CN220157902U - Chair seat tilting angle adjusting mechanism and chair - Google Patents

Abstract

The utility model discloses a chair seat tilting angle adjusting mechanism and a chair, comprising a first connecting seat, wherein the front part of the first connecting seat is provided with a gear adjusting groove which is formed by a plurality of communicated gear holes; the front part of the second connecting seat is provided with a first connecting hole; the adjusting rod is fixedly provided with a guide piece, and is provided with a concave part; the guide seat is provided with a second connecting hole; an elastic member; the first connecting seat is hinged with the second connecting seat, the guide seat is fixedly arranged at the front part in the second connecting seat, the adjusting rod is arranged in the gear adjusting groove, the first connecting hole and the second connecting hole in a penetrating mode, the guide piece and the guide seat are mutually matched, so that the guide piece can move to drive the adjusting rod to axially move when the adjusting rod is rotated, the adjusting rod moves between two adjacent gear holes through the concave part, and the elastic piece is sleeved on the adjusting rod and resets the adjusting rod. In this scheme, the user can be according to the inclination of self needs regulation chair seat support on the chair, uses the travelling comfort higher.

Description

Chair seat tilting angle adjusting mechanism and chair

Technical Field

The utility model relates to the field of seats, in particular to a chair seat inclination angle adjusting mechanism and a chair.

Background

The chair is a necessary household article for people in daily life and work, and plays a role in bearing the weight of the people. Along with the improvement of the living standard of people, the requirements on the comfort of chairs are also higher, and the chair backs of many existing chairs can rotate to different angles back and forth relative to a chassis so as to improve the comfort in use.

The patent application with the publication number of CN206354749U discloses a connecting mechanism of a seat chassis and a seat back, which comprises a rotating connecting structure of the chassis and the seat back, a spring plate and a blocking block, wherein the spring plate and the blocking block are arranged on the chassis, the front end of the spring plate is fixed at the front part of the chassis, the rear end of the spring plate extends towards the rear part of the chassis, and the rotating connecting structure is arranged at the rear side of the rear end of the spring plate; the blocking block is arranged above the elastic sheet and is tightly pressed on the elastic sheet; the chair back is provided with an upper pressing piece extending forwards at the rotary connecting structure, and the upper pressing piece acts on the lower side of the rear end of the elastic piece. The connecting mechanism has good reliability, long service life, simple structure and low manufacturing cost, and the chair mainly depends on the rotating connecting structure between the tray for fixing the chair seat and the chair back fixing frame for fixing the chair back and the locking mechanism to realize the functions of lying down the chair back and adjusting the inclination angle of the chair back. However, the chair with the chassis has a complex structure, can only realize functions of adjusting the tilting angle of the backrest, adjusting the elasticity of the backrest and the like, has single function, and has an unadjustable seat, so that a user cannot change the tilting angle of the seat according to the needs of the user when using the chair, and the comfort of the chair is low.

Disclosure of Invention

In order to solve the technical problems, the utility model aims to provide a chair seat inclination angle adjusting mechanism and a chair, wherein a user can adjust the inclination angle of the chair seat on the chair according to the needs of the user, and the use comfort is higher.

In order to achieve the above purpose, the present utility model adopts the following technical scheme:

a seat recline angle adjustment mechanism comprising:

the gear adjusting groove is formed in the front of the first connecting seat and consists of a plurality of communicated gear holes, and the width of a channel between two adjacent gear holes is smaller than the diameter of each gear hole;

the front part of the second connecting seat is provided with a first connecting hole;

the adjusting rod is fixedly provided with a guide piece, and is provided with a concave part;

the guide seat is provided with a second connecting hole;

an elastic member;

the guide seat is fixedly arranged at the front part in the second connecting seat, the adjusting rod penetrates through the gear adjusting groove, the first connecting hole and the second connecting hole to be connected with the first connecting seat, the second connecting seat and the guide seat, the guide piece of the adjusting rod is matched with the guide seat, so that the guide piece can move to drive the adjusting rod to axially move when the adjusting rod is rotated, a channel between two adjacent gear holes only can accommodate the concave part of the adjusting rod to pass through, the adjusting rod moves between two adjacent gear holes through the concave part, and therefore the inclination angle of the first connecting seat is adjusted, the elastic piece is sleeved on the adjusting rod and is used for resetting the adjusting rod, after the inclination angle of the first connecting seat is determined, the adjusting rod is loosened, the adjusting rod is reset under the action of the elastic piece, and the first connecting seat and the second connecting seat are locked.

Preferably, one side of the guide seat is provided with at least one arc-shaped guide surface, and the guide piece moves along the arc-shaped guide surface of the guide seat so as to drive the adjusting rod to axially move; and limiting parts for limiting the movement of the guide piece are respectively arranged at two ends of the arc-shaped guide surface. This allows limiting the travel of the guide and thus limiting the distance of axial movement of the adjustment rod.

Preferably, the first connecting seat is used for being fixedly connected with the seat, the second connecting seat is used for being fixedly connected with the chair leg connecting mechanism, the first connecting seat comprises a first connecting plate and two first side plates respectively arranged at the left side and the right side of the first connecting plate, the gear adjusting groove is formed in the first side plates, and the seat is fixedly arranged on the upper part of the first connecting plate; the second connecting seat comprises a second connecting plate and two second side plates respectively arranged at the left side and the right side of the second connecting plate, the first connecting hole is formed in the second side plates, the guide seat is fixedly arranged at the front part of the second connecting plate, and the chair leg connecting mechanism is fixedly arranged at the lower part of the second connecting plate. The chair leg connecting mechanism can be a tray with an unadjustable inclination angle or a tray with other adjustable inclination angles and elasticity.

Preferably, a gap exists between the first side plate and the second side plate.

Preferably, the adjusting rod is further provided with two limiting pieces, and the two limiting pieces are respectively positioned at the left side and the right side of the guide piece; when the first side plate is positioned in the second side plate, the two limiting pieces are positioned between the two first side plates, and when the first side plate is positioned outside the second side plate, the two limiting pieces are positioned between the two second side plates; the elastic piece is positioned between one limiting piece and the guide seat.

Preferably, the concave part of the adjusting rod is positioned in the gear adjusting groove, and when the first side plate is positioned outside the second side plate, one of the limiting pieces is propped against the second side plate; when the first side plate is positioned in the second side plate, one of the limiting pieces is propped against the first side plate.

Preferably, at least one side edge of the concave portion is a guiding slope. The guide inclined plane plays a guiding role in the moving process of the adjusting rod, so that the adjusting rod is prevented from being clamped in the axial moving process. The left and right sides of first connecting seat all is equipped with gear adjustment groove, and the left and right sides of adjusting the pole all is equipped with concave portion, the position of concave portion and the position looks adaptation of corresponding side gear adjustment groove.

Preferably, one end of the adjusting rod is a handle. Thus, a user can conveniently hold the force when rotating the adjusting rod.

Preferably, the elastic piece is a spring, and the first connecting seat and the second connecting seat are hinged through a connecting rod.

A chair comprising a seat tilt angle adjustment mechanism as described above.

The utility model has the following beneficial effects due to the adoption of the technical scheme: according to the utility model, the guide piece of the adjusting rod is matched with the guide seat, so that the guide piece can move when the adjusting rod is rotated to drive the adjusting rod to axially move, the rotating adjusting mode is not easy to forcefully overuse, and the service life of the adjusting rod is prolonged. Therefore, a user can adjust the inclination angle of the chair seat on the chair according to the needs of the user, and the use comfort is higher.

Drawings

FIG. 1 is a schematic diagram of the structure of the present utility model;

FIG. 2 is a schematic view of the structure of FIG. 1 at another angle (with the leg attachment mechanism removed);

FIG. 3 is a schematic view of the structure of the first connecting seat;

FIG. 4 is a schematic view of the structure of the second connecting base;

FIG. 5 is a schematic view of the mechanism of the adjustment lever;

fig. 6 is a schematic structural view of the guide holder.

Reference numerals:

1. a first connection base; 11. a first connection plate; 12. a first side plate; 121. a gear adjusting groove; 1211. a gear hole;

2. a second connecting seat; 21. a second connecting plate; 22. a second side plate; 221. a first connection hole;

3. an adjusting rod; 31. a guide member; 32. a concave portion; 321. a guide slope; 33. a limiting piece; 34. a handle;

4. a guide seat; 41. a second connection hole; 42. an arc-shaped guide surface; 43. a limit part;

5. an elastic member;

6. a gap;

7. a chair leg connecting mechanism;

8. and (5) connecting a rod.

Detailed Description

Embodiments of the present utility model are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative and intended to explain the present utility model and should not be construed as limiting the utility model.

In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "clockwise", "counterclockwise", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present utility model, unless otherwise specified, the meaning of "a plurality" is two or more, unless otherwise clearly defined.

In the present utility model, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

In the present utility model, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, as well as the first and second features not being in direct contact but being in contact with each other through additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.

For convenience of description, in the present utility model, the sitting direction of the user is the back, the opposite is the front, the sitting position is the upper, the opposite is the lower, the left hand of the user is the left, the opposite is the right, and the position close to the center of the first connecting seat is the inner, the opposite is the outer.

Example 1

As shown in fig. 1 to 6, a seat reclining angle adjustment mechanism includes:

a first connecting seat 1, wherein a gear adjusting groove 121 is formed in the front part of the first connecting seat 1, the gear adjusting groove 121 is formed by a plurality of communicated gear holes 1211, and the width of a channel between two adjacent gear holes 1211 is smaller than the diameter of the gear hole 1211;

the second connecting seat 2, the front part of the second connecting seat 2 is provided with a first connecting hole 221;

the adjusting rod 3, a guide 31 is fixedly arranged on the adjusting rod 3, and a concave portion 32 is arranged on the adjusting rod 3. In one embodiment, the concave portion 32 may be an annular groove or other shaped groove provided on the adjustment lever, and in other embodiments, the concave portion 32 may be flat;

the guide seat 4 is provided with a second connecting hole 41;

an elastic member 5; preferably, the elastic member 5 is a spring.

The first connecting seat 1 and the second connecting seat 2 are hinged, the guide seat 4 is fixedly arranged at the front part in the second connecting seat 2, the adjusting rod 3 is arranged in the gear adjusting groove 121, the first connecting hole 221 and the second connecting hole 41 in a penetrating mode, so that the first connecting seat 1, the second connecting seat 2 and the guide seat 4 are connected, the guide piece 31 of the adjusting rod 3 and the guide seat 4 are matched with each other, when the adjusting rod 3 is rotated, the guide piece 31 can be moved, the adjusting rod 3 is driven to axially move, the channel between two adjacent gear holes 1211 can only accommodate the concave part 32 of the adjusting rod 3 to pass through, the adjusting rod 3 moves between the two adjacent gear holes 1211 through the concave part 32, therefore, the inclination angle of the first connecting seat 1 is adjusted, the elastic piece 5 is sleeved on the adjusting rod 3 and is used for resetting the adjusting rod 3, after the inclination angle of the first connecting seat 1 is determined, the adjusting rod 3 is loosened, the adjusting rod 3 is reset under the action of the elastic piece 5, and the first connecting seat 1 and the second connecting seat 2 are locked.

In the present utility model, the diameter of the adjustment rod 3 is larger than the channel width between the adjacent two gear holes 1211, and the diameter of the adjustment rod 3 is smaller than the diameters of the gear holes 1211, the first coupling hole 221 and the second coupling hole 41.

At least one side of the concave portion 32 is a guiding slope 321. In one embodiment, the left and right sides of the first connecting seat 1 are provided with gear adjusting grooves 121, the left and right sides of the adjusting rod 3 are provided with concave parts 32, and the positions of the concave parts 32 are matched with the positions of the corresponding side gear adjusting grooves 121; in another embodiment, the first connecting seat 1 is provided with a gear adjusting slot 121 on one side and an arc slot on the other side, so that only the concave portion 32 is required to be provided on one side of the adjusting rod 3 close to the gear adjusting slot 121, and the position of the concave portion 32 is adapted to the position of the corresponding side gear adjusting slot 121.

The first connecting seat 1 is fixedly connected with a seat, the second connecting seat 2 is fixedly connected with a seat foot connecting mechanism 7, the seat foot connecting mechanism 7 can be a fixed tray or an adjustable tray, as shown in fig. 3 and 4, the first connecting seat 1 comprises a first connecting plate 11 and two first side plates 12 respectively arranged at the left side and the right side of the first connecting plate 11, the gear adjusting groove 121 is formed in the first side plates 12, and the seat is fixedly arranged at the upper part of the first connecting plate 11; the second connecting seat 2 comprises a second connecting plate 21 and two second side plates 22 respectively arranged at the left side and the right side of the second connecting plate 21, the first connecting hole 221 is formed in the second side plates 22, the guide seat 4 is fixedly arranged at the front part of the second connecting plate 21, and the chair leg connecting mechanism 7 is fixedly arranged at the lower part of the second connecting plate 21.

As shown in fig. 5, the adjusting rod 3 is further provided with two limiting members 33, and the two limiting members 33 are respectively located at the left and right sides of the guiding member 31. One end of the adjusting rod 3 is a handle 34 which is convenient for a user to hold.

As shown in fig. 6, in the present utility model, at least one arc-shaped guiding surface 42 is provided on one side of the guiding seat 4, and the guiding element 31 moves along the arc-shaped guiding surface 42 of the guiding seat 4 so as to drive the adjusting rod 3 to axially move; both ends of the arc-shaped guide surface 42 are respectively provided with a limiting part 43 for limiting the movement of the guide member 31. The number of the arc-shaped guide surfaces 42 in the guide seat 4 can be determined according to the number of the guide members 31, and the travel of the arc-shaped guide surfaces 42 can be determined according to the number of the guide members 31 and the angle of rotation actually required.

The first connecting seat 1 and the second connecting seat 2 are hinged through a connecting rod 8. The hinge positions between the first connecting seat 1 and the second connecting seat 2 may be the middle part of the first connecting seat 1 and the middle part of the second connecting seat 2, or may be the rear part of the first connecting seat 1 and the rear part of the second connecting seat 2.

In this embodiment, as shown in fig. 1 and 2, the first side plate 12 is located at the outer side of the second side plate 22, a gap 6 exists between the first side plate 12 and the second side plate 22, the arc-shaped guiding surface 42 is disposed towards the handle 34, two limiting pieces 33 are located between the two second side plates 22, when the first connecting seat 1 and the second connecting seat 2 are locked, the concave portion 32 of the adjusting rod 3 near the handle 34 is located between the first side plate 12 and the second side plate 22, the limiting piece 33 far from the handle 34 abuts against the second side plate 22 on the corresponding side, and the elastic piece 5 is located between the limiting piece 33 far from the handle 34 and the guiding seat 4; the concave part 32 of the adjusting rod 3 is located in the gear adjusting groove 121 by rotating the adjusting rod 3 outwards, the first connecting seat 1 and the second connecting seat 2 are unlocked, the first connecting seat 1 is rotated to adjust the gear, the limiting piece 33 close to the handle 34 abuts against the second side plate 22 on the corresponding side at the moment, the elastic piece 5 is compressed, after the inclination angle of the first connecting seat 1 is determined, the adjusting rod 3 is loosened, the adjusting rod 3 is reset under the action of the elastic piece 5, and the first connecting seat 1 and the second connecting seat 2 are locked.

Example 2

The difference between this embodiment and embodiment 1 is that, when the first connecting seat 1 and the second connecting seat 2 are locked, the concave portion 32 of the adjusting lever 3 near the handle 34 is located at the outer side of the first side plate 12 at the corresponding side, the limiting member 33 near the handle 34 abuts against the second side plate 22 at the corresponding side, and the elastic member 5 is located between the limiting member 33 near the handle 34 and the guide seat 4; the concave part 32 of the adjusting rod 3 is positioned in the gear adjusting groove 121 by rotating the adjusting rod 3 inwards, the first connecting seat 1 and the second connecting seat 2 are unlocked, the first connecting seat 1 is rotated to adjust the gear, the limiting piece 33 far away from the handle 34 is propped against the second side plate 22 on the corresponding side at the moment, the elastic piece 5 is compressed, after the inclination angle of the first connecting seat 1 is determined, the adjusting rod 3 is loosened, the adjusting rod 3 is reset under the action of the elastic piece 5, and the first connecting seat 1 and the second connecting seat 2 are locked.

Example 3

The difference between this embodiment and embodiment 1 is that the first side plate 12 is located at the inner side of the second side plate 22, two limiting members 33 are located between the two first side plates 12, when the first connecting seat 1 and the second connecting seat 2 are locked, the concave portion 32 of the adjusting lever 3 near the handle 34 is located at the inner side of the corresponding side plate 12, the limiting member 33 far from the handle 34 abuts against the corresponding side plate 12, and the elastic member 5 is located between the limiting member 33 far from the handle 34 and the guide seat 4; the concave part 32 of the adjusting rod 3 is located in the gear adjusting groove 121 by rotating the adjusting rod 3 outwards, the first connecting seat 1 and the second connecting seat 2 are unlocked, the first connecting seat 1 is rotated to adjust the gear, the limiting piece 33 close to the handle 34 abuts against the first side plate 12 on the corresponding side at the moment, the elastic piece 5 is compressed, after the inclination angle of the first connecting seat 1 is determined, the adjusting rod 3 is loosened, the adjusting rod 3 is reset under the action of the elastic piece 5, and the first connecting seat 1 and the second connecting seat 2 are locked.

Example 4

The difference between this embodiment and embodiment 3 is that, when the first connecting seat 1 and the second connecting seat 2 are locked, the concave portion 32 of the adjusting lever 3 near the handle 34 is located between the first side plate 12 and the second side plate 22, the limiting member 33 near the handle 34 abuts against the first side plate 12 on the corresponding side, and the elastic member 5 is located between the limiting member 33 near the handle 34 and the guide seat 4; the concave part 32 of the adjusting rod 3 is positioned in the gear adjusting groove 121 by rotating the adjusting rod 3 inwards, the first connecting seat 1 and the second connecting seat 2 are unlocked, the first connecting seat 1 is rotated to adjust the gear, the limiting piece 33 far away from the handle 34 is propped against the first side plate 12 on the corresponding side at the moment, the elastic piece 5 is compressed, after the inclination angle of the first connecting seat 1 is determined, the adjusting rod 3 is loosened, the adjusting rod 3 is reset under the action of the elastic piece 5, and the first connecting seat 1 and the second connecting seat 2 are locked.

Example 5

The utility model also provides a chair comprising the chair seat tilting angle adjusting mechanism.

All features described in the description, the appended claims and the drawings, either alone or in any combination, are important features of the present utility model.

In the description of the present specification, the descriptions of the terms "one embodiment," "some embodiments," "one implementation," "a particular implementation," "other implementations," "examples," "particular examples," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment, implementation, or example of the present utility model. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described above may be combined in any suitable manner in any one or more embodiments, implementations, or examples. The technical scheme disclosed by the utility model also comprises the technical scheme that any one or more specific features, structures, materials or characteristics are formed singly or in combination.

Although embodiments of the present utility model have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the utility model, and that variations, modifications, alternatives, variations, deletions of parts, additions of features, or re-combination of features may be made to the above embodiments by those skilled in the art without departing from the spirit and principles of the utility model, all such simple modifications, equivalents, and adaptations of the embodiments as may be made by the principles of the utility model and without departing from the scope of the utility model.

Claims (10)

1. A seat recline angle adjustment mechanism, comprising:

the gear adjusting device comprises a first connecting seat (1), wherein a gear adjusting groove (121) is formed in the front of the first connecting seat (1), the gear adjusting groove (121) is formed by a plurality of communicated gear holes (1211), and the width of a channel between two adjacent gear holes (1211) is smaller than the diameter of each gear hole (1211);

the second connecting seat (2), the front part of the second connecting seat (2) is provided with a first connecting hole (221);

the adjusting rod (3), the guide piece (31) is fixedly arranged on the adjusting rod (3), and the concave part (32) is arranged on the adjusting rod (3);

the guide seat (4), the said guide seat (4) is opened with a second connecting hole (41);

an elastic member (5);

the novel gear adjusting device is characterized in that the first connecting seat (1) and the second connecting seat (2) are hinged, the guide seat (4) is fixedly arranged at the front part in the second connecting seat (2), the adjusting rod (3) is arranged in the gear adjusting groove (121), the first connecting hole (221) and the second connecting hole (41) in a penetrating mode, the first connecting seat (1), the second connecting seat (2) and the guide seat (4) are connected, the guide piece (31) of the adjusting rod (3) and the guide seat (4) are matched with each other, so that the guide piece (31) can be moved when the adjusting rod (3) is rotated to drive the adjusting rod (3) to axially move, a channel between two adjacent gear holes (1211) can only accommodate the concave part (32) of the adjusting rod (3) to pass through, the adjusting rod (3) moves between two adjacent gear holes (1211) through the concave part (32), and the elastic piece (5) is sleeved on the adjusting rod (3) and is used for resetting the adjusting rod (3).

2. A seat reclining angle adjustment mechanism according to claim 1, wherein one side of the guide seat (4) is provided with at least one arc-shaped guide surface (42), and the guide piece (31) moves along the arc-shaped guide surface (42) of the guide seat (4) to drive the adjustment rod (3) to axially move; limiting parts (43) for limiting the movement of the guide piece (31) are respectively arranged at two ends of the arc-shaped guide surface (42).

3. The chair seat tilting angle adjusting mechanism according to claim 1, wherein the first connecting seat (1) is fixedly connected with the chair seat, the second connecting seat (2) is fixedly connected with the chair leg connecting mechanism (7), the first connecting seat (1) comprises a first connecting plate (11) and two first side plates (12) respectively arranged at the left side and the right side of the first connecting plate (11), the gear adjusting groove (121) is formed in the first side plates (12), and the chair seat is fixedly arranged at the upper part of the first connecting plate (11); the second connecting seat (2) comprises a second connecting plate (21) and two second side plates (22) which are respectively arranged on the left side and the right side of the second connecting plate (21), the first connecting holes (221) are formed in the second side plates (22), the guide seat (4) is fixedly arranged at the front part of the second connecting plate (21), and the chair leg connecting mechanism (7) is fixedly arranged at the lower part of the second connecting plate (21).

4. A seat recline angle adjustment mechanism according to claim 3 wherein a gap (6) exists between the first side plate (12) and the second side plate (22).

5. A seat reclining angle adjustment mechanism according to claim 3, wherein the adjustment lever (3) is further provided with two limiting members (33), and the two limiting members (33) are respectively located at the left and right sides of the guide member (31); when the first side plate (12) is positioned in the second side plate (22), the two limiting pieces (33) are positioned between the two first side plates (12), and when the first side plate (12) is positioned outside the second side plate (22), the two limiting pieces (33) are positioned between the two second side plates (22); the elastic piece (5) is positioned between a limiting piece (33) and the guide seat (4).

6. A seat reclining angle adjustment mechanism according to claim 5, wherein the concave portion (32) of the adjustment lever (3) is located in the gear adjustment groove (121), and one of the stoppers (33) abuts against the second side plate (22) when the first side plate (12) is located outside the second side plate (22); when the first side plate (12) is positioned in the second side plate (22), one of the limiting pieces (33) is propped against the first side plate (12).

7. A seat reclining angle adjustment mechanism according to claim 1, wherein at least one side of said concave portion (32) is a guide slope (321); the left and right sides of first connecting seat (1) all are equipped with gear adjustment groove (121), and the left and right sides of regulation pole (3) all are equipped with concave portion (32), the position of concave portion (32) and the position looks adaptation of corresponding side gear adjustment groove (121).

8. A seat reclining angle adjustment mechanism according to claim 1, wherein one end of the adjustment lever (3) is a handle (34).

9. The chair seat tilting angle adjusting mechanism according to claim 1, wherein the elastic member (5) is a spring, and the first connecting seat (1) and the second connecting seat (2) are hinged by a connecting rod (8).

10. A chair comprising a seat recline angle adjustment mechanism according to any one of claims 1 to 9.