Lightweight automobile seat mounting bracket

Abstract

The utility model discloses a kind of light-weight automobile seat mounting bracket, specifically related to automobile seat support technical field, including lower body seat mounting bracket, angle adjusting mechanism is provided on lower body seat mounting bracket, seat backrest mounting bracket is provided on angle adjusting mechanism, the lower end of lower body seat mounting bracket is installed with multiple lower mounting plate, the lower end of lower mounting plate is installed with two fixed blocks, pivot is installed between two fixed blocks, lower cover wire frame is installed on the outside of pivot, the surface of lower cover wire frame is provided with a plurality of first wire slot, framework reinforcing mechanism is provided on lower body seat mounting bracket and seat backrest mounting bracket, two upper mounting plates are provided on supporting mechanism, the surface of upper mounting plate is provided with upper cover wire frame, the surface of upper cover wire frame is provided with a plurality of second wire slot. The utility model is equipped with the wire slot cover that can open and close, with soft pad protection wire harness wear and tear and loosening, and can be flexibly wired from special slot, maintenance can be carried out by flip plug.

Description

Technical Field

[0001] This utility model relates to the field of automotive seat bracket technology, and more specifically, to a lightweight automotive seat mounting bracket. Background Technology

[0002] Car seats are one of the most important components of a vehicle. Besides providing comfort, they are also crucial safety features, ensuring occupant safety in frontal, side, and rear-end collisions. This necessitates sufficient rigidity and strength in the seat's frame system. Currently, driven by the need for energy conservation and emission reduction in the automotive industry, lightweighting has become a significant driving force for the continued development of car seat frames. Common lightweight car seat mounting brackets can only reduce the weight of the entire seat and ensure its strength. In practical applications, various components need to be added to the seat, and the connecting wires of these components are fixed to the seat bracket by binding. However, binding the wire harness for too long can lead to breakage and short circuit. Moreover, removing the binding tape is very troublesome during maintenance and disassembly, ultimately resulting in a reduction in the lifespan of the wire harness and the ease of installation and removal.

[0003] In summary, to improve the lifespan and ease of installation and removal of wire harnesses, it is necessary to address the issues of reduced wire harness lifespan and ease of installation and removal, making the method of fixing the wire harness more convenient, preventing damage to the wire harness itself, and allowing for fixing according to the direction of the wire harness. Summary of the Invention

[0004] The present invention provides a lightweight car seat mounting bracket, which aims to solve the problem that: the wiring harness may break and short-circuit if it is tied for too long, and the removal of the ties is very troublesome during maintenance and disassembly.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a lightweight car seat mounting bracket, including a lower seat mounting bracket, an angle adjustment mechanism on the lower seat mounting bracket, a seat back mounting bracket on the angle adjustment mechanism, multiple lower mounting plates on the lower end of the lower seat mounting bracket, two fixing blocks on the lower end of the lower mounting plates, a rotating shaft between the two fixing blocks, a lower cover wire frame on the outer side of the rotating shaft, multiple first wire outlet grooves on the surface of the lower cover wire frame, a skeleton reinforcement mechanism on the lower seat mounting bracket and the seat back mounting bracket, two upper mounting plates on the support mechanism, an upper cover wire frame on the surface of the upper mounting plate, and multiple second wire outlet grooves on the surface of the upper cover wire frame.

[0006] In a preferred embodiment, elastic pressure pads are installed on the inner sides of both the first and second cable outlet slots. Locking mechanisms are provided on the lower and upper cover cable frames. The locking mechanisms are used to fix the positions of the lower and upper cover cable frames. The locking mechanisms include a snap-fit ​​assembly and a plug-in assembly. The snap-fit ​​end of the snap-fit ​​assembly is connected to the lower mounting plate and is used to fix the position of the lower cover cable frame. The plug-in end of the plug-in assembly is connected to the upper mounting plate and is used to fix the position of the upper cover cable frame.

[0007] In a preferred embodiment, the snap-fit ​​assembly includes two lower snap-fit ​​slots formed on the surface of the lower mounting plate and two snap-fit ​​blocks mounted on the surface of the lower cover frame.

[0008] In a preferred embodiment, the plug-in assembly includes a plurality of upper plug-in slots formed on the surface of the upper mounting plate and a plurality of plug-in blocks mounted on the surface of the upper cover frame.

[0009] In a preferred embodiment, the frame reinforcement mechanism is used to support the body of the occupant. The frame reinforcement mechanism includes a body support assembly for supporting the body of the occupant and a frame support assembly for securing the bracket to the installation location on the vehicle.

[0010] In a preferred embodiment, the body support assembly includes a plurality of backrest support strips mounted on the surface of the seat back mounting bracket and a plurality of hip and leg support strips mounted on the upper end of the lower body seat mounting bracket, with the upper mounting plate fixedly connected to the backrest support strips.

[0011] In a preferred embodiment, the frame support assembly includes four rectangular support bases mounted on the lower end of the lower seat mounting bracket and connecting rods mounted on the surfaces of two support bases.

[0012] In a preferred embodiment, the connecting end of the angle adjustment mechanism is connected to the seat back mounting bracket. The angle adjustment mechanism is used to adjust the angle of the seat back mounting bracket. The angle adjustment mechanism includes a first rotating component and a second rotating component. The connecting end of the first rotating component is connected to the seat back mounting bracket. The first rotating component is used to install a rotational power device. The connecting end of the second rotating component is connected to the seat back mounting bracket. The second rotating component is used to rotatably connect the lower seat mounting bracket and the seat back mounting bracket.

[0013] In a preferred embodiment, the first rotating assembly includes a power mounting plate mounted on the upper end of the lower seat mounting bracket and a first rotating connecting plate rotatably connected to the surface of the power mounting plate, the first rotating connecting plate being connected to the seat back mounting bracket.

[0014] In a preferred embodiment, the second rotating assembly includes a fixed side plate mounted on the upper end of the lower seat mounting bracket and a second rotating connecting plate rotatably connected to the surface of the fixed side plate, the second rotating connecting plate being connected to the seat back mounting bracket.

[0015] The beneficial effects of this utility model are as follows: This invention adds openable cable tray covers to the base and backrest of the seat bracket. This protects various connecting wires from being scratched by the edges of the bracket, and allows wires with different directions to pass smoothly through the special slots on the covers. The bottom cable tray cover can be easily opened, and the backrest cable tray cover can be easily plugged in and unplugged. During maintenance, there is no need to cut the tightly tied cable ties. You can easily check or organize the wiring inside with a simple flip and pull. At the same time, the soft rubber strip inside the slot of the cover can firmly press down the wires to prevent them from being pulled and damaged by the bumps during driving. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall front view of the present invention.

[0017] Figure 2 This is a schematic diagram of the overall bottom view of the present invention.

[0018] Figure 3 This is a schematic diagram of the support structure of this utility model.

[0019] Figure 4 This is an exploded view of the backrest cable harness assembly of this utility model.

[0020] Figure 5 This is an exploded view of the hip harness assembly of this utility model.

[0021] The attached figures are labeled as follows: 1. Lower seat mounting bracket; 11. Seat back mounting bracket; 12. Lower mounting plate; 13. Fixing block; 14. Rotating shaft; 15. Lower cover wire frame; 16. First cable outlet groove; 17. Upper mounting plate; 18. Upper cover wire frame; 19. Second cable outlet groove; 20. Elastic pressure pad; 311. Lower snap-fit ​​groove; 312. Snap-fit ​​block; 321. Upper insertion groove; 322. Insertion block; 411. Backrest support strip; 412. Hip and leg support strip; 421. Support seat; 422. Connecting rod; 511. Power mounting plate; 512. First rotating connecting plate; 521. Fixed side plate; 522. Second rotating connecting plate. Detailed Implementation

[0022] The present application will now be described in further detail with reference to the accompanying drawings. It should be noted that the following specific embodiments are only used to further illustrate the present application and should not be construed as limiting the scope of protection of the present application. Those skilled in the art can make some non-essential improvements and adjustments to the present application based on the above application content.

[0023] Refer to the instruction manual appendix Figures 1 to 5 A lightweight car seat mounting bracket includes a lower seat mounting bracket 1, an angle adjustment mechanism on the lower seat mounting bracket 1, a seat back mounting bracket 11 on the angle adjustment mechanism, multiple lower mounting plates 12 on the lower end of the lower seat mounting bracket 1, two fixing blocks 13 on the lower end of the lower mounting plates 12, a rotating shaft 14 between the two fixing blocks 13, a lower cover wire frame 15 on the outer side of the rotating shaft 14, multiple first wire outlet grooves 16 on the surface of the lower cover wire frame 15, a skeleton reinforcement mechanism on the lower seat mounting bracket 1 and the seat back mounting bracket 11, two upper mounting plates 17 on the support mechanism, an upper cover wire frame 18 on the surface of the upper mounting plate 17, and multiple second wire outlet grooves 19 on the surface of the upper cover wire frame 18.

[0024] It should be noted that the lower seat mounting bracket 1 constitutes the main load-bearing structure of the seat base, while the seat back mounting bracket 11 is used to install the backrest. The lower mounting plate 12 is fixed to the lower end of the base bracket, and the fixing block 13 and the rotating shaft 14 on it together constitute the rotating mounting base of the lower cover wire frame 15, so that the lower cover wire frame 15 can be flipped and opened around the rotating shaft 14, which facilitates the laying and maintenance of the wire harness. The first wire outlet groove 16 is used to guide the wire harness led out from the seat base area. The upper mounting plate 17 is fixed to the skeleton reinforcement mechanism of the backrest area, and the upper cover wire frame 18 covers the wire harness in the backrest area. The second wire outlet groove 19 on it is used to guide the wire harness led out from the backrest area.

[0025] It is worth noting that the bracket creatively integrates a dedicated wire harness management structure into the lightweight base and seat back mounting bracket 11. The lower cover wire frame 15 is rotatably mounted on the bottom of the lower seat mounting bracket 1 via a pivot 14, making it easy to flip open during maintenance to expose the wire harness. The upper cover wire frame 18 covers the wire harness of the seat back mounting bracket 11. Multiple first wire outlet slots 16 and second wire outlet slots 19 provide flexible wire harness exit points, replacing the traditional binding method.

[0026] Refer to the instruction manual appendix Figures 4 to 5 Elastic pressure pads 20 are installed on the inner sides of the first cable outlet 16 and the second cable outlet 19. Locking mechanisms are provided on the lower cover frame 15 and the upper cover frame 18. The locking mechanisms are used to fix the positions of the lower cover frame 15 and the upper cover frame 18. The locking mechanisms include a snap-fit ​​assembly and a plug-in assembly. The snap-fit ​​end of the snap-fit ​​assembly is connected to the lower mounting plate 12 and is used to fix the position of the lower cover frame 15. The plug-in end of the plug-in assembly is connected to the upper mounting plate 17 and is used to fix the position of the upper cover frame 18.

[0027] It should be noted that the elastic wire clamping pad 20 is usually made of flexible materials such as rubber or silicone and is installed inside the wire outlet groove. Its main function is to provide buffering and clamping force when the wire harness passes through the wire outlet groove, preventing the wire harness from directly rubbing against the hard edge of the groove and causing damage to the insulation layer. It also plays a certain role in sealing and dust prevention. The locking mechanism is the key to ensuring that the lower cover wire frame 15 and the upper cover wire frame 18 remain closed and fixed in position under normal working conditions. The snap-fit ​​component acts between the lower cover wire frame 15 and the lower mounting plate 12, and the plug-in component acts between the upper cover wire frame 18 and the upper mounting plate 17. Together, they realize the quick locking and unlocking of the wire frame.

[0028] Refer to the instruction manual appendix Figure 5 The snap-fit ​​assembly includes two lower snap-fit ​​slots 311 formed on the surface of the lower mounting plate 12 and two snap-fit ​​blocks 312 mounted on the surface of the lower cover frame 15.

[0029] It should be noted that the buckle assembly is specifically implemented by opening two lower buckle grooves 311 on the surface of the lower mounting plate 12 and installing two buckle blocks 312 at the corresponding positions of the lower cover frame 15. When the lower cover frame 15 is closed, the buckle blocks 312 will be embedded in the corresponding lower buckle grooves 311 to form a mechanical interlock, thereby fixing the position of the lower cover frame 15. The buckle blocks 312 are usually designed with guide slopes or elastic structures to facilitate the buckling operation.

[0030] Refer to the instruction manual appendix Figure 4 The plug-in assembly includes a plurality of upper plug-in slots 321 formed on the surface of the upper mounting plate 17 and a plurality of plug-in blocks 322 mounted on the surface of the upper cover frame 18.

[0031] It should be noted that the plug-in assembly is specifically implemented by opening multiple upper plug-in slots 321 on the surface of the upper mounting plate 17 and installing multiple plug-in blocks 322 at corresponding positions on the upper cover frame 18. When installing the upper cover frame 18, the plug-in blocks 322 are aligned and inserted into the corresponding upper plug-in slots 321 to achieve positioning and fixation.

[0032] Refer to the instruction manual appendix Figure 3 The frame reinforcement mechanism is used to support the body of the passenger. The frame reinforcement mechanism includes a body support assembly and a frame support assembly. The body support assembly is used to support the body of the passenger, and the frame support assembly is used to fix the bracket to the installation location of the vehicle.

[0033] It should be noted that the frame reinforcement mechanism is the core component that ensures the lightweight frame has sufficient strength and rigidity. The body support component is directly responsible for bearing and distributing the weight and pressure of the occupant's body, ensuring riding comfort and safety. The frame support component is responsible for firmly connecting the entire seat frame assembly to the predetermined mounting point on the vehicle body, transferring the load to the vehicle body, and resisting various dynamic forces during vehicle operation.

[0034] It is worth noting that this structural design, which supports the occupant's body and connects and fixes it to the vehicle body, aims to achieve lightweighting while meeting the stiffness and strength requirements of the seat frame as a safety component by optimizing material distribution and strengthening critical paths.

[0035] Refer to the instruction manual appendix Figure 3 The body support assembly includes multiple backrest support bars 411 mounted on the surface of the seat backrest mounting bracket 11 and multiple hip and leg support bars 412 mounted on the upper end of the lower body seat mounting bracket 1. The upper mounting plate 17 is fixedly connected to the backrest support bars 411.

[0036] It should be noted that the body support component is specifically composed of multiple backrest support strips 411 installed on the surface of the seat back mounting bracket 11 and multiple hip and leg support strips 412 installed on the upper end of the lower seat mounting bracket 1. These support strips are usually arranged horizontally or vertically, directly supporting the entire seat foam and the occupant's body. The upper mounting plate 17 is fixedly connected to the backrest support strips 411, which means that the wiring harness management structure in the backrest area is directly installed and fixed based on the reinforcing structure that supports the occupant's body.

[0037] Refer to the instruction manual appendix Figure 3 The frame support assembly includes four rectangular support seats 421 mounted on the lower end of the lower seat mounting bracket 1 and connecting rods 422 mounted on the surfaces of two support seats 421.

[0038] It should be noted that the frame support assembly is specifically composed of four support seats 421 and connecting rods 422. The four support seats 421 are installed in a rectangular layout at the lower end of the lower seat mounting bracket 1, usually corresponding to the vehicle body mounting point, forming the main support base. The connecting rods 422 are connected between two support seats 421 to increase the rigidity and stability of the entire bracket bottom, resist torsional deformation, and distribute the load more evenly to the support seats 421.

[0039] Refer to the instruction manual appendix Figures 1 to 2 The angle adjustment mechanism is connected to the seat back mounting bracket 11. The angle adjustment mechanism is used to adjust the angle of the seat back mounting bracket 11. The angle adjustment mechanism includes a first rotating component and a second rotating component. The first rotating component is connected to the seat back mounting bracket 11 and is used to install a rotating power device. The second rotating component is connected to the seat back mounting bracket 11 and is used to rotatably connect the lower seat mounting bracket 1 and the seat back mounting bracket 11.

[0040] It should be noted that the angle adjustment mechanism is a mechanical structure that realizes the function of adjusting the seat back angle. One end of it is connected to the seat back mounting bracket 11, which drives it to rotate relative to the lower seat mounting bracket 1. The main function of the first rotating component is to install and provide rotational power, such as installing an adjustment motor. The main function of the second rotating component is to realize the rotational connection between the lower seat mounting bracket 1 and the seat back mounting bracket 11 and to transmit the support force. The two work together to ensure that the backrest can be adjusted stably and smoothly.

[0041] Refer to the instruction manual appendix Figures 1 to 2 The first rotating assembly includes a power mounting plate 511 mounted on the upper end of the lower seat mounting bracket 1 and a first rotating connecting plate 512 rotatably connected to the surface of the power mounting plate 511. The first rotating connecting plate 512 is connected to the seat back mounting bracket 11.

[0042] It should be noted that the first rotating component is the key part for power transmission or support to realize the backrest angle adjustment. The power mounting plate 511 is fixedly installed on the upper end of the lower seat mounting bracket 1. Its core function is to provide a stable mounting platform for the rotating power equipment. The first rotating connecting plate 512 is rotatably connected to the power mounting plate 511. The other end of the first rotating connecting plate 512 is fixedly connected to the seat back mounting bracket 11. When the power equipment drives the rotating component on the power mounting plate 511, it will drive the first rotating connecting plate 512 to rotate around its connection point with the power mounting plate 511, thereby pushing or pulling the seat back mounting bracket 11 to change the angle.

[0043] Refer to the instruction manual appendix Figures 1 to 2 The second rotating assembly includes a fixed side plate 521 mounted on the upper end of the lower seat mounting bracket 1 and a second rotating connecting plate 522 rotatably connected to the surface of the fixed side plate 521. The second rotating connecting plate 522 is connected to the seat back mounting bracket 11.

[0044] It should be noted that the second rotating component constitutes the physical rotation point of the backrest relative to the base, mainly undertaking the functions of supporting and guiding rotation. It is usually not directly equipped with power equipment. The fixed side plate 521 is fixedly installed on the upper end of the lower seat mounting bracket 1, usually located on the other side of the seat. The second rotating connecting plate 522 is rotatably connected to the fixed side plate 521. The other end of the second rotating connecting plate 522 is fixedly connected to the seat back mounting bracket 11. The fixed side plate 521 provides a stable support base. The rotating pair formed by the second rotating connecting plate 522 and the fixed side plate 521 defines the axis of rotation of the backrest and bears the load transmitted from the backrest.

[0045] Working principle: The lower seat mounting bracket 1 is equipped with a rotatable lower cover wire frame 15 via multiple lower mounting plates 12 at its lower end, as well as fixing blocks 13 and rotating shafts 14. Multiple first cable outlet grooves 16 are formed on the surface of the lower cover wire frame 15 to accommodate and guide the wiring harness in the seat base area. The seat back mounting bracket 11 area is reinforced by a frame strengthening mechanism. The backrest support bar 411 and hip and leg support bar 412 in the body support assembly support the occupant's back and hips and legs respectively. The four support seats 421 and connecting rods 422 of the frame support assembly securely mount the bracket to the vehicle body. An upper cover wire frame 18 is mounted on an upper mounting plate 17 on the frame strengthening mechanism. Multiple second cable outlet grooves 19 are formed on its surface to accommodate and guide the wiring harness in the seat back area. Elastic pressure pads 20 are provided inside the first and second cable outlet grooves 16 and 19 to protect the wiring harness from wear. The lower cover wire frame 15 is secured by snap-fit ​​blocks on its surface. The buckle assembly formed by the lower buckle groove 311 on the lower mounting plate 12 and 312 is locked in position and can be rotated around the pivot 14 for wire harness maintenance. The upper cover wire frame 18 is fixed in position by inserting the plug block 322 on its surface into the plug assembly formed by the upper plug groove 321 on the upper mounting plate 17. The angle adjustment mechanism is used to change the backrest angle. Its first rotating component is composed of a power mounting plate 511 and a first rotating connecting plate 512 rotatably connected to it, which is used to install the drive device and transmit power. The second rotating component is composed of a fixed side plate 521 and a second rotating connecting plate 522 rotatably connected to it, which provides a rotation fulcrum and hinges the seat back mounting bracket 11 to the lower seat mounting bracket 1 to achieve stable angle adjustment of the backrest. The whole device, while ensuring lightweight and structural strength, replaces the traditional binding method with an integrated and easily openable wire harness management structure, which effectively solves the problems of easy damage and inconvenient disassembly and assembly of wire harnesses.

[0046] The above embodiments only illustrate several implementation methods of this utility model, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of this utility model patent. It should be noted that those skilled in the art can make several modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model.

Claims

1. A lightweight automotive seat mounting bracket, characterized in that: The system includes a lower seat mounting bracket (1), an angle adjustment mechanism, a seat back mounting bracket (11), a lower mounting plate (12) at the lower end of the lower seat mounting bracket (1), two fixing blocks (13) at the lower end of the lower mounting plate (12), a rotating shaft (14) between the two fixing blocks (13), a lower cover wire frame (15) on the outside of the rotating shaft (14), a number of first wire outlet grooves (16) on the surface of the lower cover wire frame (15), a skeleton reinforcement mechanism on the lower seat mounting bracket (1) and the seat back mounting bracket (11), two upper mounting plates (17) on the support mechanism, an upper cover wire frame (18) on the surface of the upper mounting plate (17), and a number of second wire outlet grooves (19) on the surface of the upper cover wire frame (18).

2. The lightweight automotive seat mounting bracket according to claim 1, characterized in that: Elastic pressure pads (20) are installed on the inner sides of the first cable outlet groove (16) and the second cable outlet groove (19). Locking mechanisms are provided on the lower cover wire frame (15) and the upper cover wire frame (18). The locking mechanisms are used to fix the positions of the lower cover wire frame (15) and the upper cover wire frame (18). The locking mechanisms include a snap-fit ​​assembly and a plug-in assembly. The snap-fit ​​end of the snap-fit ​​assembly is connected to the lower mounting plate (12). The snap-fit ​​assembly is used to fix the position of the lower cover wire frame (15). The plug-in end of the plug-in assembly is connected to the upper mounting plate (17). The plug-in assembly is used to fix the position of the upper cover wire frame (18).

3. The lightweight automotive seat mounting bracket according to claim 2, characterized in that: The snap-fit ​​assembly includes two lower snap-fit ​​slots (311) formed on the surface of the lower mounting plate (12) and two snap-fit ​​blocks (312) mounted on the surface of the lower cover frame (15).

4. The lightweight automotive seat mounting bracket according to claim 3, characterized in that: The plug-in assembly includes a plurality of upper plug slots (321) formed on the surface of the upper mounting plate (17) and a plurality of plug blocks (322) mounted on the surface of the upper cover frame (18).

5. A lightweight automotive seat mounting bracket according to claim 1, characterized in that: The frame reinforcement mechanism is used to support the occupant's body. The frame reinforcement mechanism includes a body support assembly and a frame support assembly. The body support assembly is used to support the occupant's body, and the frame support assembly is used to fix the bracket to the vehicle's mounting location.

6. A lightweight automotive seat mounting bracket according to claim 5, characterized in that: The body support assembly includes multiple backrest support strips (411) mounted on the surface of the seat backrest mounting bracket (11) and multiple hip and leg support strips (412) mounted on the upper end of the lower body seat mounting bracket (1), with the upper mounting plate (17) fixedly connected to the backrest support strips (411).

7. A lightweight automotive seat mounting bracket according to claim 6, characterized in that: The frame support assembly includes four rectangular support seats (421) mounted on the lower end of the lower seat mounting bracket (1) and connecting rods (422) mounted on the surfaces of two support seats (421).

8. A lightweight automotive seat mounting bracket according to claim 1, characterized in that: The connecting end of the angle adjustment mechanism is connected to the seat back mounting bracket (11). The angle adjustment mechanism is used to adjust the angle of the seat back mounting bracket (11). The angle adjustment mechanism includes a first rotating component and a second rotating component. The connecting end of the first rotating component is connected to the seat back mounting bracket (11). The first rotating component is used to install a rotating power device. The connecting end of the second rotating component is connected to the seat back mounting bracket (11). The second rotating component is used to rotatably connect the lower seat mounting bracket (1) and the seat back mounting bracket (11).

9. A lightweight automotive seat mounting bracket according to claim 8, characterized in that: The first rotating assembly includes a power mounting plate (511) mounted on the upper end of the lower seat mounting bracket (1) and a first rotating connecting plate (512) rotatably connected to the surface of the power mounting plate (511), the first rotating connecting plate (512) being connected to the seat back mounting bracket (11).

10. A lightweight automotive seat mounting bracket according to claim 9, characterized in that: The second rotating assembly includes a fixed side plate (521) mounted on the upper end of the lower seat mounting bracket (1) and a second rotating connecting plate (522) rotatably connected to the surface of the fixed side plate (521). The second rotating connecting plate (522) is connected to the seat back mounting bracket (11).

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