CN120382839A - A delayed flip headrest - Google Patents

Abstract

The application discloses a delayed overturning headrest which comprises a seat bottom plate, a seat back, a headrest frame, a limiting assembly and an unlocking piece, wherein the seat back is rotatably installed on the seat bottom plate, the headrest frame elastically rotates to be installed on an installation frame at the top end of the seat back, the limiting assembly is installed in the headrest frame, the first end of the unlocking piece is connected with the seat bottom plate, and the second end of the unlocking piece is connected with the limiting assembly. The seat has the beneficial effects that through the mechanical structural cooperation of the limiting component and the unlocking piece, the seat can be automatically turned over after being turned over by a certain angle, namely, the headrest can be more installed during folding due to delayed turning over, an additional driving device is not needed, the cost is reduced, and the reliability is improved.

Description

Delay upset headrest

Technical Field

The application relates to the technical field of automobile headrests, in particular to a delayed overturning headrest.

Background

The automobile headrest is a driving comfort configuration article and a safety protection article. When the vehicle is in rear-end collision, the human body can fall backwards due to inertia, at the moment, the acceleration or deceleration pressure of the vehicle is concentrated on the fragile neck and head of the human body, and the headrest plays a role in buffering the fragile neck and head of the human body, so that the head of the human body is protected.

In some rear seats in automobiles, for example, the third row of seats typically need to be folded in order to save space or to facilitate ingress and egress of passengers. As shown in fig. 2, in order to further improve the space utilization rate, the headrest on the seat needs to be folded, and the existing headrest folding modes generally have two modes, namely, manual folding, complex operation and electric folding, and the cost is high due to the fact that the sensor and the driving device are matched. Therefore, how to further improve the folding manner of the existing headrest is a problem to be solved by those skilled in the art.

Disclosure of Invention

One of the objects of the present application is to provide an automatically collapsible delayed flip headrest.

The technical scheme includes that the delay overturning headrest comprises a seat bottom plate, a seat back, a headrest frame, a limiting assembly and an unlocking piece, wherein the seat back is rotatably installed on the seat bottom plate, the headrest frame is elastically rotatably installed on an installation frame at the top end of the seat back, the limiting assembly is installed in the headrest frame, the first end of the unlocking piece is connected with the seat bottom plate, the second end of the unlocking piece is connected with the limiting assembly, when the seat back is in an unfolding state, the limiting assembly is suitable for locking the headrest frame to enable the headrest frame to be in an unfolding state, when the seat back is folded, when the seat back is suitable for rotating along the seat bottom plate for a set angle, the unlocking piece is suitable for unlocking the limiting assembly to lock the headrest frame, and then the headrest frame is folded and contracted under the elastic action.

The seat bottom plate is characterized in that a fixed shaft is fixedly arranged on the rear side of the seat bottom plate, the seat backrest is rotatably arranged on the fixed shaft, a fixed strip is fixedly arranged outside the fixed shaft, the unlocking piece is an unlocking rope, the first end of the unlocking rope is connected with the end part of the fixed strip, the second end of the unlocking rope is connected with the limiting component, when the seat backrest is in an unfolding state, the unlocking rope is in a loose state, and when the seat backrest is folded, the unlocking rope is suitable for tightening and acting on the limiting component, and further locking of the headrest frame is released.

The locking device comprises a fixing ring, a limiting assembly, a locking assembly and an unlocking rope, wherein the fixing ring is sleeved outside the mounting frame and extends upwards in the radial direction to form a locking part, the limiting assembly comprises a limiting ring which is elastically installed in the headrest frame in a rotating mode and is correspondingly parallel to the fixing ring, the limiting ring extends upwards in the radial direction to form a locking groove, the second end of the unlocking rope penetrates through the inside of the headrest frame and is connected with the outside of the limiting ring, when the locking groove is suitable for being matched with the locking part under the action of elasticity, the headrest frame is in a locking state, and when the locking part is driven by the unlocking rope to rotate until the locking part is separated from the locking groove, the headrest frame is in an unlocking state.

Preferably, the limiting assembly further comprises a limiting frame, the limiting frame is elastically rotatably installed in the headrest frame through the bottom end and is perpendicular to the limiting ring, the limiting ring extends along the radial direction and is far away from the locking groove to form a protruding portion, the second end of the unlocking rope is connected with the top end of the limiting frame, and one side of the bottom end of the limiting frame is in abutting fit with the protruding portion.

Preferably, the limit assembly further comprises a limit piece, the limit piece is elastically rotatably installed on the side portion of the headrest frame through a first end, the unlocking rope is connected with the top end of the limit frame, a second end of the unlocking rope penetrates through the headrest frame and is connected with the second end of the limit piece, a guide ring is installed on the side portion of the headrest frame and is sleeved outside the unlocking rope, and when the headrest frame is in an unlocking state, the limit piece is suitable for being in butt fit with the guide ring under the driving of the unlocking rope.

Preferably, the fixing ring extends downwards in the radial direction to form a limiting part, when the headrest frame abuts against the first end of the limiting part, the headrest frame is in an unfolding state, and when the headrest frame abuts against the second end of the limiting part, the headrest frame is in a folding and containing state.

Preferably, the delayed overturning pillow further comprises a driving mechanism, a traction rope and a roller body, wherein the roller body is rotatably sleeved and installed outside the fixed shaft, a first end of the traction rope is connected to the roller body, a second end of the traction rope is connected with the headrest frame, a guide sleeve matched with the traction rope is installed outside the mounting frame, an input end of the driving mechanism is connected with the seat backrest, an output end of the driving mechanism is connected with the roller body, when the seat backrest is folded, the driving mechanism is further suitable for driving the roller body to rotate in a first direction so as to enable the traction rope to be unreeled, and when the seat backrest is unfolded, the driving mechanism is further suitable for driving the roller body to rotate in a second direction so as to enable the traction rope to be reeled and the headrest frame to be unfolded.

Preferably, the driving mechanism comprises a toothed ring, a gear set and a cylinder body, wherein the cylinder body is rotatably arranged on the seat bottom plate through a first end and is coaxially arranged with the fixed shaft, a second end of the cylinder body is connected with the roller body, the toothed ring is fixedly arranged on the seat back and is coaxially arranged with the fixed shaft, the toothed ring is arranged in the seat back, the gear set is arranged on the seat bottom plate, the toothed ring is in matched connection with the cylinder body through the gear set, and when the seat back rotates, the toothed ring is suitable for driving the roller body to rotate through the gear set.

Preferably, the gear set comprises a first gear, a second gear and a third gear, the first gear is rotatably installed on the seat bottom plate through a rotating shaft and meshed with the toothed ring, the second gear is sleeved outside the cylinder body, and the third gear is installed on the rotating shaft and meshed with the second gear.

Preferably, the gear set comprises a first gear and a second gear, the first gear is rotatably installed on the seat bottom plate through a rotating shaft and meshed with the toothed ring, and the second gear is sleeved outside the cylinder and meshed with the first gear.

Compared with the prior art, the application has the beneficial effects that:

According to the invention, the limit component is matched with the mechanical structure of the unlocking piece, and the seat is automatically turned over after being turned over by a certain angle, namely, the delayed turning over of the headrest can ensure that the seat is safer when being folded, and an additional driving device is not needed, so that the cost is reduced, and the reliability is improved.

Drawings

Fig. 1 is a schematic diagram of the overall structure of the present invention.

Fig. 2 is a schematic diagram of the seat of the present invention when folded.

Fig. 3 is a schematic view of the internal structure of the seat back of the present invention.

Fig. 4 is a schematic view of the internal structure of the seat of the present invention after being removed.

Fig. 5 is an overall schematic view of the mechanism for driving the headrest to fold and unfold according to the present invention.

Fig. 6 is a schematic view of the partial structure of fig. 5 according to the present invention.

Fig. 7 is a schematic view of the internal structure of the headrest frame of the present invention.

Fig. 8 is a schematic view of the operating principle of the unlocking rope when the seat back of the present invention rotates.

Fig. 9 is a schematic view showing a state when the headrest frame of the present invention is unlocked.

Fig. 10 is a schematic view of the bottom structure of the headrest of the present invention.

Fig. 11 is a schematic view showing two extreme states of rotation of the headrest frame of the present invention.

Fig. 12 is an overall schematic view of the driving member mechanism of the present invention.

Fig. 13 is an exploded view of the driving mechanism of the present invention.

FIG. 14 is a schematic representation of a first embodiment of the gear set of the present invention.

FIG. 15 is a schematic representation of a second embodiment of the gear set of the present invention.

Fig. 16 is a schematic view showing an internal structure state when the seat of the present invention is folded.

Fig. 17 is a schematic view of the working principle of each component of the seat of the present invention after being unfolded.

1, A seat bottom plate, 101, a mounting seat, 2, a seat backrest, 3, a headrest body, 4, a mounting frame, 401, a supporting rod, 402, a cross rod, 5, an unlocking piece, 501, an unlocking rope, 6, a driving mechanism, 601, a toothed ring, 602, a gear set, 6021, a first gear, 6022, a second gear, 6023, a third gear, 603, a cylinder, 7, a fixed shaft, 8, a traction rope, 9, a headrest frame, 10, a fixing strip, 11, a roller body, 12, a limiting assembly, 1201, a limiting ring, 1202, a limiting frame, 1203, a limiting piece, 13, a guide sleeve, 14, a fixing ring, 15, a locking groove, 16, a protruding part, 17, a locking part, 18, a limiting part, 19, a flexible sleeve, 20, a bearing seat, 21 and a fixing frame.

Detailed Description

The present application will be further described with reference to the following specific embodiments, and it should be noted that, on the premise of no conflict, new embodiments may be formed by any combination of the embodiments or technical features described below.

In the description of the present application, it should be noted that, for the azimuth words such as terms "center", "lateral", "longitudinal", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., the azimuth and positional relationships are based on the azimuth or positional relationships shown in the drawings, it is merely for convenience of describing the present application and simplifying the description, and it is not to be construed as limiting the specific scope of protection of the present application that the device or element referred to must have a specific azimuth configuration and operation.

It should be noted that the terms "first," "second," and the like in the description and in the claims are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order.

Further analyze the problem that current car seat headrest appears when in actual use:

In some seven or even more cars, the rear seats need to be folded under certain conditions of use, in order to save space or to facilitate ingress and egress of passengers. As shown in fig. 2, the folding and shrinking process is performed by rotating, folding and shrinking the seat back 2 toward the seat bottom plate 1, and by rotating, folding and shrinking the headrest body 3 on the seat back 2 downward, so that the folding and shrinking of the whole seat can be completed. In the conventional method, the folding method of the headrest body 3 is generally a manual method, which is time-consuming and labor-consuming and is troublesome. Another way is to use an automatic folding way, which is generally applied to an intelligent advanced automobile, that is, the seat back 2 and the headrest body 3 are all automatically controlled by a driving device (such as a motor), but the headrest body 3 has a small internal volume, so that after the driving control system is installed, the problems of poor heat dissipation, high cost, complex structure and the like are caused, and the headrest body 3 is not suitable for wide popularization and use.

The inventor of the present application has thus developed a delayed flip headrest, one embodiment of which is shown in fig. 1 to 17, comprising a seat pan 1, a seat back 2, a headrest frame 9, a stopper member 12, and an unlocking member 5, wherein the seat back 2 is rotatably mounted to the seat pan 1, the headrest frame 9 can be elastically rotatably mounted to a mounting bracket 4 at the top end of the seat back 2 by a torsion spring, the headrest frame 9 is used for mounting a headrest body 3, the stopper member 12 is mounted in the headrest frame 9, a first end of the unlocking member 5 is connected to the seat pan 1, and a second end of the unlocking member 5 is connected to the stopper member 12.

It can be understood that when the seat back 2 is in the unfolded state (i.e. the seat is in the use state), the limiting assembly 12 locks and limits the headrest frame 9, so that the headrest frame 9 is in the unfolded state (i.e. the headrest body 3 is in the use state), and the torsion spring on the headrest frame 9 is in the deformation energy storage state. When the seat back 2 is folded, the seat back 2 is rotated along the seat bottom plate 1 by a set angle, and then the unlocking piece 5 releases the locking of the limit component 12 to the headrest frame 9, so that the headrest frame 9 is folded and contracted under the action of the elasticity of the torsion spring.

Therefore, the automatic folding and overturning function of the headrest frame 9 can be realized through the mechanical structural cooperation of the limiting component 12 and the unlocking piece 5, the structure is simple and convenient, an additional driving device is not needed, the cost is reduced, and the reliability is improved.

As a further description of the above embodiment, as shown in fig. 3, the mount seats 101 are installed at both side positions of the rear end of the seat pan 1, the fixed shaft 7 is fixedly installed between the two mount seats 101, and the seat back 2 is rotatably provided outside the fixed shaft 7, and the fixing bar 10 is fixedly installed outside the fixed shaft 7. The unlocking member 5 may employ an unlocking string 501, wherein a first end (i.e., bottom end) of the unlocking string 501 is connected to an end of the fixing bar 10, and a second end (i.e., top end) of the unlocking string 501 is connected to the limiting assembly 12.

The principle of how the release line 501 triggers the restraint assembly 12 is described below as shown in fig. 8, when the seat back 2 is in the extended state, the release line 501 is in the relaxed state. When the seat back 2 rotates clockwise, that is, the seat back 2 rotates around the axis of the fixed shaft 7, the bottom end of the unlocking rope 501 is located at the left side of the axis of the fixed shaft 7, so that the seat back 2 can gradually tighten the unlocking rope 501 when rotating, and when a certain angle is reached, the tightened unlocking rope 501 can exert a pulling force to trigger the limiting assembly 12, and further the locking of the headrest frame 9 is released.

It should be noted that, as shown in fig. 8, we can set the set angle of rotation of the seat back 2 to β, and those skilled in the art can set the specific angle of β specifically according to the actual situation. For example, β is seventy degrees, that is, after the seat back 2 rotates seventy degrees, the limiting assembly 12 can be triggered to unlock the headrest frame 9, and of course, the angle may be the limit angle of the folded seat back 2, that is, after the seat back 2 is folded and retracted on the seat bottom 1, the headrest frame 9 is just unlocked and automatically folded under the action of elastic force.

It is to be noted here why the delayed flip is performed after the seat is flipped by a certain angle. Since the headrest body 3 is folded by the elastic force if the headrest is unlocked at the initial stage of the turning of the seat back 2, the restoring force is instantaneous and large at this time, and thus a large impact force is generated, the safety is not good, and since the unlocking rope 501 is gradually tightened according to the turning angle of the seat back 501, the unlocking rope 501 is easily broken.

In one embodiment of the present application, as shown in fig. 5 and 6, the mounting bracket 4 includes a cross bar 402 and a pair of support bars 401, wherein the support bars 401 are symmetrically installed at the top end positions of the seat back 2, the cross bar 402 is fixedly installed at the top end positions of the two support bars 401, and the headrest frame 9 is rotatably installed at the outer positions of the cross bar 402. The fixing ring 14 is fixedly sleeved on the outer part of the cross bar 402, and as shown in fig. 7, the fixing ring 14 extends upwards in the radial direction to form a locking part 17. The limiting assembly 12 comprises a limiting ring 1201, the limiting ring 1201 can be installed in the headrest frame 9 through elastic rotation of a torsion spring, the limiting ring 1201 is corresponding to and parallel to the fixed ring 14, the limiting ring 1201 extends and bends along the radial lower left position to form a locking groove 15, and the top end of the unlocking rope 501 penetrates into the headrest frame 9 and is connected with the outside of the limiting ring 1201.

It will be appreciated that when the locking groove 15 engages with the locking portion 17 under the spring force of the torsion spring, that is, the locking portion 17 is in snap fit with the locking groove 15, the rotation of the headrest frame 9 can be restricted, and the headrest frame 9 is in the unfolded locking limit state. When the seat back 2 is rotated and folded, the unlocking rope 501 generates a pulling force on the stop ring 1201, so that the stop ring 1201 rotates until the locking portion 17 is separated from the locking groove 15, as shown in fig. 9, the headrest frame 9 is in an unlocked state, and then automatically folded under the action of elastic force. Of course, in the process of automatically folding the headrest frame 9, a certain pulling force is also generated on the unlocking rope 501, that is, the unlocking rope 501 drives the locking portion 17 to rotate in a direction far away from the locking groove 15, so that the unlocking rope 501 does not interfere in the process of folding the headrest frame 9.

It should be noted that, the above embodiment may also adopt a variant embodiment that the headrest frame 9 is mounted by elastic rotation of a torsion spring, and the headrest frame 9 is limited by elastic force during normal use, and at this time, the top end of the unlocking rope 501 is connected with the headrest frame 9, and the bottom end of the unlocking rope 501 is mounted unchanged (or a similar mounting manner, so that a pulling force is generated by the unlocking rope 501 when the seat back 2 rotates), and the limiting assembly 12 is omitted. The operating principle is that when the seat back 2 is folded in a rotating way, the unlocking rope 501 can generate a pulling force to further pull and fold the unfolded headrest frame 9. That is, the tightened unlocking rope 501 also gradually pulls the headrest frame 9 to rotate and fold during the gradual rotating and folding process of the seat back 2, and the unlocking rope 501 also gradually slacks during the unfolding process of the seat back 2, and at this time, the headrest frame 9 gradually resets under the action of the elastic force.

It should be noted that, although the structure of the above-mentioned modified embodiment is simpler and also can function as an automatic folding and resetting of the headrest frame 9, it has the disadvantage that ① the unlocking rope 501 needs to bear a larger force, the unlocking rope 501 needs to overcome the elastic force of the torsion spring during the folding process of the headrest frame 9, and the unlocking rope 501 is always in a stretched state when in the folded state, and the service life of the unlocking rope 501 is greatly reduced when the state is maintained for a long time. ② As shown in fig. 8, it should be noted that the greater the distance between the bottom end of the unlocking rope 501 and the left side of the axis of the fixed shaft 7, the greater the relative displacement generated by the second end of the unlocking rope 501 when the seat back 2 rotates, so that the unlocking rope 501 directly drives the headrest frame 9 to rotate and fold, the longer the fixing strip 10 may be required, and thus the larger installation space is required inside the lower end of the seat back 2. The design of the limiting component 12 and the like is adopted in the design, the unlocking rope 501 only plays a triggering role, does not need to bear large acting force, has long service life, and has relatively smaller stroke, so that the installation space in the lower end of the seat back 2 can be saved, and the space utilization rate is improved.

In one embodiment of the present application, as shown in fig. 7, the limiting assembly 12 further includes a limiting frame 1202, the limiting frame 1202 is rotatably mounted in the headrest frame 9 through a bottom end and is perpendicular to the limiting ring 1201, the limiting frame 1202 may also be elastically connected to the headrest frame 9 through a torsion spring, the limiting ring 1201 extends in a radial direction and a direction away from the locking groove 15 to form a protruding portion 16, the second end of the unlocking rope 501 is connected to a top end of the limiting frame 1202, and one side of the bottom end of the limiting frame 1202 is in abutting fit with the protruding portion 16.

It will be appreciated that when the seat back 2 is folded by rotating, the unlocking rope 501 will exert a pulling force on the top end of the limiting frame 1202, and the limiting frame 1202 will rotate along the bottom end, so that the bottom end of the limiting frame 1202 presses the protruding portion 16 of the limiting ring 1201, and drives the limiting ring 1201 to rotate to unlock the headrest. It should be noted that, the reason why the lock release is performed by driving the stop ring 1201 through the stop frame 1202 is that, as shown in fig. 5 to 7, the lock release rope 501 passes through the support rod 401 and enters the inside of the lock release rope from the side of the headrest frame 9, and the stop frame 1202 is parallel to the side of the headrest frame 9, so that the lock release rope 501 needs to enter from the side hole of the headrest frame 9 and be connected with the lower stop frame 1202, at this time, the lock release rope 501 will be bent greatly, and thus the lock release rope 501 will generate a great friction force, on the other hand, we know that the front-rear thickness of the headrest frame 9 is definitely smaller than the left-right or up-down length thereof, and that the lock release rope 501 pulls the stop frame 1202 to rotate can be similar to the lever principle, i.e. the farther the connection point between the lock release rope 501 and the stop frame 1202 is, the labor is saved, and the distance in the front-rear direction of the headrest frame 9 is limited, and the length of the lock release rope 1201 is not suitable to be set long enough. Therefore, the transmission effect can be achieved by arranging the longer limiting frames 1202 in the left, right, upper and lower spaces in the headrest frame 9, so that the unlocking rope 501 can be subjected to smaller acting force when the headrest frame 9 is unlocked, and meanwhile, the unlocking rope 501 passes through the headrest frame 9 and is in an approximately horizontal state after being connected with the limiting frames 1202, so that the bending state of the unlocking rope 501 is further reduced, excessive friction and abrasion of the unlocking rope 501 in the headrest frame 9 are avoided, and the durability and reliability of the whole structure are improved.

Further preferably, as shown in fig. 6, the limiting component 12 further includes a limiting piece 1203, the limiting piece 1203 is elastically rotatably mounted on a side portion of the headrest frame 9 through a first end, specifically, a pin body is rotatably mounted in the headrest frame 9 through a torsion spring, the pin body extends to the side portion of the headrest frame 9 and is connected with the first end of the limiting piece 1203, and then elastic rotation mounting of the limiting piece 1203 is formed. The unlocking rope 501 is connected with the top end of the limiting frame 1202, the second end penetrates through the headrest frame 9 and is connected with the second end of the limiting piece 1203, a guide ring is mounted on the side portion of the headrest frame 9, and the guide ring is sleeved outside the unlocking rope 501.

It will be appreciated that the second end of the release line 501 corresponds to two connection points, namely, the second end of the release line 501 is connected to both the stopper 1202 and the stopper 1203. The headrest has the advantages that the stability of connection at the second end of the unlocking rope 501 is improved by ①, on the other hand, normal use can be guaranteed if the connection point of the unlocking rope 501 and the limiting piece 1203 is separated, namely, the headrest body 3 cannot be used normally if the connection point of the unlocking rope with the limiting piece 1202 is separated, but the second end of the unlocking rope 501 is still positioned at the headrest, and the whole unlocking rope 501 cannot be separated and retracted into the seat backrest 2, so that later maintenance is facilitated, namely, only the headrest is required to be disassembled at the moment. The detachment described above does not mean that the unlocking rope 501 breaks, but the connection point is detached. ② The abutting fit between the limiting piece 1203 and the guide ring can limit the maximum rotation angle of the limiting frame 1202, that is, when the limiting piece 1203 abuts against the guide ring, the limiting frame 1202 rotates to the maximum angle, so that excessive rotation of the limiting frame 1202 can be avoided, and further collision or damage between the limiting ring 1201 and the fixed ring 14 caused by excessive rotation of the limiting ring 1201 can be prevented. ③ Because the limiting piece 1203 and the limiting frame 1202 are elastically installed through the torsion spring, that is, when the unlocking rope 501 is loosened, both the limiting piece 1203 and the limiting frame 1202 are reset under the action of the elasticity, and the design of the limiting piece 1203 provides a guarantee for resetting the limiting frame 1202, for example, the torsion spring on the limiting frame 1202 fails, and at the moment, the resetting function can be achieved under the action of the elasticity of the limiting piece 1203.

Further preferably, as shown in fig. 9, the retaining ring 14 extends radially downward to form a stop 18. It will be appreciated that as shown in fig. 10 and 11 (a), when the headrest frame 9 rotates against the first end (i.e., the left end) of the stopper 18, the headrest frame 9 is in the unfolded state. As shown in fig. 11 (b), when the headrest frame 9 rotates against the second end (right end) of the stopper 18, the headrest frame 9 is in the folded storage state. That is, the maximum rotation angle of the headrest frame 9 in two directions is limited by the design of the limiting portion 18, so that the headrest frame 9 is prevented from being overturned excessively or damaged in the rotation process, and the stability and safety of the overall structure are improved.

Based on the above embodiment, there is a problem in that the headrest body 3 can be automatically folded by the elastic force after the seat back 2 is folded by a certain angle in use. However, after the seat back 2 is unfolded, the headrest body 3 needs to be manually reset, as shown in fig. 7, that is, the headrest frame 9 needs to be rotated until the locking portion 17 and the locking groove 15 are engaged again, so that the unfolding locking of the headrest body 3 can be realized, and further, a certain complexity and inconvenience also exist.

Therefore, in order to solve the above-mentioned technical problems, in one embodiment of the present application, as shown in fig. 5, the delayed overturning pillow further comprises a driving mechanism 6, a traction rope 8 and a roller 11, wherein the roller 11 is rotatably sleeved and installed outside the fixed shaft 7, a first end of the traction rope 8 is connected inside the roller 11, a second end of the traction rope 8 is connected with the headrest frame 9, a guiding sleeve 13 matched with the traction rope 8 is installed outside the mounting frame 4, an input end of the driving mechanism 6 is connected with the seat back 2, and an output end of the driving mechanism 6 is connected with the roller 11, namely, the driving mechanism 6 is installed between the seat back 2 and the seat bottom plate 1.

It will be appreciated that when the seat back 2 is folded in a rotating manner, the seat back 2 acts on the driving mechanism 6, and the driving mechanism 6 drives the roller 11 to rotate in a first direction (clockwise), that is, the roller 11 unwinds the traction rope 8, which prevents interference with the subsequent folding of the headrest, and naturally, when the headrest is fully folded, the traction rope 8 is in a maximally straightened state. When the seat back 2 rotates and expands, the driving mechanism 6 drives the roller 11 to rotate in a second direction (anticlockwise) under the action of the seat back 2, namely, the roller 11 winds the traction rope 8, and then pulls and expands the headrest frame 9 through the traction rope 8, so that the function that the headrest body 3 can be automatically expanded after the seat back 2 is expanded is realized.

The structure of the driving mechanism 6 is not particularly limited, and the following provides a specific example to be referred to:

As shown in fig. 12 (c) and (d), the driving mechanism 6 includes a toothed ring 601, a gear set 602 and a cylinder 603, a bearing housing 20 is fixedly installed at the mounting seat 101 of the seat pan 1, a first end of the cylinder 603 is installed in the bearing housing 20 and the cylinder 603 is coaxially disposed with the fixed shaft 7, a second end of the cylinder 603 is connected with the roller 11, the toothed ring 601 is fixedly installed in the seat back 2 and the toothed ring 601 and the fixed shaft 7 are coaxially disposed, and a gear set 602 is installed at the mounting seat 101 and the toothed ring 601 and the cylinder 603 are cooperatively connected through the gear set 602.

It will be appreciated that when the seat back 2 is unfolded or folded, the seat back 2 will rotate along the axis of the fixed shaft 7, and then the toothed ring 601 will also rotate synchronously, the toothed ring 601 acts on the gear set 602, the gear set 602 acts on the cylinder 603 to rotate, and the cylinder 603 will drive the roller 11 to retract or unwind the rope.

While the gear set 602 may be configured in a variety of ways, including, but not limited to, the following two:

As shown in fig. 14, the gear set 602 includes a first gear 6021, a second gear 6022 and a third gear 6023, wherein the first gear 6021 is rotatably mounted on the mounting seat 101 of the seat bottom 1 through a rotating shaft, the first gear 6021 is meshed with the inside of the toothed ring 601, the second gear 6022 is fixedly sleeved and mounted on the outside of the cylinder 603, and the third gear 6023 is mounted on the rotating shaft and meshed with the second gear 6022.

It can be understood that when the seat back 2 drives the toothed ring 601 to rotate, the toothed ring 601 acts on the first gear 6021 to rotate, the first gear 6021 drives the third gear 6023 to synchronously rotate through the rotating shaft, the third gear 6023 drives the second gear 6022 to rotate, and the second gear 6022 drives the cylinder 603 to rotate, so as to further realize the rotation of the roller 11.

As shown in fig. 15, the gear set 602 includes a first gear 6021 and a second gear 6022, the first gear 6021 is rotatably mounted on the mounting seat 101 of the seat bottom plate 1 through a rotating shaft, the first gear 6021 is meshed with the inside of the toothed ring 601, the second gear 6022 is fixedly sleeved and mounted on the outside of the cylinder 603, and the second gear 6022 is meshed with the first gear 6021.

It can be understood that when the seat back 2 drives the toothed ring 601 to rotate, the toothed ring 601 acts on the first gear 6021 to rotate, the first gear 6021 acts on the second gear 6022 to rotate, and the second gear 6022 drives the cylinder 603 to rotate, so as to rotate the roller 11.

It should be noted that, as shown in fig. 2, the rotation angle of the seat back 2 is not very large when it is folded, and the connection point between the traction rope 8 and the headrest frame 9 and the travel of the traction rope 8 need to be considered, so that the traction rope 8 can save labor and smoothly drive the headrest frame 9 to rotate for resetting, so that it is necessary to ensure that the travel of the traction rope 8 is sufficient. The gear set 602 is designed to amplify the number of turns of the roller 11, so that the pulling rope 8 can meet the actual winding and unwinding requirements. For the first and second structures, the gear is more designed than the second structure, so that the gear ring 601 and the gear set 602 used for the first structure can be smaller in the same scale, so that the device can be compactly installed in the seat back 2, and for the second structure, the structure is simpler. Therefore, the two structures can meet the actual requirements, and the person skilled in the art can select according to the actual conditions.

It should be noted that after the seat back 2 rotates and opens, the headrest body 3 can also be automatically unfolded under the action of the traction rope 8, and the unfolded headrest body 3 can be locked under the action of the limiting ring 1201, and the headrest body 3 can also be locked under the action of the tightened traction rope 8, so that the dual limiting effect is achieved, and the stability and safety of the headrest body 3 after being unfolded are improved.

As shown in fig. 13, the gear sets 602 may be designed in multiple groups, and are uniformly distributed along the circumferential direction of the fixed shaft 7, and for convenience in installation, as shown in fig. 13, a pair of fixing frames 21 which are arranged at intervals and are annular may be fixedly installed on the installation seat 101 of the seat bottom plate 1 through bolts, and corresponding gears are rotatably installed between the two fixing frames 21 through a rotating shaft, so that stability of the whole driving mechanism 6 and stability of driving force transmission are improved, and it is ensured that the driving mechanism 6 can stably and smoothly drive the roller body 11 to retract or unwind the rope in the rotating process of the seat back 2. Of course, on the premise of ensuring smooth transmission, as shown in fig. 14 and 15, a group of gear sets 602 may be adopted based on cost, and because the rotation angle of the seat back 2 is limited, the rotation angle is only about one quarter of a circle, so the number of teeth inside the toothed ring 601 may be set to be missing teeth, for example, half of the teeth inside the toothed ring 601 are provided with teeth, and the other half is of a smooth design, so the processing procedure of the toothed ring 601 can be reduced, and the cost is further reduced.

In this embodiment, as shown in fig. 7 and 10, in order to further reduce abrasion caused by hard extrusion between components, for example, a flexible sleeve 19 is disposed at a matching position of the limiting frame 1202 and the protruding portion 16, a flexible sleeve 19 is disposed at a matching position of the limiting frame 1202 and the headrest frame 9, and a flexible sleeve 19 is disposed at a matching position of the headrest frame 9 and the limiting portion 18, so that abrasion between components can be effectively reduced, durability of the whole structure is improved, noise generated by friction of components can be reduced to a certain extent, and use experience of users is improved. At the same time, the flexible sleeve 19 is preferably made of a material which is wear resistant and has a certain elasticity, such as rubber or silica gel, to ensure that it maintains good performance during use.

The working principle of the invention is as follows:

① As shown in fig. 1, the entire seat is in a deployed state, i.e., the seat back 2 and the headrest body 3 are both in a deployed state.

② As shown in fig. 2, the seat is folded, that is, the seat back 2 is folded in a rotating manner toward the seat pan 1, as shown in fig. 8, the unlocking rope 501 is also tensioned gradually during the folding of the seat back 2, and when the seat back 2 is folded to the limit position or close to the limit position, as shown in fig. 7, the unlocking rope 501 pulls the limit frame 1202 to rotate, and the bottom end of the limit frame 1202 presses the boss 16, so that the limit ring 1201 rotates, the locking groove 15 and the locking portion 17 are separated (as shown in fig. 9), and the locking of the headrest frame 9 is released, and the headrest frame 9 is folded automatically under the action of the elasticity (of the torsion spring). Of course, in the process of rotating and folding the seat back 2, as shown in fig. 12, the toothed ring 601 rotates around the axis of the fixed shaft 7, the toothed ring 601 acts on the gear set 602, the gear set 602 acts on the cylinder 603, and the cylinder 603 drives the roller 11 to rotate and release the traction rope 8, which is also used for preparing for the subsequent folding of the headrest frame 9.

③ The seat is unfolded, as shown by the arrow in fig. 17, that is, the seat back 2 rotates and unfolds towards the position away from the seat bottom plate 1, and in the same way, the toothed ring 601 drives the roller body 11 to rotate reversely through the gear set 602, so as to tighten the traction rope 8, and the folded headrest body 3 is gradually pulled and unfolded, and when the seat bottom plate 1 rotates to the fully unfolded position, the headrest body 3 is just in the fully unfolded position under the action of the traction rope 8. Of course, in the process of rotating and unfolding the seat back 2, as shown in fig. 8, the unlocking rope 501 is also changed from a tight state to a loose state, and then the stop ring 1201, the stop frame 1202 and the stop piece 1203 are rotated and reset under the action of elastic force, as shown in fig. 7, that is, the locking groove 15 and the locking portion 17 are matched again to lock the headrest frame 9, so that the automatic unfolding process of the headrest after the seat is unfolded is completed.

The foregoing has outlined the basic principles, features, and advantages of the present application. It will be understood by those skilled in the art that the present application is not limited to the embodiments described above, and that the above embodiments and descriptions are merely illustrative of the principles of the present application, and various changes and modifications may be made therein without departing from the spirit and scope of the application, which is defined by the appended claims. The scope of the application is defined by the appended claims and equivalents thereof.

Claims (10)

1. A delayed turn-over headrest which comprises a headrest body, characterized by comprising the following steps:

A seat pan;

the seat backrest is rotatably mounted on the seat bottom plate;

the headrest frame elastically rotates a mounting frame arranged at the top end of the seat backrest;

The limiting component is arranged in the headrest frame and

The seat comprises a seat bottom plate, an unlocking piece, a limiting assembly and a headrest frame, wherein the first end of the unlocking piece is connected with the seat bottom plate, the second end of the unlocking piece is connected with the limiting assembly, when the seat back is in an unfolding state, the limiting assembly is suitable for locking the headrest frame so that the headrest frame is in the unfolding state, when the seat back is folded, when the seat back is suitable for rotating along the seat bottom plate for a set angle, the unlocking piece is suitable for unlocking the limiting assembly to lock the headrest frame, and then the headrest frame is folded and contracted under the action of elastic force.

2. The delayed flip headrest of claim 1, wherein a fixed shaft is fixedly arranged at the rear side of the seat bottom plate, the seat back is rotatably arranged on the fixed shaft, and a fixed bar is fixedly arranged outside the fixed shaft;

when the seat back is folded, the unlocking rope is suitable for tightening and acting on the limiting component, so that the locking of the headrest frame is released.

3. The delayed turning headrest of claim 2, wherein a fixed ring is sleeved outside the mounting frame, the fixed ring extends upwards in the radial direction to form a locking part, the limiting assembly comprises a limiting ring which is elastically rotatably mounted in the headrest frame and is correspondingly parallel to the fixed ring, the limiting ring extends upwards in the radial direction to form a locking groove, and the second end of the unlocking rope penetrates into the headrest frame and is connected with the outside of the limiting ring;

The locking groove is suitable for being matched with the locking part under the action of elastic force, the headrest frame is in a locking state at the moment, and the headrest frame is in an unlocking state at the moment when the locking part rotates under the driving of the unlocking rope until the locking part is separated from the locking groove.

4. The delayed flip headrest of claim 3, wherein the stop assembly further comprises a stop, the stop is mounted in the headrest by elastic rotation of the bottom end and is perpendicular to the stop ring, the stop ring extends along the radial direction and is far away from the locking groove to form a protruding portion, the second end of the unlocking rope is connected with the top end of the stop, and one side of the bottom end of the stop is in abutting fit with the protruding portion.

5. The delayed flip headrest of claim 4, wherein the spacing assembly further comprises a spacing piece, the spacing piece is elastically rotatably mounted on the side portion of the headrest frame through a first end, the unlocking rope is connected with the top end of the spacing piece, a second end penetrates through the headrest frame and is connected with the second end of the spacing piece, a guide ring is mounted on the side portion of the headrest frame, the guide ring is sleeved outside the unlocking rope, and when the headrest frame is in an unlocking state, the spacing piece is suitable for being in abutting fit with the guide ring under the driving of the unlocking rope.

6. The delayed flip headrest of claim 5, wherein said retaining ring extends radially downward to form a stop, said headrest frame being in an extended position when said headrest frame abuts a first end of said stop, and said headrest frame being in a collapsed stowed position when said headrest frame abuts a second end of said stop.

7. The delayed roll-over headrest of any one of claims 1-6, further comprising a driving mechanism, a traction rope and a roller body, wherein the roller body is rotatably sleeved outside a fixed shaft, a first end of the traction rope is connected inside the roller body, a second end of the traction rope is connected with the headrest frame, a guide sleeve matched with the traction rope is arranged outside the mounting frame, an input end of the driving mechanism is connected with the seat backrest, and an output end of the driving mechanism is connected with the roller body;

When the seat backrest is folded, the driving mechanism is further suitable for driving the roller body to rotate in a first direction, so that the traction rope is released; when the seat backrest is unfolded, the driving mechanism is further suitable for driving the roller body to rotate in a second direction, so that the traction rope is retracted and the headrest frame is unfolded.

8. The headrest of claim 7, wherein the driving mechanism comprises a toothed ring, a gear set and a cylinder, the cylinder is rotatably mounted on the seat bottom plate through a first end and is coaxially arranged with the fixed shaft, a second end of the cylinder is connected with the roller, the toothed ring is fixedly mounted on the seat back and is coaxially arranged with the fixed shaft, the toothed ring is mounted in the seat back, the gear set is mounted on the seat bottom plate, the toothed ring is in fit connection with the cylinder through the gear set, and when the seat back rotates, the toothed ring is suitable for driving the roller to rotate through the gear set.

9. The delayed flip headrest of claim 8 wherein said gear set includes a first gear rotatably mounted to said seat pan via a shaft and engaged with said toothed ring, a second gear rotatably mounted to said barrel and a third gear rotatably mounted to said shaft and engaged with said second gear.

10. The delayed flip headrest of claim 8 wherein said gear set comprises a first gear rotatably mounted to said seat pan via a shaft and engaged with said toothed ring and a second gear sleeved on said barrel and engaged with said first gear.