CN203860817U - Seat chassis structure - Google Patents

Abstract

The utility model discloses a seat chassis structure, including the chassis, be equipped with the cushion frame on this chassis, the lower extreme of backrest frame articulates on the chassis, be equipped with elastic support structure, the limit structure that leans back and rake adjustment mechanism on the chassis, wherein: the elastic support structure comprises at least one elastic plate, the front end of the elastic plate is positioned in front of a rotating shaft between the chair back frame and the chassis, the rear end of the elastic plate is positioned behind the rotating shaft between the chair back frame and the chassis, and the chassis is provided with a fulcrum for supporting the elastic plate; the backward-leaning limiting structure comprises a locking mechanism arranged on the chassis and a locking groove arranged at the lower part of the chair back frame; the front rake angle adjusting mechanism comprises a hinge mechanism arranged at the rear end of the cushion frame and a lifting mechanism arranged at the front end of the cushion frame. In the utility model, the elastic supporting structure has the advantages of simple structure, easy installation, etc.; the backward limiting structure has the advantages of high reliability, simple structure and the like; the backward-bending limiting structure can flexibly adjust the forward inclination angle of the cushion.

Description

A seat chassis structure

technical field

The utility model relates to a seat component, in particular to a seat chassis structure.

Background technique

In existing office chairs, a relatively rotatable structure is usually arranged between the backrest and the chassis, so that the back of the human body leaning on the backrest has a certain space for movement. In order to ensure comfort, the relative rotation between the backrest and the chassis is elastic, so that the backrest can be elastically reclined relative to the chassis. According to the prior art, the elastic recline of the backrest is realized by setting a spring at the connecting part of the chassis and the backrest. This method has the disadvantages of complicated structure, many parts, and cumbersome assembly.

In addition, when in use, the user sometimes needs to recline the backrest to a certain angle and lock it, so the existing seat is also provided with a reclining limit structure, through which the backrest can be locked at a certain reclined position. In terms of perspective, it meets the different needs of users. However, the existing position-limiting structures have only one locking part, lack reliability, and have complex structures.

In addition, in the existing office chairs, the cushion is arranged on the cushion frame, and the cushion frame is installed on the chassis. Usually, the cushion frame and the chassis are fixed together. In order to improve the comfort, the surface of the cushion is inclined relative to the ground, and the angle of inclination is called the forward inclination angle. In the existing seat, since the cushion frame and the chassis are fixed together, the forward inclination angle is fixed. However, during use, different users or the same user may adjust the forward inclination angle of the seat cushion at different times. There are different requirements, which are clearly not met by existing seats.

Utility model content

The purpose of the utility model is to overcome the deficiencies of the prior art and provide a seat chassis structure, the elastic support structure in the chassis structure has the advantages of simple structure, low cost, easy installation, etc.; It has the advantages of high reliability and simple structure; the chassis structure can flexibly adjust the forward inclination angle of the seat cushion to meet different use requirements.

The technical scheme that the utility model solves the problems of the technologies described above is:

A seat chassis structure, including a chassis, the chassis is provided with a cushion frame, the lower end of the seat back frame is hinged on the chassis, and the chassis is provided with an elastic support structure, a reclining limit structure and a forward tilt angle adjustment mechanism, wherein :

The elastic supporting structure includes at least one elastic plate, the front end of which is located in front of the rotating shaft between the seat back frame and the chassis, and the rear end is located behind the rotating shaft between the seat back frame and the chassis, wherein the The front end of the elastic plate is fixedly connected to the chassis, and the back frame is provided with a pressing part pressed against the rear end of the elastic plate; the chassis is provided with a fulcrum for supporting the elastic plate;

The reclining limit structure includes a locking mechanism arranged on the chassis and a locking groove arranged at the lower part of the seat back frame, wherein the locking mechanism includes two locking blocks and a push block, and the two locking Tight blocks are arranged on both sides of the longitudinal centerline of the chassis, one end of each locking block is connected to the chassis through a rotating shaft, and the other end has a locking portion extending outward; the locking block is provided with a slide groove, and the The push block is provided with a slide bar that extends into the chute and can push the locking block to rotate so that the locking part is inserted into or withdrawn from the locking groove;

The forward inclination adjustment mechanism includes a hinged mechanism arranged at the rear end of the cushion frame and a lifting mechanism arranged at the front end of the cushion frame, wherein the lifting mechanism includes an intermediate hinge, a sliding piece, and the sliding piece can be positioned at different positions in the up and down direction The positioning structure, wherein, the upper end of the intermediate hinge is hinged to the cushion frame, and the lower end is hinged to the slider, and the positioning structure is arranged between the slider and the chassis.

A preferred solution of the present utility model, which also includes a seat cushion front edge position adjustment mechanism, the seat cushion front edge position adjustment mechanism includes a bendable support adjustment assembly, one end of the support adjustment assembly is a fixed end, and the fixed end is fixed on the seat On the cushion frame of the chair, the other end is a movable end. The movable end extends forward, bends and then extends backward to connect with the cushion frame. The movable end is connected with the cushion frame through a front and rear sliding mechanism.

The front edge of the seat cushion is the most front end of the seat in contact with the human body, and the farther the front edge is forward, the greater the effective support range for the human body. For different users, the support ranges of the required cushions are different, and in the existing cushions, because the shape is fixed, the position of the front edge cannot be adjusted, and the use effect is not good. The position of the front edge of the cushion can be changed through the above-mentioned seat cushion front edge position adjustment mechanism to meet the needs of different users.

In a preferred solution of the present utility model, wherein the elastic support structure further includes an elastic force adjustment mechanism, the elastic force adjustment mechanism includes a supporting block and a pushing mechanism for pushing the supporting block to move in the front and rear direction, wherein the supporting block is arranged on the elastic plate On the chassis between the front end and the rear end, the lower surface of the elastic plate is pressed against the support block, and the support block constitutes the fulcrum.

The working principle of the elastic force adjustment mechanism is that since the lower surface of the elastic plate is pressed against the support block to form a fulcrum, the position of the fulcrum of the elastic plate can be changed by pushing the movement of the support block. According to the principle of leverage, the fulcrum is far from the The closer the force point (that is, the contact point between the pressing part and the elastic plate), the greater the elastic force that the elastic plate can provide, thereby realizing the adjustment of the elastic force when the backrest is reclined to meet the needs of different users.

In a preferred solution of the present utility model, wherein, in the elastic support structure, the pushing mechanism includes a worm gear transmission mechanism, a lead screw transmission mechanism and a hand wheel; wherein, the worm in the worm gear transmission mechanism is connected with the hand wheel , the worm gear is connected with the lead screw in the lead screw transmission mechanism; the lead screw nut in the lead screw transmission mechanism is arranged on the support block.

The working principle of the pushing mechanism is: the rotation of the hand wheel is converted into the linear motion of the support block through the transmission of the worm gear and screw drive mechanism in turn, so as to realize the adjustment of the position of the support block.

In a preferred solution of the present utility model, wherein, in the backward position limiting structure, the chute is inclined toward the outside of the longitudinal centerline of the locking block, and the chute on the two locking blocks are combined together to form an "eight" ” shape; the locking block is provided with a guide hole, and the chassis is provided with a guide column extending into the guide hole; the locking groove is provided on the connecting piece used to connect the seat back frame and the armrest, The connecting piece includes a connecting plate, an armrest connecting block and a chair back frame connecting block arranged on the connecting plate; the locking groove is arranged on the inner side of the connecting plate. The above-mentioned structure has the advantages of simple structure, convenient assembly, convenient manipulation and the like.

In a preferred solution of the present utility model, wherein, in the backward position limiting structure, a spring is respectively provided at the front and rear ends of the push block, wherein the elastic coefficient of one spring is greater than that of the other spring, and the two The first spring produces an elastic force in the opposite direction to the push block, and the spring with a large elastic coefficient produces an elastic force on the push block to urge the locking part of the locking block to insert into the locking groove; the push block is provided with a pull rope.

The push block is in an elastic balance state by setting two springs, and under the action of the spring with a large elastic coefficient, the locking part is inserted into the locking groove under normal conditions, and the backrest cannot be tilted back; The rope pulls the push block, overcomes the elastic force of the spring with a large elastic coefficient to move the locking block, and the locking part withdraws from the locking groove, so that the backrest can be tilted back. When the backrest reaches a suitable angle, release the drawstring and lock it reinsert into the locking slot.

In a preferred solution of the present utility model, wherein, in the rake angle adjustment mechanism, the positioning structure includes a plurality of positioning teeth arranged on the chassis along the up and down direction and a rotating chuck arranged on the slider, wherein, One end of the rotating chuck is provided with a locking tooth, the middle part is connected with the sliding part through a rotating shaft, and the other end is provided with a spring for urging the locking tooth to be stuck on the positioning tooth.

By letting the locking teeth of the rotating chuck be stuck on different positioning teeth, the rotating chuck is positioned at different heights, and then the front end of the cushion frame is placed at different heights to adjust the forward inclination angle.

A preferred solution of the present utility model, wherein, in the forward tilt angle adjustment mechanism, the lifting mechanism is provided with an automatic reset mechanism, and the automatic reset mechanism includes a positioning groove arranged on the end of the rotary chuck opposite to the teeth. , a reset block and a vertical chute, wherein the vertical chute is arranged on the chassis, and the reset block is provided with a slider matching the chute and a positioning rod matching the positioning slot; The upward movement stroke of the reset block in the vertical chute is less than the upward movement stroke of the slider, and the downward movement stroke of the reset block in the vertical chute is smaller than the downward movement stroke of the slider.

The purpose of setting the above-mentioned automatic reset mechanism is that when the rotating chuck is stuck on a certain positioning tooth, if you want the rotating chuck to move downwards to allow the seat cushion to rotate downwards, it cannot be realized due to the blocking of the positioning teeth. The above-mentioned automatic reset mechanism can solve this problem.

The working principle of the above-mentioned automatic reset mechanism is: under normal conditions, the positioning rod on the reset block is located on the upper side of the positioning groove of the rotating chuck; the slider drives the rotating chuck to move upward, and the rotating chuck also pushes the reset block to move upward together. When the reset block reaches the end of the stroke of upward movement, it cannot continue to move, but at this time the rotary chuck can still continue to move upward. At this time, the positioning rod on the reset block overcomes the force of the spring and is forcibly snapped into the positioning of the rotary chuck. In the groove, thereby prompting the rotating chuck to rotate at a certain angle, so that the locking teeth on the rotating chuck are separated from the positioning teeth, at this time, the slider and the rotating chuck can move downward; when the reset block reaches the end of the stroke of the downward movement , can no longer continue to move, but at this time, the rotating chuck can still continue to move downward. At this time, the rotating chuck overcomes the active force of the spring, prompting the rotating chuck to rotate a certain angle, and the positioning groove is forcibly separated from the positioning rod. At this time, the rotating chuck The locking teeth on the head can be snapped back into the positioning teeth.

A preferred solution of the present utility model, wherein, in the seat cushion front edge position adjustment mechanism, the front and rear sliding mechanism is composed of a sliding groove and a sliding block, wherein the sliding groove is arranged on the cushion frame, and the sliding block matches It is in the sliding groove and is fixedly connected with the support adjustment assembly; a positioning structure is provided between the sliding block and the cushion frame.

Through this preferred solution, the sliding of the movable end of the support adjustment assembly on the cushion frame is realized, and the movable end is positioned at an exact position, and the structure is simple and the operation is convenient.

In a preferred solution of the present utility model, wherein, the positioning structure is composed of a plurality of positioning dimples provided on the cushion frame and positioning protrusions provided on the sliding block to match the positioning dimples. This preferred solution realizes the fixing of the movable end of the supporting adjustment assembly, and has a simple structure.

The working principle of the utility model is:

In the elastic support structure, since the front end of the elastic plate is fixed, the rear end is pressed by the pressing part of the back frame, and a fulcrum is arranged in the middle. Apply pressure to make the elastic plate elastically rotate around the fulcrum, so as to realize the elastic support for the reclining of the chair back frame;

In the backward limit structure, by pushing the push block forward and backward, the push block can drive the two locking blocks to rotate, so that the locking part of the locking block is inserted into or withdrawn from the locking groove; Push the push block in the direction of exiting the locking groove, and the backrest can be reclined freely. When the backrest is reclined to a suitable position, if the user wishes to lock the backrest in the reclined position, push the push block in the opposite direction so that the locking part inserted into the locking slot;

In the forward tilt adjustment mechanism, since the rear end of the cushion frame is hinged to the chassis (or seat back frame), and the front end is provided with a lifting mechanism, the front end of the cushion frame can be adjusted at different heights by adjusting the lifting mechanism. forward inclination angle.

Compared with the prior art, the utility model has the following beneficial effects:

1. In the elastic support structure, the elastic plate is used as the component for generating elastic force, which has simple structure, low cost and convenient installation. The elastic plate can provide better elastic support than ordinary springs, and has a long service life.

2. In the reclining limit structure, two locking blocks are used to form a locking structure on both sides of the seat chassis, which makes the locking more reliable and improves the safety. It contains few parts, simple structure and easy operation.

3. In the forward tilt angle adjustment mechanism, the forward tilt angle of the seat cushion can be adjusted as required, which meets the requirements of different users or the same user on the forward tilt angle of the seat cushion at different times. The structure is simple and the operation is convenient.

Description of drawings

Fig. 1 is a three-dimensional structural diagram of a specific embodiment of the seat chassis structure of the present invention.

Figures 2 to 6 are schematic structural views showing the elastic support structure of the present invention, wherein Figure 2 and Figure 3 are three-dimensional structural schematic views from two perspectives, Figure 4 is a structural schematic view showing the elastic support structure part, and Figure 5 is Fig. 4 is a schematic diagram of the structure after removing the elastic plate, and Fig. 6 is a schematic diagram of the three-dimensional structure of the support block.

Figures 7 to 11 are structural schematic diagrams showing the backward position limiting structure of the present invention, wherein Fig. 7 is a three-dimensional structural schematic diagram, and Fig. 8 is a structural schematic diagram of the main part of the backward position limiting structure; Fig. 9 is a locking block A schematic diagram of a three-dimensional structure; Figure 10 is a schematic structural diagram of a connector; Figure 11 is a schematic structural diagram of a push block.

Figures 12 to 17 are schematic structural views showing the forward tilt adjustment mechanism of the present invention, wherein Figure 12 is a schematic diagram of a three-dimensional structure (exploded view); Figures 13 to 15 are schematic structural views of the lifting mechanism, wherein Figure 13 is As for the front view, Fig. 14 is a sectional view along A-A of Fig. 13, Fig. 15 is a perspective view; Fig. 16 and Fig. 17 are exploded views of the lifting mechanism at two angles of view.

Figures 18 to 22 are schematic structural views showing the position adjustment mechanism of the front edge of the seat cushion in the present invention, wherein Figure 18 is a schematic three-dimensional structural view, Figure 19 is a partially enlarged view of Figure 18; Figure 20 is an exploded view of Figure 19; 21 is a schematic structural diagram of the sliding block; FIG. 22 is a working principle diagram of the seat cushion front edge position adjustment mechanism.

Detailed ways

The utility model will be further described in detail below in conjunction with the embodiments and accompanying drawings, but the implementation of the utility model is not limited thereto.

Referring to Fig. 1, the chassis structure of the present utility model comprises a chassis 1 on which a cushion frame 3 is arranged. The seat back is composed of the seat back and the seat back frame 2, wherein the lower end of the seat back frame is hinged on the chassis 1; the chassis 1 is provided with an elastic support structure, a reclining limit structure, a forward inclination adjustment mechanism and a seat cushion front. Edge position adjustment mechanism.

Describe in detail below in conjunction with accompanying drawing described elastic support structure:

1 to 4, the elastic support structure includes two elastic plates 4, the front end of the elastic plate 4 is located in front of the rotating shaft 12 between the seat back frame 2 and the chassis 1, and the rear end is located between the seat back frame 2 and the chassis 1. The rear of the rotating shaft 12 between the chassis 1, wherein, the front end of the elastic plate 4 is fixedly connected with the chassis 1, and the back frame 2 is provided with a pressing part pressed on the rear end of the elastic plate 4; A fulcrum for supporting the elastic plate 4 is provided on the chassis 1 .

Referring to Figures 1 to 6, the elastic support structure also includes an elastic force adjustment mechanism, which includes a support block 8 and a push mechanism that pushes the support block 8 to move in the front and rear direction, wherein the support block 8 is arranged on the elastic plate On the chassis 1 between the front end and the rear end of 4, the lower surface of the elastic plate 4 is pressed against the support block 8, and the support block 8 constitutes the fulcrum. The working principle of the elastic force adjustment mechanism is that since the lower surface of the elastic plate 4 is pressed against the support block 8 to form a fulcrum, the position of the fulcrum of the elastic plate 4 can be changed by pushing the movement of the support block 8. According to the principle of leverage, the The closer the fulcrum is to the point of application of force (that is, the contact point between the pressing part and the elastic plate 4), the greater the elastic force that the elastic plate 4 can provide, thereby realizing the adjustment of the elastic force when the backrest 2 is reclined, so as to adapt to different user needs.

1 to 6, the pushing mechanism includes a worm gear mechanism, a screw drive mechanism and a hand wheel 9; wherein, the worm 5 in the worm gear mechanism is connected to the hand wheel 9, and the worm gear 6 is connected to the screw drive mechanism. The lead screw 7 in the mechanism is connected; the lead screw nut in the lead screw transmission mechanism is arranged on the support block 8, and the lead screw nut is formed by setting a screw thread 8-2 matched with the lead screw 7 in the support block 8; The hand wheel 9 is arranged on the side of the chassis 1, so as to be convenient for manual manipulation. The working principle of the pushing mechanism is: the rotation of the hand wheel 9 is transformed into the linear motion of the support block 8 through the transmission of the worm gear and screw drive mechanism in turn, thereby realizing the adjustment of the position of the support block 8 . In addition, the pushing mechanism can also adopt other mechanisms capable of pushing the support block 8 to move linearly, for example, directly adopt a screw drive mechanism, and the hand wheel is arranged on the screw.

Referring to Figures 1 to 6, in order to guide the movement of the support block 8, two guide grooves 8-3 are provided on the bottom surface of the support block 8, and the guide grooves 8-3 are matched with the guide grooves 8-3 provided on the chassis 1. rails. The support block 8 is provided with two raised portions 8-1 for supporting the two elastic plates 4, and the surface of the raised portions 8-1 is an arc surface, so that the elastic plates 4 are equivalent to being supported on the raised portions. On a line of part 8-1, the supporting effect is better.

Referring to Figures 1 to 6, the pressing portion is formed by a pressing plate 10 located at the bottom of the seat back frame 2, a cavity 11 is formed on the underside of the pressing plate 10, and the rear end of the elastic plate 4 extends into the cavity. In the cavity 11 (in FIG. 1, for the convenience of drawing, the rear end of the elastic plate 4 does not extend into the cavity 11, but is located on the upper side of the pressing plate 10. For this part, the text description shall prevail).

Referring to Figures 1 to 6, the working principle of the elastic support structure is: since the front end of the elastic plate 4 is fixed, the rear end is pressed by the pressing part of the seat back frame 2, and a fulcrum is arranged in the middle, when the seat back frame 2. When leaning back, the pressure-applying part exerts pressure on the rear end of the elastic plate 4, prompting the elastic plate 4 to elastically rotate around the fulcrum, thereby realizing the elastic support for the reclining of the seat back frame 2. The position of the support block 8 can be adjusted through the elastic force adjustment mechanism, thereby adjusting the size of the elastic force, which provides convenience for different users.

Below in conjunction with accompanying drawing, described backward position-limiting structure is described in detail:

Referring to Fig. 1 and Fig. 7 to Fig. 11, the reclining limit structure includes a locking mechanism provided on the chassis 1 and a locking groove 7-4b provided at the lower part of the seat back frame 2, wherein the locking mechanism It includes two locking blocks 5b and push blocks 4b, the two locking blocks 5b are arranged on both sides of the longitudinal centerline of the chassis 1, one end of each locking block b5 is connected to the chassis 1 through a rotating shaft, and the other end has The outwardly extending locking portion 5-1b. The locking block 5b is provided with a chute 5-2b, and the push block 4b is provided with a chute 5-2b that extends into the chute 5-2b and can push the locking block 5b to rotate so that the locking part 5-1b is inserted Or withdraw from the slide bar 4-1b of the locking groove 7-4b.

Referring to Fig. 1 and Fig. 7-11, the locking block is rectangular in shape, the front end extends outward to form a locking part 5-1b, and the rear end is provided with a connecting hole 5-3b for setting a rotating shaft. The chute 5-2b is inclined toward the outside of the longitudinal centerline of the locking block 5b, and the chute 5-2b on the two locking blocks 5b are combined together to form an "eight" shape, and the opening of the "eight" shape faces Front, when pushing the push block 4b to move forward, the locking block 5b turns inward, and the locking part 5-1b exits the locking groove 7-4b, and when pushing the push block 4b to move backward, the locking block 5b turns outward Turning, the locking part 5-1b exits the locking groove 7-4b. The locking and loosening between the locking part 5-1b and the locking groove 7-4b is realized by pushing the push block 4b back and forth, which has a simple structure and is easy to control. In order to guide and limit the movement of the locking block 5, the locking block 5b is provided with a guide hole 5-4b, and the chassis 1 is provided with a guide post 6b extending into the guide hole, and the locking When the block 5b rotates, the guide hole 5-4b moves along the guide column 6.

Referring to Figure 1 and Figures 7 to 11, the locking groove 7-4b is set on the connecting piece 7b used to connect the seat back frame 2 and the armrest, the connecting piece 7b includes the connecting plate 7-1b and the connecting plate 7-1b The armrest connection block 7-2b on the 7-1b and the seat back frame 2 connection block 7-3b; the locking groove 7-4b is arranged on the inner side of the connection plate 7-1b. There are multiple locking grooves 7-4b, which are arranged in the up-and-down direction around the rotation axis between the seat back frame 2 and the chassis 1, so that the backrest can be locked at different reclining angles. The locking grooves 7-4b 4b is an elongated slot, which matches the shape of the locking part 5-1b of the locking block 5b. Connect the seat back frame 2 and the armrest through the connecting piece 7b, which is convenient for assembly.

Referring to Figure 1 and Figures 7 to 11, the slide bar 4-1b is arranged on the lower side of both ends of the push block 4b, and the lower side of the push block 4b is also provided with a guide groove 4-2b, the guide groove 4-2 and The guide rails arranged on the chassis 1 are matched and connected, so as to facilitate the movement of the push block 4b to be guided.

Referring to Fig. 1 and Fig. 7-Fig. 11, a spring (not shown) is respectively provided at the front and rear ends of the push block 4b, wherein the elastic coefficient of the spring at the front end is greater than the elastic coefficient of the spring at the rear end, and the two springs are opposite to each other. The push block 4b generates an elastic force in the opposite direction, and the spring with a large elastic constant (the spring at the front end) generates an elastic force on the push block 4b to urge the locking portion 5-1b of the locking block 5b to insert into the locking groove 7-4b. The push block 4b is also provided with a pull rope for pulling the push block 4b to move.

Referring to Figure 1 and Figures 7 to 11, the push block 4b is in an elastic equilibrium state by setting two springs, and under the action of a spring with a large elastic coefficient, the locking part 5-1b is inserted into the locking groove 7 under normal conditions In -4b, the backrest cannot be reclined; and when it is necessary to recline, the push block 4b is pulled by the pull cord to overcome the elastic force of the spring with a large elastic coefficient to move the locking block 5b, and the locking part 5-1b moves from the locking groove 7- 4b, so that the backrest can be reclined. When reclined to a suitable angle, the stay rope is released, and the locking part 5-1b is reinserted in the locking groove 7-4b.

Describe in detail below in conjunction with accompanying drawing to described rake adjustment mechanism:

Referring to Fig. 1 and Fig. 12 to Fig. 17, the seat cushion rake adjustment mechanism includes a hinged mechanism arranged at the rear end of the cushion frame 3 and a lifting mechanism arranged at the front end of the seat cushion frame 3, wherein: the hinged mechanism is arranged at the rear end of the cushion frame 3 Between the rear end and the lower end of the chair back frame 2, the whole cushion frame 3 can rotate around the hinge mechanism. The lifting mechanism includes an intermediate hinge 4c, a slider 5c, and a positioning structure that can position the slider 5c at different positions in the up and down direction, wherein the upper end of the intermediate hinge 4c is hinged with the cushion frame 3, and the lower end is hinged with the slider 5c. Hinged, the positioning structure is arranged between the slider 5c and the chassis 1 .

Referring to Figure 1 and Figures 12 to 17, the positioning structure includes a plurality of positioning teeth 6-1c arranged on the chassis 1 along the up and down direction and a rotating chuck 8c provided on the slider 5c, wherein the One end of the rotating chuck 8c is provided with a bayonet 8-1c, and the middle part is connected with the slider 5c by a rotating shaft. The slider 5c is provided with a chuck mounting groove 5-1c for accommodating the rotating chuck 8c. The other end is provided with a spring that urges the locking tooth 8-1c to be locked on the positioning tooth 6-1c. One end of the spring is connected to the rotating chuck 8c, and the other end is connected to the sliding member 5c. The rotating chuck 8c and the sliding member 5c are respectively provided with connection holes 8-3c for connecting the spring. By allowing the locking teeth 8-1c of the rotating chuck 8c to be stuck on different positioning teeth 6-1c, the rotating chuck 8c is positioned at different heights, and then the front end of the cushion frame 3c is placed at different heights to adjust rake angle.

Referring to Figure 1 and Figures 12 to 17, the lifting mechanism is provided with an automatic reset mechanism, which includes a positioning groove 8-2c, Reset block 9c and vertical chute 6-2c, wherein, described vertical chute 6-2c is arranged on the chassis 1, and this vertical chute 6-2c is two; Described reset block 9c is provided with The sliding block 9-2c matched with the chute 6-2c and the positioning rod 9-1c matched with the positioning groove 8-2c; the stroke of the reset block 9c moving upward in the vertical chute 6-2c is less than The upward movement stroke of the sliding member 5c, the downward movement stroke of the reset block 9c in the vertical slide groove 6-2c is less than the downward movement stroke of the sliding member 5c. The purpose of setting the above-mentioned automatic reset mechanism is that when the rotating chuck 8c is stuck on a certain positioning tooth 6-1c, if the rotating chuck 8c is allowed to move downward to allow the seat cushion to rotate downward, due to the positioning tooth 6-1c It cannot be realized because of the blocking, and this problem can be solved by the automatic reset mechanism.

Referring to Figure 1 and Figures 12 to 17, the working principle of the above-mentioned automatic reset mechanism is: under normal conditions, the positioning rod 9-1c on the reset block 9c is located on the upper side of the positioning groove 8-2c of the rotating chuck 8c; the sliding part 5c Drive the rotating chuck 8c to move upwards, and the rotating chuck 8c also pushes the reset block 9c to move upward together. When the reset block 9c reaches the end of the stroke of the upward movement, it cannot continue to move, but at this time, the rotating chuck 8c can still continue to move upward. At this time, the positioning rod 9-1c on the reset block 9c overcomes the active force of the spring and is forcibly snapped into the positioning groove 8-2c of the rotating chuck 8c, thereby impelling the rotating chuck 8c to rotate at a certain angle, so that the rotating chuck The locking tooth 8-1c on the 8c breaks away from the positioning tooth 6-1c, and now the sliding part 5c and the rotating chuck 8c can move downward; At this time, the rotating chuck 8c can still continue to descend, and now the rotating chuck 8c overcomes the active force of the spring, impels the rotating chuck 8c to rotate a certain angle, and the positioning groove 8-2c forcibly leaves the described positioning rod 9-1c. The locking tooth 8-1 on the rotating chuck 8c can be snapped into the positioning tooth 6-1c again.

Referring to Fig. 1 and Fig. 12-17, the reset block 9c includes two sliding blocks 9-2c arranged at both ends and an extension plate extending downward, and the positioning rod 9-1c is arranged on the lower end of the extension plate. The sliding member 5c is provided with an accommodating cavity 5-2c for accommodating the reset block 9c.

Referring to Figure 1 and Figures 12 to 17, the chassis 1 is provided with an installation groove 1-1 corresponding to the lifting mechanism, and the installation groove 1-1 is provided with an installation box for accommodating the slider 5c. The positioning tooth 6-1c and the sliding groove 6-2c are arranged on the inner wall of the installation box. Specifically, the installation box is composed of a front box body 6c and a rear box body 7c, the upper parts of the front box body 6c and the rear box body 7c are fitted together, and in the fitting position, the rear box body 7c is located Above, the front box body 6c is located below, and the rear box body 7c is fixedly connected to the chassis 1, thereby also limiting the upward movement of the front box body 6c; the positioning teeth 6-1c and chute 6-2c are arranged on the front box body On the inner wall of the body 6c. This structure makes the assembly of the installation box and the assembly between the installation box and the chassis 1 easier.

The seat cushion leading edge position adjustment mechanism is described in detail below in conjunction with the accompanying drawings:

Referring to Fig. 1 and Fig. 18 to Fig. 22, the adjustment mechanism of the front edge position of the seat cushion of the present invention includes a bendable support adjustment assembly 2a, one end of the support adjustment assembly 2a is a fixed end, and the fixed end is fixed on the seat On the cushion frame 3, the other end is a movable end, and the movable end extends forward and bends and extends backward to be connected with the cushion frame 3, and the movable end is connected with the cushion frame 3 by a front and rear sliding mechanism.

Referring to Figure 1 and Figures 18 to 22, the front and rear sliding mechanism is composed of a sliding groove 3-2a and a sliding block 3a, wherein the sliding groove 3-2a is arranged on the cushion frame 3, and the sliding block 3a is matched with The sliding groove 3-2a is fixedly connected with the support adjustment assembly 2a; a positioning structure is provided between the sliding block 3a and the cushion frame 3. Specifically, the positioning structure is composed of a plurality of positioning recesses 3-3a provided on the cushion frame 3 and a positioning protrusion 3-1a matching the positioning recesses 3-3a provided on the sliding block 3a Every time the sliding block 3a slides for a certain distance, the positioning protrusion 3-1a will be stuck in the corresponding positioning recess 3-3a, thereby positioning the movable end of the support adjustment assembly 2a.

Referring to Figure 1 and Figures 18 to 22, the two sides of the fixed end of the support adjustment assembly 2a are respectively provided with a connector 2-1a, and the two sides of the cushion frame 3 are respectively provided with a connector 2-1a The matching connecting groove 3-1a, the connecting head 2-1a is embedded in the connecting groove 3-1a, and fixed by screws. Both sides of the cushion frame 3 are respectively provided with a slide groove 3-2a, the slide groove 3-2a is a slide groove through up and down. The connecting portion 2-2a of the groove 3-2a, the sliding block 3a is arranged on the upper side of the sliding groove 3-2a, and the sliding block 3a is fixedly connected with the connecting portion 2-2a by screws.

Referring to Figure 1 and Figures 18 to 22, the support adjustment assembly 2a is composed of two sides on both sides and a plurality of strips arranged in parallel between the two sides, so that the support adjustment assembly 2a forms Fence-like structure, easy to bend and save material.

Referring to Fig. 1 and Fig. 18 to Fig. 22, the working principle of the present utility model is: the curved part of the curved support adjustment assembly 2a constitutes the front edge of the seat cushion, and since the fixed end 2-3a of the support adjustment assembly 2a is fixed, the movable The end 2-4a is connected with the cushion frame 3 through the forward and backward sliding mechanism, so the movable end 2-4a can move along the front and rear directions, thereby the position of the front edge of the cushion can be adjusted.

The above is a preferred implementation of the utility model, but the implementation of the utility model is not limited by the above content, and any other changes, modifications, substitutions, combinations, Simplification should be equivalent replacement methods, all of which are included in the protection scope of the present utility model.

Claims (10)

1. A seat chassis structure, comprising a chassis, the chassis is provided with a cushion frame, and the lower end of the seat back frame is hinged on the chassis, it is characterized in that, the chassis is provided with an elastic support structure, a reclining position-limiting structure and Forward angle adjustment mechanism, in which: The elastic supporting structure includes at least one elastic plate, the front end of which is located in front of the rotating shaft between the seat back frame and the chassis, and the rear end is located behind the rotating shaft between the seat back frame and the chassis, wherein the The front end of the elastic plate is fixedly connected to the chassis, and the back frame is provided with a pressing part pressed against the rear end of the elastic plate; the chassis is provided with a fulcrum for supporting the elastic plate; The reclining limit structure includes a locking mechanism arranged on the chassis and a locking groove arranged at the lower part of the seat back frame, wherein the locking mechanism includes two locking blocks and a push block, and the two locking Tight blocks are arranged on both sides of the longitudinal centerline of the chassis, one end of each locking block is connected to the chassis through a rotating shaft, and the other end has a locking portion extending outward; the locking block is provided with a slide groove, and the The push block is provided with a slide bar that extends into the chute and can push the locking block to rotate so that the locking part is inserted into or withdrawn from the locking groove; The forward inclination adjustment mechanism includes a hinged mechanism arranged at the rear end of the cushion frame and a lifting mechanism arranged at the front end of the cushion frame, wherein the lifting mechanism includes an intermediate hinge, a sliding piece, and the sliding piece can be positioned at different positions in the up and down direction The positioning structure, wherein, the upper end of the intermediate hinge is hinged to the cushion frame, and the lower end is hinged to the slider, and the positioning structure is arranged between the slider and the chassis. 2. The seat chassis structure according to claim 1, further comprising a seat cushion front edge position adjustment mechanism, the seat cushion front edge position adjustment mechanism includes a bendable support adjustment assembly, one end of the support adjustment assembly is a fixed The fixed end is fixed on the cushion frame of the seat, and the other end is the movable end. The movable end extends forward and bends and then extends backward to connect with the cushion frame. The movable end and the cushion frame are connected by a front and rear sliding mechanism. . 3. The seat chassis structure according to claim 1, wherein the elastic support structure further comprises an elastic force adjustment mechanism, the elastic force adjustment mechanism includes a support block and a pushing mechanism that pushes the support block to move in the front and rear direction, wherein, The support block is arranged on the chassis between the front end and the rear end of the elastic plate, the lower surface of the elastic plate is pressed against the support block, and the support block constitutes the fulcrum. 4. The seat chassis structure according to claim 3, characterized in that, in the elastic support structure, the pushing mechanism comprises a worm gear transmission mechanism, a lead screw transmission mechanism and a hand wheel; wherein, the worm gear transmission mechanism The worm in the mechanism is connected with the hand wheel, and the worm wheel is connected with the lead screw in the lead screw transmission mechanism; the lead screw nut in the lead screw transmission mechanism is arranged on the support block. 5. The seat chassis structure according to claim 1, characterized in that, in the reclining limiting structure, the chute is inclined toward the outer side of the longitudinal centerline of the locking block, and the two locking blocks are The chutes are combined together in the shape of "eight"; the locking block is provided with a guide hole, and the chassis is provided with a guide column extending into the guide hole; On the connecting piece of the frame and the armrest, the connecting piece includes a connecting plate and an armrest connecting block and a seat back frame connecting block arranged on the connecting plate; the locking groove is arranged on the inner side of the connecting plate. 6. The seat chassis structure according to claim 5, wherein, in the reclining limit structure, a spring is respectively provided at the front and rear ends of the push block, and the elastic coefficient of one spring is greater than that of the other. The elastic coefficient of one spring, two springs produce the elastic force of opposite direction to push block, and the spring with large elastic coefficient produces the elastic force that impels the locking part of locking block to insert described locking groove to push block; Said push block There is a lifting rope on it. 7. The seat chassis structure according to claim 1, characterized in that, in the forward tilt adjustment mechanism, the positioning structure includes a plurality of positioning teeth arranged on the chassis along the up and down direction and a plurality of positioning teeth arranged on the sliding member. The rotary chuck on the upper side, wherein, one end of the rotary chuck is provided with a locking tooth, the middle part is connected with the sliding member through a rotating shaft, and the other end is provided with a spring that urges the locking tooth to be stuck on the positioning tooth. 8. Seat chassis structure according to claim 7, it is characterized in that, in described forward inclination adjustment mechanism, described lifting mechanism is provided with automatic reset mechanism, and this automatic reset mechanism includes being arranged in the rotating clamping head and clamping mechanism. Positioning slots, reset blocks and vertical chute on the opposite end of the teeth, wherein the vertical chute is arranged on the chassis, the reset block is provided with a slide block matching the chute and the positioning The positioning rod matched with the groove; the stroke of the upward movement of the reset block in the vertical chute is less than the upward movement of the slider, and the downward movement of the reset block in the vertical chute is less than the downward movement of the slider itinerary. 9. The seat chassis structure according to claim 2, wherein, in the seat cushion front edge position adjustment mechanism, the front and rear sliding mechanism is composed of a sliding groove and a sliding block, wherein the sliding groove is arranged on the seat cushion On the frame, the sliding block is matched in the sliding groove and is fixedly connected with the support adjustment assembly; a positioning structure is provided between the sliding block and the cushion frame. 10. The seat chassis structure according to claim 9, wherein the positioning structure is composed of a plurality of positioning dimples provided on the cushion frame and matching dimples provided on the sliding block The positioning protrusion is formed.