Backrest locking structure of a backrest chair

Abstract

The utility model discloses a backrest locking structure of backrest -pursuing chair, including seat support seat (1), the seat support seat (1) extends the support portion (2) upwards, the support portion (2) outside sets up the cushion support (3), the cushion support (3) is close to the one end of support portion (2) and extends upwards and forms the backrest support (4), the backrest support (4) relatively the cushion support (3) rotates and pursues back, the backrest support (4) can relatively the cushion support (3) rotate and pursue back, a backrest locking structure of backrest -pursuing chair provided by the utility model, compact structure, locking reliable, operation smooth and have the seat inclination adjustment and locking of buffer function, improve the comfort and reliability of use of user.

Description

Technical Field

[0001] This utility model relates to the field of seat technology, and in particular to a backrest locking structure for a backrest seat. Background Technology

[0002] As a crucial design element for enhancing seating comfort, the convenient adjustment and secure locking of the backrest angle are key aspects of a seat's design. Current technologies often rely on a single torsion spring for tilt adjustment mechanisms, which can lead to uneven force distribution on both sides, causing adjustment stagnation or abnormal noise. Furthermore, locking mechanisms frequently employ simple ratchet teeth or pins, which pose risks of slippage and accidental unlocking under frequent adjustments or heavy loads. The reset process also lacks cushioning, impacting the user experience. In addition, traditional linkage mechanisms are complex and cumbersome, making precise synchronous control of both sides difficult in confined spaces, resulting in stiff operation and reduced reliability. Therefore, there is an urgent need for a compact, reliable, smooth-operating, and cushioned seat tilt adjustment and locking solution to improve user comfort and reliability. Utility Model Content

[0003] (a) Technical problems to be solved

[0004] The technical problem to be solved by this utility model is to provide a backrest locking structure for a backrest seat that can ensure that the seat backrest fits the human body while allowing the seat tilt angle to be freely adjusted and ensuring convenient operation.

[0005] (II) Technical Solution

[0006] The embodiments in this specification provide the following technical solutions:

[0007] This specification provides a backrest locking structure for a backrest-mounted seat, characterized by comprising a seat support base, an upwardly extending support portion, a seat cushion support disposed outside the support portion, and a backrest support extending upwardly from one end of the seat cushion support near the support portion; the backrest support is rotatable relative to the seat cushion support for backrest-mounted movement; the seat cushion support includes an angle locking mechanism, comprising an angle locking switch and an anti-rotation component linked to the angle locking switch; the backrest support is provided with a backrest anti-rotation member that cooperates with the anti-rotation component, the backrest anti-rotation member being fixedly disposed on the backrest rotating portion; when the angle locking switch is in the open state, the anti-rotation component and the backrest anti-rotation member are in an engaged connection state, and the angle of the backrest relative to the seat cushion support is locked; when the angle locking switch is in the closed state, the anti-rotation component and the backrest anti-rotation member are in a non-engaged state, and the backrest is unlocked.

[0008] In the above technical solution, when the angle locking mechanism does not restrict the backrest rotation part, the backrest support can rotate through the backrest rotation part, increasing the comfort of the backrest seat; when the user sits on the seat, as long as it is within the rotation range of the backrest rotation part, whether leaning back or forward, the backrest will always fit the user's back.

[0009] Furthermore, the support portion is fitted with a seat mounting base, and the seat cushion is supported on the seat mounting base; the backrest rotating portion is provided with a rotating shaft inside, and the rotating shaft passes through the seat mounting base and connects to the support portion.

[0010] In the above technical solution, a seat mounting base is first installed on the support part, and then a seat cushion support is installed through the seat mounting base; the rotation axis is set on both sides of the support part, and the backrest support rotates around the rotation axis when it rotates.

[0011] Furthermore, the backrest rotating part includes an internal gear coaxial with the rotating shaft; the anti-rotation assembly includes a pull rod, an anti-rotation disc, an anti-rotation block, and a sleeve; the sleeve is sleeved on the rotating shaft, and the pull rod and the anti-rotation disc are provided on the outer wall of the sleeve. The anti-rotation disc is located at one end near the internal gear. The anti-rotation disc is coaxial with the rotating shaft. The surface of the anti-rotation disc is inclined and has strip-shaped holes. Multiple strip-shaped holes are provided and are evenly arranged in a ring. A movable hook is provided between the anti-rotation block and the strip-shaped holes. The number of movable hooks and anti-rotation blocks corresponds to the number of strip-shaped holes.

[0012] In the above technical solution, when it is necessary to lock the backrest rotating part, pull the lever and drive the anti-rotation disc to rotate. When the anti-rotation disc rotates, the strip hole rotates. Since the anti-rotation block and the strip hole are connected by a movable hook, the strip hole will drive the anti-rotation block to move horizontally. The anti-rotation block moves horizontally to mesh with the internal gear, thereby restricting the rotation of the internal gear. The backrest rotating part is locked. To unlock, simply pull the lever in the opposite direction.

[0013] Furthermore, the anti-rotation component is provided with a support ring, the two ends of which are not connected. The support ring is located inside the movable hook, near one end of the anti-rotation block.

[0014] In the above technical solution, the support ring is not connected at the top and bottom, so it can be pushed by external force to achieve inward or outward expansion. The support ring is set inside the movable hook, which can support the movable hook and keep the anti-rotation block at a set distance from the anti-rotation disc. When the backrest rotation part is unlocked, the support ring retracts, and when the backrest rotation part is locked, the support ring springs back.

[0015] Furthermore, the backrest rotation part includes a first backrest rotation part and a second backrest rotation part disposed on both sides of the seat cushion support. A first torsion spring is disposed inside the first backrest rotation part; a second torsion spring is disposed inside the second backrest rotation part; and both the first torsion spring and the second torsion spring are sleeved on the rotation shaft.

[0016] Furthermore, a connecting shaft is provided between the angle locking switch and the anti-rotation assembly; the connecting shaft includes a main connecting shaft, a forked connector, a first auxiliary connecting shaft, and a second auxiliary connecting shaft; one end of the main connecting shaft is connected to the angle locking switch, and the other end is connected to the forked connector; the end of the forked connector away from the main connecting shaft extends into the first auxiliary connecting shaft and the second auxiliary connecting shaft, the other end of the first auxiliary connecting shaft is connected to the pull rod in the first backrest rotating part; the other end of the second auxiliary connecting shaft is connected to the pull rod in the second backrest rotating part; a first support member is provided outside the first auxiliary connecting shaft; a second support member is provided outside the second auxiliary connecting shaft; one end of the first torsion spring extends outward to cooperate with the inner wall of the first backrest rotating part, and the other end extends in the opposite direction to cooperate with the first support member; one end of the second torsion spring extends outward to cooperate with the second backrest rotating part, and the other end extends in the opposite direction to cooperate with the second support member.

[0017] In the above technical solution, the main connecting shaft can control the first auxiliary connecting shaft and the second auxiliary connecting shaft; the first support member supports the first auxiliary connecting shaft to keep it stable, and the second support member supports the second auxiliary connecting shaft to keep it stable; the first torsion spring and the second torsion spring can keep the backrest support in the initial position when the backrest rotation part is not locked; the setting of the first torsion spring and the second torsion spring allows the backrest to rotate in sync with the backrest.

[0018] Furthermore, the connecting shaft includes a first connecting bolt disposed within the angle locking switch, a second connecting bolt disposed within the first backrest rotating part and cooperating with the pull rod, and a third connecting bolt disposed within the second backrest rotating part and cooperating with its pull rod.

[0019] Furthermore, the angle locking switch includes a lever, an upper mounting cover, and a lower mounting cover; the lever engages with a first connecting bolt and is disposed within the lower mounting cover, while the upper mounting cover engages with the lower mounting cover to cover it.

[0020] In the above technical solution, by moving the lever, the first connecting bolt drives the pull rod that is connected to the second connecting bolt and the pull rod that is connected to the third connecting bolt, thereby completing the locking angle of the backrest or unlocking the rotation of the backrest.

[0021] Furthermore, the backrest support includes a backrest movable rod; the backrest rotating part is provided with a backrest connecting shaft parallel to the rotation axis; the backrest movable rod is connected to the backrest connecting shaft.

[0022] In the above technical solution, the backrest movable rod rotates around the backrest connecting shaft.

[0023] Furthermore, a damper is provided at the top of the backrest movable rod, with one end of the damper located on the inner wall of the backrest support and the other end connected to the top of the backrest movable rod.

[0024] In the above technical solution, the damper can reduce the impact generated by the backrest moving rod.

[0025] (III) Beneficial Effects

[0026] Compared with the prior art, the beneficial effects that at least one technical solution adopted in the embodiments of this specification can achieve include at least:

[0027] (1) The independent torsion springs built into the rotating parts of the backrest on both sides effectively balance the force on both sides, solve the problem of jamming caused by uneven force on one side, and ensure that the backrest angle adjustment process is smooth and stable.

[0028] (2) The anti-rotation component adopts a unique combination of anti-rotation disc inclined strip hole, movable hook and anti-rotation block, combined with support ring, which can provide reliable engagement and locking when under pressure.

[0029] (3) The bifurcated connecting shaft cleverly realizes the precise synchronous control of the double-sided anti-rotation components by the single angle locking switch, and the structure is compact and efficient; at the same time, the damper set at the top of the backrest moving rod provides a buffer for the backrest reset process, improving the comfort and safety of operation. Attached Figure Description

[0030] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0031] Figure 1 This is a schematic diagram of the overall structure of an embodiment of the present utility model;

[0032] Figure 2 This is a schematic diagram of the seat support and backrest support according to an embodiment of the present utility model;

[0033] Figure 3 This is a schematic diagram of the angle locking mechanism according to an embodiment of the present utility model;

[0034] Figure 4 This is an exploded view of the angle locking mechanism according to an embodiment of the present invention;

[0035] Figure 5 This is a schematic diagram of the anti-rotation component according to an embodiment of the present utility model;

[0036] Figure 6 This is a schematic diagram of the structure of the backrest rotating part according to an embodiment of the present utility model;

[0037] Figure 7 This is an enlarged view of the backrest anti-rotation component according to an embodiment of the present utility model;

[0038] Figure 8 This is a schematic diagram of the structure of the backrest rotating part according to an embodiment of the present utility model;

[0039] Figure 9 This is an enlarged view of the first backrest rotating part and the second backrest rotating part according to an embodiment of the present utility model;

[0040] Figure 10 This is a schematic diagram of the connecting shaft of the angle locking mechanism in an embodiment of the present invention;

[0041] Figure 11 This is a schematic diagram of the angle locking switch according to an embodiment of the present invention;

[0042] Figure 12 This is a schematic diagram of the structure of the first connecting bolt in an embodiment of the present utility model;

[0043] Figure 13 This is a schematic diagram of the structure of the second connecting bolt in an embodiment of the present invention;

[0044] Figure 14 This is a schematic diagram of the backrest support structure according to an embodiment of the present invention.

[0045] Among them: 1-seat support base, 2-support part, 3-seat cushion support, 4-backrest support, 5-backrest rotating part, 7-angle locking mechanism, 8-angle locking switch, 9-anti-rotation assembly, 10-seat mounting base, 11-rotating shaft, 12-internal gear, 13-pull rod, 14-anti-rotation disc, 15-anti-rotation block, 16-sleeve, 17-strip hole, 18-movable hook, 19-support ring, 20-connecting shaft, 21-main connecting shaft, 22-forked connector, 23- 24-First connecting shaft, 25-Second connecting shaft, 26-First connecting bolt, 27-Second connecting bolt, 28-Third connecting bolt, 29-Upper mounting cover, 30-Toggle lever, 42-Backrest movable rod, 43-Backrest connecting shaft, 44-Damper, 51-First backrest rotating part, 52-Second backrest rotating part, 233-First support member, 244-Second support member, 511-First torsion spring, 522-Second torsion spring, 122-Backrest anti-rotation member. Detailed Implementation

[0046] The embodiments of this application will now be described in detail with reference to the accompanying drawings.

[0047] The following specific examples illustrate the implementation of this application. Those skilled in the art can easily understand other advantages and effects of this application from the content disclosed in this specification. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. This application can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this application. It should be noted that, in the absence of conflict, the following embodiments and features in the embodiments can be combined with each other. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0048] It should be noted that various aspects of embodiments within the scope of the appended claims are described below. It will be apparent that the aspects described herein can be embodied in a wide variety of forms, and any particular structure and / or function described herein is merely illustrative. Based on this application, those skilled in the art will understand that one aspect described herein can be implemented independently of any other aspect, and two or more of these aspects can be combined in various ways. For example, any number and aspects set forth herein can be used to implement the device and / or practice the method. Additionally, this device and / or method can be implemented using structures and / or functionalities other than one or more of the aspects set forth herein.

[0049] It should also be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of this application. The illustrations only show the components related to this application and are not drawn according to the number, shape and size of the components in actual implementation. In actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0050] Additionally, specific details are provided in the following description to facilitate a thorough understanding of the examples. However, those skilled in the art will understand that practice can be carried out without these specific details.

[0051] Combination Figures 1-7As shown, this application provides a backrest locking structure for a backrest seat, including a seat support 1, a support portion 2 extending upward from the seat support 1, a seat cushion support 3 disposed outside the support portion 2, and a backrest support 4 extending upward from one end of the seat cushion support 3 near the support portion 2; the backrest support is capable of rotating relative to the seat cushion support for backrest locking; the seat cushion support 3 includes an angle locking mechanism 7, the angle locking mechanism 7 includes an angle locking switch 8, and an anti-rotation component 9 linked with the angle locking switch 8; the backrest support 4 is provided with a backrest rotation portion 5 and a backrest anti-rotation member 122 cooperating with the anti-rotation component 9, and the backrest anti-rotation member 122 is fixedly disposed on the backrest rotation portion 5.

[0052] The support part 2 is fitted with a seat mounting base 10, and the seat cushion support 3 is mounted on the seat mounting base 10. The backrest rotating part 5 has a rotating shaft 11 inside, which passes through the seat mounting base 10 and connects to the support part 2. The backrest rotating part 5 includes an internal gear 12 coaxial with the rotating shaft 11. The anti-rotation assembly 9 includes a pull rod 13, an anti-rotation disc 14, an anti-rotation block 15, and a sleeve 16. The sleeve 16 is fitted onto the rotating shaft 11, and the pull rod 13 and the anti-rotation disc 14 are provided on the outer wall of the sleeve 16. The anti-rotation disc 14 is located at one end near the internal gear 12 and is coaxial with the rotating shaft 11. The surface of the anti-rotation disc 14 is inclined with strip-shaped holes 17. Multiple strip-shaped holes 17 are provided and are evenly arranged in a ring. Movable hooks 18 are provided between the anti-rotation blocks 15 and the strip-shaped holes 17. The number of movable hooks 18 and anti-rotation blocks 15 corresponds to the number of strip-shaped holes 17. The anti-rotation component 9 is equipped with a support ring 19, which is not connected end to end. The support ring 19 is located inside the movable hook 18, near one end of the anti-rotation block 15.

[0053] like Figure 6-8As shown, the backrest rotation part 5 includes a first backrest rotation part 51 and a second backrest rotation part 52 disposed on both sides of the seat cushion support 3. A first torsion spring 511 is disposed inside the first backrest rotation part 51; a second torsion spring 522 is disposed inside the second backrest rotation part 52; both the first torsion spring 511 and the second torsion spring 522 are sleeved on the rotation shaft 11. A connecting shaft 20 is disposed between the angle locking switch 8 and the anti-rotation assembly 9; the connecting shaft 20 includes a main connecting shaft 21, a forked connector 22, a first auxiliary connecting shaft 23, and a second auxiliary connecting shaft 24; one end of the main connecting shaft 21 is connected to the angle locking switch 8, and the other end is connected to the forked connector 22; the end of the forked connector 22 away from the main connecting shaft 21 extends into the first auxiliary connecting shaft 23 and the second auxiliary connecting shaft 24, and the other end of the first auxiliary connecting shaft 23 is connected to the pull rod 13 in the first backrest rotation part 51; the second auxiliary connecting shaft 24 extends into the first auxiliary connecting shaft 23 and the second auxiliary connecting shaft 24. The other end of the connecting shaft 24 is connected to the pull rod 13 in the second backrest rotating part 52; a first support member 233 is provided on the outside of the first auxiliary connecting shaft 23; a second support member 244 is provided on the outside of the second auxiliary connecting shaft 24; one end of the first torsion spring 511 extends outward and cooperates with the inner wall of the first backrest rotating part 51, and the other end extends in the opposite direction and cooperates with the first support member 233; one end of the second torsion spring 522 extends outward and cooperates with the second backrest rotating part 52, and the other end extends in the opposite direction and cooperates with the second support member 244.

[0054] like Figure 9-11 As shown, the connecting shaft 20 includes a first connecting bolt 25 disposed within the angle locking switch 8, a second connecting bolt 26 disposed within the first backrest rotating part 51 and cooperating with the pull rod 13, and a third connecting bolt 27 disposed within the second backrest rotating part 52 and cooperating with its pull rod 13. The angle locking switch 8 includes a lever 30, an upper mounting cover 28, and a lower mounting cover 29; the lever 30 cooperates with the first connecting bolt 25 and is disposed within the lower mounting cover 29, and the upper mounting cover 28 cooperates with the lower mounting cover 29 to cover it.

[0055] like Figure 12 As shown, the backrest support 4 includes a backrest movable rod 42; a backrest connecting shaft 43 parallel to the rotation axis 11 is provided inside the backrest rotating part 5; the backrest movable rod 42 is connected to the backrest connecting shaft 43. A damper 44 is provided at the top of the backrest movable rod 42. The damper 44 is a pneumatic spring. One end of the damper 44 is provided on the inner wall of the backrest support 4, and the other end is connected to the top of the backrest movable rod 42.

[0056] When in use, the user sits on the seat, at which point the angle locking mechanism 7 does not lock the backrest rotation part 5, and the backrest support 4 can rotate, ensuring the backrest always fits against the user's back. When it is necessary to lock the backrest rotation part 5, the lever 30 is moved, putting the angle locking switch 8 in the open state. The lever 30 drives the first connecting bolt 25 to move, and when the first connecting bolt 25 moves, it pulls the main connecting shaft 21, thereby causing the second connecting bolt 26 of the first auxiliary connecting shaft 23 and the third connecting bolt 27 of the second auxiliary connecting shaft 24 to pull the pull rod 13. The pull rod 13 causes the sleeve 16 to... When rotated, the anti-rotation disc 14 fitted on the sleeve 16 rotates, and the strip-shaped hole 17 in the anti-rotation disc 14 rotates, causing the movable hook 18 to push the anti-rotation block 15, so that the anti-rotation block 15 meshes with the internal gear 12. The internal gear 12 cannot rotate when it is in the meshed state. At this time, the backrest rotating part 5 is locked and the backrest support 4 cannot rotate. When it is necessary to unlock, simply move the lever 30 in the opposite direction to make the angle locking switch 8 close. The anti-rotation block 15 is separated from the internal gear 12 and is in a non-meshing state. At this time, the backrest rotating part 5 is unlocked and the backrest support 4 can rotate.

[0057] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A backrest locking structure for a backrest seat, characterized in that, The system includes a seat support (1), which extends upward to form a support portion (2). A seat cushion support (3) is provided on the outside of the support portion (2). The seat cushion support (3) extends upward to form a backrest support (4) at one end near the support portion (2). The backrest support (4) rotates relative to the seat cushion support (3) to follow the backrest. The seat cushion support (3) includes an angle locking mechanism (7), which includes an angle locking switch (8) and an anti-rotation component (9) linked to the angle locking switch (8). The backrest support (4) includes a backrest rotating portion (5) and a backrest anti-rotation component (122) that cooperates with the anti-rotation component (9). The backrest anti-rotation component (122) is fixedly mounted on the backrest rotating portion (5). When the angle locking switch (8) is turned on, the anti-rotation component (9) moves to engage with the backrest anti-rotation member (122), and the angle of the backrest relative to the seat cushion support (3) is locked; when the angle locking switch (8) is turned off, the anti-rotation component (9) moves to disengage from the backrest anti-rotation member (122), and the backrest is unlocked.

2. The backrest locking structure of a backrest seat according to claim 1, wherein The support part (2) is covered by a seat mounting base (10), and the seat cushion support (3) is mounted on the seat mounting base (10); the backrest rotating part (5) is provided with a rotating shaft (11), and the rotating shaft (11) passes through the seat mounting base (10) and is connected to the support part (2).

3. The backrest locking structure of a backrest seat according to claim 2, wherein The backrest anti-rotation component (122) is an internal gear (12) coaxial with the rotating shaft (11); the anti-rotation assembly (9) includes a pull rod (13), an anti-rotation disc (14), an anti-rotation block (15), and a sleeve (16); the sleeve (16) is sleeved on the rotating shaft (11), and the outer wall of the sleeve (16) is provided with the pull rod (13) and the anti-rotation disc (14). The anti-rotation disc (14) is located at one end near the internal gear (12), and the anti-rotation disc (14) is coaxial with the rotating shaft (11). 11) Coaxial, the anti-rotation disc (14) has a strip-shaped hole (17) on its surface at an angle. Multiple strip-shaped holes (17) are provided and are evenly arranged in a ring. A movable hook (18) is provided between the anti-rotation block (15) and the strip-shaped hole (17). The number of movable hooks (18) and anti-rotation blocks (15) corresponds to the number of strip-shaped holes (17). The anti-rotation block (15) matches the internal gear (12) so that the rotation of the internal gear (12) is locked or unlocked.

4. The backrest locking structure of a backrest seat according to claim 3, wherein The anti-rotation component (9) is provided with a support ring (19), the support ring (19) is not connected end to end, and the support ring (19) is located inside the movable hook (18), near one end of the anti-rotation block (15).

5. The backrest locking structure of a reclining seat according to claim 1, wherein The backrest rotation part (5) includes a first backrest rotation part (51) and a second backrest rotation part (52) disposed on both sides of the seat cushion support (3). The first backrest rotation part (51) is provided with a first torsion spring (511); the second backrest rotation part (52) is provided with a second torsion spring (522); the first torsion spring (511) and the second torsion spring (522) are both sleeved on the rotation shaft (11).

6. The backrest locking structure of a backrest seat according to claim 5, wherein A connecting shaft (20) is provided between the angle locking switch (8) and the anti-rotation assembly (9); the connecting shaft (20) includes a main connecting shaft (21), a forked connector (22), a first auxiliary connecting shaft (23), and a second auxiliary connecting shaft (24); one end of the main connecting shaft (21) is connected to the angle locking switch (8), and the other end is connected to the forked connector (22); the first auxiliary connecting shaft (23) and the second auxiliary connecting shaft (24) extend from the end of the forked connector (22) away from the main connecting shaft (21), and the other end of the first auxiliary connecting shaft (23) is connected to the pull rod (13) in the first backrest rotating part (51). The other end of the second auxiliary connecting shaft (24) is connected to the pull rod (13) in the second backrest rotating part (52); a first support member (233) is provided on the outside of the first auxiliary connecting shaft (23); a second support member (244) is provided on the outside of the second auxiliary connecting shaft (24); one end of the first torsion spring (511) extends outward to cooperate with the inner wall of the first backrest rotating part (51), and the other end extends in the opposite direction to cooperate with the first support member (233); one end of the second torsion spring (522) extends outward to cooperate with the second backrest rotating part (52), and the other end extends in the opposite direction to cooperate with the second support member (244).

7. The backrest locking structure of a backrest seat according to claim 6, wherein The connecting shaft (20) includes a first connecting bolt (25) disposed in the angle locking switch (8), a second connecting bolt (26) disposed in the first backrest rotating part (51) and cooperating with the pull rod (13), and a third connecting bolt (27) disposed in the second backrest rotating part (52) and cooperating with its pull rod (13).

8. The backrest locking structure of a backrest seat according to claim 7, wherein The angle locking switch (8) includes a lever (30), an upper mounting cover (28), and a lower mounting cover (29); the lever (30) cooperates with the first connecting bolt (25) and is located inside the lower mounting cover (29), and the upper mounting cover (28) cooperates with the lower mounting cover (29) to cover it.

9. The backrest locking structure of a reclining seat according to claim 1, wherein The backrest support (4) includes a backrest movable rod (42); the backrest rotating part (5) is provided with a backrest connecting shaft (43) parallel to the rotating shaft (11); the backrest movable rod (42) is connected to the backrest connecting shaft (43).

10. The backrest locking structure of a backrest seat according to claim 9, wherein A damper (44) is provided at the top of the backrest movable rod (42). One end of the damper (44) is located on the inner wall of the backrest support (4), and the other end is connected to the top of the backrest movable rod (42).

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