A seat angle adjustment device

Abstract

This application provides a seat angle adjustment device, including a base and a locking / unlocking structure. The base includes an outer support member and an inner support member, with the outer support member sleeved on the inner support member. A pivot is passed through both the outer and inner support members. The inner support member is connected to the seat's support column, and the outer support member is connected to the seat cushion. The locking / unlocking structure includes an operating lever, a locking plate assembly, a locking drive structure, and an unlocking drive structure. The locking / unlocking structure satisfies the need for arbitrary tilt angle adjustment of the seat cushion.

Description

Technical Field

[0001] This utility model relates to the field of seat technology, and in particular to a seat angle adjustment device. Background Technology

[0002] In some chairs, the backrest is fixed to the seat cushion. The tilt angle of the backrest cannot be adjusted, so users cannot lean back significantly when sitting on it.

[0003] In the existing technology, in order to meet the need for reclining, this type of chair adopts the method of adjustable seat cushion tilt angle. However, the existing technology cannot achieve arbitrary tilt angle adjustment of the seat cushion, and cannot meet the needs of various users.

[0004] Therefore, there are still problems in the existing technology that need to be solved. Utility Model Content

[0005] The main purpose of this invention is to provide a seat angle adjustment device that aims to meet the need for adjusting the seat cushion to any tilt angle.

[0006] To achieve the above objectives, the present invention proposes a seat angle adjustment device, comprising a base and a locking / unlocking structure; the base includes an outer support member and an inner support member, the outer support member being sleeved on the inner support member, and a rotating shaft passing through the outer and inner support members; the inner support member is connected to the seat support column, and the outer support member is connected to the seat cushion; the locking / unlocking structure includes an operating lever, a locking plate assembly, a locking drive structure, and an unlocking drive structure; the operating lever includes a horizontal shaft, which is axially movable and fixed to the outer support member; the locking plate assembly includes multiple parallel and spaced sliding plates and multiple parallel... The locking plates are spaced apart and fixedly mounted on the horizontal shaft, interleaving with the sliding plates. The sliding plates are fixed to the inner support and have travel holes through which the horizontal shaft passes. The locking drive structure is an elastic reset structure, so that the horizontal shaft returns to the locked position when no external force is applied. When the horizontal shaft is in the locked position, the locking plates and the sliding plates abut tightly against each other to lock each other. The unlocking drive structure includes a driving ramp, so that when the horizontal shaft rotates, the ramp drives the horizontal shaft to move axially to the unlocked position. When the horizontal shaft is in the unlocked position, the locking plates and the sliding plates release each other to slide relative to each other.

[0007] Preferably, the inner support member includes a first inner support sub-member and a second inner support sub-member; the first inner support sub-member has a first through hole, and the second inner support sub-member has a fixing part, which passes through the first through hole and extends out of the first inner support sub-member; the slider is fixed to the fixing part.

[0008] Preferably, the inner support member has a fixing part, the fixing part has a second through hole, the slide has a third through hole, and the second and third through holes are non-circular holes; the second and third through holes are provided with fixing members that are adapted to the second and third through holes so that the slide is fixed to the fixing part.

[0009] Preferably, the elastic reset structure is configured as a spring, and the outer support is provided with a first abutment for one end of the spring to abut against; the end of the horizontal shaft is formed with a screw hole and screwed with a bolt having a second abutment, and the other end of the spring abuts against the second abutment.

[0010] Preferably, the outer support member is provided with a third abutment member; when the horizontal axis is in the locked position, the locking plate group presses against the third abutment member so that the multiple sliding plates and multiple locking plates tightly abut against each other.

[0011] Preferably, the horizontal axis is provided with a supporting part, and when the horizontal axis is in the locked position, the locking piece group is clamped between the supporting part and the third abutting member.

[0012] Preferably, the outer support member and the inner support member are provided with limiting shafts; the inner support member is provided with limiting holes, and the limiting shaft passes through the limiting holes.

[0013] Preferably, the outer support member is provided with a fourth through hole, through which the horizontal shaft passes; the unlocking drive structure is provided at the fourth through hole.

[0014] Preferably, the unlocking drive structure has a notch and the horizontal axis has a protrusion; the bottom of the notch forms a drive ramp; when the horizontal axis rotates, the protrusion moves along the drive ramp.

[0015] Preferably, a retaining groove is formed at the bottom of the notch; the retaining groove is located at the end of the drive ramp; when the horizontal shaft rotates, the protrusion moves along the drive ramp and retains in the retaining groove, the horizontal shaft is in the unlocked position.

[0016] This application provides a seat angle adjustment device, including a base and a locking / unlocking structure. The base includes an outer support member and an inner support member, with the outer support member sleeved on the inner support member. A rotating shaft passes through both the outer and inner support members. The inner support member is connected to the seat's support column, and the outer support member is connected to the seat cushion. The locking / unlocking structure includes an operating lever, a locking plate assembly, a locking drive structure, and an unlocking drive structure. The operating lever includes a horizontal shaft, which is axially movable and fixed to the outer support member. The locking plate assembly includes multiple parallel and spaced-apart sliding plates and multiple parallel and spaced-apart sliding plates. The system includes a locking plate, which is fixed to the horizontal axis and staggered with the sliding plate. The sliding plate is fixed to an inner support member and has a travel hole through which the horizontal axis passes. The locking drive structure is an elastic reset structure, allowing the horizontal axis to return to the locked position when no external force is applied. When the horizontal axis is in the locked position, the locking plate and the sliding plate are tightly abutted against each other to lock them in place. The unlocking drive structure includes a driving ramp, which drives the horizontal axis to move axially to the unlocked position when the horizontal axis rotates. When the horizontal axis is in the unlocked position, the locking plate and the sliding plate release each other to slide relative to each other. This design allows for adjustment of the seat cushion to any tilt angle. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of an embodiment of the seat angle adjustment device of this utility model;

[0019] Figure 2 This is another schematic diagram of an embodiment of the seat angle adjustment device of this utility model;

[0020] Figure 3 This is another schematic diagram of an embodiment of the seat angle adjustment device of this utility model;

[0021] Figure 4 for Figure 3 An enlarged view of part A;

[0022] Figure 5 This is another schematic diagram of an embodiment of the seat angle adjustment device of this utility model;

[0023] Figure 6 This is a cross-sectional view of an embodiment of the seat angle adjustment device of this utility model;

[0024] Figure 7 This is an exploded view of an embodiment of the seat angle adjustment device of this utility model;

[0025] Figure 8 This is a schematic diagram of the operating lever of an embodiment of the seat angle adjustment device of this utility model;

[0026] Figure 9 for Figure 8 An enlarged view of part B;

[0027] Figure 10 This is a schematic diagram of the first abutting member of an embodiment of the seat angle adjustment device of this utility model;

[0028] Figure 11 This is a schematic diagram of the first inner support component of an embodiment of the seat angle adjustment device of this utility model.

[0029] Figure 12 This is a schematic diagram of the second inner support component of an embodiment of the seat angle adjustment device of this utility model;

[0030] Figure 13 This is a schematic diagram of a slider in one embodiment of the seat angle adjustment device of this utility model;

[0031] Figure 14 This is a schematic diagram of a locking piece in an embodiment of the seat angle adjustment device of this utility model;

[0032] Figure 15 This is a schematic diagram of the outer support member of an embodiment of the seat angle adjustment device of this utility model;

[0033] Figure 16 This is a schematic diagram of the unlocking drive structure of an embodiment of the seat angle adjustment device of this utility model.

[0034] Explanation of icon numbers:

[0035] 100 base 211a Resistance Department 110 External support components 211b convex part 111 First delivery 220 Locking plate assembly 112 Third delivery 221 slider 113 Fourth through hole 221a travel hole 120 Internal support components 221b Third through hole 121 First inner support component 222 Locking plate 121a First through hole 230 Locked drive structure 122 Second inner support component 240 Unlock driver structure 122a Fixing part 241 Drive slope 122b Second through hole 242 gap 123 Limiting hole 242a Card holder slot 200 Lock-and-unlock structure 300 pivot 210 control lever 400 Fasteners 211 Horizontal axis 500 Limit axis 211c Second receiving piece

[0036] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0037] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0038] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicators will also change accordingly.

[0039] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of indicated technical features. Therefore, features defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. If the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0040] In some chairs, the backrest is fixed to the seat cushion. The tilt angle of the backrest cannot be adjusted, so users cannot lean back significantly when sitting on it.

[0041] In the existing technology, in order to meet the need for reclining, this type of chair adopts the method of adjustable seat cushion tilt angle. However, the existing technology cannot achieve arbitrary tilt angle adjustment of the seat cushion, and cannot meet the needs of various users.

[0042] To address the aforementioned issues, this patent provides a seat angle adjustment device designed to meet the need for arbitrary tilt angle adjustment of the seat cushion.

[0043] For ease of understanding, the specific implementation methods of the embodiments of this application will be described in detail below with reference to the accompanying drawings.

[0044] Please see Figure 1-7 and Figure 13-14A seat angle adjustment device includes a base 100 and a locking / unlocking structure 200. The base 100 includes an outer support member 110 and an inner support member 120, with the outer support member 110 sleeved on the inner support member 120. A rotating shaft 300 passes through the outer support member 110 and the inner support member 120. The inner support member 120 is connected to the support column of the seat, and the outer support member 110 is connected to the seat cushion. The locking / unlocking structure 200 includes an operating lever 210, a locking plate assembly 220, a locking drive structure 230, and an unlocking drive structure 240. The operating lever 210 includes a horizontal shaft 211, which is axially movable and fixed to the outer support member 110. The locking plate assembly 220 includes a plurality of parallel and spaced sliding plates 221 and a plurality of parallel and spaced sliding plates 221. A locking plate 222 is fixedly mounted on the horizontal shaft 211 and interleaved with the sliding plate 221. The sliding plate 221 is fixed to the inner support member 120 and has a travel hole 221a through which the horizontal shaft 211 passes. The locking drive structure 230 is configured as an elastic reset structure so that the horizontal shaft 211 returns to the locked position when no external force is applied. When the horizontal shaft 211 is in the locked position, the locking plate 222 and the sliding plate 221 are tightly abutted against each other to lock each other. The unlocking drive structure 240 includes a driving inclined surface 241 so that when the horizontal shaft 211 rotates, the inclined surface drives the horizontal shaft 211 to move axially to the unlocked position. When the horizontal shaft 211 is in the unlocked position, the locking plate 222 and the sliding plate 221 release each other to slide relative to each other. The aforementioned locking plate 222 being fixedly mounted on the horizontal shaft 211 refers to the locking plate 222 being fixed on the horizontal shaft 211 after the seat angle adjustment device is assembled. The aforementioned locking piece group 220 includes multiple parallel and spaced-apart sliding pieces 221 and multiple parallel and spaced-apart locking pieces 222. The locking pieces 222 and sliding pieces 221 are arranged alternately. The sequence from one end of the locking piece group 220 to the other end can be one locking piece 222, one sliding piece 221, one locking piece 222, one sliding piece 221... or the sequence from one end of the locking piece group 220 to the other end can be one sliding piece 221, one locking piece 222, one sliding piece. 221, one locking piece 222..., or two locking pieces 222, one sliding piece 221, two locking pieces 222, one sliding piece 221..., or two locking pieces 222, two sliding pieces 221, two locking pieces 222, two sliding pieces 221..., the above are just examples and are not limited to the above implementation methods. As long as multiple sliding pieces 221 and locking pieces 222 are arranged side by side and spaced apart, and the locking pieces 222 and sliding pieces 221 are arranged alternately.When the horizontal shaft 211 is in the locked position, the locking plate 222 and the sliding plate 221 are tightly abutted against each other. The static friction between the sliding plate 221 and the locking plate 222 prevents the sliding plate 221 from moving relative to the locking plate 222, thus locking the locking plate 222 and the sliding plate 221 relative to each other. At this time, since the horizontal shaft 211 is fixed to the outer support member 110 and the sliding plate 221 is fixed to the inner support member 120, the horizontal shaft 211 is in the locked position, and the locking plate 222 and the sliding plate 221 are relatively locked. Therefore, the outer support member 110 and the inner support member 120 are relatively fixed. When the horizontal shaft 211 is in the unlocked position, since the locking plate 222 and the sliding plate 221 are not tightly abutted against each other, the sliding plate 221 can move relative to the locking plate 222. At this time, the horizontal shaft 211 can move within the stroke hole 221a, and the outer support member 110 swings accordingly, achieving the effect of adjusting the seat cushion tilt angle. In this way, the need for adjusting the seat cushion at any tilt angle is met.

[0045] It should be noted that the inner support member 120 can be implemented in various ways. This embodiment provides the following implementation method. Please refer to [link / reference]. Figure 7 , Figure 11 and Figure 12 The inner support member 120 includes a first inner support sub-member 121 and a second inner support sub-member 122. The first inner support sub-member 121 has a first through hole 121a, and the second inner support sub-member 122 has a fixing part 122a, which extends through the first inner support sub-member 121 through the first through hole 121a. A slider 221 is fixed to the fixing part 122a. Compared with the method of forming the fixing part 122a on the side wall of the second inner support sub-member 122 while ensuring the same strength, this implementation requires less material and has a simpler processing procedure, thus resulting in lower production costs.

[0046] It should be noted that there are multiple ways to fix the slider 221 to the inner support 120. This embodiment provides the following implementation method. Please refer to [link / reference]. Figure 12 and Figure 13 The inner support member 120 has a fixing portion 122a, which has a second through hole 122b. The slider 221 has a third through hole 221b. The second through hole 122b and the third through hole 221b are non-circular holes. A fixing member 400 adapted to the second through hole 122b and the third through hole 221b passes through the second through hole 122b and the third through hole 221b, so that the slider 221 is fixed to the fixing portion 122a. In this implementation, since the fixing member 400 is adapted to the non-circular holes 122b and the third through hole 221b, the slider 221 will not rotate around the fixing member 400 and can be stably fixed to the fixing portion 122a of the inner support member 120.

[0047] It should be noted that the elastic reset structure can be implemented in various ways. This embodiment provides the following implementation method; please refer to [link / reference]. Figure 2-7 The elastic reset structure is configured as a spring. The outer support member 110 is provided with a first abutment member 111 for one end of the spring to abut against. A threaded hole is formed at the end of the horizontal shaft 211, and a bolt with a second abutment member 211c is threaded onto it. The other end of the spring abuts against the second abutment member 211c. In this implementation, when the horizontal shaft 211 is not subjected to external force, the force generated by the elastic deformation of the spring acts on the second abutment member 211c, causing the horizontal shaft 211 to tend to move axially toward the end with the bolt, thereby resetting to the locked position. Since the spring can undergo a greater degree of elastic deformation, when the horizontal shaft 211 rotates, and the inclined plane 241 causes the horizontal shaft 211 to tend to move axially in the opposite direction, the horizontal shaft 211 can move axially to the unlocked position.

[0048] It should be noted that, based on the implementation method where the locking piece 222 and the sliding piece 221 are tightly abutted against each other to lock each other when the horizontal axis 211 is in the locked position, there is a further question of how to make the locking piece 222 and the sliding piece 221 tightly abut against each other to lock each other. To solve the above problem, this embodiment provides the following implementation method, please refer to [link / reference]. Figure 3-7 and Figure 10 The outer support member 110 is provided with a third abutment member 112. When the horizontal shaft 211 is in the locked position, the locking piece group 220 presses against the third abutment member 112, so that the multiple sliding pieces 221 and the multiple locking pieces 222 tightly abut against each other. In this implementation, the locking piece group 220 presses against the third abutment member 112, so that the locking piece group 220 can be subjected to the pressure of the third abutment member 112, thereby the locking pieces 222 and the sliding pieces 221 tightly abut against each other to lock them together. In this embodiment, the third abutment member 112 can be served by the first abutment member 111, or it can be an additional component.

[0049] It should be noted that, based on the implementation method of the locking piece group 220 pressing against the third abutment member 112, there is a further problem of how to make the locking piece group 220 subject to a force in the opposite direction to the pressure applied by the third abutment member 112. In order to solve the above problem, this embodiment provides the following implementation method, please refer to [link / reference]. Figure 8-9 The horizontal shaft 211 is provided with a supporting portion 211a. When the horizontal shaft 211 is in the locked position, the locking piece assembly 220 is clamped between the supporting portion 211a and the third abutment member 112. In this implementation, when the horizontal shaft 211 is in the locked position, the locking piece assembly 220 is subjected to pressure from the third abutment member 112 and pressure from the supporting portion 211a, which is in the opposite direction to the pressure from the third abutment member 112. Consequently, the locking piece assembly 220 is clamped between the supporting portion 211a and the third abutment member 112.

[0050] It should be noted that, in order to prevent the outer support member 110 from tilting excessively relative to the inner support member 120, this embodiment provides the following implementation method, please refer to [link / reference]. Figure 3 and Figure 11 The outer support member 110 and the inner support member 120 are provided with a limiting shaft 500; the inner support member 120 is provided with a limiting hole 123, and the limiting shaft 500 passes through the limiting hole 123. In this implementation, since the limiting shaft 500 passes through the limiting hole 123, the outer support member 110 can only tilt relative to the inner support member 120 within a preset range.

[0051] It should be noted that there are multiple ways to implement the setting position of the unlocking driver structure 240. This embodiment provides the following implementation method. Please refer to [link / reference]. Figure 15 The outer support member 110 is provided with a fourth through hole 113, and the horizontal shaft 211 passes through the fourth through hole 113; the unlocking drive structure 240 is provided at the fourth through hole 113.

[0052] It should be noted that, based on the implementation method of driving the horizontal axis 211 axially to the unlock position via the driving inclined plane 241, there is a further question regarding how to drive the horizontal axis 211 axially to the unlock position via the driving inclined plane 241. To solve the above problem, this embodiment provides the following implementation method, please refer to [link / reference]. Figure 16 The unlocking drive structure 240 has a notch 242, and the horizontal shaft 211 has a protrusion 211b; the bottom of the notch 242 forms a drive ramp 241; when the horizontal shaft 211 rotates, the protrusion 211b moves along the drive ramp 241. In this implementation, when the protrusion 211b moves from the lower part to the higher part of the drive ramp 241, the horizontal shaft 211 moves axially toward the unlocking position.

[0053] It should be noted that the method of moving the horizontal axis 211 axially to the unlock position based on the movement of the protrusion 211b along the driving inclined surface 241 further raises the question of how to accurately move the horizontal axis 211 to the unlock position. To solve this problem, this embodiment provides the following implementation method, please refer to [link / reference]. Figure 16 A retaining groove 242a is formed at the bottom of the notch 242; the retaining groove 242a is located at the end of the driving inclined surface 241; when the horizontal shaft 211 rotates, the protrusion 211b moves along the driving inclined surface 241 and is engaged in the retaining groove 242a, at which point the horizontal shaft 211 is in the unlocked position. In this implementation, when the protrusion 211b moves along the driving inclined surface 241 and is engaged in the retaining groove 242a, the horizontal shaft 211 can move accurately to the unlocked position. At the same time, since the retaining groove 242a has a retaining function, the protrusion 211b can remain in the retaining groove 242a without external force, and the horizontal shaft 211 can remain in the unlocked position without moving.

[0054] In summary, the seat angle adjustment device provided in this application includes a base 100 and a locking / unlocking structure 200. The base 100 includes an outer support member 110 and an inner support member 120, with the outer support member 110 sleeved on the inner support member 120. A rotating shaft 300 passes through the outer support member 110 and the inner support member 120. The inner support member 120 is connected to the support column of the seat, and the outer support member 110 is connected to the seat cushion. The locking / unlocking structure 200 includes an operating lever 210, a locking plate group 220, a locking drive structure 230, and an unlocking drive structure 240. The operating lever 210 includes a horizontal shaft 211, which is axially movable and fixed to the outer support member 110. The locking plate group 220 includes multiple parallel and spaced sliding plates 221 and multiple parallel sliding plates 221. Locking plates 222 are arranged in a row and spaced apart. The locking plates 222 are fixedly mounted on the horizontal shaft 211 and are staggered with the sliding plates 221. The sliding plates 221 are fixed to the inner support member 120 and have a travel hole 221a through which the horizontal shaft 211 passes. The locking drive structure 230 is configured as an elastic reset structure, so that the horizontal shaft 211 returns to the locked position when no external force is applied. When the horizontal shaft 211 is in the locked position, the locking plates 222 and the sliding plates 221 are tightly abutted against each other to lock them together. The unlocking drive structure 240 includes a driving inclined surface 241, which drives the horizontal shaft 211 axially to the unlocked position when the horizontal shaft 211 rotates. When the horizontal shaft 211 is in the unlocked position, the locking plates 222 and the sliding plates 221 release each other to slide relative to each other. This satisfies the requirement for adjusting the seat cushion to any tilt angle.

[0055] The above description is only a preferred embodiment of the present utility model and does not limit the patent scope of the present utility model. All equivalent structural transformations made under the inventive concept of the present utility model using the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.

Claims

1. A seat angle adjustment device, characterized in that, Includes a base and a locking / unlocking structure; The base includes an outer support member and an inner support member. The outer support member is sleeved on the inner support member, and a pivot is passed through the outer support member and the inner support member. The inner support member is connected to the support column of the seat, and the outer support member is connected to the seat cushion of the seat. The locking and unlocking structure includes an operating lever, a locking plate group, a locking drive structure, and an unlocking drive structure; The operating lever includes a horizontal shaft, which is axially movable and fixed to the outer support member; The locking plate group includes multiple sliding plates arranged in parallel and spaced apart, and multiple locking plates arranged in parallel and spaced apart. The locking plates are fixedly arranged on the horizontal axis and are staggered with the sliding plates. The sliding plates are fixed to the inner support member, and the sliding plates are provided with stroke holes. The horizontal axis passes through the stroke holes. The locking drive structure is configured as an elastic reset structure so that the horizontal axis is reset to the locked position when no external force is applied. When the horizontal axis is in the locked position, the locking piece and the sliding piece abut against each other to lock each other in place; The unlocking drive structure includes a drive ramp, which drives the horizontal axis to move axially to the unlocking position when the horizontal axis rotates. When the horizontal axis is in the unlocked position, the locking piece and the sliding piece release each other to slide relative to each other.

2. The seat angle adjustment device as described in claim 1, characterized in that, The inner support component includes a first inner support sub-component and a second inner support sub-component; The first inner support component has a first through hole, and the second inner support component has a fixing part, which passes through the first through hole and extends out of the first inner support component; the slider is fixed to the fixing part.

3. The seat angle adjustment device as described in claim 1, characterized in that, The inner support member has a fixing part, the fixing part has a second through hole, and the slider has a third through hole. The second through hole and the third through hole are non-circular holes. The second through hole and the third through hole are provided with fixing members adapted to the second through hole and the third through hole, so that the slider is fixed to the fixing part.

4. The seat angle adjustment device as described in claim 1, characterized in that, The elastic reset structure is configured as a spring, and the outer support member is provided with a first abutment member for one end of the spring to abut against. The end of the horizontal shaft has a screw hole and is screwed with a bolt having a second abutment, and the other end of the spring abuts against the second abutment.

5. The seat angle adjustment device as described in claim 4, characterized in that, The outer support member is provided with a third abutment member; When the horizontal axis is in the locked position, the locking plate group presses against the third abutment member so that the plurality of sliding plates and the plurality of locking plates tightly abut against each other.

6. The seat angle adjustment device as described in claim 5, characterized in that, The horizontal axis is provided with a supporting part. When the horizontal axis is in the locked position, the locking piece group is clamped between the supporting part and the third abutting member.

7. The seat angle adjustment device as described in claim 1, characterized in that, The outer support member and the inner support member are provided with limiting shafts; The inner support member is provided with a limiting hole, and the limiting shaft passes through the limiting hole.

8. The seat angle adjustment device as described in claim 1, characterized in that, The outer support member is provided with a fourth through hole, and the horizontal shaft passes through the fourth through hole; The unlocking drive structure is located at the fourth through hole.

9. The seat angle adjustment device as described in claim 1, characterized in that, The unlocking drive structure has a notch, and the horizontal axis has a protrusion; The bottom of the notch forms the driving ramp; when the horizontal axis rotates, the protrusion moves along the driving ramp.

10. The seat angle adjustment device as described in claim 9, characterized in that, A retaining groove is formed at the bottom of the notch; The retaining groove is located at the end of the driving inclined surface; When the horizontal axis rotates, and the protrusion moves along the driving inclined surface and engages with the holding groove, the horizontal axis is in the unlocked position.

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