Seat back adjustment device and seat

Abstract

The present application relates to the technical field of vehicle seat, disclose a kind of seat backrest adjusting device and seat, seat backrest adjusting device includes guide rail plate, lock catch assembly and elastic compensation frame;Lock catch assembly includes snap ring base, the snap ring base has sliding hole, the guide rail plate is worn in the sliding hole, the snap ring base is configured to be able to slide along the guide rail plate;At least part of elastic compensation frame is arranged in the hole wall of sliding hole and the guide rail;The seat backrest adjusting device provided by the present application is by setting elastic compensation frame between the hole wall of sliding hole and guide rail piece, structure is more simple, assembly is more convenient, later maintenance or replacement is more convenient, reduces the difficulty and cost of maintenance, can also reduce the requirement to part machining precision.

Description

Technical Field

[0001] This invention relates to the field of vehicle seat technology, and in particular to a seat back adjustment device and a seat. Background Technology

[0002] Currently, vehicle seat backrest angle adjustment devices widely adopt a structure in which a locking assembly and a base assembly work together to achieve multiple fixed adjustment positions within a certain angle range. To ensure good functionality and stability during use, especially to avoid abnormal noise caused by collisions between components, high precision is required for the manufacturing of each part, thus increasing production costs and processing difficulty. Taking a vehicle seat backrest adjustment device disclosed in patent number CN214689135U as an example, this device reduces impact noise by setting components such as ball bearings and retainers. Although it improves the abnormal noise problem to a certain extent, its structure is still relatively complex, with a large number of parts and high manufacturing precision, which not only increases the difficulty of assembly but also makes later maintenance and replacement difficult and the maintenance cost high. Summary of the Invention

[0003] With the aim of at least solving one of the technical problems existing in the prior art, the present invention aims to provide a seat back adjustment device and a seat having the seat back adjustment device. The seat back adjustment device has a simpler structure, is easier to assemble, and is more convenient to maintain or replace in the later stage, reducing the difficulty and cost of maintenance, and can also reduce the requirements for the machining accuracy of parts.

[0004] To achieve the above objectives, in a first aspect, the present invention provides a seat back adjustment device, including a guide rail plate, a locking assembly, and an elastic compensation frame; the locking assembly includes a buckle base having a sliding hole, the guide rail plate passing through the sliding hole, and the buckle base being configured to slide along the guide rail plate; at least a portion of the elastic compensation frame is disposed between the hole wall of the sliding hole and the guide rail plate, and both the hole wall of the sliding hole and the guide rail plate are in contact with the elastic compensation frame.

[0005] In some embodiments, the seat back adjustment device has a first direction; the elastic compensation frame includes a first limiting part, a second limiting part, and a compensation part; the buckle base is connected to the first limiting part and the second limiting part at both ends in the first direction, the compensation part passes through the sliding hole, the first limiting part and the second limiting part are both connected to the compensation part, and the hole wall of the sliding hole and the guide rail plate are both in contact with the compensation part.

[0006] In some embodiments, the buckle base has a first end face and a second end face disposed opposite to each other, the first limiting part has a first limiting surface that fits and contacts the first end face, and the second limiting part has a second limiting surface that fits and contacts the second end face.

[0007] In some embodiments, the guide rail plate has an arc-shaped guide trajectory.

[0008] In some embodiments, the seat back adjustment device further has a second direction and a third direction perpendicular to the first direction; the compensation part includes a first arc-shaped plate, a second arc-shaped plate, a third arc-shaped plate, a first support plate, and a second support plate, the first arc-shaped plate, the second arc-shaped plate, and the third arc-shaped plate all passing through the sliding hole, the first arc-shaped plate, the second arc-shaped plate, and the third arc-shaped plate all connected to the first limiting part, the first arc-shaped plate, the second arc-shaped plate, and the third arc-shaped plate all connected to the second limiting part, the first support plate connected to the second arc-shaped plate, and the second support plate connected to the third arc-shaped plate; along the... In the third direction, the first arc-shaped plate is located on one side of the guide rail plate and contacts the guide rail plate and the wall of the sliding hole respectively. The first support plate and the second support plate are both located on the side of the guide rail plate away from the first arc-shaped plate. The first support plate contacts the guide rail plate and the wall of the sliding hole respectively, and the second support plate contacts the guide rail plate and the wall of the sliding hole respectively. In the second direction, the second arc-shaped plate is located on one side of the guide rail plate and contacts the guide rail plate and the wall of the sliding hole respectively. The third arc-shaped plate is located on the side of the guide rail plate away from the second arc-shaped plate and contacts the guide rail plate and the wall of the sliding hole respectively.

[0009] In some embodiments, the apex of the first arc-shaped plate contacts the wall of the sliding hole, and the base point of the first arc-shaped plate contacts the guide rail plate; the apex of the second arc-shaped plate contacts the wall of the sliding hole, and the base point of the second arc-shaped plate contacts the guide rail plate; the apex of the third arc-shaped plate contacts the guide rail plate, and the base point of the third arc-shaped plate contacts the wall of the sliding hole.

[0010] In some embodiments, there are multiple first arc-shaped plates, and the multiple first arc-shaped plates are spaced apart along the second direction.

[0011] In some embodiments, the elastic compensation frame further includes two first limiting plates and two second limiting plates; there are two first supporting plates, one of which is connected to one first limiting plate; there are two second supporting plates, one of which is connected to one second limiting plate; along the first direction, the buckle base is located between the two first limiting plates and between the two second limiting plates.

[0012] In some embodiments, the guide plate includes an arc-shaped guide plate and a flanged reinforcing plate, the flanged reinforcing plate being connected to one end of the arc-shaped guide plate in the second direction; the first arc-shaped plate contacts the arc-shaped guide plate, the second arc-shaped plate contacts the arc-shaped guide plate, the third arc-shaped plate contacts the flanged reinforcing plate, the first support plate contacts the arc-shaped guide plate, and the second support plate contacts the flanged reinforcing plate.

[0013] In some embodiments, the guide rail plate further includes a first limiting baffle and a second limiting baffle. The first limiting baffle is connected to one end of the flanged reinforcing plate and is used to limit the movement of the buckle base. The second limiting baffle is connected to the end of the flanged reinforcing plate away from the second limiting baffle and is used to limit the movement of the buckle base.

[0014] In some embodiments, the compensation part further includes a fourth arc-shaped plate, which passes through the sliding hole and is connected to the first limiting part and the second limiting part respectively; along the second direction, the fourth arc-shaped plate is located on the side of the flanged reinforcing plate away from the arc-shaped guide plate and contacts the flanged reinforcing plate and the hole wall of the sliding hole respectively; along the third direction, the fourth arc-shaped plate is located between the third arc-shaped plate and the first arc-shaped plate.

[0015] In some embodiments, the compensation part further includes a compensation plate connected to the second support plate; along the second direction, the compensation plate is located on the side of the flanged reinforcing plate opposite to the third arc-shaped plate, and the compensation plate contacts the hole wall of the sliding hole and the flanged reinforcing plate respectively; a positioning groove is formed between the third arc-shaped plate, the second support plate and the compensation plate, and at least a portion of the flanged reinforcing plate is embedded in the positioning groove.

[0016] In some embodiments, the buckle base includes a buckle bottom plate and a back plate; the buckle bottom plate includes a first plate, a second plate, a third plate, a first rivet protrusion, and a second rivet protrusion; the first plate is disposed on one side of the arc-shaped guide plate in the third direction; the second plate is connected to the first plate and disposed on one side of the flanged reinforcing plate in the second direction; the third plate is connected to the first plate and disposed on the side of the arc-shaped guide plate away from the flanged reinforcing plate; the first rivet protrusion is connected to the second plate, and the second rivet protrusion is connected to the third plate; the back plate includes a fourth plate, a fifth plate, and a sixth plate; the fourth plate is disposed on the arc-shaped guide plate in the third direction. The third plate is located on the side of the plate opposite to the first plate. The first plate has a first riveting hole. The fifth plate is connected to the fourth plate and is located on the side of the flanged reinforcing plate opposite to the second plate in the second direction. The sixth plate is connected to the fifth plate and is located on the side of the flanged reinforcing plate opposite to the first plate in the third direction. The sixth plate has a second riveting hole. The first riveting protrusion passes through the first riveting hole and the second riveting protrusion passes through the second riveting hole, so that the buckle bottom plate and the back plate are riveted and fixed. The sliding hole is formed between the first plate, the second plate, the sixth plate, the fifth plate, the fourth plate and the third plate.

[0017] In some embodiments, the locking assembly further includes a retaining ring, an opening lever, a rotating shaft, a locking torsion spring, and a locking pin; the retaining ring is connected to the retaining ring base, the opening lever is rotatably connected to the retaining ring base via the rotating shaft, the locking torsion spring is sleeved on the rotating shaft and abuts against the retaining ring base and the opening lever respectively, and one end of the locking pin is connected to the opening lever; the guide rail plate has a plurality of slots arranged sequentially along the guide direction, the number of locking pins is at least two, the number of slots is greater than the number of locking pins, the retaining ring base has through holes equal to the number of locking pins, and one locking pin passes through one through hole and one slot.

[0018] In a second aspect, the present invention also provides a seat, the seat including a seat back adjustment device according to any of the preceding claims.

[0019] Compared with the prior art, the seat back adjustment device of this invention has the following advantages:

[0020] (1) By setting an elastic compensation frame between the sliding hole wall of the buckle base and the guide rail plate, and making the elastic compensation frame contact both of them at the same time, the elastic compensation frame forms a structural area with buffering capacity between the sliding hole wall and the guide rail plate to absorb the gap between the buckle assembly and the guide rail plate. This allows the buckle base and the guide rail plate to maintain good guidance and sliding flexibility during the sliding process, and to avoid shaking or impact noise due to excessive gap between them. This improves the quietness of the seat back adjustment device during use and enhances the overall vehicle ride comfort.

[0021] (2) Compared with the existing technology that uses complex structures such as ball bearings and cages to achieve vibration reduction and noise reduction, the present invention achieves vibration reduction and noise reduction by setting an elastic compensation frame, which eliminates many precision parts, making the structure simpler, the assembly more convenient, and improving production efficiency and product consistency. At the same time, due to the simplified structure and reduced number of parts, later maintenance or replacement is more convenient, reducing maintenance difficulty and cost.

[0022] (3) The elastic compensation frame has elastic deformation capability, which can compensate for the manufacturing error between the guide plate and the buckle base to a certain extent, thereby reducing the requirements for the machining accuracy of parts, reducing mold and machining costs, and improving the interchangeability and yield of products. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the structure of a seat back adjustment device provided in Embodiment 1 of the present invention;

[0024] Figure 2 This is a front view of a seat back adjustment device provided in Embodiment 1 of the present invention;

[0025] Figure 3 This is a top view of a seat back adjustment device provided in Embodiment 1 of the present invention;

[0026] Figure 4 This is an exploded view of a seat back adjustment device provided in Embodiment 1 of the present invention;

[0027] Figure 5 This is a schematic diagram showing the connection between the locking assembly and the elastic compensation frame provided in Embodiment 1 of the present invention;

[0028] Figure 6 This is a schematic diagram of the structure of the locking base provided in Embodiment 1 of the present invention;

[0029] Figure 7 This is a schematic diagram of the first structure of the elastic compensation frame provided in Embodiment 1 of the present invention;

[0030] Figure 8This is a schematic diagram of the second structure of the elastic compensation frame provided in Embodiment 1 of the present invention;

[0031] Figure 9 This is a top view of the elastic compensation frame provided in Embodiment 1 of the present invention;

[0032] Figure 10 This is a schematic diagram of the first structure of the locking base plate provided in Embodiment 1 of the present invention;

[0033] Figure 11 This is a schematic diagram of the second structure of the locking base plate provided in Embodiment 1 of the present invention;

[0034] Figure 12 This is a schematic diagram of the structure of the back plate provided in Embodiment 1 of the present invention;

[0035] Figure 13 This is a top view of the backplate provided in Embodiment 1 of the present invention;

[0036] Figure 14 This is a schematic diagram of the connection between the opening lever and the locking pin provided in Embodiment 1 of the present invention;

[0037] Figure 15 This is an exploded view of the guide rail plate, the first mounting bracket, and the second mounting bracket provided in Embodiment 2 of the present invention.

[0038] In the diagram, 1 is the guide rail plate; 11 is the arc-shaped guide plate; 12 is the flanged reinforcing plate; 13 is the first limiting baffle; 14 is the second limiting baffle; and 111 is the slot.

[0039] 2. Locking assembly; 21. Buckle base; 22. Buckle component; 23. Opening lever; 24. Rotating shaft; 25. Locking torsion spring; 26. Locking pin; 210. Sliding hole; 211. Buckle base plate; 212. Back plate; 231. Cable wire clamp; 261. Outer overlapping surface; 262. Arc-shaped guide surface; 2111. First plate; 2112. Second plate; 2113. Third plate; 2114. First riveting protrusion; 2115. Second riveting protrusion; 2121. Fourth plate; 2122. Fifth plate; 2123. Sixth plate; 2124. First riveting hole; 2125. Second riveting hole; 2126. Through hole; 2127. Cable clamp interface;

[0040] 201. First end face; 202. Second end face;

[0041] 3. Elastic compensation frame; 31. First limiting part; 32. Second limiting part; 33. Compensation part; 34. First limiting plate; 35. Second limiting plate; 311. First limiting block; 312. First limiting strip; 321. Second limiting block; 322. Second limiting strip; 331. First arc-shaped plate; 332. Second arc-shaped plate; 333. Third arc-shaped plate; 334. First support plate; 335. Second support plate; 336. Compensation plate; 337. Fourth arc-shaped plate; 3111. First limiting surface; 3211. Second limiting surface; 3361. Positioning groove;

[0042] 4. First mounting bracket; 41. First mounting hole;

[0043] 5. Second mounting bracket; 51. Second mounting hole;

[0044] 6. Fixing rivets;

[0045] X, first direction; Y, second direction; Z, third direction. Detailed Implementation

[0046] The specific embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and are not intended to limit the scope of the invention.

[0047] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0048] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature.

[0049] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0050] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0051] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used in the description of this application is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms "comprising" and "having" and any variations thereof in the description, claims and foregoing drawings of this application are intended to cover non-exclusive inclusion.

[0052] In this application, the reference to "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment that is mutually exclusive with other embodiments.

[0053] First aspect

[0054] Example 1

[0055] like Figures 1-6 As shown, Embodiment 1 of the present invention provides a seat back adjustment device, including a guide rail plate 1, a locking assembly 2, and an elastic compensation frame 3.

[0056] The locking assembly 2 includes a buckle base 21 having a sliding hole 210, a guide plate 1 passing through the sliding hole 210, and the buckle base 21 being configured to slide along the guide plate 1; and an elastic compensation frame 3, at least a portion of which is disposed between the hole wall of the sliding hole 210 and the guide plate 1, and both the hole wall of the sliding hole 210 and the guide plate 1 are in contact with the elastic compensation frame 3.

[0057] Based on this technical solution, an elastic compensation frame 3 is set between the sliding hole 210 wall of the buckle base 21 and the guide rail plate 1, and the elastic compensation frame 3 is in contact with both at the same time. The elastic compensation frame 3 forms a structural area with buffering capacity between the sliding hole 210 wall and the guide rail plate 1 to absorb the gap between the buckle assembly 2 and the guide rail plate 1. This allows the buckle base and the guide rail plate 1 to maintain good guidance and sliding flexibility during the sliding process, and also prevents shaking or impact noise due to excessive gap between them. This improves the quietness of the seat back adjustment device during use and enhances the overall vehicle ride comfort.

[0058] Compared to existing technologies that use complex structures such as ball bearings and cages to achieve vibration and noise reduction, this invention achieves vibration and noise reduction by setting an elastic compensation frame 3. This eliminates multiple precision parts, resulting in a simpler structure, easier assembly, and improved production efficiency and product consistency. Furthermore, the simplified structure and reduced number of parts make subsequent maintenance or replacement more convenient, reducing repair difficulty and costs.

[0059] The elastic compensation frame 3 has elastic deformation capability, which can compensate for the manufacturing error between the guide plate 1 and the buckle base 21 to a certain extent, thereby reducing the requirements for the machining accuracy of parts, reducing mold and processing costs, and improving the interchangeability and yield of products.

[0060] The seat back adjustment device has two perpendicular directions, namely the first direction X, the second direction Y, and the third direction Z.

[0061] In this first embodiment, the first direction X corresponds to the X-axis direction, the second direction Y corresponds to the Y-axis direction, and the third direction Z corresponds to the Z-axis direction.

[0062] Preferably, the elastic compensation frame 3 is made of a non-metallic material with elasticity; for example, the material of the elastic compensation frame 3 may be, but is not limited to, polyurethane, rubber, silicone, thermoplastic elastomer, etc.

[0063] See Figures 1-9The elastic compensation frame 3 includes a first limiting part 31, a second limiting part 32 and a compensation part 33; the buckle base 21 is connected to the first limiting part 31 and the second limiting part 32 at both ends in the first direction X, and the compensation part 33 passes through the sliding hole 210. The first limiting part 31 and the second limiting part 32 are both connected to the compensation part 33, and the hole wall of the sliding hole 210 and the guide plate 1 are in contact with the compensation part 33.

[0064] By inserting the compensation part 33 through the sliding hole 210 and contacting the hole wall and guide rail plate 1, the compensation part 33 can continuously provide elastic support during the sliding of the locking assembly 2, further optimizing the buffering and shock absorption effect, making the locking assembly 2 more stable and smooth during sliding, and without obvious abnormal noise. By defining the first limiting part 31 and the second limiting part 32 at both ends of the buckle base 21 in the first direction X, the relative positional relationship between the elastic compensation frame 3 and the buckle base 21 is clarified, enabling the elastic compensation frame 3 to achieve quick and accurate positioning during assembly, facilitating the assembly between the elastic compensation frame 3 and the buckle base 21. Furthermore, the first limiting part 31 and the second limiting part 32 limit the compensation part 33, making it less likely for the compensation part 33 to shift or fall off during use, thereby ensuring that the compensation part 33 always maintains good contact with the hole wall and guide rail plate 1 of the sliding hole 210, maintaining stable buffering performance, and improving the overall reliability and safety of the device.

[0065] See Figures 5-11 The buckle base 21 has a first end face 201 and a second end face 202 that are disposed opposite to each other. The first limiting part 31 has a first limiting surface 3111 that is in contact with the first end face 201, and the second limiting part 32 has a second limiting surface 3211 that is in contact with the second end face 202.

[0066] By setting the first limiting surface 3111 to fit with the first end face 201 and the second limiting surface 3211 to fit with the second end face 202, a stable surface contact fit is formed between the elastic compensation frame 3 and the buckle base 21, limiting the relative position between the two and preventing the elastic compensation frame 3 from shifting or loosening during use, thereby ensuring that it is always in the predetermined working position.

[0067] The first limiting part 31 includes a plurality of first limiting blocks 311 and a plurality of first limiting strips 312 arranged alternately. Two first limiting blocks 311 are connected by a first limiting strip 312. The first limiting block 311 has a first limiting surface 3111. The compensation part 33 is connected to the first limiting block 311 and / or the first limiting strip 312. Specifically, in this embodiment, the first limiting part 31 includes three first limiting blocks 311 and four first limiting strips 312.

[0068] The second limiting part 32 includes a plurality of second limiting blocks 321 and a plurality of second limiting strips 322 arranged alternately. Two second limiting blocks 321 are connected by a second limiting strip 322. The second limiting block 321 has a second limiting surface 3211. The compensation part 33 is connected to the second limiting block 321 and / or the second limiting strip 322.

[0069] Specifically, in this first embodiment, the second limiting part 32 includes three second limiting blocks 321 and four second limiting strips 322.

[0070] See Figures 1-4 In this first embodiment, the guide trajectory of the guide rail plate 1 is an arc-shaped trajectory.

[0071] In this first embodiment, the seat adjustment device is used to adjust the angle between the seat back and the seat cushion. Since the seat back flips along an arc, when the latch assembly 2 is installed on the back, the movement trajectory of the latch assembly 2 with the seat back is also an arc coaxial with the rotating shaft 24. Therefore, in order to avoid the misalignment caused by the misalignment between the movement trajectory of the latch assembly 2 driven by the back and the guiding direction of the guide rail plate 1, the guiding trajectory of the guide rail in this embodiment is an arc-shaped trajectory, so that the guiding trajectory of the guide rail plate 1 and the rotation trajectory of the back are both coaxial with the rotating shaft 24, avoiding abnormal noise and movement difficulties caused by the misalignment between the latch assembly 2 and the guide rail plate 1. Specifically, the guide rail plate 1 in this embodiment is an arc-shaped plate formed by a bending process.

[0072] See Figure 2 The guide rail 1 includes an arc-shaped guide plate 11 and a flanged reinforcing plate 12, with the flanged reinforcing plate 12 connected to one end of the arc-shaped guide plate 11 in the second direction Y. By setting the flanged reinforcing plate 12 and connecting it to the arc-shaped guide plate 11, the overall structural rigidity of the guide rail 1 is enhanced, and the resistance to deformation of the guide rail 1 during the sliding process of the locking assembly 2 is improved, thereby improving the stability and durability of the seat back adjustment device in long-term use.

[0073] The guide rail plate 1 also includes a first limiting baffle 13 and a second limiting baffle 14. The first limiting baffle 13 is connected to one end of the flanged reinforcing plate 12 and is used to limit the movement of the buckle base 21. The second limiting baffle 14 is connected to the end of the flanged reinforcing plate 12 away from the second limiting baffle 14 and is used to limit the movement of the buckle base 21.

[0074] The first limiting baffle 13 and the second limiting baffle 14 are respectively disposed at both ends of the flanged reinforcing plate 12, which can limit the sliding range of the locking base on the guide rail plate 1, prevent it from slipping off the guide rail or affecting the adjustment function due to excessive sliding, thereby improving the operational safety and stability of the adjustment device.

[0075] See Figures 1-4The seat back adjustment device also includes a first mounting bracket 4 and a second mounting bracket 5. The first mounting bracket 4 is connected to one end of the guide rail plate 1 and has a first mounting hole 41. The second mounting bracket 5 is connected to the end of the guide rail plate 1 away from the first mounting bracket 4 and has a second mounting hole 51.

[0076] In this first embodiment, the first mounting bracket 4, the guide rail plate 1, and the second mounting bracket 5 are integrally formed.

[0077] See Figures 1-9 The compensation part 33 includes a first arc plate 331, a second arc plate 332, a third arc plate 333, a first support plate 334, and a second support plate 335. The first arc plate 331, the second arc plate 332, and the third arc plate 333 are all inserted through the sliding hole 210. The first arc plate 331, the second arc plate 332, and the third arc plate 333 are all connected to the first limiting part 31. The first arc plate 331, the second arc plate 332, and the third arc plate 333 are all connected to the second limiting part 32. The first support plate 334 is connected to the second arc plate 332, and the second support plate 335 is connected to the third arc plate 333.

[0078] Along the third direction Z, the first arc plate 331 is located on one side of the guide plate 1 and contacts the guide plate 1 and the hole wall of the sliding hole 210 respectively. The first support plate 334 and the second support plate 335 are both located on the side of the guide plate 1 away from the first arc plate 331. The first support plate 334 contacts the guide plate 1 and the hole wall of the sliding hole 210 respectively, and the second support plate 335 contacts the guide plate 1 and the hole wall of the sliding hole 210 respectively.

[0079] Along the second direction Y, the second arc plate 332 is located on one side of the guide plate 1 and contacts the guide plate 1 and the hole wall of the sliding hole 210 respectively, and the third arc plate 333 is located on the side of the guide plate 1 away from the second arc plate 332 and contacts the guide plate 1 and the hole wall of the sliding hole 210 respectively.

[0080] By positioning the first arc-shaped plate 331 on one side of the guide rail plate 1 in the third direction Z, and the first support plate 334 and the second support plate 335 on the other side of the guide rail plate 1, respectively contacting the guide rail plate 1 and the sliding hole 210, the elastic compensation frame 3 can maintain a good fit with the guide rail plate 1 in the third direction Z during the sliding of the locking base, avoiding shaking or jamming caused by uneven force and ensuring a smooth sliding process. Similarly, by positioning the second arc-shaped plate 332 on one side of the guide rail plate 1 in the second direction Y, and the third arc-shaped plate 333 on the other side of the guide rail plate 1, respectively contacting the guide rail plate 1 and the sliding hole 210, the elastic compensation frame 3 can maintain a good fit with the guide rail plate 1 in the second direction Y during the sliding of the locking base.

[0081] Because the guide track of the guide plate 1 is an arc-shaped trajectory, the tangential direction between the latch assembly 2 and the guide plate 1 changes constantly during the sliding process, causing gaps in different directions to occur between the wall of the sliding hole 210 and the guide plate 1 at different positions, which in turn causes shaking or abnormal noise. The present invention, by setting a first arc-shaped plate 331, a second arc-shaped plate 332, and a third arc-shaped plate 333 in multiple directions to contact the guide plate 1 and the wall of the sliding hole 210, can adapt well to the arc-shaped guide track of the guide plate 1. During the sliding process of the latch assembly 2 along the arc-shaped trajectory, it dynamically compensates for the changes in the gap between the latch assembly 2 and the guide plate 1, ensuring that the latch assembly 2 always maintains good contact with the guide plate 1, thereby improving the sliding stability and noise reduction performance.

[0082] In this first embodiment, a first limiting block 311 and a second limiting block 321 are respectively connected to the two ends of the first arc plate 331, a first limiting strip 312 and a second limiting strip 322 are respectively connected to the two ends of the second arc plate 332, and a first limiting strip 312 and a second limiting strip 322 are respectively connected to the two ends of the third arc plate 333.

[0083] The vertex of the first arc plate 331 contacts the wall of the sliding hole 210, and the base point of the first arc plate 331 contacts the guide rail plate 1; the vertex of the second arc plate 332 contacts the wall of the sliding hole 210, and the base point of the second arc plate 332 contacts the guide rail plate 1; the vertex of the third arc plate 333 contacts the guide rail plate 1, and the base point of the third arc plate 333 contacts the wall of the sliding hole 210.

[0084] The first arc plate 331 is located on one side of the guide rail plate 1 in the third direction Z. The apex of the first arc plate 331 contacts the wall of the sliding hole 210, and the base point contacts the guide rail plate 1. It can dynamically fit the surface of the guide rail plate 1 when the locking assembly 2 slides along the arc trajectory, realizing the buffering and guiding function in the sliding direction. The arc structure of the first arc plate 331 can effectively absorb the vertical vibration generated by the locking assembly 2 during the sliding process, and prevent abnormal noise or shaking caused by excessive gap.

[0085] The second arc-shaped plate 332 is located on one side of the guide rail plate 1 in the second direction Y. The apex of the second arc-shaped plate 332 contacts the wall of the sliding hole 210, and the base point contacts the guide rail plate 1. The second arc-shaped plate 332 mainly serves to buffer the lateral force generated by the angle change of the locking assembly 2 during sliding, preventing the locking assembly 2 from shifting or tilting due to uneven force during sliding, thereby improving the operational stability of the adjustment device under complex working conditions. The third arc-shaped plate 333 is located on the side of the guide rail plate 1 opposite to the second arc-shaped plate 332 in the second direction Y. The apex of the third arc-shaped plate 333 contacts the guide rail plate 1, and the base point contacts the wall of the sliding hole 210. It is used to provide a lateral force opposite to that of the second arc-shaped plate 332 when the force direction of the locking assembly 2 changes, improving the anti-eccentric load capacity of the elastic compensation frame 3, further ensuring that the locking assembly 2 always maintains good contact with the guide rail plate 1, and further improving the sliding stability and noise reduction performance.

[0086] It should be noted that, in this invention, an arc-shaped plate refers to a curved plate-like component with a centrally symmetrical structure, extending in an arc shape along its length or width to achieve specific support, guidance, or buffering functions. A "vertex" refers to the highest point on the arc-shaped plate's curved profile, i.e., the geometrically highest point of the arc-shaped plate facing external space or in the direction of force when assembled. This point is usually located in the middle of the arc-shaped plate and constitutes its highest structural support point. In this invention, the vertex is a key part where the arc-shaped plate contacts or engages with external structures (such as the wall of the sliding hole 210 or the guide rail plate 1), playing a crucial role in achieving structural positioning and force distribution. A "base point" refers to the lowest point at the two edges of the arc-shaped plate, i.e., the position where the arc-shaped plate contacts or fits with its mounting base (such as the guide rail plate 1 or the wall of the sliding hole 210) when assembled. Base points usually appear in pairs, symmetrically arranged on both sides of the vertex, serving as one of the main support points of the arc-shaped plate, used to transfer the load from the vertex to the guide rail plate 1 or other load-bearing structures, thereby improving the stability and reliability of the overall connection.

[0087] The first arc plate 331, the second arc plate 332, and the third arc plate 333 are respectively set at multiple positions in multiple directions. Each of them undertakes the force and compensation tasks at different positions, realizing the synergistic effect of buffering in multiple directions, dynamic gap compensation, and stable guidance. This can not only improve the adaptability of the seat back adjustment device at different angles, but also further enhance its shock absorption and noise reduction performance, sliding smoothness, and structural durability.

[0088] Preferably, there are multiple first arc-shaped plates 331, which are spaced apart along the second direction Y. Compared with using a single large arc-shaped plate, multiple spaced first arc-shaped plates 331 can reduce material usage while maintaining the same buffering compensation function, thereby reducing manufacturing costs.

[0089] In this first embodiment, there are two first arc-shaped plates 331.

[0090] The elastic compensation frame 3 also includes two first limiting plates 34 and two second limiting plates 35; there are two first support plates 334, one first support plate 334 is connected to one first limiting plate 34, and there are two second support plates 335, one second support plate 335 is connected to one second limiting plate 35; along the first direction X, the buckle base 21 is located between the two first limiting plates 34 and between the two second limiting plates 35.

[0091] By setting two first limiting plates 34 and two second limiting plates 35, and placing the buckle base 21 between them, bidirectional limiting of the buckle base 21 in the first direction X is achieved, providing a clear positioning reference for the assembly between the elastic compensation frame 3 and the buckle base 21, enabling the two to quickly align and maintain a stable spatial relationship during the assembly process, facilitating rapid assembly between the two.

[0092] Preferably, along the first direction X, the two ends of the buckle base 21 contact the two first limiting plates 34 respectively, and the two ends of the buckle base 21 contact the two second limiting plates 35 respectively.

[0093] The first arc-shaped plate 331 contacts the arc-shaped guide plate 11, i.e., along the third direction Z, and the first arc-shaped plate 331 is located between the arc-shaped guide plate 11 and the wall of the sliding hole 210; the second arc-shaped plate 332 contacts the arc-shaped guide plate 11, i.e., along the second direction Y, and the second arc-shaped plate 332 is located between the arc-shaped guide plate 11 and the wall of the sliding hole 210; the third arc-shaped plate 333 contacts the flanged reinforcing plate 12, i.e., along the second direction Y, and the third arc-shaped plate 333 is located between the flanged reinforcing plate 12 and the wall of the sliding hole 210; the first support plate 334 contacts the arc-shaped guide plate 11, i.e., along the third direction Z, and the first support plate 334 is located between the arc-shaped guide plate 11 and the wall of the sliding hole 210; the second support plate 335 contacts the flanged reinforcing plate 12, i.e., along the third direction Z, and the first support plate 334 is located between the flanged reinforcing plate 12 and the wall of the sliding hole 210.

[0094] The first arc plate 331, the second arc plate 332, the third arc plate 333, the first support plate 334, and the second support plate 335 respectively contact the arc guide plate 11 or the flanged reinforcing plate 12, so that the elastic compensation frame 3 can form a multi-point contact structure with the guide rail plate 1. This allows the elastic compensation frame 3 to dynamically compensate for the gap change between the sliding hole 210 wall of the lock base and the guide rail plate 1 according to the sliding path of the locking assembly 2, ensuring that the locking assembly 2 always maintains good contact with the guide rail plate 1, improving sliding stability and noise reduction performance.

[0095] The compensation part 33 also includes a fourth arc-shaped plate 337, which passes through the sliding hole 210 and is connected to the first limiting part 31 and the second limiting part 32 respectively; along the second direction Y, the fourth arc-shaped plate 337 is located on one side of the flange reinforcing plate 12 and contacts the flange reinforcing plate 12 and the hole wall of the sliding hole 210 respectively; along the third direction Z, the fourth arc-shaped plate 337 is located between the third arc-shaped plate 333 and the first arc-shaped plate 331.

[0096] During the sliding of the latch assembly 2 along the arc-shaped trajectory, the fourth arc plate 337 and the third arc plate 333 work together to dynamically compensate for the gap changes between the wall of the sliding hole 210 and the flange reinforcement plate 12, ensuring that the flange reinforcement plate 12 always maintains good contact with the wall of the sliding hole 210 through the third arc plate 333 and the fourth arc plate 337, further improving the sliding stability and noise reduction performance.

[0097] In this first embodiment, the two ends of the fourth arc plate 337 are respectively connected to a second limiting block 321 and a second limiting block 321.

[0098] In this first embodiment, the apex of the fourth arc plate 337 contacts the guide rail plate 1, and the base point of the fourth arc plate 337 contacts the wall of the sliding hole 210.

[0099] The compensation section 33 also includes a compensation plate 336, which is connected to the second support plate 335. Along the second direction Y, the compensation plate 336 is located on the side of the flanged reinforcing plate 12 away from the third arc-shaped plate 333. The compensation plate 336 contacts the wall of the sliding hole 210 and the flanged reinforcing plate 12 respectively. A positioning groove 3361 is formed between the third arc-shaped plate 333, the second support plate 335 and the compensation plate 336. At least a portion of the flanged reinforcing plate 12 is embedded in the positioning groove 3361.

[0100] By placing the compensation plate 336 between the flanged reinforcing plate 12 and the wall of the sliding hole 210, the compensation plate 336 can undergo slight deformation or fit according to the actual assembly situation between the flanged reinforcing plate 12 and the wall of the sliding hole 210, thereby compensating for manufacturing or assembly errors between the two, improving the tightness and stability of the structure, and preventing shaking or abnormal noise caused by excessive gap.

[0101] The positioning groove 3361 formed by the third arc plate 333, the second support plate 335 and the compensation plate 336 provides a clear assembly positioning benchmark for the flanged reinforcing plate 12, enabling the guide rail plate 1 and the elastic compensation frame 3 to be quickly aligned and accurately installed during the assembly process, thereby improving assembly efficiency and product consistency.

[0102] See Figures 1-6 ,and Figures 10-13The buckle base 21 includes a buckle base plate 211 and a back plate 212. The buckle base plate 211 is connected to the back plate 212 and forms a sliding hole 210.

[0103] The buckle base plate 211 includes a first plate 2111, a second plate 2112, a third plate 2113, a first riveting protrusion 2114, and a second riveting protrusion 2115. The first plate 2111 is located on one side of the arc-shaped guide plate 11 in the third direction Z. The second plate 2112 is connected to the first plate 2111 and is located on one side of the flanged reinforcing plate 12 in the second direction Y. The third plate 2113 is connected to the first plate 2111 and is located on the side of the arc-shaped guide plate 11 away from the flanged reinforcing plate 12. The first riveting protrusion 2114 is connected to the second plate 2112, and the second riveting protrusion 2115 is connected to the third plate 2113.

[0104] The back plate 212 includes a fourth plate 2121, a fifth plate 2122, and a sixth plate 2123. The fourth plate 2121 is located on the side of the arc-shaped guide plate 11 facing away from the first plate 2111 in the third direction Z. The first plate 2111 is provided with a first riveting hole 2124. The fifth plate 2122 is connected to the fourth plate 2121 and is located on the side of the flanged reinforcing plate 12 facing away from the second plate 2112 in the second direction Y. The sixth plate 2123 is connected to the fifth plate 2122 and is located on the side of the flanged reinforcing plate 12 facing away from the first plate 2111 in the third direction Z. The sixth plate 2123 is provided with a second riveting hole 2125.

[0105] The first riveting protrusion 2114 passes through the first riveting hole 2124 and the second riveting protrusion 2115 passes through the second riveting hole 2125, so that the buckle bottom plate 211 and the back plate 212 are riveted and fixed. The first plate 2111, the second plate 2112, the sixth plate 2123, the fifth plate 2122, the fourth plate 2121 and the third plate 2113 form a sliding hole 210.

[0106] That is, the sidewalls of the first plate 2111, the second plate 2112, the sixth plate 2123, the fifth plate 2122, and the fourth plate 2121 constitute the wall of the sliding hole 210; specifically, in this embodiment, along the third direction Z, the first arc-shaped plate 331 is located between the arc-shaped guide plate 11 and the first plate 2111 to contact the arc-shaped guide plate 11 and the first plate 2111 respectively, the first support plate 334 is located between the arc-shaped guide plate 11 and the third plate 2113 to contact the first support plate 334 is located between the arc-shaped guide plate 11 and the third plate 2113 respectively, and the second support plate 335 is located between the flanged reinforcing plate 12 and the fifth plate 2122 to contact the flanged reinforcing plate 12 and the fifth plate 2122 respectively. Along the second direction Y, the second arc-shaped plate 332 is located between the arc-shaped guide plate 11 and the third plate 2113 to contact the arc-shaped guide plate 11 and the third plate 2113 respectively; the third arc-shaped plate 333 is located between the flanged reinforcing plate 12 and the second plate 2112 to contact the flanged reinforcing plate 12 and the second plate 2112 respectively; and the fourth arc-shaped plate 337 is located between the flanged reinforcing plate 12 and the fifth plate 2122 to contact the flanged reinforcing plate 12 and the fifth plate 2122 respectively.

[0107] The fastener base plate 211 and back plate 212 are fixed by riveting, avoiding the complexity and increased cost of traditional screwing or welding processes. The riveting fit between the first riveting protrusion 2114 and the first riveting hole 2124, and between the second riveting protrusion 2115 and the second riveting hole 2125, makes the connection between the fastener base plate 211 and the back plate 212 more secure and reliable, while simplifying the assembly process and improving assembly efficiency and connection strength. Preferably, there are multiple first riveting holes 2124 and multiple first riveting protrusions 2114, with one first riveting protrusion 2114 corresponding to one first riveting hole 2124; there are also multiple second riveting holes 2125 and multiple second riveting protrusions 2115, with one second riveting protrusion 2115 corresponding to one second riveting hole 2125. Specifically, in this embodiment, there are two of each of the first riveting hole 2124, the first riveting protrusion 2114, the second riveting hole 2125, and the second riveting protrusion 2115.

[0108] Multiple plates of the buckle base plate 211 and multiple plates of the back plate 212 are rationally arranged in different directions to form a three-dimensional structural frame around the sliding hole 210, which enhances the overall rigidity and deformation resistance of the buckle base 21. This structure can effectively bear the complex loads on the locking assembly 2 during sliding, ensuring the stable operation of the seat back adjustment device under various operating conditions. At the same time, the sliding hole 210 is surrounded by the side walls of the first plate 2111, the second plate 2112, the third plate 2113, the fourth plate 2121, the fifth plate 2122, and the sixth plate 2123. Its shape is highly matched with the spatial layout of the guide rail plate 1, which can provide good guidance and limiting function for the guide rail plate 1 and improve the smoothness of sliding between the two.

[0109] The buckle base plate 211 has a first end face 201 and a second end face 202.

[0110] The back panel 212 is equipped with a cable card interface 2127.

[0111] The assembly process of the guide rail plate 1, buckle base plate 211, back plate 212, and elastic compensation frame 3 provided by the present invention is as follows: the buckle is fixedly connected to the buckle base plate 211, and the elastic compensation frame 3 is fitted onto the guide rail plate 1. The buckle base plate 211 and the back plate 212 pass through the buckle through hole 2126 via a buckle protrusion to form a sliding hole 210, and the elastic compensation frame 3 is located in the sliding hole 210. During the production process, the buckle protrusion will eventually become a buckled state through the buckle process, thereby realizing the fixed connection between the buckle base plate 211 and the back plate 212.

[0112] See Figures 1-5 ,and Figure 14 The locking assembly 2 also includes a retaining ring 22, an opening lever 23, a rotating shaft 24, a locking torsion spring 25, and a locking pin 26; the retaining ring 22 is connected to the retaining ring base 21, the opening lever 23 is rotatably connected to the retaining ring base 21 via the rotating shaft 24, the locking torsion spring 25 is sleeved on the rotating shaft 24 and abuts against the retaining ring base 21 and the opening lever 23 respectively, and one end of the locking pin 26 is connected to the opening lever 23;

[0113] The guide rail plate 1 is provided with a plurality of slots 111 arranged sequentially and evenly spaced along the guide direction. The number of locking pins 26 is at least two. The number of slots 111 is greater than the number of locking pins 26. The buckle base 21 is provided with through holes 2126 equal to the number of locking pins 26. One locking pin 26 passes through one through hole 2126 and one slot 111.

[0114] Specifically, the buckle 22 is connected to the buckle base plate 211, the opening lever 23 is rotatably connected to the back plate 212 via the rotating shaft 24, the two overlapping ends of the locking torsion spring 25 abut against the back plate 212 and the opening lever 23 respectively, the slot 111 is provided on the arc-shaped guide plate 11, and the through hole 2126 is provided on the back plate 212.

[0115] Preferably, the number of card slots 111 is ten or more. Specifically, in this embodiment, the number of card slots 111 is twenty-two.

[0116] In this embodiment, there are four locking pins 26 and four through holes 2126.

[0117] The opening lever 23 is equipped with a cable wire clamp 231.

[0118] The locking assembly 2 also includes a cable (not shown), which consists of a cable wire and a cable sleeve. The cable sleeve connects to the cable locking interface 2127, and the cable wire connects to the cable wire locking slot 231. By operating the cable wire, the opening lever 23 overcomes the elastic force of the locking torsion spring 25, causing the locking pin 26 to disengage from the locking groove 111, thereby enabling sliding between the locking assembly 2 and the guide plate 1. If the cable wire is operated in the opposite direction, the locking pin 26 will re-engage with the locking groove 111 under the spring force of the locking torsion spring 25, thus fixing and restricting the sliding.

[0119] In this embodiment, the locking pin 26 is a square locking pin 26, and the locking groove 111 is a square locking groove 111 adapted to the locking pin 26. The square locking pin 26 has four outer overlapping surfaces 261, and the square locking groove 111 has four inner overlapping surfaces that cooperate with the four overlapping surfaces.

[0120] The outer peripheral wall of the end of the locking pin 26 away from the opening lever 23 has an arc-shaped guide surface 262 that curves inward toward the opening lever 23. Thus, as the locking pin 26 is inserted into the slot 111, it can gradually approach the inner wall of the slot 111 via the arc-shaped guide surface 262 until it comes into close contact with the inner wall of the slot 111. This helps reduce the precision requirements for the spacing and size of the two slots 111 and the spacing between the two locking pins 26, reducing production costs and eliminating the gap between the locking pin 26 and the slot 111 when they are locked, further eliminating noise caused by gap movement.

[0121] To allow for more stopping and locking positions, the slot 111 is designed with a series of arrangements, and the locking pins 26 are also designed with corresponding spacing. While ensuring strength and manufacturability, the locking pins 26 are made as small and close together as possible, as are the slots 111. Furthermore, to mitigate manufacturing tolerances, the present invention designs the locking pins 26 such that only two surfaces fully overlap with the slot 111, while the other surfaces have gaps. Only when subjected to excessive strength is all the outer overlapping surfaces 261 of the locking pins 26 allowed to fully contact all the inner overlapping surfaces of the slot 111.

[0122] Example 2

[0123] See Figure 15The only difference from Embodiment 1 is that the seat back adjustment device provided in Embodiment 2 is that the first mounting bracket 4, the guide rail plate 1, and the second mounting bracket 5 are set separately.

[0124] Specifically, in this second embodiment, the first mounting bracket 4 is fixedly connected to the guide rail plate 1 by the fixing rivet 6, and the second mounting bracket 5 is fixedly connected to the guide rail plate 1 by the fixing rivet 6.

[0125] In some other embodiments, the first mounting bracket 4 can also be fixedly connected to one end of the guide rail plate 1 by welding, screwing or other means, and the second mounting bracket 5 can also be fixedly connected to the other end of the guide rail plate 1 by welding, screwing or other means.

[0126] In a second aspect, the present invention also provides a seat, the seat including a seat back adjustment device according to any of the preceding claims.

[0127] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and substitutions can be made without departing from the technical principles of the present invention, and these improvements and substitutions should also be considered within the scope of protection of the present invention.

Claims

1. A seat backrest adjustment device, characterized in that, include: Guide rail plate; A locking assembly includes a buckle base having a sliding hole, a guide plate passing through the sliding hole, and the buckle base being configured to slide along the guide plate. An elastic compensation frame is at least partially disposed between the wall of the sliding hole and the guide rail plate, and both the wall of the sliding hole and the guide rail plate are in contact with the elastic compensation frame. The seat back adjustment device has two perpendicular directions: a first direction, a second direction, and a third direction. The elastic compensation frame includes a first limiting part, a second limiting part, and a compensation part; the buckle base is connected to the first limiting part and the second limiting part at both ends in the first direction, the compensation part passes through the sliding hole, the first limiting part and the second limiting part are both connected to the compensation part, and the hole wall of the sliding hole and the guide plate are both in contact with the compensation part; The guide rail plate has an arc-shaped guide trajectory; The compensation part includes a first arc-shaped plate, a second arc-shaped plate, a third arc-shaped plate, a first support plate, and a second support plate. The first arc-shaped plate, the second arc-shaped plate, and the third arc-shaped plate are all disposed through the sliding hole. The first arc-shaped plate, the second arc-shaped plate, and the third arc-shaped plate are all connected to the first limiting part. The first arc-shaped plate, the second arc-shaped plate, and the third arc-shaped plate are all connected to the second limiting part. The first support plate is connected to the second arc-shaped plate, and the second support plate is connected to the third arc-shaped plate. Along the third direction, the first arc-shaped plate is located on one side of the guide rail plate and contacts the guide rail plate and the hole wall of the sliding hole respectively. The first support plate and the second support plate are both located on the side of the guide rail plate away from the first arc-shaped plate. The first support plate contacts the guide rail plate and the hole wall of the sliding hole respectively, and the second support plate contacts the guide rail plate and the hole wall of the sliding hole respectively. Along the second direction, the second arc-shaped plate is located on one side of the guide rail plate and contacts the guide rail plate and the hole wall of the sliding hole respectively, and the third arc-shaped plate is located on the side of the guide rail plate opposite to the second arc-shaped plate and contacts the guide rail plate and the hole wall of the sliding hole respectively.

2. The seat back adjustment device according to claim 1, characterized in that, The buckle base has a first end face and a second end face that are disposed opposite to each other. The first limiting part has a first limiting surface that fits and contacts the first end face, and the second limiting part has a second limiting surface that fits and contacts the second end face.

3. The seat back adjustment device according to claim 1, characterized in that, The apex of the first arc-shaped plate contacts the wall of the sliding hole, and the base point of the first arc-shaped plate contacts the guide rail plate. The apex of the second arc-shaped plate contacts the wall of the sliding hole, and the base point of the second arc-shaped plate contacts the guide rail plate; The apex of the third arc-shaped plate contacts the guide rail plate, and the base point of the third arc-shaped plate contacts the wall of the sliding hole.

4. The seat back adjustment device according to claim 1, characterized in that, The number of the first arc-shaped plates is multiple, and the multiple first arc-shaped plates are spaced apart along the second direction.

5. The seat back adjustment device according to claim 1, characterized in that, The elastic compensation frame also includes two first limiting plates and two second limiting plates; There are two first support plates, one of which is connected to one first limiting plate; there are also two second support plates, one of which is connected to one second limiting plate. Along the first direction, the buckle base is located between the two first limiting plates, and the buckle base is located between the two second limiting plates.

6. The seat back adjustment device according to claim 1, characterized in that, The guide plate includes an arc-shaped guide plate and a flanged reinforcing plate, wherein the flanged reinforcing plate is connected to one end of the arc-shaped guide plate in the second direction; The first arc-shaped plate contacts the arc-shaped guide plate, the second arc-shaped plate contacts the arc-shaped guide plate, the third arc-shaped plate contacts the flanged reinforcing plate, the first support plate contacts the arc-shaped guide plate, and the second support plate contacts the flanged reinforcing plate.

7. The seat back adjustment device according to claim 6, characterized in that, The guide rail plate further includes a first limiting baffle and a second limiting baffle. The first limiting baffle is connected to one end of the flanged reinforcing plate and is used to limit the movement of the buckle base. The second limiting baffle is connected to the end of the flanged reinforcing plate away from the second limiting baffle and is used to limit the movement of the buckle base.

8. The seat back adjustment device according to claim 6, characterized in that, The compensation part further includes a fourth arc-shaped plate, which passes through the sliding hole and is respectively connected to the first limiting part and the second limiting part; Along the second direction, the fourth arc-shaped plate is located on the side of the flanged reinforcing plate opposite to the arc-shaped guide plate and contacts the flanged reinforcing plate and the hole wall of the sliding hole respectively; Along the third direction, the fourth arc-shaped plate is located between the third arc-shaped plate and the first arc-shaped plate.

9. The seat back adjustment device according to claim 6, characterized in that, The compensation part further includes a compensation plate connected to the second support plate; along the second direction, the compensation plate is located on the side of the flanged reinforcing plate away from the third arc-shaped plate, and the compensation plate contacts the wall of the sliding hole and the flanged reinforcing plate respectively; a positioning groove is formed between the third arc-shaped plate, the second support plate and the compensation plate, and at least a portion of the flanged reinforcing plate is embedded in the positioning groove.

10. The seat back adjustment device according to claim 6, characterized in that, The buckle base includes a buckle base plate and a back plate; The buckle base plate includes a first plate, a second plate, a third plate, a first riveting protrusion, and a second riveting protrusion. The first plate is disposed on one side of the arc-shaped guide plate in the third direction. The second plate is connected to the first plate and disposed on one side of the flanged reinforcing plate in the second direction. The third plate is connected to the first plate and disposed on the side of the arc-shaped guide plate away from the flanged reinforcing plate. The first riveting protrusion is connected to the second plate, and the second riveting protrusion is connected to the third plate. The back plate includes a fourth plate, a fifth plate, and a sixth plate. The fourth plate is disposed on the side of the arc-shaped guide plate opposite to the first plate in the third direction. The first plate is provided with a first riveting hole. The fifth plate is connected to the fourth plate and is located on the side of the flanged reinforcing plate opposite to the second plate in the second direction. The sixth plate is connected to the fifth plate and is located on the side of the flanged reinforcing plate opposite to the first plate in the third direction. The sixth plate is provided with a second riveting hole. The first riveting protrusion passes through the first riveting hole and the second riveting protrusion passes through the second riveting hole, so that the buckle base plate and the back plate are riveted and fixed. The sliding hole is formed between the first plate, the second plate, the sixth plate, the fifth plate, the fourth plate and the third plate.

11. The seat back adjustment device according to any one of claims 1-10, characterized in that, The locking assembly also includes a buckle, an opening lever, a rotating shaft, a locking torsion spring, and a locking pin; the buckle is connected to the buckle base, the opening lever is rotatably connected to the buckle base via the rotating shaft, the locking torsion spring is sleeved on the rotating shaft and abuts against the buckle base and the opening lever respectively, and one end of the locking pin is connected to the opening lever; The guide rail plate is provided with a plurality of slots arranged sequentially along the guide direction. The number of the locking pins is at least two, and the number of slots is greater than the number of locking pins. The buckle base is provided with through holes equal to the number of locking pins. One locking pin passes through one through hole and one slot.

12. A type of seat, characterized in that, Includes the seat back adjustment device according to any one of claims 1-11.

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