extending direction of the guide member 811. In this embodiment, both the opposite front side and the opposite rear side of the guide member 811 are provided with guide grooves 8111.

In this embodiment, as shown in Figures 45 and 46, the foot pedal 190 is an integrally formed structure, including a pedal body 191 and snap-fit members 192. The pedal body 191 is generally elongated and plate-shaped. There are two snap-fit members 192, which are respectively connected to the two ends of the pedal body 191 and are respectively angled to the pedal body 191. In this embodiment, the angle between the two snap-fit members 192 and the pedal body 191 is 90 degrees. Each snap-fit member 192 includes a connecting portion 1921 and a mating portion 1922 (Figure 47). There are two mating portions 1922, which are respectively connected to the two sides of the connecting portion 1921. The two ends of the pedal body 191 are respectively connected to the connecting portions 1921 on opposite sides. Each snap-fit part 1922 of each snap-fit piece 192 can be inserted into and engaged with the opposite guide groove 8111 and can slide along the guide groove 8111, thereby driving the foot pedal 190 to move in the height direction.

Specifically, as shown in Figures 45 and 46, a locking component 830 is disposed between the forefoot support component 810 and the foot pedal 190. The locking component 830 can be switched between a locked state and an unlocked state. When the locking component 830 is in the locked state, the foot pedal 190 can be fixed at a certain height relative to the forefoot support component 810, and the foot pedal 190 can be operated to move along a first direction D1. When the locking component 830 is in the unlocked state, the foot pedal 190 can be operated to move along the first direction D1 or a second direction D2. The first direction D1 and the second direction D2 are opposite and both parallel to the height direction. In this embodiment, the upward direction along the guide groove 8111 is defined as the first direction D1, and the downward direction along the guide groove 8111 is defined as the second direction D2. Of course, in other embodiments, the direction can be reversed, that is, the downward direction along the guide groove 8111 is defined as the first direction D1, and the upward direction along the guide groove 8111 is defined as the second direction D2.

Specifically, as shown in Figures 45 and 46, the locking assembly 830 includes an operating member 831, two locking members 832, two linkage members 833, a first reset member 834, two second reset members 835, a plurality of first locking slots 836, a plurality of second locking slots 837, and a plurality of third locking slots 838. An operating element 831 is operably disposed approximately at the center of the foot pedal 190. A first reset element 834 is disposed between the operating element 831 and the foot pedal 190. Two linkage elements 833 are respectively connected to both sides of the operating element 831. Two locking elements 832 are respectively connected to the side of the two linkage elements 833 away from the operating element 831. Two second reset elements 835 are respectively disposed between the two locking elements 832 and the foot pedal 190. Multiple first locking slots 836 and multiple second locking slots 837 are respectively disposed on the two guide elements 811.

The structure of the height adjustment mechanism 800 is described below using the connection structure between the left-side forefoot support assembly 810, the foot pedal 190, and the locking assembly 830 as an example. The connection structure between the right-side forefoot support assembly 810, the foot pedal 190, and the locking assembly 830 is similar.

Furthermore, as shown in Figure 46, the inner side of the guide member 811, that is, the side of the guide member 811 opposite to another guide member 811, is provided with a plurality of first locking grooves 836, which are arranged along the height direction. Each of the first locking grooves 836 is a unidirectional locking groove used to restrict the foot pedal 190 from moving in the second direction D2. Specifically, the depth of each first locking groove 836 gradually decreases to zero along the first direction D1. Specifically, the top wall of each first locking groove 836 is a first pushing slope 8361, which gradually slopes towards the opposite guide member 811 along the first direction D1. The bottom wall of each first locking groove 836 is a limiting wall 8362, which is substantially perpendicular to the guide member 811, that is, the limiting wall 8362 is substantially parallel to the horizontal plane. The limiting wall 8362 is used to restrict the movement of the foot pedal 190 in the second direction D2.

The inner side of the guide member 811, that is, the side of the guide member 811 opposite to another guide member 811, is also provided with at least one second locking groove 837. The second locking groove 837 is a bidirectional locking groove used to restrict the foot pedal 190 from moving in the first direction D1 and the second direction D2. The two ends of the second locking groove 837 along the height direction have a first limiting sidewall 8371 and a second limiting sidewall 8372, respectively. At least one second locking groove 837 is located on the first direction D1 of a plurality of first locking grooves 836. In this embodiment, each guide member 811 has two first locking grooves 836 and one second locking groove 837 on its inner side. The second locking groove 837 is located above the two first locking grooves 836 to limit the travel of the foot pedal 190 in the first direction D1, i.e., upward. In other words, the second locking groove 837 has a limiting function to prevent the foot pedal 190 from moving excessively upward. Of course, in other embodiments, the number of first locking grooves 836 and second locking grooves 837 can be adjusted as needed, or only multiple first locking grooves 836 can be provided without second locking grooves 837.

As shown in Figures 45 and 48, a third locking groove 838 is provided on the inner side of the guide member 811, that is, on the side of the guide member 811 opposite to another guide member 811. The third locking groove 838 is located in the second direction of the plurality of first locking grooves 836, that is, below the plurality of first locking grooves 836. The third locking groove 838 has a second abutting slope 8381, which gradually slopes towards the guide member 811 on the opposite side along the first or second direction. The third locking groove 838 also has an installation opening 8382 opposite to the second abutting slope 8381. When the locking member 832 is in the locked state, the locking member 832 extends at least partially beyond the foot pedal 190 (as shown in Figure 46). When the foot pedal 190 is installed on the forefoot support assembly 810, the locking member 832 is inserted into the third locking groove 838 through the mounting port 8382, which makes it easy to install the foot pedal 190 on the forefoot support assembly 810.

Furthermore, as shown in Figures 45 and 48, the height adjustment mechanism 800 may also include a limiting member 850, which is generally elongated tubular in shape. The two ends of the limiting member 850 are respectively fixed to the inner sides of the two front foot support rods 161 and 162. The limiting member 850 is located in the second direction of the third locking groove 838, that is, below the third locking groove 838. When the locking member 832 is inserted into the third locking groove 838, the foot pedal 190 abuts against the limiting member 850 to restrict the foot pedal 190 from moving in the second direction.

In this embodiment, as shown in Figures 45 and 48, the front foot support rod 161 or 162 includes a support rod body 163 and a wheel seat connection portion 164. The two ends of the limiting member 850 are respectively fixed to the wheel seat connection portions 164 of the two front foot support rods. During the installation of the vehicle, the locking member 832, which at least partially extends from both sides of the foot pedal 190, can first be inserted into the third locking groove 838 through the mounting port 8382 so that the foot pedal 190 is installed between the two support rod bodies 163. Then, the two wheel seat connection portions 164 connected to the limiting member 850 are respectively installed at the lower ends of the two support rod bodies 163, so that the limiting member 850 is located below the third locking groove 838. Thus, when the locking member 832 is inserted into the third locking slot 838, the foot pedal 190 can abut against the limiting member 850 to restrict the foot pedal 190 from moving in the second direction.

Further, as shown in Figures 46 and 47, the foot pedal 190 has a hollow cavity 193 in which both the locking member 832 and the linkage member 833 are movably disposed. The locking member 832 is generally pin-shaped. The linkage member 833 is generally rod-shaped and has a first end 8331 and a second end 8332. One end of the locking member 832 can extend out of the hollow cavity 193 to engage with a first locking groove 836 or a second locking groove 837, and the other end of the locking member 832 is fixedly connected to the second end 8332 of the linkage member 833. The first end 8331 of the linkage member 833 is connected to the operating member 831. The operating element 831 is operably disposed on the foot pedal 190. At least part of the operating element 831 extends into the hollow inner cavity 193 and is connected to the linkage 833, while the other part of the operating element 831 extends out of the hollow inner cavity 193 for operation.

Specifically, as shown in Figures 46 and 47, the locking member 832 can be switched between a locked position and an unlocked position. When the locking member 832 is in the locked position, it can be inserted and engaged with any one of the plurality of first locking slots 836 or at least one of the second locking slots 837. When the locking member 832 is in the unlocked position, it can be disengaged from the plurality of first locking slots 836 or at least one of the second locking slots 837.

Furthermore, as shown in Figures 46 and 47, the operating member 831 can be operated to drive the locking member 832 from the locked position to the unlocked position via the linkage 833. The operating member 831 is provided with two drive grooves 8311. Specifically, the extending direction of each drive groove 8311 intersects the moving direction of the operating member 831 and the moving direction of the locking member 832, respectively. The first end 8331 of the linkage 833 is inserted into the drive groove 8311 and can move along the drive groove 8311. In this embodiment, the first end 8331 of the linkage 833 may be provided with a drive pin (not shown in the figures), which is inserted into the drive groove 8311 to move along the drive groove 8311. As shown in Figure 46, the drive groove 8311 located on the left side of the operating member 831 is inclined along the D3 direction (i.e., the direction in which the operating member 831 can be pressed) toward the guide member 811 on the corresponding side. The end of the drive groove 8311 that is close to the guide member 811 on the corresponding side is called the first groove end 83111, and the end of the drive groove 8311 that is away from the guide member 811 on the corresponding side is called the second groove end 83112. When the operating member 831 is pressed along the D3 direction, the first end 8331 of the linkage 833 (or the drive pin at the first end 8331) moves from the first groove end 83111 of the drive groove 8311 to the second groove end 83112, thereby causing the linkage 833 and the locking member 832 to move together away from the guide member 811 on the corresponding side, thereby causing the locking member 832 to switch from the locked position to the unlocked position.

Further, as shown in Figure 46, a first reset member 834 is disposed between the operating member 831 and the foot pedal 190. The first reset member 834 is used to bias the operating member 831 so that the operating member 831 moves in the direction that drives the locking member 832 to the locked position. In this embodiment, the first reset member 834 is a spring, which is used to provide a reset elastic force for the operating member 831. Specifically, a first mounting post 194 is provided in the hollow inner cavity 193 of the foot pedal 190. The operating member 831 is provided with a mounting cavity 8312 that can communicate with the hollow inner cavity 193. A second mounting post 8313 is provided in the mounting cavity 8312, which is opposite to the first mounting post 194, and the first mounting post 194 is located in the D3 direction of the second mounting post 8313. The two ends of the first reset member 834 are respectively sleeved on the outside of the first mounting post 194 and the second mounting post 8313 to prevent the first reset member 834 from shifting.

Further, as shown in Figures 46 and 47, a second reset member 835 is disposed between the locking member 832 and the foot pedal 190. The second reset member 835 is used to bias the locking member 832 to move the locking member 832 to the locked position. In this embodiment, the second reset member 835 is a spring, which is used to provide an elastic force to reset the locking member 832 to the locked position. Specifically, the portion of the foot pedal 190 in the hollow cavity 193 in which the locking member 832 is installed is provided with a first boss 195. The locking member 832 is provided with a second boss 8321 opposite to the first boss 195, and the second boss 8321 is located on the side of the first boss 195 near the guide member 811. The second reset member 835 is sleeved outside the locking member 832, and the two ends of the second reset member 835 abut against the first boss 195 and the second boss 8321 respectively, to prevent the second reset member 835 from shifting.

In the above embodiment, the height adjustment process of the foot pedal 190 is as follows:

As shown in Figures 46 and 47, to raise the height of the foot pedal 190, assuming the foot pedal 190 is at the height position shown in Figure 46, that is, the locking member 832 on the foot pedal 190 is inserted into the first locking groove 836 at the highest position, the foot pedal 190 can be directly pushed in the first direction D1, so that the locking member 832 on the foot pedal 190 is in the first locking position. Under the action of the first pushing inclined surface 8361 in the groove 836 (or under the action of the second pushing inclined surface 8381 if the locking member 832 is inserted in the third locking groove 838 at this time), it gradually moves away from the guide member 811 on the corresponding side (taking the locking member 832 on the left side shown in Figure 46 as an example, that is, it moves in the D4 direction), and the second reset member 835 is gradually compressed. When the locking member 832 moves to the uppermost end of the first pushing inclined surface 8361, that is, when the locking member 832 has moved out of the first locking groove 836, the locking member 832 is in the unlocked position. At this time, as the foot pedal 190 continues to be pushed in the first direction D1, the locking member 832 continues to maintain the unlocked position under the pushing action of the inner side of the guide member 811. When the locking member 832 moves with the foot pedal 190 to be opposite the second locking groove 837, the locking member 832, having lost the pushing action of the inner side of the guide member 811, is reset to the locked position under the action of the second reset member 835 and inserted into the second locking groove 837. In this way, the foot pedal 190 is fixed at a higher position. It should be understood that, since the second locking groove 837 is a bidirectional locking groove, even if the foot pedal 190 at this height position is continued to be pushed in the first direction D1, it cannot continue to move in the first direction D1 due to the restriction of the first limiting sidewall 8371. However, if the locking member 832 is inserted into either of the first locking grooves 836 at this time, the foot pedal 190 can still be continued to be pushed in the first direction D1 and continue to move in the first direction D1. Meanwhile, during the above process, as the locking member 832 moves from the locked position to the unlocked position along the first pushing inclined surface 8361, since the locking member 832 is fixedly connected to the linkage member 833, the linkage member 833 will also move in the D4 direction under the drive of the locking member 832 (taking the linkage member 833 on the left side shown in Figure 46 as an example), and drive the operating member 831 to move in the D3 direction through the second end 8332 (or the locking pin at the second end 8332), and the first reset member 834 is compressed.

As shown in Figures 46 and 47, to lower the height of the foot pedal 190, assuming the foot pedal 190 is at the height position shown in Figure 46, i.e., the locking member 832 on the foot pedal 190 is inserted into the first locking groove 836 at the highest position, the operating member 831 needs to be pressed in the D3 direction, so that the first end 8331 of the linkage 833 (or the locking pin at the first end 8331) moves along the drive... The moving groove 8311 moves from the first groove end 83111 to the second groove end 83112, causing the linkage 833 to move in the D4 direction (taking the linkage 833 on the left side of Figure 46 as an example), simultaneously driving the locking member 832 to move in the D4 direction as well (taking the locking member 832 on the left side of Figure 46 as an example), that is, driving the locking member 832 to move away from the guide member 811 on the corresponding side. When the locking member 832 moves from the locked position to the unlocked position, the locking member 832 disengages from the first locking groove 836 in the highest position. At this time, the foot pedal 190 can be pulled in the second direction D2, so that the foot pedal 190 moves downward. When the foot pedal 190 moves to be opposite any other first locking slot 836, the operating member 831 can be released. The operating member 831 is reset by the first reset member 834, simultaneously driving the linkage 833 to move in the opposite direction of D4 (taking the linkage 833 on the left side of Figure 46 as an example). The locking member 832, driven by the linkage 833 and the elastic force of the second reset member 835, returns from the released position to the locked position, allowing the locking member 832 to be re-inserted into any other first locking slot 836. Thus, the foot pedal 190 is fixed at a lower position height.

As shown in Figures 49 to 51, another embodiment of the present invention proposes another height adjustment mechanism 800, which includes a forefoot support component 810, a foot pedal 190, a locking component 830, and a latching component 860. The forefoot support component 810 and the locking component 830 have the same structure as in the first embodiment. The difference lies only in that, in this embodiment, the foot pedal 190 and the latching component 860 are two independent components, while in the previous embodiment, the foot pedal 190 included a pedal body 191 and a latching component 192, which were integrally formed.

As shown in Figures 50 and 51, there are two snap-fit connectors 860, which are respectively connected to both sides of the foot pedal 190. The following description uses the structure of one side of the foot pedal 190 as an example to illustrate the snap-fit connector 860 and the foot pedal 190:

The snap-fit component 860 includes a snap-fit body 861 and a connecting portion 862 that are interconnected and angled together. The snap-fit body 861 is at least partially inserted into the guide groove 8111 and can slide along the guide groove 8111. Specifically, the side of the snap-fit body 861 facing away from the connecting portion 862 has two opposing mating portions 8612. The snap-fit component 860 can engage with the guide groove 8111 on the guide component 811 through these two mating portions 8612 and can slide along the guide groove 8111. The snap-fit body 861 has a through hole 8611. One end of the foot pedal 190 has a notch 196. When the locking member 832 is in the locked position, the locking member 832 can extend out of the hollow inner cavity 193 from the notch 196. The connecting part 862 can be inserted into the recess 196 to realize the connection between the snap-fit member 860 and the foot pedal 190. At the same time, when the locking member 832 is in the locked position, the locking member 832 can extend out of the hollow inner cavity 193 from the recess 196 and be inserted into either the first locking groove 836 or the second locking groove 837 through the through hole 9611.

Of course, in other embodiments not shown, the guide member 811 may also be omitted, and the guide groove 8111 may be directly provided on the front foot support rods 161 and 162. The snap-fit member 860 directly engages with the guide groove 8111 of the front foot support rods 161 and 162 through these two mating parts 8612.

In this embodiment, the snap-fit member 860 is retractably or movably connected to the foot pedal 190. As shown in Figures 49 and 81, since the connecting part 862 has a certain length in the horizontal direction, when the two connecting parts 862 are respectively inserted into the recesses 196 at both ends of the foot pedal 190, the foot pedal 190 can move towards or away from either the forefoot support component 810 or the snap-fit body 861, that is, the foot pedal 190 can move within a certain range in the horizontal direction. This configuration effectively adjusts the width of the foot pedal area (here, the foot pedal area refers to the sum of the horizontal dimension of the foot pedal 190 and the horizontal dimension of the connecting part 862 protruding from the foot pedal 190) by varying the depth of the connecting part 862 inserted into the foot pedal 190. This addresses the issue of inconsistent widths between the two guide members 811 on different vehicles due to machining tolerances in the two front foot support components 810. On the one hand, the problem of uneven height adjustment can be solved. On the other hand, when the front foot support assembly 810 is tilted, that is, when the front foot support rods 161, 162 or the guide 811 is tilted, and the upper angle α between the front foot support rods 161, 162 and the foot pedal 190 (as shown in Figure 49) is less than 90 degrees, the problem of uneven sliding of the foot pedal 190 caused by the different distances between the bottom and top of the two sets of front foot support rods 161, 162 of the vehicle can be solved.

The aforementioned height adjustment mechanism 800 and vehicle have at least the following beneficial effects:

In the aforementioned height adjustment mechanism 800 for a vehicle, a locking component 830 is provided between the front foot support assembly 810 and the foot pedal 190. When the locking component 830 is in the locked state, the foot pedal 190 can be fixed at a certain height relative to the front foot support assembly 810. When the foot pedal 190 is operated, the foot pedal 190 can move along a first direction D1 parallel to the height direction. When the locking component 830 is in the unlocked state, the foot pedal 190 can move either along the first direction D1 or along a second direction D2 opposite to the first direction D1 when operated. The locking component 830 can unidirectionally lock the foot pedal 190 in the height direction, so that the user only needs to release the locking component 830 when moving the foot pedal 190 in the second direction D2, and does not need to release the locking component 830 when moving the foot pedal 190 in the first direction D1. This height adjustment mechanism 800 has a simple structure and is easy to operate.

In another embodiment of the present invention, the height adjustment mechanism 800 can adjust the width of the foot pedal 190 at the same time as adjusting the height, in cases where there are machining tolerances in the two front foot support components 810 or the two front foot support rods 161 and 162 are tilted, by means of the snap-fit component 860, to accommodate children of different ages or solve the problem of the foot pedal 190 being difficult to adjust.

The technical features of each embodiment in each of the above aspects can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in each embodiment in each of the above aspects are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

The embodiments described above merely illustrate several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the inventive concept, and these all fall within the scope of protection of the present invention. Therefore, the scope of protection of this invention patent shall be determined by the appended patent application.

38: First mating surface; 91, 92, 93, 94: Pivot; 95: First connecting shaft; 96: Second connecting shaft; 97: Pivot shaft; 100: Frame; 101, 102: Side frame; 110: Seat post; 120: Push handle frame; 121: Push handle body; 122: First push handle rod; 123: Second push handle rod; 130: Handrail frame; 131: Handrail body; 132: First handrail rod; 133: Second handrail rod; 140: Auxiliary... 150: Frame 160: Front foot support frame 161: First front foot support rod 162: Second front foot support rod 164: Wheel seat connection 170: Rear foot support frame 171: Rear foot support rod 172: Second rear foot support rod 173: Rear crossbar 181: Front wheel assembly 182: Rear wheel assembly 190: Foot pedal 191: Body 192: Clip-on part 193: Hollow inner cavity 194: First mounting post 1 95: First boss; 196: Notch; 1000: Carrier; 1101, 1102, 1201, 1301, 1302, 1401, 1402, 1501, 1502, 1601, 1602, 1612, 1701, 1702: Hole; 1205: Cut surface; 1303: First slide groove; 1304: Second slide groove; 1403: Slide groove; 1500: Linkage assembly; 1503: Locking mechanism. 1503a: First locking groove; 1503b: Second locking groove; 1510: First connecting rod; 1511: First movable part; 1512: First hinge part; 1513: Drive groove; 1520: Second connecting rod; 1521: First rod part; 1522: Second rod part; 1523: Second movable part; 1524: Second hinge part; 1600: Limiting block; 1610: Limiting body part; 1611: Mounting groove; 1613: First... 1614: Guide groove; 1615: Groove; 1616: Extended support; 1617: Limiting protrusion; 1618: End face; 1620: Telescopic part; 1621: Slider; 1622: Elastic return element; 1630: Limiting mechanism; 1631: Limiting hole; 1632: Limiting protrusion; 1700: Mounting base; 1710A: First accommodating space; 1710B: Second accommodating space; 1710: Casing; 1711: 1712: First limiting part; 1713: Second limiting part; 1720: Cover; 1721: Step; 1722: Opening; 1921: Connecting part; 1922: Fitting part; 15111: First movable protrusion; 15231: Second movable protrusion; 200: Seat assembly; 212: Second protrusion; 213: Recess; 214: Through hole; 220: Movable frame; 221: Sliding sleeve; 222: Connecting part; 223: First mounting plate. Mounting part 224: Second mounting part 225: Groove 226: Snap-fit part 230: Seat frame 2221: Slot 2222: Guide slot 2222a: First slot 2222b: Second slot 2222c: First end 2222d: Second end 2223: First connecting section 2224: Second connecting section 300: Armrest mounting units 301, 302: Hole 310: First connecting seat 312: Snap-fit groove 320: Second connector 323: Reception space 325: Pivot 327: Card dispensing part 330: First magnetic clasp 340: Space 341: Engaging part 342: Release part 345: Elastic return part 348: Second magnetic clasp 349: Support 370: Mounting base 371: Protrusion 372: Anti-rotation table 376: Fastening mechanism 377: Connecting hole 378: Boss 3101: Body 3102: Outer surface 103: Positioning groove; 3104: Limiting bottom; 3105: Positioning post; 3106: Locking hole; 3107: Mounting hole; 3108: Recessed platform; 3109: Opening; 3220: Second mating surface; 3222: Insertion hole; 3231, 3232: Mounting hole; 3411: Elastic arm; 3412: Fixing part; 3413: Abutting part; 3421: Pushing part; 3421a: Pushing inclined surface; 3421c: Sliding surface; 3423 : Operating part 3429: Shoulder 3491: Spacer 3492: Fastener 3493: Limit block 3494: Positioning post 3495: Boss 3496: Guide surface 3497: Mounting post 3498, 34120: Hole 3710, 34950: Reception cavity 3761: Flexible arm 3762: Fastener 34111: Engaging part 34951: Bottom 34952: Opening 400: Backrest Component 410: First backrest frame; 411: Backrest body; 412: First backrest rod; 413: Second backrest rod; 414: Movable end; 420: Second backrest frame; 421: Backrest horizontal frame; 422: Backrest vertical frame; 430: Strap; 440: Strap adjuster; 450: Backrest tube; 460: Limiting piece; 500: Linkage mechanism; 510: Linkage rod; 512: First protrusion; 520: Elastic element; 530: Transmission assembly. 531: Linkage gear; 532: Driven gear; 533: Output gear; 540: Sliding member; 541: Tooth; 542: Connecting part; 543: Sliding part; 544: Through hole; 550: Traction member; 560: Drive wheel; 580: Guide member; 590: Connecting member; 600: Drive assembly; 610: First drive rod; 620: Second drive rod; 630: Linkage shaft; 631: First shaft segment; 632: Second shaft segment; 633: ... Three-axis segment 634: Shoulder 635: Center hole 640: Linkage mechanism 650: Fastener 660: Pivot 6011, 6321, 6331: Sections 601, 603: Hole 700: Closing locking mechanism 710: First operating element 730: Locking pin 731: Locking part 732: First pushing part 740: First slider 741: Second pushing part 800: Height adjustment mechanism 810: Front foot support Support component 811: Guide component 830: Locking component 831: Operating component 832: Locking component 833: Linking component 834: First reset component 835: Second reset component 836: First locking groove 837: Second locking groove 838: Third locking groove 850: Limiting component 860: Snap-fit component 861: Snap-fit body 862: Connecting part 8111: Guide groove 8311: Drive groove 8312: Mounting cavity 83 13: Second mounting post 8321: Second boss 8331: First end 8332: Second end 8361: First pushing slope 8362: Limiting wall 8371: First limiting side wall 8372: Second limiting side wall 8381: Second pushing slope 8382: Mounting port 8611: Through hole 8612: Mating part 83111: First groove end 83112: Second groove end 910: Second operating component 9 20: Second slider 921: Engaging groove 930: First engaging block 931: First stop plate 940: Second engaging block 941: Second stop plate 980: Fastener 9332: Second end 9611: Through hole D1, P: First direction D2, Q: Second direction D3: Third direction D4: Fourth direction D5: Fifth direction F1: First forward direction F2: Second forward direction M: First rotating shaft N: Second rotating shaft S1: First direction S2: Second direction

The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention.

Figure 1 shows a perspective view of the vehicle provided according to the first aspect of the present invention, with the vehicle in an deployed state.

Figure 2 shows an exploded view of the vehicle shown in Figure 1.

Figure 3 shows a three-dimensional view of the drive assembly in the vehicle shown in Figure 1 at one angle.

Figure 4 shows a three-dimensional view of the drive assembly in the vehicle shown in Figure 1 from another angle.

Figure 5 shows a three-dimensional view of the limiting block in the vehicle shown in Figure 1.

Figure 6 shows a three-dimensional view of the vehicle shown in Figure 1 in a state between the deployed and retracted states.

Figure 7 shows a cross-sectional view of the vehicle shown in Figure 1 in another state between the deployed and retracted states.

Figure 8 shows a three-dimensional view of the vehicle shown in Figure 1 in the folded state.

Figure 9 shows a schematic diagram of the structure of the vehicle provided according to the second aspect of the present invention, wherein the frame is in an unfolded state.

Figure 10 shows an exploded view of the vehicle shown in Figure 9.

Figure 11 shows a structural schematic diagram of the vehicle shown in Figure 9 from another viewpoint, as well as a partial enlarged view of some seat components and linkage components.

Figure 12 shows a schematic diagram of the structure of the vehicle shown in Figure 9 after omitting the front support frame, rear support frame, and wheel assembly.

Figure 13 shows an exploded view of point A in the vehicle shown in Figure 12.

Figure 14 shows a side sectional view of the vehicle shown in Figure 9 and a partial enlarged view of some seat components, linkage components and backrest components, wherein the frame is in the unfolded state and the straps are at the first length.

Figure 15 shows a side sectional view of the vehicle shown in Figure 9 and a partial enlarged view of some seat components, linkage components and backrest components, in which the frame is in the unfolded state and the straps are at the second length.

Figure 16 shows a schematic diagram of the structure of the vehicle shown in Figure 15 after the pusher arm is reversed, as well as enlarged views of some seat components, linkage components and backrest components.

Figure 17a shows a side sectional view of the vehicle shown in Figure 9 and a partial enlarged view of some seat components, linkage components and backrest components, with the frame in a folded state.

Figure 17b shows another view of the vehicle shown in Figure 17a in its folded state.

Figure 18 shows a perspective view of a vehicle according to a first embodiment of the third aspect of the present invention in a first use state.

Figure 19 shows a perspective view of the vehicle according to the first embodiment of the third aspect of the present invention in a second use state.

Figure 20 illustrates a perspective view of the vehicle according to the first embodiment of the third aspect of the present invention after the front foot support and the rear foot support have been removed.

Figure 21 shows a partial exploded view of the vehicle according to the first embodiment of the third aspect of the present invention after the front foot support and the rear foot support have been removed.

Figure 22 shows a partial enlarged view of a portion of Figure 21.

Figure 23 illustrates another view of the vehicle according to the first embodiment of the third aspect of the invention, after removing the front and rear support frames.

Figure 24 shows a partial enlarged view of a portion of Figure 23.

Figure 25 shows a perspective view of a vehicle according to the second embodiment of the third aspect of the present invention.

Figure 26 shows a side sectional view of a vehicle according to a second embodiment of the third aspect of the present invention.

Figure 27 shows a partial enlarged view of a portion of Figure 26.

Figure 28 shows a schematic diagram of the cable after removing some internal details from Figure 27.

Figure 29 shows a side view of the mounting base of the vehicle according to the second embodiment of the third aspect of the present invention, when it is installed in the handrail.

Figure 30 shows a perspective view of the mounting base of the vehicle according to the second embodiment of the third aspect of the present invention and the components mounted therein.

Figure 31 shows an exploded view of the mounting base of the vehicle according to the second embodiment of the third aspect of the present invention and the components mounted therein.

Figure 32 shows an exploded view from another angle of the mounting base of the vehicle according to the second embodiment of the third aspect of the present invention and the components mounted therein.

Figure 33 shows a perspective view of a vehicle according to a third embodiment of the third aspect of the present invention.

Figure 34 shows a partial enlarged view of a portion of Figure 33.

Figure 35 shows a perspective view of a vehicle provided according to the fourth aspect of the present invention, which incorporates a handrail mounting unit provided according to the fourth aspect of the present invention.

Figure 36 shows a three-dimensional view of the handrail body and the frame of the vehicle shown in Figure 35 separated.

Figure 37 shows a partial sectional view along line C-C of the vehicle shown in Figure 35, in which the first and second connecting seats of the handrail mounting unit are connected together.

Figure 38 shows a view of the first connector and the second connector shown in Figure 20 separated from each other.

Figure 39 shows an exploded view of the first connecting seat of the handrail mounting unit provided according to the fourth aspect of the present invention.

Figure 40 shows another exploded view of the first connecting seat of the handrail mounting unit provided according to the fourth aspect of the present invention.

Figure 41 shows an exploded view of the second connector of the handrail mounting unit provided according to the fourth aspect of the present invention.

Figure 42 shows another exploded view of the second connecting seat of the handrail mounting unit provided according to the fourth aspect of the present invention.

Figure 43 shows a partial cross-sectional view along line D-D of the vehicle shown in Figure 35.

Figure 44 shows a schematic diagram of the vehicle provided in the fifth aspect of the present invention.

Figure 45 shows a schematic diagram of the height adjustment mechanism in the vehicle shown in Figure 44.

Figure 46 shows the sectional view along line A-A in Figure 45 and the sectional view of the part circled by the dotted line.

Figure 47 shows the sectional view along line B-B in Figure 45 and the sectional view of the part circled by the dotted line.

Figure 48 shows a cross-sectional view along line C-C of the vehicle shown in Figure 44 after omitting the foot pedals and locking components.

Figure 49 shows a schematic diagram of the height adjustment mechanism provided according to the fifth aspect of the present invention.

Figure 50 shows a top view of the foot pedal in the height adjustment mechanism shown in Figure 49.

Figure 51 shows an exploded view of the foot pedal in the height adjustment mechanism shown in Figure 49.

91, 92, 93, 94: Pivot Axis

100: Frame

110: Seat tube

120: Pushing frame

121: The Essence of Pushing Hands

122: First Pushing Pole

123: Second pusher

130: Handrail

131: Handrail Body

132: First handrail

133: Second handrail

140: Assistive Frame

150: Connecting Frame

160: Forefoot support

161: First forefoot support bar

162: Second forefoot support bar

170: Rear foot support

171: Rear foot support pole

172: Second rear foot support pole

173: Rear Crossbar

181: Front wheel assembly

182: Rear wheel assembly

190: Foot pedals

1000: Vehicles

1600: Limit Block

1613: First end face

1620: Extensor section

220: Movable shelf

226: Connector

230: Seat frame

300: Handrail Installation Unit

400: Backrest Components

410: First backrest frame

411: Backing onto the main body

412: First backrest bar

413: Second backrest bar

414: Event Terminal

430: Straps

440: Belt Adjuster

450: Back-to-back tube

630: Connecting shaft

650: Fasteners

710: First Operating Component

940: Second card combination

941: Second baffle

P: First direction

Q: Second direction

N: Second rotating shaft

S1: First direction

S2: Second direction

Claims (8)

A vehicle includes: a backrest assembly; a frame switchable between a folded state and an unfolded state, wherein the frame includes a seat post extending along the front-rear direction of the vehicle; a seat assembly movably disposed on the seat post of the frame; and a linkage assembly movably connected to the frame, the seat assembly, and the backrest assembly respectively; wherein when the frame is switched from the unfolded state to the folded state, the backrest assembly can be folded toward the seat assembly via the linkage assembly and the seat assembly sliding along the seat post. The vehicle as claimed in claim 1, wherein the linkage assembly includes a first link and a second link, the first link having a first movable portion and a first hinge portion, the first movable portion being movably connected to the seat assembly and the first hinge portion being hinged to the vehicle frame, the second link having a second movable portion and a second hinge portion, the second movable portion being movably connected to the first link and the second hinge portion being hinged to the backrest assembly. The vehicle as claimed in claim 2, wherein the first link has a drive groove located between the first movable part and the first connecting part, and the second movable part is inserted into the drive groove and is slidable along the drive groove. The vehicle as described in claim 2, wherein the seat assembly includes a movable frame slidably disposed on the seat post; the movable frame is provided with a connecting portion, the connecting portion is provided with a guide groove, and the first movable portion is inserted into the guide groove and is movable along the guide groove. The vehicle as described in claim 4, wherein the guide groove includes a first groove portion and a second groove portion that are interconnected, the first groove portion extending along the direction of movement of the movable frame, and the extension direction of the second groove portion intersecting the extension direction of the first groove portion; and/or the guide groove has a first end and a second end, wherein when the frame is in an extended state, the first movable portion is at the first end, and when the frame is in a retracted state, the first movable portion is at the second end. The vehicle as described in claim 4, wherein the backrest assembly includes a first backrest frame, a second backrest frame, and a backrest tube, a first end of the first backrest frame being hinged to a second hinge portion of the second connecting rod, a second end of the first backrest frame being hinged to a first end of the second backrest frame, a second end of the second backrest frame being hinged to a first end of the backrest tube, and the second end of the backrest tube, the portion of the second connecting rod located between the second movable portion and the second hinge portion, and the movable frame being hinged via a first connecting shaft. A vehicle includes: a frame; a seat assembly mounted on the frame and movable relative to the frame in a longitudinal direction between a first position and a second position; a backrest assembly including a strap and a backrest tube supported on the strap, the bottom of the backrest tube being pivoted to the seat assembly; a push arm pivoted to the frame and driving the seat assembly to move relative to the frame in a longitudinal direction relative to the frame when pivoting relative to the frame; and a linkage mechanism disposed on one side of the seat assembly and connected to an end of the strap such that the end of the strap moves synchronously with the seat assembly in a longitudinal direction relative to the frame. As described in claim 7, the linkage mechanism includes a linkage rod, a first end of which is connected to the seat assembly, and a second end of which is connected to the end of the strap. When the seat assembly moves along the front-rear direction of the frame, the seat assembly drives the end of the strap to move along the front-rear direction of the frame via the linkage rod; or the linkage mechanism includes a transmission component and a sliding component, the sliding component being movably mounted to the frame along the front-rear direction of the frame and connected to the end of the strap, the transmission component being connected to the push handle and the sliding component respectively, and capable of... The mechanism can convert the rotation of the pusher arm into the movement of the sliding member along the front-rear direction of the frame, thereby causing the end of the strap to move synchronously with the seat assembly along the front-rear direction of the frame; or the linkage mechanism includes a guide and a connector, the guide being attached to the frame, the end of the strap passing through the guide and connecting to the connector, the connector being connected to the seat assembly, and being able to move with the seat assembly along the front-rear direction of the frame, thereby causing the backrest tube to move synchronously with the seat assembly via the strap, the connector being a separate connector or integrally formed with the strap.