Adjustable seat

Abstract

An adjustable seat is used for solving the problem that some seats mentioned in the background technology usually need to be adjusted step by step in various aspects, for example, a user needs to adjust the rotation angle of a seat plate and then adjust the bending degree of a back cushion, and therefore the user cannot adjust the bending degree of the back cushion after adjusting the rotation angle of the seat plate. The waist and the back of the user are still in contact with the convex part of the back cushion, and the waist and the back of the user need to bear discomfort caused by contact with the convex part of the back cushion when the user adjusts the bending degree of the back cushion according to the sequential adjustment mode, so that the experience feeling is relatively poor; however, a user can firstly adjust the bending degree of the back cushion and then adjust the rotating angle of the seat plate, but due to the subjectivity of people, the problems existing in the adjustment of the back cushion still need to be solved. Comprising four chair legs, a seat plate arranged above the chair legs and a chair back arranged above the seat plate.

Description

Technical Field

[0001] The invention relates to the technical field of furniture, in particular to an adjustable seat. Background Art

[0002] A chair is a piece of furniture used for sitting, usually used in homes, offices, schools, public transportation, etc. There are many types and materials of chairs, and you can choose chairs of various styles and materials according to different designs and uses.

[0003] In the prior art, seats generally require users to manually adjust the inclination angle of the seat back to support the user's back, so that the user can adjust the sitting posture and lean on the seat in a more comfortable state.

[0004] However, in actual operation, it is usually necessary to adjust the seat in various steps. For example, the user needs to adjust the rotation angle of the seat first, and then adjust the curvature of the cushion. Therefore, after the user adjusts the rotation angle of the seat, the user's waist and back are still in contact with the protruding part of the cushion. Adjusting in this order is likely to cause the user's waist and back to suffer discomfort from contacting the protruding part of the cushion when adjusting the curvature of the cushion, resulting in a poor user experience. However, the user can first adjust the curvature of the cushion and then adjust the rotation angle of the seat, but due to human subjectivity, the problems with the former adjustment still need to be solved. Summary of the invention

[0005] In view of the deficiencies existing in the prior art, the present invention provides an adjustable seat, which is used to solve the problem that some seats mentioned in the background technology usually need to be adjusted in various steps. For example, the user needs to adjust the rotation angle of the seat first, and then adjust the curvature of the cushion. Therefore, after the user adjusts the rotation angle of the seat, the user's waist and back are still in contact with the protruding part of the cushion. The adjustment method in this order is likely to cause the user's waist and back to bear the discomfort of contacting the protruding part of the cushion when adjusting the curvature of the cushion, resulting in a poor user experience. However, the user can first adjust the curvature of the cushion and then adjust the rotation angle of the seat. However, due to human subjectivity, the problem of the former adjustment is still a technical problem that needs to be solved.

[0006] The above technical objectives of the present invention are achieved through the following technical solutions:

[0007] An adjustable chair comprises four chair legs, a seat plate arranged above the chair legs, and a chair back arranged above the seat plate, a mounting plate is arranged below the seat plate, a rotation adjustment mechanism is arranged on the mounting plate, the rotation adjustment mechanism is connected to the seat plate, and the rotation adjustment mechanism is used to drive the front part of the seat plate to tilt up;

[0008] An elastic cushion is provided in the middle of the chair back, and a curvature adjustment mechanism is provided at the rear of the chair back, the curvature adjustment mechanism is connected to the elastic cushion, and the curvature adjustment mechanism is used to adjust the curvature of the elastic cushion;

[0009] The rotation adjustment mechanism is in transmission connection with the curvature adjustment mechanism. When the rotation adjustment mechanism drives the front part of the seat plate to tilt up, the curvature adjustment mechanism adjusts the elastic cushion to flatten; when the rotation adjustment mechanism drives the seat plate to flatten, the curvature adjustment mechanism adjusts the elastic cushion to bend and bulge toward the user's back.

[0010] Working principle:

[0011] The device is divided into two states: working state and leisure state. Working state: the seat plate is laid flat, and the elastic cushion is bent and protruded toward the back of the user; leisure state: the front part of the seat plate is tilted, and the elastic cushion is flattened.

[0012] The specific operation of the device when switching from working state to leisure state is as follows:

[0013] The rotation adjustment mechanism is started, and the rotation adjustment mechanism drives the front part of the seat plate to tilt up; the start of the rotation adjustment mechanism also drives the curvature adjustment mechanism to start, and at this time the curvature adjustment mechanism adjusts the elastic cushion to flatten.

[0014] Beneficial effects:

[0015] 1. By setting a transmission connection between the rotation adjustment mechanism and the curvature adjustment mechanism, the curvature adjustment mechanism is activated at the same time when the rotation adjustment mechanism is activated, thereby realizing the linkage effect of the front part of the seat plate being tilted up and the elastic cushion being flattened, avoiding the situation that the user's waist and back have to bear the discomfort of contacting the protruding part of the cushion when adjusting the curvature of the cushion after the user adjusts the rotation angle of the seat plate due to human subjectivity, thereby improving the user experience;

[0016] 2. By setting up a rotation adjustment mechanism and a curvature adjustment mechanism, the structure is automated and mechanized, which is convenient for users to operate. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of an embodiment of the present invention;

[0018] Figure 2 for Figure 1 A schematic diagram of the cross-sectional structure from the left;

[0019] Figure 3 for Figure 1 Schematic diagram of the structure from top view.

[0020] In the above drawings: chair legs 1, seat plate 2, chair back 3, frame 301, movable rod 302, rotating rod 3021, sleeve 3022, slider 303, auxiliary plate 4, mounting plate 6, first connecting block 7, force block 8, second rotating shaft 9, motor 10, transmission shaft 11, first base block 12, rotating rod 13, working block 14, second connecting block 15, second base block 16, first mounting shaft 17, moving block 18, second connecting rod 19, baffle 20, third connecting rod 21, third base block 22, second mounting shaft 23, elastic cushion 24, first sprocket 25, first chain 26, first bevel gear 27, second bevel gear 28, second sprocket 29, second chain 30, third sprocket 31, third chain 32, fourth base block 33, movable groove 35, threaded sleeve 36. DETAILED DESCRIPTION

[0021] The technical solution of the present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0022] Example:

[0023] like Figure 1 to Figure 3 As shown, an adjustable chair comprises four chair legs 1, a seat plate 2 arranged above the chair legs 1, and a chair back 3 arranged above the seat plate 2. A mounting plate 6 is arranged below the seat plate 2, and a rotation adjustment mechanism is arranged on the mounting plate 6. The rotation adjustment mechanism is connected to the seat plate 2, and the rotation adjustment mechanism is used to drive the front part of the seat plate 2 to tilt up; an elastic cushion 24 is arranged in the middle part of the chair back 3, and a curvature adjustment mechanism is arranged at the rear part of the chair back 3, and the curvature adjustment mechanism is connected to the elastic cushion 24, and the curvature adjustment mechanism is used to adjust the curvature of the elastic cushion 24;

[0024] The rotation adjustment mechanism is in transmission connection with the curvature adjustment mechanism. When the rotation adjustment mechanism drives the front part of the seat plate 2 to tilt up, the curvature adjustment mechanism adjusts the elastic cushion 24 to flatten; when the rotation adjustment mechanism drives the seat plate 2 to flatten, the curvature adjustment mechanism adjusts the elastic cushion 24 to bend and bulge toward the user's back.

[0025] By setting up a transmission connection between the rotation adjustment mechanism and the curvature adjustment mechanism, the curvature adjustment mechanism can be started at the same time when the rotation adjustment mechanism is started, thereby achieving the linkage effect of the front part of the seat board 2 being tilted up and the elastic cushion 24 being flattened, avoiding the situation where the user's waist and back have to endure the discomfort of contacting the protruding part of the elastic cushion 24 when adjusting the curvature of the elastic cushion 24 after the user adjusts the rotation angle of the seat board 2 due to human subjectivity, thereby improving the user experience; by setting up the rotation adjustment mechanism and the curvature adjustment mechanism, this structure is automated and mechanized, which is convenient for users to operate.

[0026] like Figure 1 to Figure 3As shown, the four chair legs 1 are arranged in groups of two on both sides of the seat plate 2, and an auxiliary plate 4 is fixed on the top of the two chair legs 1 on the same side of the seat plate 2, and the seat plate 2 is rotatably arranged between the two auxiliary plates 4; the mounting plate 6 is fixed between the four chair legs 1, and a first connecting block 7 is fixed on the mounting plate 6, and a force-bearing block 8 is fixed on the other end of the first connecting block 7, and the force-bearing block 8 is located at the mid-vertical plane in the width direction of the seat plate 2, and a second rotating shaft 9 is fixed on the bottom surface of the seat plate 2, and the length direction of the second rotating shaft 9 is consistent with the width direction of the seat plate 2, and the second rotating shaft 9 is rotatably arranged on the top surface of the force-bearing block 8, and a hemispherical groove is arranged on the top surface of the force-bearing block 8, and the outer periphery of the second rotating shaft 9 is arranged in the hemispherical groove on the top surface of the force-bearing block 8 and can rotate in the hemispherical groove; the rotation adjustment mechanism includes a motor 10, and the motor 10 is fixed on the mounting plate 6, and the output end of the motor 10 faces upward and is connected to a transmission shaft 11, and two first base blocks 1 are also fixed on the mounting plate 6 2, bearings are fixedly arranged on the two first base blocks 12, and the inner walls of the bearings on the two first base blocks 12 are fixedly arranged with vertical rotating rods 13, the two rotating rods 13 are respectively arranged on both sides of the transmission shaft 11, and the two rotating rods 13 and the transmission shaft 11 are distributed along the seat depth direction of the seat plate 2, the rotating rods 13 are threaded rods, and the thread directions of the two rotating rods 13 are opposite, and the outer periphery of the top of each rotating rod 13 is threadedly connected with a threaded sleeve 36, and the transmission shaft 11 and the two rotating rods 13 are connected with a first same The step transmission assembly, the first synchronous transmission assembly is used to drive the transmission shaft 11 and the two rotating rods 13 to rotate synchronously. Two working blocks 14 are slidably provided on the bottom surface of the seat plate 2. Two sliding grooves are provided on the bottom surface of the seat plate 2. The two working blocks 14 are slidably provided in the two sliding grooves in a one-to-one manner. The two working blocks 14 are rotatably connected with the two threaded sleeves 36 in a one-to-one manner. The rotational connection between the working blocks 14 and the corresponding threaded sleeves 36 adopts a ball joint joint, which belongs to the prior art and will not be repeated here.

[0027] Start the motor 10, and the output end of the motor 10 drives the transmission shaft 11 to rotate. The rotation of the transmission shaft 11 drives the first synchronous transmission component to work, and the work of the first synchronous transmission component drives the two rotating rods 13 to rotate synchronously with the transmission shaft 11. Since the extension and retraction directions of the two rotating rods 13 are opposite, the threaded sleeve 36 away from the chair back 3 moves upward, and the threaded sleeve 36 close to the chair back 3 moves downward, thereby driving the seat plate 2 to tilt slightly upward counterclockwise around the second rotating shaft 9, specifically achieving the effect of tilting the front part of the seat plate 2, thereby guiding the body to lean back.

[0028] like Figure 2As shown, the first synchronous transmission component includes four first sprockets 25 and two first chains 26, wherein two first sprockets 25 are fixed on the outer periphery of the transmission shaft 11, and the other two first sprockets 25 are respectively fixed on the outer peripheries of the two rotating rods 13, one of the first sprockets 25 on the transmission shaft 11 is meshed with the first sprocket 25 on one of the rotating rods 13 through one of the first chains 26, and the other first sprocket 25 on the transmission shaft 11 is meshed with the first sprocket 25 on the other rotating rod 13 through another first chain 26.

[0029] like Figure 2 As shown, a third connecting rod 21 is fixedly provided between the two chair legs 1 near the chair back 3, a third base block 22 is fixedly provided on the third connecting rod 21, a bearing is fixedly provided on the third base block 22, a vertical second mounting shaft 23 is fixedly provided on the inner wall of the bearing on the third base block 22, the curvature adjustment mechanism includes a third synchronous transmission component and a fourth synchronous transmission component, the third synchronous transmission component is provided between the second mounting shaft 23 and the rotating rod 13 near the chair back 3, and the third synchronous transmission component is used to drive the rotating rod 13 near the chair back 3 to rotate synchronously with the second mounting shaft 23; the chair back 3 includes a frame 301, a movable rod 302 and a threaded connection with the movable rod 302 Two sliders 303 are connected and can move vertically toward each other on the movable rod 302, and the elastic cushion 24 is fixed between the two sliders 303. The material of the elastic cushion 24 is tough plastic, and a relatively soft and elastic sponge pad is sleeved on the outer periphery of the plastic shell. The plastic shell of the elastic cushion 24 and the two sliders 303 are fixedly connected by welding. The vertical movement of the two sliders 303 toward each other is used to change the bending degree of the elastic cushion 24. The fourth synchronous transmission assembly is arranged between the second installation shaft 23 and the movable rod 302, and the fourth synchronous transmission assembly is used to drive the second installation shaft 23 and the movable rod 302 to rotate synchronously.

[0030] The rotation of the transmission shaft 11 also indirectly drives the third synchronous transmission assembly to work, and the work of the third synchronous transmission assembly drives the second installation shaft 23 to rotate. The rotation of the second installation shaft 23 drives the fourth synchronous transmission assembly to work. The work of the fourth synchronous transmission assembly drives the movable rod 302 to rotate. The rotation of the movable rod 302 drives the two sliders 303 to move vertically toward each other on the movable rod 302, thereby specifically changing the degree of bending of the elastic cushion 24.

[0031] like Figure 2 As shown, the third synchronous transmission assembly includes two second sprockets 29 and a second chain 30 . The two second sprockets 29 are respectively fixed on the second mounting shaft 23 and the outer periphery of the rotating rod 13 close to the seat back 3 . The second chain 30 is meshed with the two second sprockets 29 .

[0032] like Figure 2As shown, the fourth synchronous transmission assembly includes two third sprocket wheels 31 and a third chain 32. The movable rod 302 includes two rotating rods 3021 respectively rotatably arranged at the top and bottom of the frame 301, and a sleeve 3022 fixed between the two rotating rods 3021. The two rotating rods 3021 are threaded rods and the thread directions of the two rotating rods 3021 are opposite. The two sliding blocks 303 are respectively threadedly connected with the two rotating rods 3021. The two opposite side surfaces of the frame 301 are provided with vertical guide grooves. Each sliding block 303 is provided with a vertical guide groove. The two ends of the block 303 are respectively slidably arranged in the two guide grooves, and the two end faces of each slider 303 abut against the corresponding side walls of the guide groove; a fourth base block 33 is fixedly arranged on the side of the chair back 3 away from the elastic cushion 24, a bearing is fixedly arranged on the fourth base block 33, the top end of the second mounting shaft 23 is fixedly arranged on the inner wall of the bearing on the fourth base block 33, and two third sprockets 31 are respectively fixedly arranged on the second mounting shaft 23 and the outer periphery of the sleeve 3022 of the movable rod 302, and the third chain 32 is meshed with the two third sprockets 31.

[0033] like Figure 1 As shown, a second connecting block 15 is fixedly arranged between the two chair legs 1 on the same side of the seat plate 2, and second base blocks 16 are fixedly arranged on opposite sides of the two second connecting blocks 15, and bearings are fixedly arranged in the two second base blocks 16, and first mounting shafts 17 are fixedly arranged on the inner walls of the bearings on the two second base blocks 16, and the length directions of the two first mounting shafts 17 are consistent with the width direction of the seat plate 2, and a second synchronous transmission component is arranged between the transmission shaft 11 and the two first mounting shafts 17, and the second synchronous transmission component is used to drive the transmission shaft 11 and the two first The mounting shafts 17 rotate synchronously, and the two first mounting shafts 17 are both threaded rods. The outer circumferences of the two first mounting shafts 17 are both threadedly connected with moving blocks 18. The synchronous rotation of the two first mounting shafts 17 is used to drive the two moving blocks 18 to move toward each other on the corresponding first mounting shafts 17. The top surfaces of the two moving blocks 18 are fixedly provided with second connecting rods 19, and the other ends of the two second connecting rods 19 are fixedly provided with baffles 20. The two baffles 20 are respectively arranged below the two sides of the seat plate 2, and the baffles 20 are used to prevent the seat plate 2 from rotating around the two second rotating shafts 9.

[0034] The rotation of the transmission shaft 11 also drives the second synchronous transmission component to work. The work of the second synchronous transmission component drives the two first installation shafts 17 to rotate. The rotation of the two first installation shafts 17 drives the corresponding moving blocks 18 to move relative to each other. When the two baffles 20 move away from each other, the two baffles 20 disengage from the abutment with the seat board 2, thereby releasing the lock of the seat board 2 rotating function around the second rotating axis 9; when the two baffles 20 move closer to each other until the two baffles 20 abut against both sides of the seat board 2, it can prevent the seat board 2 from tilting automatically when the device is in the working state, and prevent the seat board 2 from rotating around the second rotating axis 9, which makes the device difficult to adapt to the user's riding.

[0035] like Figure 1 As shown, the second synchronous transmission assembly includes a first bevel gear 27 and two second bevel gears 28. The first bevel gear 27 is fixed on the outer periphery of the transmission shaft 11, and the two second bevel gears 28 are respectively fixed on the outer peripheries of two first mounting shafts 17. The thread directions of the two first mounting shafts 17 are the same, and the two second bevel gears 28 are respectively meshed with the first bevel gears 27.

[0036] like Figure 1-2 As shown, the chair back 3 is fixed on the top surfaces of the two auxiliary plates 4, and a movable groove 35 is provided on the end surface of the chair back 3 close to the seat plate 2, and the movable groove 35 is used to provide space for the seat plate 2 to rotate.

[0037] Working principle:

[0038] The device can be divided into two states: working state and leisure state. In working state, the seat plate 2 is laid flat, and the elastic cushion 24 is bent and convex toward the back of the user; in leisure state, the front part of the seat plate 2 is tilted, and the elastic cushion 24 is flattened.

[0039] The specific operation of the device when switching from working state to leisure state is as follows:

[0040] The motor 10 is started, and the output end of the motor 10 drives the transmission shaft 11 to rotate. The rotation of the transmission shaft 11 drives the two first sprockets 25 connected to the transmission shaft 11 to rotate. The rotation of the two first sprockets 25 connected to the transmission shaft 11 respectively drives the corresponding two first chains 26 to move. The movement of the two first chains 26 drives the other two first sprockets 25 to rotate, thereby driving the two rotating rods 13 connected to the other two first sprockets 25 to rotate. Since the rotation direction of the transmission shaft 11 is counterclockwise, the rotation direction of the two rotating rods 13 is also counterclockwise, and since the thread direction of the two rotating rods 13 is On the contrary, the rotation of the rotating rod 13 away from the seat back 3 drives the corresponding threaded sleeve 36 to move upward, and the rotation of the rotating rod 13 close to the seat back 3 drives the corresponding threaded sleeve 36 to move downward, so that the threaded sleeve 36 away from the seat back 3 pushes the corresponding working block 14 to make the front edge of the seat plate 2 rotate upward counterclockwise around the second rotating shaft 9, and the threaded sleeve 36 close to the seat back 3 pulls the corresponding working block 14 to make the rear edge of the seat plate 2 rotate downward counterclockwise around the second rotating shaft 9, so that the front part of the seat plate 2 is tilted, and at the same time, the two working blocks 14 slide in the corresponding sliding grooves to cooperate with the rotation of the seat plate 2;

[0041] The rotation of the transmission shaft 11 also drives the first bevel gear 27 to rotate, and the rotation of the first bevel gear 27 drives the two second bevel gears 28 meshing therewith to rotate, and the rotation of the two second bevel gears 28 drives the corresponding two first installation shafts 17 to rotate. Since the two second bevel gears 28 are respectively meshed on both sides of the first bevel gear 27, the rotation directions of the two second bevel gears 28 are opposite, and since the thread directions of the two first installation shafts 17 are the same, the movement directions of the two moving blocks 18 are opposite, and the two moving blocks 18 move away from each other, so that the two baffles 20 are disengaged from the abutment with the seat plate 2 and move to the bottom of the corresponding auxiliary plate 4, thereby releasing the locking of the seat plate 2 rotating function around the second rotating shaft 9;

[0042] As the rotating rod 13 close to the chair back 3 rotates, the second sprocket 29 on the rotating rod 13 close to the chair back 3 rotates synchronously, and the rotation of the second sprocket 29 on the rotating rod 13 close to the chair back 3 drives the second chain 30 to move, and the movement of the second chain 30 drives another second sprocket 29 to rotate, and the rotation of the other second sprocket 29 drives the second mounting shaft 23 connected thereto to rotate; the rotation of the second mounting shaft 23 drives the third sprocket 31 connected thereto to rotate, and the rotation of the third sprocket 31 on the second mounting shaft 23 drives the third chain 32 to move, and the movement of the third chain 32 drives another third sprocket 31 to rotate, and the rotation of the other third sprocket 31 drives the sleeve 3022 connected thereto to rotate, and the rotation of the sleeve 3022 drives the two rotating rods 3021 to rotate. Since the thread directions of the two rotating rods 3021 are opposite, the two sliders 303 move away from each other on the two rotating rods 3021, thereby flattening the elastic cushion 24.

[0043] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution of the present invention, which should be included in the scope of the claims of the present invention.

Claims

1. An adjustable chair, comprising four chair legs (1), a seat plate (2) disposed above the chair legs (1), and a chair back (3) disposed above the seat plate (2), characterized in that: A mounting plate (6) is provided below the seat plate (2), and a rotation adjustment mechanism is provided on the mounting plate (6), the rotation adjustment mechanism being connected to the seat plate (2) and used for driving the front part of the seat plate (2) to tilt up; An elastic cushion (24) is provided in the middle of the chair back (3), and a curvature adjustment mechanism is provided at the rear of the chair back (3), the curvature adjustment mechanism is connected to the elastic cushion (24), and the curvature adjustment mechanism is used to adjust the curvature of the elastic cushion (24); The rotation adjustment mechanism is in transmission connection with the curvature adjustment mechanism. When the rotation adjustment mechanism drives the front part of the seat plate (2) to tilt up, the curvature adjustment mechanism adjusts the elastic cushion (24) to flatten; when the rotation adjustment mechanism drives the seat plate (2) to flatten, the curvature adjustment mechanism adjusts the elastic cushion (24) to bend and bulge toward the back of the user.

2. An adjustable seat according to claim 1, characterized in that: The four chair legs (1) are arranged in groups of two on both sides of the seat plate (2), and an auxiliary plate (4) is fixedly provided at the top ends of the two chair legs (1) on the same side of the seat plate (2), and the seat plate (2) is rotatably arranged between the two auxiliary plates (4); the mounting plate (6) is fixedly provided between the four chair legs (1), and a first connecting block (7) is fixedly provided on the mounting plate (6), and a force-bearing block (8) is fixedly provided at the other end of the first connecting block (7), and the force-bearing block (8) is located at the mid-vertical plane in the width direction of the seat plate (2); a second rotating shaft (9) is fixedly provided on the bottom surface of the seat plate (2), and the length direction of the second rotating shaft (9) is consistent with the width direction of the seat plate (2), and the second rotating shaft (9) is rotatably arranged on the top surface of the force-bearing block (8); the rotation adjustment mechanism comprises a motor (10), and the motor (10) is fixedly provided on the mounting plate (6), and the output end of the motor (10) faces upward and is connected to a transmission shaft (11). The mounting plate (6) is also fixedly provided with two first base blocks (12), and the two first base blocks (12) are both fixedly provided with bearings. The inner walls of the bearings on the two first base blocks (12) are both fixedly provided with vertical rotating rods (13). The two rotating rods (13) are respectively arranged on both sides of the transmission shaft (11), and the two rotating rods (13) and the transmission shaft (11) are distributed along the seat depth direction of the seat plate (2). The rotating rods (13) are threaded rods, and the thread directions of the two rotating rods (13) are opposite. The outer periphery of each rotating rod (13) is threadedly connected with a threaded sleeve (36). A first synchronous transmission component is connected between the transmission shaft (11) and the two rotating rods (13), and the first synchronous transmission component is used to drive the transmission shaft (11) and the two rotating rods (13) to rotate synchronously. Two working blocks (14) are slidably provided on the bottom surface of the seat plate (2), and the two working blocks (14) are rotationally connected with the two threaded sleeves (36) in a one-to-one correspondence.

3. An adjustable seat according to claim 2, characterized in that: The first synchronous transmission component comprises four first sprockets (25) and two first chains (26), wherein the two first sprockets (25) are fixed on the outer periphery of the transmission shaft (11), and the other two first sprockets (25) are respectively fixed on the outer peripheries of the two rotating rods (13); one of the first sprockets (25) on the transmission shaft (11) is meshed with the first sprocket (25) on one of the rotating rods (13) via one of the first chains (26), and the other first sprocket (25) on the transmission shaft (11) is meshed with the first sprocket (25) on the other rotating rod (13) via another first chain (26).

4. The adjustable seat according to claim 1, characterized in that: A third connecting rod (21) is fixedly arranged between two chair legs (1) near the chair back (3); a third base block (22) is fixedly arranged on the third connecting rod (21); a bearing is fixedly arranged on the third base block (22); a vertical second mounting shaft (23) is fixedly arranged on the inner wall of the bearing on the third base block (22); the curvature adjustment mechanism comprises a third synchronous transmission component and a fourth synchronous transmission component; the third synchronous transmission component is arranged between the second mounting shaft (23) and a rotating rod (13) near the chair back (3); the third synchronous transmission component is used to drive the rotating rod (13) near the chair back (3) and the second mounting shaft (23) synchronous rotation; the chair back (3) comprises a frame (301), a movable rod (302) and two sliders (303) threadedly connected to the movable rod (302) and vertically movable toward each other on the movable rod (302); the elastic cushion (24) is fixedly arranged between the two sliders (303); the vertical movement of the two sliders (303) toward each other is used to change the bending degree of the elastic cushion (24); the fourth synchronous transmission component is arranged between the second installation shaft (23) and the movable rod (302); the fourth synchronous transmission component is used to drive the second installation shaft (23) and the movable rod (302) to rotate synchronously.

5. An adjustable seat according to claim 4, characterized in that: The third synchronous transmission assembly comprises two second sprockets (29) and a second chain (30). The two second sprockets (29) are respectively fixed on the second mounting shaft (23) and the outer periphery of the rotating rod (13) close to the chair back (3). The second chain (30) is meshed with the two second sprockets (29).

6. The adjustable seat according to claim 4, characterized in that: The fourth synchronous transmission assembly comprises two third sprocket wheels (31) and a third chain (32); the movable rod (302) comprises two rotating rods (3021) respectively rotatably arranged at the top and bottom of the frame (301), and a sleeve (3022) fixedly arranged between the two rotating rods (3021); the two rotating rods (3021) are threaded rods and the thread directions of the two rotating rods (3021) are opposite; the two opposite side surfaces of the frame (301) are both provided with vertical guide grooves; the two sliders (303) are respectively threadedly connected to the two rotating rods (3021); each slider (303) is threadedly connected to the two rotating rods (3021); 03) are respectively slidably arranged in two guide grooves, and the two end faces of each slider (303) are in contact with the corresponding side walls of the guide groove; a fourth base block (33) is fixedly arranged on the side of the chair back (3) away from the elastic cushion (24), a bearing is fixedly arranged on the fourth base block (33), the top end of the second mounting shaft (23) is fixedly arranged on the inner wall of the bearing on the fourth base block (33), two third sprockets (31) are respectively fixedly arranged on the second mounting shaft (23) and the outer periphery of the sleeve (3022) of the movable rod (302), and the third chain (32) is meshed with the two third sprockets (31).

7. The adjustable seat according to claim 1, characterized in that: A second connecting block (15) is fixedly arranged between two chair legs (1) located on the same side of the seat plate (2), and second base blocks (16) are fixedly arranged on opposite sides of the two second connecting blocks (15). Bearings are fixedly arranged in the two second base blocks (16), and first mounting shafts (17) are fixedly arranged on the inner walls of the bearings on the two second base blocks (16). The length directions of the two first mounting shafts (17) are consistent with the width direction of the seat plate (2). A second synchronous transmission component is arranged between the transmission shaft (11) and the two first mounting shafts (17), and the second synchronous transmission component is used to drive the transmission shaft (11) and the two first mounting shafts (17) to rotate. The two first mounting shafts (17) are threaded rods, and the outer circumferences of the two first mounting shafts (17) are threadedly connected with moving blocks (18). The synchronous rotation of the two first mounting shafts (17) is used to drive the two moving blocks (18) to move toward each other on the corresponding first mounting shafts (17). The top surfaces of the two moving blocks (18) are fixedly provided with second connecting rods (19), and the other ends of the two second connecting rods (19) are fixedly provided with baffles (20). The two baffles (20) are respectively arranged below the two sides of the seat plate (2), and the baffles (20) are used to prevent the seat plate (2) from rotating around the two second rotating shafts (9).

8. An adjustable seat according to claim 7, characterized in that: The second synchronous transmission assembly comprises a first bevel gear (27) and two second bevel gears (28); the first bevel gear (27) is fixedly arranged on the outer periphery of the transmission shaft (11); the two second bevel gears (28) are respectively fixedly arranged on the outer peripheries of two first mounting shafts (17); the thread directions of the two first mounting shafts (17) are the same; and the two second bevel gears (28) are respectively meshed with the first bevel gears (27).

9. The adjustable seat according to claim 1, characterized in that: The chair back (3) is fixed on the top surfaces of the two auxiliary plates (4), and a movable groove (35) is provided on the end surface of the chair back (3) close to the seat plate (2), and the movable groove (35) is used to provide space for the seat plate (2) to rotate.

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