TWM637585U - Seat-back linkage device for chairs - Google Patents

Abstract

This invention relates to a seat back linkage device of a chair, which mainly connects a seat body and a seat chassis pivotally, and a cushion group vertical plate is arranged above the seat body and the seat chassis, and uses The seat cushion upright is pivotally connected to the seat main body, whereby when the user sits on the seat cushion on the seat cushion upright, the seat cushion upright is pivotally connected to the seat main body as the fulcrum , when the front side of the seat cushion group vertical plate moves downward, the seat cushion elastic piece connected to the rear side of the seat cushion group vertical plate can be used to slowly lower the front side of the seat cushion group vertical plate to the required forward angle, and when the user lies on the chair When the seat back is assembled on the rear side of the seat main body, the pivot joint between the seat main body and the seat chassis is used as the fulcrum to make the rear side of the seat main body move backward, and the pivot joint between the seat main body and the seat cushion assembly vertical plate is formed. The top brace is used to prop up the seat cushion assembly vertical plate, so that the seat back can be tilted synchronously with the seat seat, and the riding comfort effect can be improved.

Description

Seat-back linkage device for chairs

The invention relates to the technical field of chairs, especially a seat-back linkage device of chairs.

Press, general office chairs and other chairs are usually designed with a reclining adjustment function on the back of the chair. When the user sits on the chair and lies on the back of the chair, the back of the chair can elastically swing to achieve an elastic cushioning effect. However, due to this general Office chairs and other chairs have no linkage between the seat back and the seat seat. Therefore, the seat seat cannot be properly adjusted and changed as the user leans on the seat back, which affects the riding comfort.

Therefore, some people in the industry have developed a chair that can make the seat and the back of the chair move. Please refer to Taiwan Announcement No. M599751 "Seat Pan and Seat Back Linkage Mechanism" and Chinese Announcement No. CN215271602U "A Kind of Back and Back Tilting Mechanism" "Chair" and other patents, when the user sits on the chair and lies on the back of the chair, causing the back of the chair to change in tilt, the system can be linked with the seat to produce a tilting action synchronously, thereby obtaining more For a comfortable sitting posture, however, the linkage mechanism of the seat and the back of the existing chair is too complicated in structural design, with many parts, relatively high manufacturing cost, and takes up a lot of space, which affects the overall aesthetics of the chair.

The reason is that, considering that the existing chairs that can make the seat and the back of the chair have the above-mentioned deficiencies in the manufacture and implementation, the creator has made use of his many years of manufacturing and design experience and knowledge in related fields, and through many parties. Ingenious research and creation of this creation.

This creation is about a seat-back linkage device of a chair. Its main purpose is to provide a chair with a simple structure, low manufacturing cost, and a flat design that can make the back of the chair move synchronously with the seat. Seat back linkage device.

In order to achieve the above implementation goals, the creator has developed the seat-back linkage device for the following chairs, including:

A seat main body is provided with a chassis assembly part at the front side of the seat body, and a seat back assembly part is provided at the rear side of the seat body, and the seat body is arranged between the chassis assembly part and the seat back A shrapnel assembly vertical groove is provided between the assembly parts, and the rear side groove wall of the spring sheet assembly vertical groove is set up adjacent to the chair back assembly part;

A seat chassis, the seat chassis is arranged at the chassis assembly part of the seat body, and at least one first pivot is passed through and pivotally connected with the chassis assembly part, and the front side of the seat chassis is connected to The rear ends of a support elastic piece are assembled together, and the front end of the support elastic piece extends to the front of the seat chassis, and at least one seat back elastic piece is arranged in the elastic piece assembly groove of the seat main body, and the seat back elastic piece The front end is combined with the rear side of the seat chassis, and a buckle part is provided on the back side groove wall of the vertical groove of the spring plate opposite to the spring plate of the seat back, so that the rear end of the seat back spring is connected with the rear groove of the vertical groove of the spring plate The buckle part on the wall corresponds to the buckle positioning;

A cushion assembly vertical plate is to make the seat cushion assembly vertical plate be located above the seat main body and the seat chassis, and to pass through the seat main body with at least one second pivot, and to make the seat cushion The pivot joint between the seat main body and the seat main body is located in front of the pivot joint between the seat main body and the seat chassis, and the front end of the support spring of the seat chassis is in contact with the front side of the seat cushion vertical plate.

The above-mentioned seat back linkage device for chairs, wherein, at least one cushion spring and a tip rod are further arranged in the spring assembly groove of the seat main body, so that the front end of the seat cushion spring is assembled on the seat At the rear side of the chassis, a through hole is provided at the rear end of the seat cushion shrapnel, and the tip rod is passed through the through hole of the seat cushion shrapnel, and a stopper is provided at the bottom end of the tip rod to To be in contact with the bottom surface of the seat cushion shrapnel, and the upper end of the tip rod is assembled at the rear side of the seat cushion group vertical plate, and a connecting plate is provided between the front side of the seat cushion group vertical plate and the front end of the supporting spring piece of the seat chassis , and the upper and lower ends of the connecting plate are pivotally connected to the seat cushion assembly vertical plate and the supporting elastic piece respectively.

The above-mentioned seat-back linkage device for chairs, wherein, the connecting plate is inclined from the upper rear to the lower front, so that an angle is formed between the connecting plate and the upright plate of the seat cushion assembly.

The seat-back linkage device of the chair as mentioned above, wherein, the angle between the connecting plate and the seat cushion assembly vertical plate is 6 degrees.

In the above-mentioned seat-back linkage device of a chair, a groove is provided on the bottom surface of the front side of the upright plate of the seat cushion assembly, so that the connecting plate can be correspondingly accommodated in the groove.

The seat-back interlocking device of the above-mentioned chair, wherein, the support elastic piece is thrown upward gradually from the rear end to the front end in a curved arc shape.

The above-mentioned seat back linkage device for chairs, wherein, the seat cushion assembly upright plate is formed with a pivot ear on the left and right sides of the bottom surface, and the seat main body is opposite to the left and right sides. Each position is provided with a pivot portion, so as to pass through and pivotally connect with the pivot ears on the two sides of the seat cushion assembly vertical plate through a second pivot respectively.

The above-mentioned seat back linkage device of the chair, wherein, the seat main system is provided with a sound-absorbing sheet at the bottom of the vertical groove of the elastic sheet assembly, which is located below the seat back elastic sheet.

The seat back linkage device of the chair mentioned above, wherein, the seat back linkage device of the chair further includes a seat back control unit, and the seat back control unit includes a tenon, so that the tenon is arranged on the The vertical groove of the shrapnel group of the seat body, and at least one groove is provided in the middle of the rear side groove wall of the vertical groove of the shrapnel group, so as to be engaged with the tenon correspondingly. There is a first control board, and the first control board is connected with the tenon.

The seat back interlocking device of the chair mentioned above, wherein, the seat back interlocking device of the chair further includes a lift control unit, and the lift control unit includes a second control board, and the second control board is assembled with A driving handle is included on one side of the seat cushion group vertical plate, and the driving handle is connected with the second control board, and a hollow part is formed in the seat chassis, and the driving handle is arranged on the In the hollow part of the seat chassis, and pivotally connected with the seat chassis, a lifting rod is set in the middle of the bottom of the seat chassis, and an actuating button is arranged on the upper end of the lifting rod, and the upper end of the lifting rod Located in the hollow part of the seat chassis, the front end of the driving handle is brought into contact with the action button on the upper end of the elevating rod.

Thereby, when the user sits on the seat cushion set on the seat cushion group vertical plate, the seat cushion group vertical plate is pivoted to the seat main body as a fulcrum, and when the front side of the seat cushion group vertical plate moves downward, the seat The seat cushion shrapnel connected to the rear side of the cushion group vertical board can make the front side of the seat cushion group vertical board slowly drop to the required forward angle. The pivot joint between the main body and the seat chassis is the fulcrum, so that the rear side of the seat main body moves backward, and the pivot joint between the seat main body and the seat cushion group vertical plate forms a top support to support the seat cushion group vertical plate to achieve The back of the seat is linked with the seat and the seat is tilted synchronously to improve the effect of riding comfort.

In order to make a more complete and clear disclosure of the technical means of this creation and the effects it can achieve, the detailed description is as follows. Please also refer to the disclosed drawings and drawing numbers:

First of all, as shown in the first picture, the seat-back linkage device of the chair created in this work mainly includes:

A seat main body (1) is provided with a chassis assembly (11) at the front side of the seat main body, and a seat back assembly (13) is provided at the rear side of the seat main body (1). The seat main body (1) is provided with a shrapnel assembly vertical groove (12) between the chassis assembly upright portion (11) and the chair back assembly upright portion (13), and the rear side groove wall of the shrapnel assembly vertical groove (12) is aligned with the chair The back assembly (13) is adjacently set up, and a chair back (6) is arranged on the chair back assembly (13);

A seat chassis (2), please refer to the second and third figures together, so that the seat chassis (2) is arranged at the chassis assembly (11) of the seat main body (1), and is connected with the seat chassis (1). At least one first pivot (21) is pivotally connected between the chassis assembly parts (11), and the front side of the seat chassis (2) is assembled with the rear end of a support elastic piece (22), and the support elastic piece (22) The front end extends to the front of the seat chassis (2), and the supporting shrapnel (22) is gradually thrown upwards from the rear end to the front end in a curved arc shape, and in addition to the seat main body (1) At least one cushion shell (23), at least one chair back shell (24) and a tip rod (25) are arranged in the vertical groove (12) of the shell group, and the main embodiment of the present invention makes the seat cushion shell (23) be provided with several pieces, and make the several seat cushion shrapnels (23) be stacked and set up, and make the seat back shrapnel (24) be provided with several pieces, and make the several seat back shrapnels (24) be stacked and set up, and make the seat cushion The front ends of the shrapnel (23) and the back shrapnel (24) are combined with the rear side of the seat chassis (2), and a through hole (231) is provided at the rear end of the cushion shrapnel (23) in addition, and the The tip rod (25) is passed through the through hole (231) of the seat cushion shrapnel (23), and a stop portion (251) is provided at the bottom end of the tip rod (25) for connecting with the seat cushion shrapnel (23). ) bottom surface is in contact with each other, and a buckle part (121) is provided at the rear side groove wall of the spring assembly vertical groove (12) relative to the seat back spring (24), so that the rear end of the seat back spring (24) is in contact with the spring The buckle part (121) provided on the rear side groove wall of the assembly vertical groove (12) corresponds to the locking position, and the groove bottom of the spring assembly vertical groove (12) is located below the seat cushion spring (23) and the seat back spring (24) A sound-absorbing sheet (26) is provided at the seat to reduce the abnormal sound generated when the seat cushion spring (23) and the seat back spring (24) are actuated, and the seat chassis (2) is assembled with a lifting rod in the middle of its bottom (7), the elevating rod (7) can be an air pressure rod, and the action button (71) on the upper end of the elevating rod (7) is located in the hollow part (27) of the seat chassis (2);

A cushion group vertical plate (3), which is to make the seat cushion group vertical plate (3) be located above the seat main body (1) and the seat chassis (2), and to be assembled on the upper end surface of the seat cushion group vertical plate (3). A cushion (31) is provided, and a pivot ear (32) is respectively formed on the left and right sides of the bottom surface of the seat cushion group vertical plate (3), and the seat main body (1) is placed on the left and right sides of the seat cushion. A pivot portion (14) is respectively provided at the opposite position of the side, so as to be pivotally connected with the two side pivot ears (32) of the seat cushion assembly vertical plate (3) with a second pivot shaft (33) respectively, and make the seat The pivot joint between the cushion group vertical plate (3) and the seat main body (1) is located in front of the pivot joint between the seat main body (1) and the seat chassis (2), and is passed through the seat main body (1) ) and the first pivot (21) at the pivotal joint of the seat chassis (2) is higher than the second pivot at the pivotal joint between the seat cushion assembly vertical plate (3) and the seat main body (1) (33), and the seat cushion group vertical plate (3) is provided with a lock hole (36) at its rear side, so as to correspond to the upper end of the tip rod (25) of the seat chassis (2). Locking, please also refer to the fourth figure, in addition, a connecting plate (34) is provided between the front side of the seat cushion group vertical plate (3) and the front end of the support spring (22) of the seat chassis (2), And make its upper and lower two ends of the connecting plate (34) pivotally connected with the seat cushion group vertical plate (3) and the support elastic piece (22) respectively, and make the connecting plate (34) incline from the upper rear to the lower front, An angle (θ) of about 6 degrees is formed between the connecting plate (34) and the seat cushion group vertical plate (3), and the seat cushion group vertical plate (3) is provided with a hole for the connection at its front bottom surface. The plate (34) corresponds to the groove (35) contained in it;

A chair back control unit (4), please also refer to the fifth figure, it includes a tenon (41), so that the tenon (41) is arranged on the vertical groove of the shrapnel (1) of the seat main body (1) 12), and make the shrapnel group vertical groove (12) be provided with at least one card groove (122) at its rear side groove wall, the main embodiment of the present invention is tied to the shrapnel group vertical groove (12) rear side groove wall Several card slots (122) are arranged at intervals from top to bottom, so that the tenon (41) is correspondingly locked with a card slot (122) according to the adjustment requirements, and the rear side groove wall of the vertical groove (12) of the shrapnel assembly and A first elastic member (42) is arranged between the tenon (41), and the first elastic member (42) is a tension spring. In addition, the seat cushion group vertical plate (3) is placed between the left and right sides of the bottom. One side is provided with a first control board (43), and a locking part (44) is provided between the first control board (43) and the seat cushion group vertical board (3), so that the first control board ( 43) Connect with the tenon (41) with a first stay rope (45);

A lifting control unit (5) includes a second control board (51), and the second control board (51) is arranged on the bottom of the seat cushion vertical board (3) opposite to the first control board (43) and connect the second control board (51) with the seat cushion group vertical board (3) with a second elastic member (52), the second elastic member (52) is a stretch The spring also includes a driving handle (53), so that the driving handle (53) is arranged in the hollow part (27) of the seat chassis (2), and is pivotally connected with the seat chassis (2), and Make the front end of the driving handle (53) contact with the action button (71) of the elevating rod (7), and make the second control panel (51) and the rear end of the driving handle (53) connect with a second pull cord ( 54) Connect.

According to this, when using and implementing, the user is made to sit on the seat cushion (31) of the chair of the present creation, and after bearing the weight of the user's ride, the seat cushion assembly riser (3) will be aligned with the chair The pivot point of the second pivot (33) provided by the seat body (1) is a fulcrum, so that the front side of the seat cushion group vertical plate (3) is displaced downward, and at the same time, the rear side of the seat cushion group vertical plate (3) is relatively Move up, and pull up the seat cushion shrapnel (23) connected with the tip rod (25) through the tip rod (25) assembled on the rear side of the seat cushion group vertical plate (3), use The elastic cushioning of the seat cushion shrapnel (23) is such that the front side of the seat cushion assembly vertical plate (3) can be slowly lowered to abut against the front end of the supporting shrapnel (22). Please also refer to the sixth figure, and Make this connecting plate (34) accommodate in the groove (35) of this seat cushion group upright plate (3), at this moment, this seat cushion group upright plate (3) front side is the inclination angle setting of 6 degrees of forward inclination, in order to User ride comfort.

Furthermore, please also refer to the seventh figure, when the user leans against the chair back (6), the seat back assembly (13) set on the rear side of the seat main body (1) causes a backward push. When functioning, utilize the elastic cushioning of the chair back shrapnel (24) that is adjacent to the chair back assembly (13) to make the chair back (6) produce a kind of elastic swing effect, and when the user's body center of gravity gradually moves backward When moving, the seat main body (1) will use the pivot point of the first pivot (21) set on the seat chassis (2) as a fulcrum, so that the seat back (6) is linked to the set. The rear side of the seat main body (1) is displaced backward and downward. At this time, the seat main body (1) and the seat cushion group vertical plate (3) located in front of the pivot joint between the seat main body (1) and the seat chassis (2) ) with the second pivot (33) will be relatively upward displacement, so that the seat cushion vertical plate (3) Up propping, here, can lean on the power of the chair back (6) by the user himself, to carry the weight of the user's body sitting on the seat cushion (31) of the seat, and the user The body is pushed up synchronously to achieve the self-loading effect, and the linkage effect between the chair back (6) and the seat seat is used to improve the comfort of the user when riding the chair.

When the user leaves the chair back (6) and leans against it, the chair back shrapnel (24) deformed due to the user leaning against the chair back (6) will return to its original state and drive the seat back (6) to The chair back assembly (13) on the rear side of the seat main body (1) rear side resets together. Please also refer to the eighth figure, and then the user can manually pull the first control panel (43) of the seat back control unit (4) to pull the connected card through the first pull cord (45) The tenon (41) is actuated so that the tenon (41) is correspondingly locked in the seat main body (1) and positioned in the groove (122) provided on the rear side groove wall of the spring assembly vertical groove (12) of the seat body (1), and then is aligned with the seat body (1). The seat back assembly (13) adjacent to the back side groove wall of the shrapnel assembly vertical groove (12) produces a braking effect so that the chair back (6) is fixed, so that the linkage between the chair back (6) and the seat seat can be released Effect, at this time, the locking part (44) set between the first control panel (43) and the seat cushion group vertical plate (3) can fix the locking state of the tenon (41) and the groove (122), and After the lock of the locking part (44) is released, the tenon (41) will be pulled back by the connected first elastic member (42), so as to break away from the engagement with the groove (122).

When the user leaves the seat, the user sits on the seat cushion (31) of the seat cushion group vertical plate (3), and the deformed seat cushion shrapnel (23) will return to its original state to pull the connected tip Rod (25) moves downwards, and at this moment, this tip rod (25) can pull the rear side of the seat cushion group vertical plate (3) that is assembled together to move down, and with this seat cushion group vertical plate (3) and The pivot joint of the seat body (1) is a fulcrum, and the front side of the seat cushion group vertical plate (3) will be relatively displaced upward, so that the seat cushion group vertical plate (3) returns to a flat state.

In addition, when the user wants to adjust the seat lift, he can pull the second control plate (51) of the lift control unit (5), so that the second control plate (51) is pulled by the second pull cord (54) The drive handle (53) is activated, please refer to the ninth figure, and the front end of the drive handle (53) presses the control button (71) of the air pressure rod (7) to drive the air pressure rod (7) to drive The assembled seat chassis (2) moves up and down together with the seat parts such as the seat main body (1). When the user releases the pull of the second control panel (51), the elastic recovery effect of the second elastic member (52) provided between the second control panel (51) and the seat cushion assembly vertical panel (3) is used to drive The front end of the driving handle (53) breaks away from the pressing of the control button (71) of the air bar (7), so as to fix the adjusted height of the seat.

The aforementioned embodiments or drawings do not limit the implementation of this creation, and this creation can omit the setting of the connecting plate (34) between the seat cushion assembly upright (3) and the seat chassis (2) and its support springs (22) , so that the front end of the support spring (22) of the seat chassis (2) is directly in contact with the bottom surface of the front side of the seat cushion assembly riser (3), any appropriate changes or modifications made by those with ordinary knowledge in the technical field, All should be regarded as not departing from the patent scope of this creation.

As can be seen from the above structure and implementation, the creation system has the following advantages:

1. The seat-back interlocking device of this creation has a simple structural design and low manufacturing cost, and effectively utilizes the internal space of the seat to facilitate the flattening of the seat-back interlocking device, which is very aesthetic in appearance design. According to this , in order to enhance consumers' willingness to purchase and enhance the industrial competitiveness of the creation.

2. The seat back linkage device of the chair of this creation is to simultaneously support the body of the user sitting on the seat when the user is lying on the back of the chair. Strength, to bear the weight of the user's body on the seat, to achieve the effect of self-loading.

3. The seat back linkage device of the chair in this creation is provided with a connecting plate between the seat cushion vertical plate and the supporting spring, and an angle of about 6 degrees is formed between the connecting plate and the seat cushion vertical plate. When the user sits on the seat cushion, the seat cushion can be tilted forward by 6 degrees to improve riding comfort.

To sum up, the embodiment of this creation can indeed achieve the expected effect, and the specific structure disclosed by it has not only never been seen in similar products, nor has it been disclosed before the application. It has fully complied with the provisions of the Patent Law and It is really convenient to file an application for a new type patent in accordance with the law, to ask for the review and to grant the patent.

1: Seat body

11: Chassis assembly department

12: shrapnel group vertical groove

121: buckle part

122: card groove

13: Chair back assembly department

14: Pivot

2: Seat chassis

21: First Pivot

22: Support shrapnel

23: Seat shrapnel

231: through hole

24: Seat back shrapnel

25: tip rod

251: stop part

26: Noise reduction sheet

27: Hollow part

3: seat cushion upright

31: seat cushion

32: hub ear

33: Second Pivot

34: connecting plate

35: Groove

36: Keyhole

4: Seat back control unit

41: tenon

42: The first elastic piece

43: The first control panel

44: Locking parts

45: First drawstring

5: Lifting control unit

51: Second control panel

52: Second elastic member

53:Drive handle

54: Second drawstring

6: Chair back

7: Lifting rod

71: Action button

The first picture: the three-dimensional picture of this creation

Figure 2: A sectional view of this creation

The third picture: the second cutaway view of this creation

Figure 4: Partially enlarged sectional view of this creation

Figure 5: Partial enlarged section view of the second part of this creation

Figure 6: Partially enlarged sectional view of the sitting state of the seat of this creation

Figure 7: Sectional view of the back of the chair in this creation

Figure 8: Partially enlarged sectional view of the chair back locking state of this creation

Figure 9: Partially enlarged sectional view of the driving state of the lifting rod in this creation

1: Seat body

11: Chassis assembly department

13: Chair back assembly department

2: Seat chassis

22: Support shrapnel

3: seat cushion upright

31: seat cushion

32: hub ear

34: connecting plate

4: Seat back control unit

43: The first control panel

44: Locking parts

5: Lifting control unit

51: Second control panel

52: Second elastic member

6: Chair back

7: Lifting rod

Claims (10)

A seat-back linkage device for a chair, comprising: A seat main body is provided with a chassis assembly part at the front side of the seat body, and a seat back assembly part is provided at the back side of the seat body, and the seat body is arranged between the chassis assembly part and the seat back A shrapnel assembly vertical groove is provided between the assembly parts, and the rear side groove wall of the spring sheet assembly vertical groove is set up adjacent to the chair back assembly part; A seat chassis, the seat chassis is arranged at the chassis assembly part of the seat body, and at least one first pivot is passed through and pivotally connected with the chassis assembly part, and the front side of the seat chassis is connected to The rear ends of a support elastic piece are assembled together, and the front end of the support elastic piece extends to the front of the seat chassis, and at least one seat back elastic piece is arranged in the elastic piece assembly groove of the seat main body, and the seat back elastic piece The front end is combined with the rear side of the seat chassis, and a buckle part is provided on the back side groove wall of the vertical groove of the spring plate opposite to the spring plate of the seat back, so that the rear end of the seat back spring is connected with the rear groove of the vertical groove of the spring plate The buckle part on the wall is positioned correspondingly to the buckle; A cushion assembly vertical plate is to make the seat cushion assembly vertical plate be located above the seat main body and the seat chassis, and to pass through the seat main body with at least one second pivot, and to make the seat cushion The pivot joint between the seat main body and the seat main body is located in front of the pivot joint between the seat main body and the seat chassis, and the front end of the support spring of the seat chassis is in contact with the front side of the seat cushion vertical plate. The seat back linkage device of the chair as described in claim 1, wherein at least one cushion spring and a tip rod are further arranged in the spring assembly groove of the seat main body, so that the front end of the seat cushion spring is assembled on the At the rear side of the seat chassis, a through hole is provided at the rear end of the seat cushion shrapnel, and the tip rod is passed through the through hole of the seat cushion shrapnel, and a stopper is provided at the bottom end of the tip rod part, so as to be in contact with the bottom surface of the seat cushion shrapnel, and the upper end of the tip rod is arranged at the rear side of the seat cushion group vertical plate, and is set between the front side of the seat cushion group vertical plate and the front end of the supporting spring piece of the seat chassis. There is a connecting plate, and the upper and lower ends of the connecting plate are respectively pivotally connected with the seat cushion assembly vertical plate and the supporting elastic piece. The seat-back linkage device of the chair according to claim 2, wherein the connecting plate is inclined from the upper rear to the lower front, so that an angle is formed between the connecting plate and the seat cushion vertical plate. The seat back linkage device of the chair according to claim 3, wherein the angle between the connecting plate and the seat cushion assembly vertical plate is 6 degrees. The seat-back interlocking device of the chair according to claim 2, wherein, the seat cushion assembly vertical plate is provided with a groove at the front bottom surface thereof, so that the connecting plate can be correspondingly accommodated in the groove. The seat-back interlocking device of the chair according to claim 1, wherein, the supporting elastic piece is gradually thrown upwards from the rear end to the front end in a curved arc shape. The seat back interlocking device of the chair as described in claim 1, wherein the seat cushion assembly vertical plate is formed with a pivot ear on the left and right sides of the bottom surface, and the seat main body is formed on the left and right A pivot portion is respectively provided at the opposite positions on the two sides, so as to be pivotally connected with the pivot ears on the two sides of the seat cushion assembly vertical plate through a second pivot axis respectively. The seat back linkage device of the chair according to claim 1, wherein, the main body of the seat is provided with a sound-absorbing sheet at the bottom of the vertical groove of the elastic sheet assembly, which is located below the seat back elastic sheet. The seat back linkage device of the chair as described in claim 1, wherein the seat back linkage device of the chair further includes a seat back control unit, and the seat back control unit includes a tenon, so that the tenon It is arranged in the vertical groove of the spring group of the seat body, and the vertical groove of the spring group is provided with at least one groove in the middle of the rear side groove wall, so as to be engaged with the tenon correspondingly. A first control board is arranged at the side, and the first control board is connected with the tenon. The seat back interlocking device of the chair as described in claim 1, wherein the seat back interlocking device of the chair further includes a lift control unit, and the lift control unit includes a second control board, and the second control board The system is set on one side of the seat cushion group vertical plate, and includes a driving handle, and the driving handle is connected with the second control board, and a hollow part is formed in the seat chassis, and the driving handle It is arranged in the hollow part of the seat chassis, and is pivotally connected with the seat chassis, and a lifting rod is set in the middle of the bottom of the seat chassis, and an actuating button is arranged on the upper end of the lifting rod, and the The upper end of the elevating rod is located in the hollow part of the seat chassis, and the front end of the driving handle is contacted with the actuating button on the upper end of the elevating rod.

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