Seat backrest adjusting linkage mechanism

Abstract

The invention discloses a seat backrest adjusting linkage mechanism which comprises an air pressure rod, a supporting frame is arranged on the periphery of the air pressure rod, moving wheels are arranged on the lower portion of the supporting frame, a frog supporting base plate is arranged on the upper portion of the air pressure rod, and a leisure knob is arranged on the side face of the frog supporting base plate. Rotating shafts are arranged on the two sides of the frog support base plate, mounting frames are mounted outside the rotating shafts, and fixing frames are arranged on the upper portions of the mounting frames. When adjustment is needed, an adjusting rod is rotated to open a lock catch, a driving plate and a fixed plate rotate, a backup plate inclines, and a driving block drives a driving shaft to move in the inclining process, so that a movable seat plate slides on the surface of a mounting frame together; therefore, the waist support part and the headrest are always consistent with the relative positions of the human body; therefore, a comfortable support is provided for the waist when a user sits or tilts.

Description

Technical Field

[0001] The present invention relates to the technical field of educational data processing, and more specifically to a seat back adjustment linkage mechanism. Background Art

[0002] Gaming chairs are made of high-quality materials to ensure the stability and load-bearing capacity of the chair. The base is usually made of sturdy steel or aluminum alloy, while the seat and back are filled with high-density memory foam and wrapped with wear-resistant, breathable fabric or leather. This design not only provides strong support for players, but also ensures a comfortable experience during long gaming sessions. Ergonomic design is one of the core features of gaming chairs. The backrest and armrests of the chair can be freely adjusted according to the player's body shape and habits to ensure the best sitting posture and arm support. At the same time, the tilt angle of the chair can also be adjusted, allowing players to stay relaxed during intense gaming sessions. This design not only helps reduce physical fatigue, but also improves players' gaming performance.

[0003] Due to the difference between the rotation center of the human body and the rotation center of the backrest, when the backrest is tilted, the backrest lumbar support position and the human waist will be relatively displaced. This displacement will become more obvious as the backrest tilts more. Especially when the backrest of the gaming chair is reclined at an angle of 45-55 degrees, the lumbar support and headrest will shift upward relative to the human body. When the backrest is reclined, the back will be pushed up and the waist will be empty. The headrest will also be above the head, and the comfort experience will be worse. Therefore, a new technical solution is needed to solve this problem. Summary of the invention

[0004] The purpose of the present invention is to provide a seat back adjustment linkage mechanism, which solves the problem that the backrest lumbar support position and the human body's waist are relatively displaced when the backrest is tilted due to the difference in the position of the rotation center of the human body and the rotation center of the backrest, and the displacement becomes more obvious as the backrest tilts larger. In particular, when the backrest of the e-sports chair is folded down to an angle of 45-55 degrees, the lumbar support and the headrest will shift upward relative to the human body, and when the backrest is folded down, the back will be pushed up and the waist will be empty, and the headrest will be on the upper part of the head, thereby worsening the comfort experience.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a seat back adjustment linkage mechanism, comprising: a gas pressure rod, a support frame is arranged around the gas pressure rod and a moving wheel is arranged at the lower part of the support frame, a frog support chassis is arranged on the upper part of the gas pressure rod and a free-wheeling knob is arranged on the side of the frog support chassis, a rotating shaft is arranged on both sides of the frog support chassis and a mounting frame is installed on the outside of the rotating shaft, a fixed frame is arranged on the upper part of the mounting frame and the fixed frame and the mounting frame are fixedly connected, a plurality of groups of sliding grooves are arranged inside the fixing frame and a sliding block is arranged inside the sliding groove, a connecting rod is arranged on the upper part of the sliding block and the connecting rod and the sliding block are fixedly connected, a movable seat plate is arranged on the upper part of the fixing frame and a connecting nut is arranged inside the movable seat plate, the connecting nut is threadedly connected to the connecting rod and the movable seat plate is slidably connected to the fixed frame through the sliding block, a mounting seat is arranged on the surface of the movable seat plate and a mounting seat is arranged The cam is provided with a first plate, a second plate, and a second plate is provided on the side of the first plate, and a driving shaft is provided on the second plate, and a fixing plate is fixedly installed on both sides of the mounting frame, and an angle adjuster is provided on the inner side of the fixing plate, and a driving plate is provided on the side of the angle adjuster, and the driving plate is rotatably connected to the fixing plate through the angle adjuster. A driving block is provided at the lower part of the driving plate, and a waist groove is provided inside the driving block, and the driving shaft is located inside the waist groove, and a backrest is fixedly installed on the side of the driving plate, and the backrest is rotatably connected to the fixing plate through the driving plate and the angle adjuster, and an adjusting handle is provided on the side of the angle adjuster, and a limiting groove is provided inside the fixing plate on the other side, and a limiting column is provided on the side of the driving plate on the other side, and a volute spring is provided inside the angle adjuster, one end of the volute spring is fixed to the rotating shaft of the angle adjuster, and the other end is connected to the limiting column, and the limiting column is located inside the limiting groove.

[0006] As a preferred embodiment of the present invention, the backrest surface is provided with a waist support area and a head support area, and the waist support area and the head support area fit the waist and head of the human body.

[0007] As a preferred embodiment of the present invention, a sponge cushion is provided on the surface of the movable seat plate, a nail slot is provided on the bottom of the movable seat plate, the movable seat plate and the sponge cushion are connected by leather wrapping, and the leather is fixed between the nails and the nail slot.

[0008] As a preferred embodiment of the present invention, a second fitting edge is provided at the bottom of the lumbar support and a first fitting edge is provided at the side of the sponge cushion, and the first fitting edge and the second fitting edge fit each other when the backrest is tilted.

[0009] As a preferred embodiment of the present invention, a gasket is provided on the surface of the connecting rod and the gasket is provided in a circular structure.

[0010] As a preferred embodiment of the present invention, a connecting block is disposed inside the fixing frame and a return spring is disposed inside the connecting block, and the other end of the return spring column is connected to the bottom of the movable seat plate.

[0011] Compared with the prior art, the present invention has the following beneficial effects:

[0012] The pneumatic rod of the present invention is provided with a support frame around it, and a moving wheel is provided at the lower part of the support frame, a frog support chassis is provided on the upper part of the pneumatic rod, and a free-range knob is provided on the side of the frog support chassis, a rotating shaft is provided on both sides of the frog support chassis, and a mounting frame is installed outside the rotating shaft, a fixing frame is provided on the upper part of the mounting frame, and the fixing frame and the mounting frame are fixedly connected, a plurality of groups of sliding grooves are provided inside the fixing frame, and a sliding block is provided inside the sliding groove, a connecting rod is provided on the upper part of the sliding block, and the connecting rod and the sliding block are fixedly connected, and a connecting rod is provided on the upper part of the fixing frame. A movable seat plate is provided, and a connecting nut is provided inside the movable seat plate, the connecting nut is threadedly connected to the connecting rod, and the movable seat plate is slidably connected to the fixed frame through a sliding block, a mounting seat is provided on the surface of the movable seat plate, and a first connecting plate is provided inside the mounting seat, a second connecting plate is provided on the side of the first connecting plate, and a driving shaft is provided inside the second connecting plate, fixedly installed fixing plates are provided on both sides of the mounting frame, and an angle adjuster is provided on the inner side of the fixing plate, a driving plate is provided on the side of the angle adjuster, and the driving plate is rotatably connected to the fixing plate through the angle adjuster. A driving block is provided at the lower part of the driving plate, and a waist groove is provided inside the driving block, the driving shaft is located inside the waist groove, a backrest is fixedly installed on the side of the driving plate, and the backrest is rotatably connected to the fixed plate through the driving plate and the angle adjuster, an adjusting handle is provided on the side of the angle adjuster, a limiting groove is provided inside the fixed plate on the other side, a limiting column is provided on the side of the driving plate on the other side, and a volute spring is provided inside the angle adjuster, one end of the volute spring is fixed to the rotating shaft of the angle adjuster and the other end is connected to the limiting column, the limiting column is located inside the limiting groove, and when adjustment is required When adjusting the seat, turn the adjusting rod to open the lock, so that the driving plate and the fixed plate rotate, and the back plate tilts. During the tilting process, the driving block drives the driving shaft to move, so that the movable seat plate slides together on the surface of the mounting frame. Since the rotation center of the recliner is basically consistent with the rotation center of the human body when tilting, the lumbar support and the headrest are always consistent with the relative position of the human body; in this way, the waist has a more comfortable support whether sitting or leaning. This structure is separated from the frog support chassis, and different chassis can be installed according to customer needs, and the applicability is greatly improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0014] Figure 2 It is a side view structural schematic diagram of the present invention;

[0015] Figure 3 It is a schematic diagram of the bottom structure of the present invention;

[0016] Figure 4 It is a schematic diagram of the structure of the fixing frame of the present invention;

[0017] Figure 5 It is a schematic diagram of the structure of the movable seat plate of the present invention.

[0018] In the figure: 1. gas pressure rod; 2. support frame; 3. moving wheel; 4. movable seat plate; 5. sponge cushion; 6. adjustment rod; 7. angle adjuster; 8. backrest; 9. lumbar support area; 10. head support area; 11. frog support chassis; 12. free and easy knob; 13. rotating shaft; 14. mounting frame; 15. drive block; 16. drive shaft; 17. first fitting edge; 18. second fitting edge; 19. fixing frame; 20. sliding groove; 21. sliding block; 22. connecting block; 23. reset spring; 24. connecting rod; 25. gasket; 26. connecting nut; 27. mounting seat; 28. first connecting plate; 29. ​​second connecting plate; 30. driving plate DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0020] See also Figure 1-5The present invention provides a technical solution: a seat back adjustment linkage mechanism, comprising: a gas pressure rod 1, a support frame 2 is arranged around the gas pressure rod 1, and a moving wheel 3 is arranged at the lower part of the support frame 2, a frog support chassis 11 is arranged at the upper part of the gas pressure rod 1, and a free-range knob 12 is arranged on the side of the frog support chassis 11, a rotating shaft 13 is arranged on both sides of the frog support chassis 11, and a mounting frame 14 is installed outside the rotating shaft 13, a fixing frame 19 is arranged on the upper part of the mounting frame 14, and the fixing frame 19 is fixedly connected to the mounting frame 14, a plurality of groups of sliding grooves 20 are arranged inside the fixing frame 19, and a sliding block 21 is arranged inside the sliding groove 20, a connecting rod 24 is arranged on the upper part of the sliding block 21, and the connecting rod 24 and the sliding block 21 are connected to each other. The movable seat plate 4 is fixedly connected with the movable block 21, the upper part of the fixed frame 19 is provided with a movable seat plate 4 and the interior of the movable seat plate 4 is provided with a connecting nut 26, the connecting nut 26 is threadedly connected to the connecting rod 24 and the movable seat plate 4 is slidably connected to the fixed frame 19 through the sliding block 21, the surface of the movable seat plate 4 is provided with a mounting seat 27 and the interior of the mounting seat 27 is provided with a first connecting plate 28, the side of the first connecting plate 28 is provided with a second connecting plate 29 and the interior of the second connecting plate 29 is provided with a driving shaft 16, both sides of the mounting frame 14 are provided with fixedly installed fixing plates 31 and the inner side of the fixing plate 31 is provided with an adjuster 7, the side of the adjuster 7 is provided with a driving plate 30 and the driving plate 30 is connected to the fixing plate through the adjuster 7 31 are rotatably connected, a driving block 15 is provided at the lower part of the driving plate 30, and a waist groove is provided inside the driving block 15, and the driving shaft 16 is located inside the waist groove, a backrest 8 is fixedly installed on the side of the driving plate 30, and the backrest is rotatably connected to the fixed plate 31 through the driving plate 30 and the angle adjuster 7, an adjusting rod 6 is provided on the side of the angle adjuster 7, a support frame 2 is provided around the pneumatic rod 1, and a moving wheel 3 is provided at the lower part of the support frame 2, a frog support chassis 11 is provided on the upper part of the pneumatic rod 1, and a free-range knob 12 is provided on the side of the frog support chassis 11, a rotating shaft 13 is provided on both sides of the frog support chassis 11, and a mounting frame 14 is installed on the outside of the rotating shaft 13, a fixing frame 19 is provided on the upper part of the mounting frame 14, and the fixing frame 19 is fixedly connected with the mounting frame 14, a plurality of groups of sliding grooves 20 are arranged inside the fixing frame 19, and a sliding block 21 is arranged inside the sliding groove 20, a connecting rod 24 is arranged on the upper part of the sliding block 21, and the connecting rod 24 and the sliding block 21 are fixedly connected, a movable seat plate 4 is arranged on the upper part of the fixing frame 19, and a connecting nut 26 is arranged inside the movable seat plate 4, the connecting nut 26 is threadedly connected to the connecting rod 24, and the movable seat plate 4 is slidably connected to the fixing frame 19 through the sliding block 21, a mounting seat 27 is arranged on the surface of the movable seat plate 4, and a first connecting plate 28 is arranged inside the mounting seat 27, a second connecting plate 29 is arranged on the side of the first connecting plate 28, and a driving shaft 16 is arranged inside the second connecting plate 29,A fixed plate 31 is fixedly installed on both sides of the mounting frame 14, and a recliner 7 is arranged on the inner side of the fixed plate 31. A driving plate 30 is arranged on the side of the recliner 7, and the driving plate 30 is rotatably connected with the fixed plate 31 through the recliner 7. A driving block 15 is arranged at the lower part of the driving plate 30, and a waist groove is arranged inside the driving block 15. The driving shaft 16 is located inside the waist groove. A backrest 8 is fixedly installed on the side of the driving plate 30, and the backrest is rotatably connected with the fixed plate 31 through the driving plate 30 and the recliner 7. An adjusting handle 6 is arranged on the side of the recliner 7. A limiting groove 34 is arranged inside the fixed plate 31 on the other side, a limiting column 32 is arranged on the side of the driving plate 30 on the other side, and a spiral spring 33 is arranged inside the recliner 7. The spiral spring 3 One end of 3 is fixed to the rotating shaft of the recliner 7 and the other end is connected to the limiting column 32. The limiting column 32 is located inside the limiting groove 34. When adjustment is needed, the adjusting rod 6 is rotated to open the lock, so that the driving plate 30 and the fixed plate 31 rotate, and the back plate is tilted. During the tilting process, the driving block 15 drives the driving shaft 16 to move, so that the movable seat plate 4 slides together on the surface of the mounting frame 14. Since the rotation center of the recliner is basically consistent with the rotation center of the human body when tilting, the lumbar support part and the headrest are always consistent with the relative position of the human body; in this way, the waist has a more comfortable support whether sitting or tilting. This structure is separated from the frog support chassis 11, and different chassis can be installed according to customer needs, and the applicability is greatly improved.

[0021] Further improvements, such as Figure 1 As shown: the surface of the backrest 8 is provided with a lumbar support area 9 and a head support area 10, which fit the waist and head of the human body. The lumbar support area 9 and the head support area 10 can fit the waist and head of the human body tightly, provide more precise support, help reduce fatigue during long-term gaming or work, and enhance the overall user experience.

[0022] Further improvements, such as Figure 1 As shown: a sponge cushion 5 is arranged on the surface of the movable seat plate 4, a nail slot is arranged on the bottom of the movable seat plate 4, the movable seat plate 4 and the sponge cushion 5 are connected by leather wrapping, and the leather is fixed by nails and the nail slots. The addition of the sponge cushion 5 increases the softness and comfort of the seat, providing the user with a more comfortable sitting feeling.

[0023] Further improvements, such as Figure 2 As shown: a second fitting edge 18 is provided at the bottom of the lumbar support and a first fitting edge 17 is provided on the side of the sponge cushion 5. When the backrest 8 is tilted, the first fitting edge 17 and the second fitting edge 18 are fitted together. When the backrest 8 is tilted, a gap can be effectively prevented from being generated between the lumbar support and the cushion, thereby providing a certain amount of avoidance for the tilting of the backrest.

[0024] Further improvements, such as Figure 4 As shown: the surface of the connecting rod 24 is provided with a gasket 25 and the gasket 25 is provided in a circular structure. The provision of the gasket 25 helps to reduce the friction and wear between the connecting rod 24 and adjacent components, thereby extending the service life of the seat.

[0025] Further improvements, such as Figure 4 As shown: the fixing frame 19 is provided with a connecting block 22 inside and a return spring 23 is provided inside the connecting block 22, the other end of the return spring 23 column is connected to the bottom of the movable seat plate 4, and the return spring 23 can help the movable seat plate 4 and the backrest 8 to automatically return to the initial position.

[0026] Working principle: A support frame 2 is arranged around the gas pressure rod 1, and a moving wheel 3 is arranged at the lower part of the support frame 2, a frog support chassis 11 is arranged on the upper part of the gas pressure rod 1, and a free-range knob 12 is arranged on the side of the frog support chassis 11, a rotating shaft 13 is arranged on both sides of the frog support chassis 11, and a mounting frame 14 is installed outside the rotating shaft 13, a fixing frame 19 is arranged on the upper part of the mounting frame 14, and the fixing frame 19 and the mounting frame 14 are fixedly connected, a plurality of groups of sliding grooves 20 are arranged inside the fixing frame 19, and a sliding block 21 is arranged inside the sliding groove 20, a connecting rod 24 is arranged on the upper part of the sliding block 21, and the connecting rod 24 and the sliding block 21 are fixedly connected. A movable seat plate 4 is provided on the upper part of the fixed frame 19, and a connecting nut 26 is provided inside the movable seat plate 4. The connecting nut 26 is threadedly connected to the connecting rod 24, and the movable seat plate 4 is slidably connected to the fixed frame 19 through the sliding block 21. A mounting seat 27 is provided on the surface of the movable seat plate 4, and a first connecting plate 28 is provided inside the mounting seat 27. A second connecting plate 29 is provided on the side of the first connecting plate 28, and a driving shaft 16 is provided inside the second connecting plate 29. Fixedly installed fixing plates 31 are provided on both sides of the mounting frame 14, and an adjuster 7 is provided on the inner side of the fixing plate 31. A driving plate 30 is provided on the side of the adjuster 7, and the driving plate The backrest 8 is fixedly mounted on the side of the driving plate 30 and the backrest 8 is rotatably connected to the fixed plate 31 through the recliner 7. A driving block 15 is provided at the lower part of the driving plate 30 and a waist groove is provided inside the driving block 15. The driving shaft 16 is located inside the waist groove. A backrest 8 is fixedly mounted on the side of the driving plate 30 and the backrest 8 is rotatably connected to the fixed plate 31 through the driving plate 30 and the recliner 7. An adjusting handle 6 is provided on the side of the recliner 7. A limiting groove 34 is provided inside the fixed plate 31 on the other side. A limiting column 32 is provided on the side of the driving plate 30 on the other side and a spiral spring 33 is provided inside the recliner 7. One end of the spiral spring 33 is fixed to the rotating shaft of the recliner 7 and the other end is connected to the limiting column 32. The limiting column 32 is located inside the limiting groove 34. When adjustment is needed, the adjusting rod 6 is rotated to open the lock, so that the driving plate 30 and the fixed plate 31 rotate, and the back plate is tilted. During the tilting process, the driving block 15 drives the driving shaft 16 to move, so that the movable seat plate 4 slides together on the surface of the mounting frame 14. Since the rotation center of the angle adjuster is basically consistent with the rotation center of the human body when tilting, the lumbar support part and the headrest are always consistent with the relative position of the human body; in this way, the waist has a more comfortable support whether sitting or leaning. This structure is separated from the frog support chassis 11, and different chassis can be installed according to customer needs, and the applicability is greatly improved.

[0027] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It is obvious to those skilled in the art that the present invention is not limited to the details of the above exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or basic features of the present invention. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present invention is defined by the attached claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims are included in the present invention. Any figure mark in the claims should not be regarded as limiting the claims involved.

[0028] Finally, a few points should be explained: First, in the description of this application, it should be noted that, unless otherwise specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, and can be mechanical or electrical connections, or internal connectivity between two components, or direct connections. "Up", "down", "left", "right", etc. are only used to indicate relative position relationships. When the absolute position of the object being described changes, the relative position relationship may change.

[0029] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A seat back adjustment linkage mechanism, characterized in that: include: A pneumatic rod (1), wherein a support frame (2) is arranged around the pneumatic rod (1) and a moving wheel (3) is arranged at the bottom of the support frame (2), a frog support chassis (11) is arranged at the top of the pneumatic rod (1) and a free-range knob (12) is arranged on the side of the frog support chassis (11), a rotating shaft (13) is arranged on both sides of the frog support chassis (11) and a mounting frame (14) is installed outside the rotating shaft (13), a fixing frame (19) is arranged at the top of the mounting frame (14) and the fixing frame (19) is fixedly connected to the mounting frame (14), and a plurality of groups of sliding grooves (20) are arranged inside the fixing frame (19) and A sliding block (21) is arranged inside the sliding groove (20), a connecting rod (24) is arranged on the upper part of the sliding block (21), and the connecting rod (24) and the sliding block (21) are fixedly connected, a movable seat plate (4) is arranged on the upper part of the fixing frame (19), and a connecting nut (26) is arranged inside the movable seat plate (4), the connecting nut (26) and the connecting rod (24) are threadedly connected, and the movable seat plate (4) is slidably connected to the fixing frame (19) through the sliding block (21), a mounting seat (27) is arranged on the surface of the movable seat plate (4), and a first connecting plate (28) is arranged inside the mounting seat (27), A second connecting plate (29) is arranged on the side of the first connecting plate (28), and a driving shaft (16) is arranged inside the second connecting plate (29); fixedly installed fixing plates (31) are arranged on both sides of the fixing frame (19), and an angle adjuster (7) is arranged on the side of the fixing plate (31); a driving plate (30) is arranged on the side of the angle adjuster (7), and the driving plate (30) is rotatably connected to the fixing plate (31) through the angle adjuster (7); a driving block (15) is arranged at the lower part of the driving plate (30), and a waist groove is arranged inside the driving block (15); the driving shaft (16) is located inside the waist groove; the driving plate (30) is arranged on the lower part of the driving plate (30), and a waist groove is arranged inside the driving block (15); the driving shaft (16) is located inside the waist groove; the driving plate (30) is arranged on the lower part of the driving plate (30), and the driving shaft (16) is arranged on the inner part of the waist groove; the driving shaft (16) is arranged on the inner part of the driving shaft (16); ... A backrest (8) is fixedly installed on the side of the backrest (8) and the backrest (8) is rotatably connected to the fixed plate (31) through a driving plate (30) and an angle adjuster (7); an adjusting handle (6) is arranged on the side of the angle adjuster (7); a limiting groove (34) is arranged inside the fixed plate (31) on the other side; a limiting column (32) is arranged on the side of the driving plate (30) on the other side and a spiral spring (33) is arranged inside the angle adjuster (7); one end of the spiral spring (33) is fixed to the rotating shaft of the angle adjuster (7) and the other end is connected to the limiting column (32); the limiting column (32) is located inside the limiting groove (34).

2. The seat back adjustment linkage mechanism according to claim 1, characterized in that: The surface of the backrest (8) is provided with a waist support area (9) and a head support area (10), and the waist support area (9) and the head support area (10) fit the waist and head of the human body.

3. The seat back adjustment linkage mechanism according to claim 1, characterized in that: The surface of the movable seat plate (4) is provided with a sponge cushion (5), and the bottom of the movable seat plate (4) is provided with a nail clamping slot. The movable seat plate (4) and the sponge cushion (5) are connected by wrapping with leather, and the leather is fixed between the nail and the nail clamping slot.

4. The seat back adjustment linkage mechanism according to claim 1, characterized in that: The bottom of the waist support area (9) is provided with a second bonding edge (18) and the side of the sponge cushion (5) is provided with a first bonding edge (17), and when the backrest (8) is tilted, the first bonding edge (17) and the second bonding edge (18) are bonded to each other.

5. The seat back adjustment linkage mechanism according to claim 1, characterized in that: A gasket (25) is provided on the surface of the connecting rod (24), and the gasket (25) is arranged in a circular structure.

6. The seat back adjustment linkage mechanism according to claim 1, characterized in that: The fixing frame (19) is provided with a connecting block (22) inside and a return spring (23) is provided inside the connecting block (22), and the other end of the return spring (23) column is connected to the bottom of the movable seat plate (4).

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