CN116268846A - Large-angle tilting linkage structure of seat - Google Patents

Abstract

The invention discloses a large-angle tilting linkage structure of a seat, which comprises the following components: the chassis is provided with a seat in a sliding manner; the back support is fixedly connected with the chassis; the middle part of the chair back is rotationally arranged on the back support, the bottom of the chair back is rotationally arranged on the chair seat to drive the chair seat to horizontally slide along one side facing or deviating from the back support, a soft rubber part is arranged between the chair back and the back support, the soft rubber part is positioned on a rotation path of the chair back, one end of the soft rubber part is abutted against the chair back, and the other end of the soft rubber part is abutted against the back support. The chair back is rotatably arranged on the chair seat, the rotation rigidity of the chair seat is small, the chair back can be driven to rotate backwards when a user leans backwards, and soft rubber parts are arranged on the rotation path of the chair back and are respectively abutted with the chair back and the back support, so that the backward rotation of the chair back can be buffered, the user leans backwards to use more comfortably, the chair back is driven to slide forwards when rotating backwards, a larger angle is generated on the basis of the chassis, the range of the leaning backwards of the user is larger, and the user leans backwards to sit more comfortably.

Description

Large-angle tilting linkage structure of seat

Technical Field

The invention relates to the technical field of chairs, in particular to a large-angle tilting linkage structure of a chair.

Background

In the related art, a chair back for a seated user to recline and support is arranged on the chair seat, in some related technologies, the chair back is arranged on the chair seat, the seated user leans backwards by means of self weight to drive the chair back to incline backwards, and the force required by the seated user to drive the chair back to incline backwards is large because the rigidity of the backward rotation of the chair back is large, so that the problem of poor comfort level of use exists. In some related technologies, a user needs to operate the chassis to enable the chair back to tilt backwards, so that operation and adjustment are complicated, in addition, the angle of the chair back relative to the chassis is small, the angle of the chair back tilting angle is small, and sitting comfort of the user is poor.

Disclosure of Invention

The present invention aims to solve at least one of the technical problems existing in the prior art. Therefore, the invention provides the large-angle tilting linkage structure of the seat, which enables the chair back to tilt backwards through the back of the chair back of the sitting posture of a human body, and enables the soft rubber piece to deform and the chair seat to slide forwards through the supporting point, so that a larger angle on the basis of the chassis is generated, and the sitting of a user is more comfortable.

According to an embodiment of the invention, a large-angle tilting linkage structure of a seat comprises:

the chassis is provided with a seat in a sliding manner;

the back support is fixedly connected with the chassis;

the chair comprises a chair back, wherein the middle part of the chair back is rotatably arranged on the back support, the bottom of the chair back is rotatably arranged on the chair seat, the chair seat is driven to horizontally slide along one side facing or departing from the back support, a soft rubber piece is arranged between the chair back and the back support and is positioned on a rotating path of the chair back, one end of the soft rubber piece is abutted to the chair back, and the other end of the soft rubber piece is abutted to the back support.

The large-angle tilting linkage structure of the seat provided by the embodiment of the invention has at least the following beneficial effects: the chair back is rotatably arranged on the chair seat, the rotation rigidity of the chair seat is small, the chair back can be driven to rotate backwards when a user leans backwards, and soft rubber parts are arranged on the rotation path of the chair back and are respectively abutted with the chair back and the back support, so that the backward rotation of the chair back can be buffered, the user leans backwards to use more comfortably, the chair back is driven to slide forwards when rotating backwards, a larger angle is generated on the basis of the chassis, the range of the leaning backwards of the user is larger, and the user leans backwards to sit more comfortably.

According to the large-angle tilting linkage structure of the seat, the chassis is provided with the compression spring, one end of the compression spring is connected with the chassis, and the other end of the compression spring is connected with the seat so as to drive the seat to move along one side facing the back support.

According to the large-angle tilting linkage structure of the seat, the seat is provided with the extension plate, two ends of the extension plate respectively extend into the seat and the chair back, two ends of the extension plate are respectively provided with the first rotating shaft and the second rotating shaft, the first rotating shaft is rotatably arranged on the seat, and the second rotating shaft is rotatably arranged on the chair back.

According to the large-angle tilting linkage structure of the seat, the seat is provided with the first hinging seat matched with the first rotating shaft, the bottom of the seat back is provided with the mounting groove and the rotating groove which are mutually communicated, part of the extending plate extends into the mounting groove, and the second rotating shaft is rotatably arranged in the rotating groove.

According to the large-angle tilting linkage structure of the seat, the first connecting plate is arranged between the seat and the chassis, the seat is slidably arranged on the first connecting plate, and two ends of the first connecting plate are hinged with the chassis and form a plane connecting rod mechanism with the chassis.

According to the large-angle tilting linkage structure of the seat, a second connecting plate is further arranged between the seat and the first connecting plate, one of the second connecting plate and the first connecting plate is provided with a strip-shaped limit groove, the other one of the second connecting plate and the first connecting plate is provided with a limit column, and the limit column is arranged in the limit groove in a sliding mode.

According to the large-angle tilting linkage structure of the seat, the connecting seat is arranged on one side, facing the seat base, of the seat back, the second hinging seat is arranged on the top of the back support, and the connecting seat is connected with the second hinging seat through the rotating shaft.

According to the large-angle tilting linkage structure of the seat, the connecting seat and the seat back are further provided with two buffer columns, the two buffer columns are arranged at intervals along the direction parallel to the central line of the rotating shaft, and two ends of the buffer columns are respectively abutted with the connecting seat and the seat back.

According to the large-angle tilting linkage structure of the chair, the chair back comprises the first back frame and the second back frame, the first back frame is located above the second back frame, the bottom of the first back frame is connected with the back support, a lumbar support is arranged on one side, facing the center of the chair seat, of the second back frame, and the lumbar support is installed on the second back frame in an adjustable mode along the vertical direction.

According to the large-angle tilting linkage structure of the seat, the first arc-shaped plate and the second arc-shaped plate are sequentially arranged on one side, facing the center of the seat, of the second back frame, the first arc-shaped plate is provided with the strip-shaped groove extending along the vertical direction, the waist rest is connected with the adjusting block, the adjusting block is arranged in the strip-shaped groove in a sliding mode and is matched with the first arc-shaped plate in a stepping clamping mode, and the second arc-shaped plate penetrates through the waist rest and is used for guiding vertical movement of the waist rest.

Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.

Drawings

The foregoing and/or additional aspects and advantages of the invention will become apparent and may be better understood from the following description of embodiments taken in conjunction with the accompanying drawings in which:

FIG. 1 is a schematic view of a chair with a large-angle reclining linkage structure applied to a chair according to an embodiment of the present invention;

FIG. 2 is a first exploded view of a seatback linkage of a high angle recliner linkage of some embodiments of the present invention;

FIG. 3 is a second exploded view of a seatback linkage of a high angle recliner linkage of some embodiments of the present invention;

FIG. 4 is a first exploded view of a second back frame connection of a high angle recliner linkage of some embodiments of the present invention;

FIG. 5 is a schematic view of a seat portion of a high angle recliner linkage of some embodiments of the present invention;

FIG. 6 is an exploded view of a seat attachment structure for a high angle recliner linkage of some embodiments of the present invention;

fig. 7 is a second exploded view of a second back frame connection structure of a high angle recliner linkage of a seat according to some embodiments of the invention.

Reference numerals illustrate:

a back support 100; a second socket 101; a soft rubber member 110; a deformation groove 1101; a first plug-in portion 111; a second plug-in portion 112; a connection base 120; a second hinge base 130; a rotation shaft 131;

a seat 200; a first hinge base 210;

a seatback 300; a first back frame 310; a first insertion groove 3101; a buffer column 311; a second back frame 320; a mounting groove 3201; rotating groove 3202; a first arcuate plate 321; a bar-shaped groove 3211; a clamping groove 3212; a second arcuate plate 322; a lumbar support 323; an adjustment block 330;

a fixing plate 410; an extension plate 420; a first rotation shaft 421; a second rotation shaft 422;

a chassis 500; a first connection plate 510; a first limit groove 511; a second connection plate 520; a second limiting groove 521; compression spring 530; a first stopper column 540; a second limit post 550; a first round bar 560; a second round bar 570.

Detailed Description

Embodiments of the present invention 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 only and are not to be construed as limiting the invention.

In the description of the present invention, it should be understood that references to orientation descriptions such as upper, lower, front, rear, left, right, etc. are based on the orientation or positional relationship shown in the drawings, are merely for convenience of description of the present invention and to simplify the description, and do not indicate or imply that the apparatus or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the present invention.

In the description of the present invention, a number means one or more, a number means two or more, and greater than, less than, exceeding, etc. are understood to not include the present number, and above, below, within, etc. are understood to include the present number. The description of the first and second is for the purpose of distinguishing between technical features only and should not be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.

In the description of the present invention, unless explicitly defined otherwise, terms such as arrangement, installation, connection, etc. should be construed broadly and the specific meaning of the terms in the present invention can be reasonably determined by a person skilled in the art in combination with the specific contents of the technical scheme.

In the description of the present invention, the descriptions of the terms "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific 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 or example of the present invention. 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 may be combined in any suitable manner in any one or more embodiments or examples.

In the related art, a chair back for a seated user to recline and support is arranged on the chair seat, in some related technologies, the chair back is arranged on the chair seat, the seated user leans backwards by means of self weight to drive the chair back to incline backwards, and the force required by the seated user to drive the chair back to incline backwards is large because the rigidity of the backward rotation of the chair back is large, so that the problem of poor comfort level of use exists. In some related technologies, a user needs to operate the chassis to enable the chair back to tilt backwards, so that operation and adjustment are complicated, in addition, the angle of the chair back relative to the chassis is small, the angle of the chair back tilting angle is small, and sitting comfort of the user is poor.

For this reason, as shown in fig. 1 to 3, 5 and 6, the large-angle tilting linkage structure of the seat provided by the present invention comprises a chassis 500, a back support 100, a chair back 300 and a seat 200, wherein the seat 200 is slidably disposed on the chassis 500, the back support 100 is fixedly connected with the chassis 500, the middle part of the chair back 300 is rotatably mounted on the back support 100, and the bottom of the chair back 300 is rotatably mounted on the seat 200, so as to drive the seat 200 to horizontally slide along one side facing to or facing away from the back support 100. Further, a soft rubber member 110 is disposed between the backrest 300 and the back support 100, the soft rubber member 110 is located on the rotation path of the backrest 300, one end of the soft rubber member 110 is abutted with the backrest 300, and the other end is abutted with the back support 100. It should be noted that, the chair back 300 is rotatably mounted on the chair seat 200, the rotation rigidity of the chair seat 200 is smaller, the chair back 300 can be driven to rotate backwards when the user leans back, and the soft rubber member 110 is arranged on the rotation path of the chair back 300, and the soft rubber member 110 is respectively abutted with the chair back 300 and the back support 100, so that the backward rotation of the chair back 300 can be buffered, the user leans back more comfortably, the chair seat 200 is driven to slide forwards when the chair back 300 rotates backwards, and a larger angle is generated on the base plate 500, so that the user leans back more comfortably. In some embodiments, the seat 200 is connected to a fixing plate 410 and an extension plate 420, the seat 200 is fixedly connected to the back support 100 through the fixing plate 410, and the seat 200 is rotatably connected to the backrest 300 through the extension plate 420. Specifically, one end of the fixing plate 410 is fixed to the seat 200, and the other end is fixed to the back bracket 100; the extension plate 420 is provided at both ends thereof with a first rotation shaft 421 and a second rotation shaft 422, respectively, the first rotation shaft 421 is rotatably connected with the seat 200, and the second rotation shaft 422 is rotatably connected with the seatback 300. In some embodiments, the seat 200 is provided with a first hinge base 210 that cooperates with a first rotation shaft 421, and referring to fig. 7, a mounting groove 3201 and a rotation groove 3202 that are mutually communicated are provided at the bottom of the seat back 300, a portion of the extension plate 420 extends into the mounting groove 3201, and the second rotation shaft 422 is rotatably disposed in the rotation groove 3202. It should be noted that, by providing the extension plate 420, the backrest 300 can be connected at a greater distance behind the seat 200, and the first rotation shaft 421, the second rotation shaft 422 and the extension plate 420 are integrally provided, and the linkage between the backrest 300 and the seat 200 is achieved by the rotation connection between the first rotation shaft 421 and the seat 200, the connection between the second rotation shaft 422 and the backrest 300, and the extension plate 420 extending into the backrest 300.

In some embodiments of the present invention, as shown in fig. 2 and 3, the chair back 300 includes a first back frame 310 and a second back frame 320, the first back frame 310 is located above the second back frame 320, the bottom of the first back frame 310 is connected to the back support 100, the second back frame 320 is mounted on the first back frame 310, for example, a bump is provided at the top of the second back frame 320, a groove corresponding to the bump is provided at the bottom of the first back frame 310, and the bump is in plug-fit with the groove. The bottom of the second back frame 320 is rotatably connected to the second rotation shaft 422 of the extension plate 420. It is easy to understand that the chair back 300 is divided into an upper frame body and a lower frame body, so that the size of a packing box required for splitting and packing products is effectively reduced, and the transportation cost is reduced. In some embodiments, the middle portion of the chair back 300, i.e. the connection between the first back frame 310 and the second back frame 320, is rotatably connected to the back support 100, for example, the connection between the first back frame 310 and the back support 100 is rotatably connected to further increase the rotation angle of the chair back 300, and if the head of the user leans backward, the first back frame 310 can also rotate backward by a small margin, so as to further improve the sitting comfort of the user. In some embodiments of the present invention, a hidden axis is designed between the first back frame 310 and the back support 100, so that the overall appearance is better, specifically, a connecting seat 120 is installed on a side of the first back frame 310 facing the seat 200, the connecting seat 120 is located at the bottom of the first back frame 310, a second hinge seat 130 is disposed at the top of the back support 100, and the connecting seat 120 is connected to the second hinge seat 130 through a rotation axis 131. In addition, the rotating shaft 131 is disposed inside the connecting seat 120 and is not easy to be perceived.

In some embodiments of the present invention, as shown in fig. 2 and 3, two ends of the flexible glue member 110 are respectively in plug-in connection with the first back frame 310 and the back support 100, so that the installation is more stable. In addition, the flexible glue member 110 is located at one side of the connecting seat 120 away from the seat 200, when the first back frame 310 rotates backwards, the flexible glue member 110 deforms, so that the rotation of the first back frame 310 can be buffered, and the comfort level of the user is further improved. Specifically, a first plugging portion 111 is disposed at one end of the flexible glue component 110, a second plugging portion 112 is disposed at the other end, a first plugging groove 3101 matching the shape of the first plugging portion 111 is formed in the first back frame 310, and a second plugging groove 101 matching the shape of the second plugging portion 112 is formed in the back support 100. The two ends of the soft rubber piece 110 are inserted and installed, so that the installation is more stable. Further, the side of the flexible glue member 110 facing away from the seat 200 is provided with a deformation groove 1101, which is beneficial to pressing the flexible glue member 110 to deform the flexible glue member 110 when the first back frame 310 rotates backwards. Alternatively, the soft rubber member 110 is a rubber member, which has good elasticity and durability.

In some embodiments of the present invention, as shown in fig. 2 and 3, a buffer post 311 is disposed between the connection seat 120 and the first back frame 310, and two ends of the buffer post 311 respectively abut against the connection seat 120 and the chair back 300. In addition to the arrangement of the soft plastic member 110 for buffering the rotation between the first back frame 310 and the back bracket 100, the buffer post 311 provides a buffer for the connection between the first back frame 310 and the connection base 120. For example, the flexible glue member 110 is vertically arranged, and the buffer post 311 is horizontally arranged, so that the movement of the first back frame 310 can be better buffered, the rotation of the first back frame 310 is smoother, and the use of the seat is more comfortable. Further, two buffer columns 311 are provided, and the two buffer columns 311 are arranged at intervals along the direction parallel to the central line of the rotating shaft 131, so that the chair back 300 has a tilting function. In some embodiments, two buffer columns 311 are used as supporting points, when a human body leans on the chair back 300, the first back frame 310 can rotate left and right by a certain angle through the self weight of the human body, so that the user can use the chair more comfortably.

As shown in fig. 3 and 4, in some embodiments of the present invention, a lumbar support 323 is provided on a side of the second back frame 320 facing the center of the seat 200, and can support the lumbar of the seated user to prevent the seated user from sitting with lumbago. In addition, the lumbar support 323 is mounted on the second back frame 320 in a vertical direction, and can be adjusted according to the needs of the sitting person, thereby improving the applicability of the lumbar support 323. In some embodiments, a first arc plate 321 and a second arc plate 322 are sequentially installed on one side of the second back frame 320 towards the center of the seat 200, the first arc plate 321 is provided with a bar-shaped groove 3211 extending along the vertical direction, the lumbar support 323 is connected with an adjusting block 330, the adjusting block 330 is slidably arranged in the bar-shaped groove 3211 and is in step-by-step clamping fit with the first arc plate 321, and the second arc plate 322 is arranged on the lumbar support 323 in a penetrating manner and is used for guiding the vertical movement of the lumbar support 323. Specifically, the part of the adjusting block 330 is inserted into the lumbar support 323 through a bar-shaped groove 3211 and fixed with the lumbar support 323, a plurality of clamping grooves 3212 are formed in the side wall of the bar-shaped groove 3211 at equal intervals along the vertical direction, and the adjusting block 330 is clamped with the clamping grooves 3212 so as to adjust the height of the lumbar support 323 at equal intervals along the vertical direction. It should be noted that, the first curved plate 321 is in a streamline design, and conforms to the lumbar curve of the human body, and the strip-shaped groove 3211 extends along the arc of the first curved plate 321. In addition, the second arc plate 322 can serve as a function similar to that of the reinforcing rib except for guiding the lumbar support 323, the rigidity of connection between the lumbar support 323 and the first arc plate 321 is enhanced, the lumbar support 323 is transferred through the second arc plate 322, the design is more flexible, the shape of the lumbar curve of a human body can be more conformed, and the lumbar support is more comfortable. Further, the lumbar support 323 and the second arc plate 322 are provided with a plurality of strip-shaped heat dissipation grooves corresponding to the strip-shaped grooves 3211 of the first arc plate 321, so that the overall appearance of the product is better.

In some embodiments of the present invention, as shown in fig. 5 and 6, the chassis 500 is provided with a compression spring 530, one end of the compression spring 530 is connected to the chassis 500, and the other end is connected to the seat 200, so as to drive the seat 200 to move along a side toward the back support 100, thus, the seat 200 is in a natural state, the seat 200 is retracted inwards to return, does not protrude outwards to occupy a place, and is adapted to allow the seat 200 to slide forwards and elongate in response to a sitting person sitting backwards.

In some embodiments of the present invention, as shown in fig. 6, a first link plate 510 and a second link plate 520 are provided between the seat 200 and the chassis 500, and one end of a compression spring 530 is connected to one side of the first link plate 510 toward the seatback 300, and the other end is connected to a screw (not shown) fixed to the second link plate 520 to drive the second link plate 520 to move toward one side of the seatback 300. Specifically, the first connection plate 510 is connected to the chassis 500, the second connection plate 520 is fixedly connected to the seat 200, and the first connection plate 510 and the second connection plate 520 are slidably engaged in a horizontal direction, so that the seat 200 can move toward or away from one side of the backrest 300. Further, one of the second connecting plate 520 and the first connecting plate 510 is provided with a bar-shaped limit groove, and the other is provided with a limit post, and the limit post is slidably arranged in the limit groove, so that the second connecting plate 520 can be slidably guided and prevented from sliding out. For example, a first limiting groove 511 is formed in an end surface of the first connecting plate 510, a first limiting post 540 corresponding to the first limiting groove 511 is mounted on the second connecting plate 520, and the first limiting post 540 is slidably disposed in the first limiting groove 511. For another example, a second limiting groove 521 is formed on an end surface of the second connecting plate 520, the second limiting post 550 corresponding to the second limiting groove 521 is mounted on the first connecting plate 510, and the second limiting post 550 is slidably disposed in the second limiting groove 521.

In a further embodiment of the present invention, as shown in fig. 6, both ends of the first connecting plate 510 are hinged to the chassis 500 and form a planar link mechanism with the chassis 500, and referring to the movement characteristics of the links, when the user drives the first connecting plate 510 to slide, the first connecting plate 510 can tilt relative to the horizontal plane and form a certain angle when sliding, so that the flexibility of the movement of the seat 200 is higher, and the user sits more comfortably. For example, when the seat is tilted at a large angle, the seat 200 can also be tilted at a large angle to the horizontal, better supporting the seated user, and improving the comfort of the seated user. In some embodiments, the first connecting plate 510 is rotatably provided with a first round bar 560 and a second round bar 570 at two ends, the chassis 500 is rotatably provided with a first rotating plate and a second rotating plate at two ends, the first rotating plate is hinged to the first round bar 560 at one end facing away from the chassis 500, and the second rotating plate is hinged to the second round bar 570 at one end facing away from the chassis 500. At this time, referring to the connection mechanism, the first rotating plate and the second rotating plate may be used as a crank, the first connecting plate 510 is a connecting rod, in some embodiments, a distance between two rotation axes in the first rotating plate is equal to a distance between two rotation axes in the second rotating plate, at this time, the chassis 500, the first rotating plate, the second rotating plate and the first connecting plate 510 together form a parallelogram mechanism, at this time, the first connecting plate 510 performs a translational motion with respect to a horizontal plane. In some embodiments, the distance between the two rotation axes in the first rotation plate is not equal to the distance between the two rotation axes in the second rotation plate, and the first connection plate 510 can rotate relative to the horizontal plane.

The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge of one of ordinary skill in the art without departing from the spirit of the present invention.

Claims (10)

1. The large-angle tilting linkage structure of the seat is characterized by comprising:

the chassis is provided with a seat in a sliding manner;

the back support is fixedly connected with the chassis;

the chair comprises a chair back, wherein the middle part of the chair back is rotatably arranged on the back support, the bottom of the chair back is rotatably arranged on the chair seat, the chair seat is driven to horizontally slide along one side facing or departing from the back support, a soft rubber piece is arranged between the chair back and the back support and is positioned on a rotating path of the chair back, one end of the soft rubber piece is abutted to the chair back, and the other end of the soft rubber piece is abutted to the back support.

2. The seat reclining link structure according to claim 1, wherein: the chassis is provided with a compression spring, one end of the compression spring is connected with the chassis, and the other end of the compression spring is connected with the seat so as to drive the seat to move along one side facing the back support.

3. The seat reclining link structure according to claim 1, wherein: the extension board is installed to the seat support, extend the both ends of board and stretch into respectively the seat support with the back of the chair, the both ends of extension board are provided with first axis of rotation and second axis of rotation respectively, first axis of rotation rotate set up in the seat support, the second axis of rotation rotate set up in the back of the chair.

4. A seat reclining link assembly as set forth in claim 3 wherein: the chair seat is provided with first pivot complex first articulated seat, the bottom of back of the chair is provided with mounting groove and the rotation groove of intercommunication each other, and part the extension board stretches into the mounting groove, the second axis of rotation rotate set up in the rotation groove.

5. The seat reclining link structure according to claim 1, wherein: the chair comprises a chair seat and a chassis, wherein a first connecting plate is arranged between the chair seat and the chassis, the chair seat is slidably arranged on the first connecting plate, and two ends of the first connecting plate are hinged with the chassis and form a plane connecting rod mechanism with the chassis.

6. The seat reclining link assembly of claim 5, wherein: the chair comprises a chair seat and a first connecting plate, wherein a second connecting plate is further arranged between the chair seat and the first connecting plate, one of the second connecting plate and the first connecting plate is provided with a strip-shaped limit groove, the other one of the second connecting plate and the first connecting plate is provided with a limit column, and the limit column is arranged in the limit groove in a sliding mode.

7. The seat reclining link structure according to claim 1, wherein: the chair back is installed towards one side of the chair seat, the top of the back support is provided with a second hinging seat, and the connecting seat is connected with the second hinging seat through a rotating shaft.

8. The seat reclining link assembly of claim 7, wherein: the connecting seat with the back of the chair still is provided with two buffer columns, two the buffer column is along being parallel to the central line direction interval arrangement of pivot, the both ends of buffer column respectively with the connecting seat with the back of the chair butt.

9. The seat reclining mechanism according to claim 1 or 3 or 4 or 7 or 8, wherein: the chair back comprises a first back frame and a second back frame, wherein the first back frame is located above the second back frame, the bottom of the first back frame is connected with the back support, one side, facing the center of the chair seat, of the second back frame is provided with a lumbar support, and the lumbar support is mounted on the second back frame in an adjustable mode along the vertical direction.

10. The seat reclining link assembly of claim 9, wherein: the second back frame towards one side at the seat support center is installed first arc and second arc in proper order, first arc is provided with the bar groove that extends along vertical direction, the waist is leaned on and is connected with the regulating block, the regulating block slide set up in the bar groove and with the step-by-step joint cooperation of first arc, the second arc wear to locate the waist leans on and is used for right the vertical motion direction that the waist leans on.

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