An adjustment mechanism for the angle of the half basin linked with the height adjustment of the seat

Abstract

The present invention discloses an adjustment mechanism for a half-basin angle that is linked with the seat height adjustment, including a seat height adjustment component and a connecting rod component, wherein the half-basin is connected to the front of the seat height adjustment component through the connecting rod component; wherein the seat height adjustment component includes a pair of left-right symmetrical cushion side beams, a pair of left-right symmetrical front height adjustment connecting rods, a rear height adjustment tooth plate, a rear height adjustment connecting rod, a height adjustment motor, a height adjustment motor bracket, a pair of left-right symmetrical seat height adjustment mechanism brackets, a rear cross tube and a plurality of connecting pieces; the connecting rod component includes two half-basin inclination adjustment linkage plates and two half-basin linkage brackets. The present invention has a compact structure, reduces the use of one motor, reduces costs, reduces weight, and expands the layout space of other functional mechanisms; by adjusting the conventional four-bar linkage mechanism under the seat, the linkage four-bar linkage mechanism under the half-basin is driven to move, thereby realizing the function of adjusting the seat height and the half-basin inclination at the same time.

Description

Technical Field

[0001] The invention relates to the technical field of automobile seats, and in particular to an adjustment mechanism for a half-basin angle linked with seat height adjustment. Background Art

[0002] like Figure 1 As shown, it is a structural diagram of the half-basin adjustment mechanism of the prior art, the screw bracket 16 is welded to the front cross tube 17, and the front cross tube 17 is welded between the right seat cushion side beam 2a and the left seat cushion side beam 2b; the height adjustment motor bracket 7 is welded to the transverse curved tube 18, and the front ends of the right seat cushion side beam 2a and the left seat cushion side beam 2b are installed with a transverse curved tube 18 through bolts 19 and bushings, and can move around the bolts 19 as the rotation center; the screw motor 20 is clamped into the installation groove of the height adjustment motor bracket 7, and the rear end of the motor screw is installed on the screw bracket 16 through the connecting bolt 22; finally, the rear end of the half basin 1 is installed on the right seat cushion side beam 2a and the left seat cushion side beam 2b through two step bolts 15 and bushings, and the front end of the half basin 1 is fixed to the transverse curved tube 18 through two front curved tube plastic brackets 21. When in use, the screw motor 20 is driven to rotate upward around the connecting bolt 22, and the motor body drives the height adjustment motor bracket 7 and the front cross pipe 17 to move upward around the bolt 19 as the rotation center, thereby driving the half basin 1 to be lifted upward around the half basin step bolt 15 as the rotation center, thereby realizing the half basin inclination adjustment function. In this structure, the rotation of the half basin is driven by a separate screw motor.

[0003] With the development of the automobile industry, the functions that automobile seats can achieve are increasing, and the parts are also simplified, thereby reducing the weight of the entire seat and improving the working efficiency of the automobile. The existing seats with half-basin angle adjustment mechanisms, such as the half-basin tilt adjustment mechanism shown above, and the technologies disclosed in patents CN206543066U and CN206633849U, are mostly implemented by screw motors, which have the disadvantages of "the motor mass is large, which reduces the working efficiency of the automobile; and the motor is large in size, occupies a large space, which is not conducive to the arrangement of other functional mechanisms".

[0004] Therefore, in order to overcome the above problems, the present invention proposes an adjustment mechanism for the half-basin angle that is linked to the seat height adjustment. The half-basin does not need to be driven by a screw motor, but is instead linked to the seat's four-link height adjustment mechanism. A four-link mechanism is added to the front link of the height adjustment mechanism to achieve the function of simultaneously adjusting the half-basin inclination angle and the seat height. Summary of the invention

[0005] The purpose of the present invention is to provide an adjustment mechanism for the half-basin angle which is linked with the seat height adjustment, so as to solve the problem that the half-basin adjustment is achieved by relying on a screw motor in the prior art, and the motor is large in size and occupies a large space.

[0006] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0007] The present invention discloses a mechanism for adjusting the angle of a half basin in linkage with the height adjustment of a seat, comprising a seat height adjustment component and a connecting rod component, wherein the half basin is connected to the front of the seat height adjustment component through the connecting rod component;

[0008] The seat height adjustment assembly includes a pair of left-right symmetrical seat cushion side beams, a pair of left-right symmetrical front height adjustment connecting rods, a rear height adjustment tooth plate, a rear height adjustment connecting rod, a height adjustment motor, a height adjustment motor bracket, a pair of left-right symmetrical seat height adjustment mechanism brackets, a rear cross tube and a plurality of connecting parts; the rear cross tube is positioned and connected between the right seat cushion side beam and the left seat cushion side beam, the upper end of the rear height adjustment tooth plate and one end of the rear height adjustment connecting rod are respectively welded to the left and right ends of the rear cross tube, the lower end of the rear height adjustment tooth plate is connected to the rear end of the left seat height adjustment mechanism bracket, and the other end of the rear height adjustment connecting rod is connected to the right seat The rear end of the height adjustment mechanism bracket is connected; the height adjustment motor is positioned through the mounting hole on the left seat cushion side beam, and the rear end of the height adjustment motor passes through the crescent groove on the rear height adjustment gear plate and is connected to one end of the height adjustment motor bracket, and the other end of the height adjustment motor bracket is fastened to the inner side surface of the left seat cushion side beam; the lower end of the right front height adjustment connecting rod is connected to the front end of the right seat height adjustment mechanism bracket, the upper end of the right front height adjustment connecting rod is riveted to the front end of the right seat cushion side beam, the lower end of the left front height adjustment connecting rod is connected to the front end of the left seat height adjustment mechanism bracket, and the upper end of the left front height adjustment connecting rod is riveted to the front end of the left seat cushion side beam;

[0009] The connecting rod assembly includes two half-basin inclination adjustment linkage plates, a right half-basin linkage bracket and a left half-basin linkage bracket; the lower ends of the two half-basin inclination adjustment linkage plates are riveted to the right front height adjustment link and the left front height adjustment link respectively, and the upper ends of the two half-basin inclination adjustment linkage plates are riveted to the right half-basin linkage bracket and the left half-basin linkage bracket respectively; one end of the horizontal plane of the right half-basin linkage bracket and the left half-basin linkage bracket is connected to the front end of the half-basin, and the rear end of the half-basin is connected to the seat cushion side beam through the half-basin step bolts and bushings.

[0010] Preferably, the lower end of the rear height adjusting gear plate is connected to the rear end of the left seat height adjusting mechanism bracket through a first step bolt, and the other end of the rear height adjusting connecting rod is connected to the rear end of the right seat height adjusting mechanism bracket through a first step bolt; the lower end of the right front height adjusting connecting rod is connected to the front end of the right seat height adjusting mechanism bracket through a second step bolt, and the lower end of the left front height adjusting connecting rod is connected to the front end of the left seat height adjusting mechanism bracket through the second step bolt; the upper end of the right front height adjusting connecting rod is riveted to the front end of the right seat cushion side beam through the first blind rivet, and the upper end of the left front height adjusting connecting rod is riveted to the front end of the left seat cushion side beam through the first blind rivet.

[0011] Preferably, the lower ends of the two half-basin inclination adjustment linkage plates are riveted to the right front height adjustment link and the left front height adjustment link respectively through the third blind rivet, and the upper ends of the two half-basin inclination adjustment linkage plates are riveted to the right half-basin linkage bracket and the left half-basin linkage bracket respectively through the second blind rivet. One end of the horizontal plate of the right half-basin linkage bracket and the left half-basin linkage bracket is connected to the half-basin through the lifting mechanism screw.

[0012] Preferably, the right half-basin linkage bracket and the left half-basin linkage bracket are arranged symmetrically on the left and right, and include a bent vertical plate and a horizontal plate. Each of the horizontal plates is connected to the front bottom surface of the half-basin through two of the lifting mechanism screws, and each of the vertical plates is riveted to the half-basin inclination adjustment linkage plate through a second blind rivet.

[0013] Preferably, the seat height adjustment assembly includes a conventional four-bar linkage, the rotation points of which include the rear cross tube, the first step bolt, the second step bolt and the first blind rivet; the lower part of the half basin includes a linked four-bar linkage, the rotation points of which include the half basin step bolt, the second step bolt, the third blind rivet and the second blind rivet, and the relative positions of the connecting rod from the second step bolt to the first blind rivet and the connecting rod from the third blind rivet to the second step bolt are fixed.

[0014] Preferably, when in the middle position, the height adjustment motor drives the rear height adjustment gear plate to rotate clockwise around the first step bolt, and the conventional four-bar linkage transmission drives the front height adjustment link to rotate clockwise around the second step bolt, and the top seat cushion side beam is lifted; the front height adjustment link drives the half-basin inclination adjustment linkage plate to move forward and upward around the third blind rivet, and the linkage four-bar linkage transmission drives the second step bolt to move forward, and the half-basin rotates downward clockwise around the half-basin step bolt as the center, and the inclination angle of the half-basin becomes smaller.

[0015] Compared with the prior art, the beneficial technical effects of the present invention are:

[0016] The present invention discloses an adjustment mechanism for a half-basin angle that is linked with the seat height adjustment, comprising a seat height adjustment component and a connecting rod component, wherein the half-basin is connected to the front of the seat height adjustment component through the connecting rod component; wherein the seat height adjustment component comprises a pair of left-right symmetrical seat cushion side beams, a pair of left-right symmetrical front height adjustment connecting rods, a rear height adjustment tooth plate, a rear height adjustment connecting rod, a height adjustment motor, a height adjustment motor bracket, a pair of left-right symmetrical seat height adjustment mechanism brackets, a rear cross tube and a plurality of connecting parts, wherein the rear cross tube, the first step bolt, the second step bolt and the first blind rivet rotation point form a conventional four-bar linkage; the connecting rod assembly comprises two half-basin inclination adjustment linkage plates, a right half-basin linkage bracket and a left half-basin linkage bracket, and a linkage four-bar linkage mechanism is included below the half-basin, and a linkage four-bar linkage mechanism is formed through four rotation points of the half-basin step bolt, the second step bolt, the third blind rivet and the second blind rivet, and the relative positions of the connecting rods from the second step bolt to the first blind rivet and from the third blind rivet to the second step bolt in the two four-bar linkage mechanisms are fixed. During operation, taking the middle position as an example, the height adjustment motor drives the rear height adjustment tooth plate to rotate clockwise around the first step bolt, and the conventional four-bar linkage transmission drives the front height adjustment connecting rod to rotate clockwise around the second step bolt; the front height adjustment connecting rod drives the half-basin inclination adjustment linkage plate to move forward and upward around the third blind rivet, and the linkage four-bar linkage transmission drives the second step bolt forward, and the half-basin rotates downward clockwise around the half-basin step bolt as the center, the seat rises, and the inclination angle of the half-basin becomes smaller; conversely, when the height adjustment motor drives the rear height adjustment tooth plate to rotate counterclockwise around the first step bolt, the seat is lowered and the inclination angle of the half-basin becomes larger.

[0017] Compared with the existing half-basin inclination angle adjustment mechanism, the present invention has a compact structure, reduces the use of one motor, reduces costs, reduces weight, has a simple structure, and expands the layout space of other functional mechanisms; by adjusting the conventional four-bar linkage mechanism under the seat to drive the linkage four-bar linkage mechanism under the half-basin to move, the function of simultaneously adjusting the seat height and the half-basin inclination angle is realized.

[0018] The present invention meets the driving habits of drivers of different heights. Usually, short drivers need to adjust the seat to the highest position before driving. At this time, the present invention can realize that the half-basin inclination angle becomes smaller with movement, leaving effective space for the soles of the feet to touch the three pedals. Tall drivers need to adjust the seat to the lowest position when driving. At this time, the thighs will rise, the contact area between the thighs and the seat cushion will decrease, the pressure on the buttocks will increase, and the comfort will deteriorate. At this time, the present invention can realize that the half-basin inclination angle becomes larger with movement, effectively compensating for the angle difference, increasing the contact area between the thighs and the seat cushion, and improving comfort. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The present invention will be further described below in conjunction with the accompanying drawings.

[0020] Figure 1 It is a schematic diagram of the prior art structure;

[0021] Figure 2 It is a schematic diagram of the adjustment mechanism of the half basin angle according to the present invention in linkage with the seat height adjustment;

[0022] Figure 3 It is a cross-sectional view of the AA position of the present invention;

[0023] Figure 4 This is a schematic diagram of the installation of the left side of the half basin of the present invention; (the right side of the half basin is symmetrical to the left side)

[0024] Figure 5 This is a schematic diagram of the installation of the rear connecting rod of the present invention;

[0025] Figure 6 This is a schematic diagram of the highest position of the seat height adjustment mechanism of the present invention;

[0026] Figure 7 This is a schematic diagram of the lowest position of the seat height adjustment mechanism of the present invention;

[0027] Figure 8 This is an exploded view of the adjustment mechanism of the half-basin angle according to the seat height adjustment of the present invention;

[0028] Description of the accompanying drawings: 1, half basin; 2a, right side beam of seat cushion; 2b, left side beam of seat cushion; 3a, right front height-adjusting connecting rod; 3b, left front height-adjusting connecting rod; 4, rear height-adjusting gear plate; 5, rear height-adjusting connecting rod; 6, height-adjusting motor; 7, height-adjusting motor bracket; 8a, right seat height-adjusting mechanism bracket; 8b, left seat height-adjusting mechanism bracket; 9, half basin inclination adjustment linkage plate; 10a, right half basin linkage bracket; 10b, left half basin linkage bracket; 11, rear cross tube; 12a, first step bolt; 12b, second step bolt; 13a, first blind rivet; 13b, second blind rivet; 13c, third blind rivet; 14, lifting mechanism screw; 15, half basin step bolt;

[0029] 16. Screw bracket; 17. Front cross pipe; 18. Cross bend pipe; 19. Bolts; 20. Screw motor; 21. Plastic bracket; 22. Connecting bolts. DETAILED DESCRIPTION

[0030] like Figure 2-8As shown, a half-basin angle adjustment mechanism that is linked with the seat height adjustment comprises a seat height adjustment component and a connecting rod component, wherein the half-basin 1 is connected to the front of the seat height adjustment component through the connecting rod component; specifically, the seat height adjustment component comprises a pair of left-right symmetrical seat cushion side beams, a pair of left-right symmetrical front height adjustment connecting rods, a rear height adjustment tooth plate 4, a rear height adjustment connecting rod 5, a height adjustment motor 6, a height adjustment motor bracket 7, a pair of left-right symmetrical seat height adjustment mechanism brackets, a rear cross tube 11 and a plurality of connecting parts; the rear cross tube 11 is positioned and connected between the right seat cushion side beam 2a and the left seat cushion side beam 2b, the upper end of the rear height adjustment tooth plate 4 and one end of the rear height adjustment connecting rod 5 are respectively welded to the left and right ends of the rear cross tube 11, and the lower end of the rear height adjustment tooth plate 4 is welded to the left seat height adjustment motor bracket 7. The rear end of the rear height adjusting link 5 is connected to the rear end of the right seat height adjusting mechanism bracket 8b; the height adjusting motor 6 is positioned through the mounting hole on the left seat cushion side beam 2b, and the rear end of the height adjusting motor 6 passes through the crescent groove on the rear height adjusting gear plate 4 and is connected to one end of the height adjusting motor bracket 7, and the other end of the height adjusting motor bracket 7 is fastened to the inner side surface of the left seat cushion side beam 2b; the lower end of the right front height adjusting link 3a is connected to the front end of the right seat height adjusting mechanism bracket 8a, the upper end of the right front height adjusting link 3a is riveted to the front end of the right seat cushion side beam 2a, the lower end of the left front height adjusting link 3b is connected to the front end of the left seat height adjusting mechanism bracket 8b, and the upper end of the left front height adjusting link 3b is riveted to the front end of the left seat cushion side beam 2b.

[0031] like Figure 3 , 4 As shown, the connecting rod assembly includes two half-basin inclination adjustment linkage plates 9, a right half-basin linkage bracket 10a and a left half-basin linkage bracket 10b; the lower ends of the two half-basin inclination adjustment linkage plates 9 are riveted to the right front height adjustment link 3a and the left front height adjustment link 3b respectively, and the upper ends of the two half-basin inclination adjustment linkage plates 9 are riveted to the right half-basin linkage bracket 10a and the left half-basin linkage bracket 10b respectively; one end of the horizontal plane of the right half-basin linkage bracket 10a and the left half-basin linkage bracket 10b is connected to the front end of the half-basin 1, and the rear end of the half-basin 1 is connected to the seat cushion side beam through the half-basin step bolt 15 and the bushing.

[0032] Specifically, the lower end of the rear height adjustment gear plate 4 is connected to the rear end of the left seat height adjustment mechanism bracket 8b through the first step bolt 12a, and the other end of the rear height adjustment connecting rod 5 is connected to the rear end of the right seat height adjustment mechanism bracket 8a through the first step bolt 12a; the lower end of the right front height adjustment connecting rod 3a is connected to the front end of the right seat height adjustment mechanism bracket 8a through the second step bolt 12b, and the lower end of the left front height adjustment connecting rod 3b is connected to the front end of the left seat height adjustment mechanism bracket 8b through the second step bolt 12b; the upper end of the right front height adjustment connecting rod 3a is riveted to the front end of the right seat cushion side beam 2a through the first blind rivet 13a, and the upper end of the left front height adjustment connecting rod 3b is riveted to the front end of the left seat cushion side beam 2b through the first blind rivet 13a.

[0033] Specifically, the lower ends of the two half-basin tilt adjustment linkage plates 9 are riveted to the right front height adjustment link 3a and the left front height adjustment link 3b respectively through the third blind rivet 13c, and the upper ends of the two half-basin tilt adjustment linkage plates 9 are riveted to the right half-basin linkage bracket 10a and the left half-basin linkage bracket 10b respectively through the second blind rivet 13b. One end of the horizontal plate of the right half-basin linkage bracket 10a and the left half-basin linkage bracket 10b is connected to the half-basin 1 through the lifting mechanism screw 14. The right half-basin linkage bracket 10a and the left half-basin linkage bracket 10b are arranged symmetrically on the left and right, and include a vertical plate and a horizontal plate formed by bending. Each of the horizontal plates is connected to the bottom surface of the front end of the half-basin 1 through the two lifting mechanism screws 14, and each of the vertical plates is riveted to the half-basin tilt adjustment linkage plate through a second blind rivet 13b.

[0034] The combined mechanism includes two four-bar mechanisms, wherein the seat height adjustment assembly includes a conventional four-bar mechanism, the rotation points of which include the rear cross tube 11, the first step bolt 12a, the second step bolt 12b and the first blind rivet 13a; the lower part of the half basin includes a linked four-bar mechanism, the rotation points of which include the half basin step bolt 15, the second step bolt 12b, the third blind rivet 13c and the second blind rivet 13b, and the relative positions of the connecting rod from the second step bolt 12b to the first blind rivet 13a and the connecting rod from the third blind rivet 13c to the second step bolt 12b are fixed.

[0035] The action process of the present invention is as follows:

[0036] When working, Figure 6 , 7As shown, taking the middle position as an example, the height adjustment motor 6 drives the rear height adjustment gear plate 4 to rotate clockwise around the first step bolt 12a, and the conventional four-bar linkage transmission drives the front height adjustment link to rotate clockwise around the second step bolt 12b. At this time, the right seat cushion side beam 2a and the left seat cushion side beam 2b are lifted, and the seat is raised; the front height adjustment link drives the half-basin inclination adjustment linkage plate 9 to move forward and upward around the third blind rivet 13c, and the linkage four-bar linkage transmission drives the second step bolt 12b to move forward, and the half-basin 1 rotates downward clockwise around the half-basin step bolt 15 as the center, and the inclination angle of the half-basin 1 becomes smaller, which is suitable for taller people to drive and ride.

[0037] On the contrary, taking lowering the seat height in the middle position as an example, the height adjustment motor 6 drives the rear height adjustment gear plate 4 to rotate counterclockwise around the first step bolt 12a, and the conventional four-bar linkage transmission drives the front height adjustment link to rotate counterclockwise around the second step bolt 12b. At this time, the right seat cushion side beam 2a and the left seat cushion side beam 2b drop, and the seat height is lowered; the front height adjustment link drives the half-basin inclination adjustment linkage plate 9 to move backward and downward around the third blind rivet 13c, and the linkage four-bar linkage transmission drives the second step bolt 12b to move backward, and the half-basin 1 rotates counterclockwise downward with the half-basin step bolt 15 as the center, and the inclination angle of the half-basin 1 becomes larger, which is suitable for shorter people to drive and ride.

[0038] Through the above linkage operation, when a shorter person is driving, the inclination angle of the half basin becomes smaller, leaving effective space for the soles of the feet to touch the three pedals; tall drivers need to adjust the height to the lowest, at which time the thigh angle is reduced, the contact area between the thigh and the seat cushion is reduced, the pressure is increased, and the comfort becomes worse. At this time, the inclination angle of the half basin becomes larger, which effectively compensates for the angle difference, increases the contact area, and improves comfort.

[0039] The present invention adds a set of linked four-bar linkage mechanisms to the front height-adjusting link of the conventional four-bar linkage mechanism under the seat, so as to realize the simultaneous adjustment of the seat height and the half-basin inclination angle; the mechanism is mainly used on seats with a mechanism for simultaneously adjusting the seat height and the half-basin inclination angle; in addition, the seat height and the half-basin inclination angle can be adjusted manually at the same time without a motor; a half-basin inclination angle adjustment motor can be saved, thereby reducing weight, reducing costs, and increasing the installation space for other functional mechanisms.

[0040] The embodiments described above are only descriptions of the preferred modes of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should all fall within the protection scope determined by the claims of the present invention.

Claims

1. A mechanism for adjusting the angle of a half basin in conjunction with the height adjustment of a seat, characterized in that: It includes a seat height adjustment component and a connecting rod component, wherein the half basin is connected to the front of the seat height adjustment component through the connecting rod component; The seat height adjustment assembly includes a pair of left-right symmetrical cushion side beams, a pair of left-right symmetrical front height adjustment connecting rods, a rear height adjustment tooth plate, a rear height adjustment connecting rod, a height adjustment motor, a height adjustment motor bracket, a pair of left-right symmetrical seat height adjustment mechanism brackets, a rear cross tube and multiple connecting parts; a rear cross tube is positioned and connected between the right cushion side beam and the left cushion side beam, the upper end of the rear height adjustment tooth plate and one end of the rear height adjustment connecting rod are respectively welded to the left and right ends of the rear cross tube, the lower end of the rear height adjustment tooth plate is connected to the rear end of the left seat height adjustment mechanism bracket, and the other end of the rear height adjustment connecting rod is connected to the rear end of the right seat height adjustment mechanism bracket; the height adjustment motor is positioned through the mounting hole on the left cushion side beam, the rear end of the height adjustment motor passes through the crescent groove on the rear height adjustment tooth plate and is connected to one end of the height adjustment motor bracket, and the other end of the height adjustment motor bracket is fastened to the inner side surface of the left cushion side beam; The lower end of the right front height adjustment link is connected to the front end of the right seat height adjustment mechanism bracket, the upper end of the right front height adjustment link is riveted to the front end of the right seat cushion side beam, the lower end of the left front height adjustment link is connected to the front end of the left seat height adjustment mechanism bracket, and the upper end of the left front height adjustment link is riveted to the front end of the left seat cushion side beam; The connecting rod assembly includes two half-basin tilt adjustment linkage plates, a right half-basin linkage bracket and a left half-basin linkage bracket; the lower ends of the two half-basin tilt adjustment linkage plates are riveted to the right front height adjustment link and the left front height adjustment link respectively, and the upper ends of the two half-basin tilt adjustment linkage plates are riveted to the right half-basin linkage bracket and the left half-basin linkage bracket respectively; one end of the horizontal plane of the right half-basin linkage bracket and the left half-basin linkage bracket is connected to the front end of the half-basin, and the rear end of the half-basin is connected to the cushion side beam through the half-basin step bolts and bushings; The lower end of the rear height adjustment gear plate is connected to the rear end of the left seat height adjustment mechanism bracket through the first step bolt, and the other end of the rear height adjustment connecting rod is connected to the rear end of the right seat height adjustment mechanism bracket through the first step bolt; the lower end of the right front height adjustment connecting rod is connected to the front end of the right seat height adjustment mechanism bracket through the second step bolt, and the lower end of the left front height adjustment connecting rod is connected to the front end of the left seat height adjustment mechanism bracket through the second step bolt; the upper end of the right front height adjustment connecting rod is riveted to the front end of the right seat cushion side beam through the first blind rivet, and the upper end of the left front height adjustment connecting rod is riveted to the front end of the left seat cushion side beam through the first blind rivet; The seat height adjustment assembly includes a conventional four-bar linkage, the rotation points of which include the rear cross tube, the first step bolt, the second step bolt and the first blind rivet; the lower part of the half basin includes a linked four-bar linkage, the rotation points of which include the half basin step bolt, the second step bolt, the third blind rivet and the second blind rivet, and the relative positions of the connecting rod from the second step bolt to the first blind rivet and the connecting rod from the third blind rivet to the second step bolt are fixed.

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