CN118743498A - Back and seat cushion support structure with adaptive sitting posture correction and adjustment and study chair thereof - Google Patents

Abstract

The present invention discloses a back and seat cushion support structure with adaptive sitting posture correction and adjustment and a study chair thereof, comprising a support mechanism and an adjustment mechanism, wherein the support mechanism comprises a seat cushion support structure and a chair back support structure, the adjustment mechanism is used for adjusting the front and rear position of the chair back support structure, and the seat cushion support structure is connected to the adjustment mechanism through a linkage component. The present invention solves the problem that when a user does not sit on the chair with a correct sitting posture and does not actively make the back contact with the chair back, the chair back and the user's back will not fit together, and the back cannot be fully supported, the user is prone to feel tired and change the sitting posture, and the user's incorrect sitting posture for a long time is likely to affect physical development.

Description

Back and seat cushion support structure with adaptive sitting posture correction and adjustment and study chair thereof

Technical Field

The invention relates to the technical field of learning chairs, in particular to a back and seat cushion supporting structure capable of adaptively correcting and adjusting sitting posture and a learning chair.

Background Art

Chairs are a kind of daily furniture with backrests and armrests. According to different scene requirements and functional requirements, they are divided into dining chairs, study chairs, ergonomic chairs, etc.

Study chairs are commonly used seats in students' study life and are widely used. Faced with a large number of students, the seat cushion and backrest of the study chair need to be adjustable to meet the comfort requirements of students of different heights and body shapes for the study chair. Existing study chairs usually manually adjust the height of the seat cushion and the angle of the backrest. The comparative document CN202311100142.0 discloses a study chair that automatically adjusts the angle and height of the backrest. It specifically discloses a mounting plate and an adapter device. The adapter device is evenly installed on the mounting plate. The adapter device also includes an adjustment device, an auxiliary device, a lifting mechanism and a support device. The present invention adjusts the equipment by starting the adjustment device, and the auxiliary device connected thereto cooperates to change the angle, and the height of the support device is adjusted by the lifting mechanism of the installation base plate, and the sliding support device adaptively retracts the equipment. However, in actual use, when the user does not sit on the chair with the correct sitting posture and does not actively let the back touch the chair back, the back of the learning chair will not fit the user's back and cannot provide complete support for the back. The user is prone to feeling tired and changing his sitting posture. For a long time, incorrect sitting posture can easily affect the user's physical development.

Summary of the invention

The purpose of the present invention is to solve the problem that if the user does not sit on the chair in the correct sitting posture and does not actively let the back touch the chair back, the back of the learning chair will not fit the user's back, and the back cannot be fully supported. The user is prone to feel tired and change his sitting posture, which may cause the user's incorrect sitting posture for a long time and affect his physical development. The present invention provides a back and seat cushion support structure with adaptive sitting posture correction and adjustment and a learning chair.

The present invention achieves the above-mentioned purpose through the following technical solutions:

A back and seat cushion support structure with adaptive sitting posture correction and adjustment, comprising a support mechanism and an adjustment mechanism, wherein the support mechanism comprises a seat cushion support structure and a seat back support structure, the adjustment mechanism is used to adjust the front and rear position of the seat back support structure, and the seat cushion support structure is connected to the adjustment mechanism through a linkage component;

The adjustment mechanism includes a moving block which is internally divided into a plurality of groups of hollow chambers, each group of hollow chambers of the moving block is provided with a driving assembly, a carrying plate is movably provided on one side of the moving block, the carrying plate is adapted to be linked with the driving assembly, a lifting rod in the linkage component is provided below the moving block, and the front and rear positions of the carrying plate are adjusted by changing the up and down positions of the lifting rod to operate the driving assembly.

Furthermore, the seat cushion support structure includes a seat cushion, a seat plate is arranged below the seat cushion, and a plurality of first springs are arranged between the seat cushion and the seat plate to facilitate the change of the upper and lower positions of the seat cushion.

Furthermore, the chair back support structure includes a head support component, a back support component and a waist support component.

Furthermore, the head support component includes a headrest, a plug-in block is provided on the back side of the headrest, a plurality of positioning grooves are provided on both sides of the plug-in block, a fixing block is provided on the top of the supporting plate, the fixing block is provided with a plug-in groove matched with the plug-in block, two groups of through holes are provided on one side of the fixing block, positioning columns are movably inserted in the two groups of through holes, the two groups of positioning columns are connected to each other, a positioning block is provided on the inner side of the positioning column, the positioning block is matched with the positioning groove, a raised block is provided on the surface of the fixing block on the outer ring of the positioning column, the raised block serves as a limit for the positioning column, and a second spring is provided on the outer ring of the positioning column, the second spring is located between the fixing block and the raised block.

Furthermore, the back support component includes an adjustment plate, two groups of guide blocks are arranged at the center position of one side of the adjustment plate, one side of the adjustment plate is slidably connected with angle adjustment blocks at both sides of the guide blocks, a follower plate is arranged at the end of the angle adjustment block, the bearing plate is provided with a first guide groove matched with the guide block, a plurality of third springs are arranged between the guide block and the first guide groove, the angle adjustment block is rotatably connected to the bearing plate at the corner, two groups of first backrests are connected to one side of the upper part of the adjustment plate through a connecting piece, and the second backrest is connected to one side of the follower plate through a connecting piece.

Furthermore, the lumbar support component includes two groups of lumbar supports, which are installed on one side of the lower part of the adjustment plate through a connecting piece, and a U-shaped block is provided on the other side of the adjustment plate, and a U-shaped adjusting piece is movably provided inside the U-shaped block, and both ends of the U-shaped adjusting piece pass through the adjustment plate and are rotatably connected to the lumbar supports respectively, and a first knob is provided on the outer side of the U-shaped block, and the first knob is fixedly connected with a stud, and the stud passes through the U-shaped block and is connected by threads, and the end of the stud is movably connected to the U-shaped adjusting piece.

Furthermore, the driving assembly includes a rotating shaft rotatably connected to the cavity of the moving block, and the rotating shaft is provided with a first gear and a second gear in sequence from the outside to the inside, and a plurality of groups of first racks are provided on the rear side of the supporting plate, and the first racks are meshed with the first gears, and a plurality of guide columns are provided on the rear side of the supporting plate below the first racks, and a plurality of second guide grooves adapted to the guide columns are provided in the inner cavity of the moving block, and a plurality of groups of second racks are provided on the upper end of the lifting rod, and the second racks are meshed with the second gears.

Further, the linkage component includes the lifting rod, the lifting rod is movably connected in the positioning tube, a plurality of positioning holes are equidistantly provided on the side of the lifting rod, a positioning component is provided on the side of the positioning tube, a connecting plate is provided at the end of the positioning tube, and the connecting plate is connected to the bottom of the seat cushion;

The positioning component includes a fixing stud, which is connected to the positioning tube by a thread, a latch is movably provided in the inner cavity of the fixing stud, a fourth spring is provided on the outer ring of the latch, the fourth spring is located between the latch and the fixing stud, and a second knob is fixedly connected to the end of the latch.

A study chair comprises supporting chair legs, wherein a chair rod is arranged at one end of the upper part of the supporting chair legs, the seat cushion supporting structure is connected to the chair rod via a first locking member, the adjustment mechanism is connected to the chair rod via a second locking member, armrests are arranged on both sides of the seat plate in the seat cushion supporting structure, and a footrest is arranged at the front end of the supporting chair legs.

Compared with the prior art, the present invention has the following beneficial effects:

1. When in use, the seat cushion support structure holds the user and generates downward pressure, driving the linkage component to drive the adjustment mechanism. The adjustment mechanism drives the seat back support structure to move forward to fit the user's entire back, realizing the function of the seat back support structure automatically catching up with the back;

2. After the user sits down, the seat cushion presses down the lifting rod to operate the driving assembly to move the load-bearing plate forward, so that the chair back support structure can follow the user's back in time to provide support;

3. When the user sits on the seat cushion, the first spring is compressed, causing the seat cushion to move downward. When the user stands up, the first spring rebounds, causing the seat cushion to return to its original position. This can change the up and down position of the seat cushion, thereby achieving the function of adjusting the up and down movement of the linkage component;

4. The user's back contacts and squeezes the first backrest, and the adjustment plate moves backwards accordingly, driving the angle adjustment block to rotate at the same time. One end slides on the adjustment plate, and the other end changes its position angle, so that the second backrest is close to the back, and the user's back is fitted as a whole. The back fitting effect will change according to the degree of the user's backward squeezing force, achieving the function of adaptive correction and adjustment;

5. The connecting piece arranged at the back of the first backrest and the second backrest can change the angle. According to the back posture of the user, the first backrest and the second backrest can adaptively change the angle to fit the back;

6. Rotate the first knob to turn the stud to adjust the front and rear position of the U-shaped adjustment member, thereby changing the support angle of the lumbar support;

7. In order to adapt to users of different heights, it is necessary to change the up and down position of the adjustment mechanism, and the linkage components also need to be adjusted accordingly. Pull the second knob to pull the pin out of the positioning hole, and the lifting rod can move up and down in the positioning tube with the adjustment mechanism. After the position is adjusted, loosen the second knob to insert the pin into the positioning hole to fix the position of the lifting rod.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG1 is a schematic diagram of a support structure of the present invention;

Fig. 2 is a schematic diagram of the adjustment structure of the present invention;

FIG3 is a schematic diagram of a seat cushion support structure of the present invention;

FIG4 is a schematic diagram of the structure of the head support component of the present invention;

FIG5 is a schematic diagram of the structure of the back support component of the present invention;

FIG6 is a schematic diagram of the back support component of the present invention from another perspective;

FIG7 is a schematic diagram of the structure of the waist support component of the present invention;

FIG8 is a schematic diagram of the structure of a driving assembly of the present invention;

FIG9 is a schematic diagram of the structure of the linkage components of the present invention;

FIG10 is a schematic diagram of the structure of a positioning component of the present invention;

FIG11 is a schematic structural diagram of a study chair according to the present invention;

FIG. 12 is a schematic diagram of the study chair of the present invention from another viewing angle.

In the figure, 1-support mechanism, 2-adjustment mechanism, 3-linkage component, 4-supporting chair foot, 5-chair rod, 6-first locking member, 7-second locking member, 8-armrest, 9-footrest;

11-seat cushion support structure, 12-seat back support structure, 21-moving block, 22-driving assembly, 23-carrying plate, 31-lifting rod, 32-positioning tube, 33-positioning hole, 34-positioning component, 35-connecting plate;

111-seat cushion, 112-seat plate, 113-first spring, 121-head support component, 122-back support component, 123-lumbar support component, 221-rotating shaft, 222-first gear, 223-second gear, 224-first rack, 225-guide column, 226-second guide groove, 227-second rack, 341-fixing stud, 342-pin, 343-fourth spring, 344-second knob;

1210-positioning block, 1211-headrest, 1212-plug-in block, 1213-positioning slot, 1214-fixed block, 1215-plug-in slot, 1216-through hole, 1217-positioning column, 1218-protruding block, 1219-second spring, 1221-adjusting plate, 1222-guide block, 1223-angle adjustment block, 1224-follow-up plate, 1225-first guide slot, 1226-third spring, 1227-first backrest, 1228-second backrest, 1231-lumbar support, 1232-U-shaped block, 1233-U-shaped adjustment piece, 1234-first knob, 1235-stud.

DETAILED DESCRIPTION

The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

As shown in FIG. 1-2 , a back and seat cushion support structure with adaptive sitting posture correction adjustment includes a support mechanism 1 and an adjustment mechanism 2. The support mechanism 1 includes a seat cushion support structure 11 and a seat back support structure 12. The adjustment mechanism 2 is used to adjust the front and rear position of the seat back support structure 12. The seat cushion support structure 11 is connected to the adjustment mechanism 2 through a linkage component 3. When in use, the seat cushion support structure 11 supports the user and generates downward pressure, driving the linkage component 3 to drive the adjustment mechanism 2, thereby realizing the function of adjusting the front and rear position of the seat back support structure 12.

The adjustment mechanism 2 includes a moving block 21 which is internally divided into a plurality of groups of hollow chambers. Each group of hollow chambers of the moving block 21 is provided with a driving assembly 22. A bearing plate 23 is movably provided on one side of the moving block 21. A chair back support structure 12 is provided on the bearing plate 23. The bearing plate 23 is adapted to be linked with the driving assembly 22. A lifting rod 31 in the linkage component 3 is provided under the moving block 21. After the user sits down, the lifting rod 31 is pressed down to operate the driving assembly 22 to move the bearing plate 23 forward, so that the chair back support structure 12 can promptly follow the user's back to provide support after the user sits down.

As shown in Figure 3, the seat cushion support structure 11 includes a seat cushion 111, a seat plate 112 is arranged below the seat cushion 111, and a plurality of first springs 113 are arranged between the seat cushion 111 and the seat plate 112. When a user sits on the seat cushion 111, the first springs 113 are compressed, causing the seat cushion 111 to move downward. After the user stands up, the first springs 113 rebound, causing the seat cushion 111 to return to its original position, thereby achieving the function of changing the upper and lower positions of the seat cushion 111.

As shown in FIG. 1 , the chair back support structure 12 includes a head support component 121 , a back support component 122 and a waist support component 123 .

As shown in FIG. 4 , the head support component 121 includes a headrest 1211, a plug-in block 1212 is provided on the back side of the headrest 1211, and a plurality of positioning grooves 1213 are provided on both sides of the plug-in block 1212. A fixing block 1214 is provided on the top of the carrier plate 23, and the fixing block 1214 is provided with a plug-in groove 1215 adapted to the plug-in block 1212. Two groups of through holes 1216 are provided on one side of the fixing block 1214, and positioning columns 1217 are movably inserted in the two groups of through holes 1216. The two groups of positioning columns 1217 are connected to each other, and a positioning block 1210 is provided on the inner side of the positioning column 1217, and the positioning block 1210 is adapted to the positioning groove 1213. The surface of the fixed block 1214 is located on the outer ring of the positioning column 1217 and a raised block 1218 is provided. The raised block 1218 limits the positioning column 1217. The outer ring of the positioning column 1217 is provided with a second spring 1219. The second spring 1219 is located between the fixed block 1214 and the raised block 1218. The positioning column 1217 is pressed, and the positioning block 1210 is misaligned with the positioning groove 1213. At this time, the headrest 1211 can be adjusted up and down. The positioning column 1217 is released. Under the action of the second spring 1219, the positioning column 1217 is reset and the positioning block 1210 is clamped with the positioning groove 1213 to fix the position of the headrest 1211.

As shown in Figures 5 and 6, the back support component 122 includes an adjustment plate 1221, two sets of guide blocks 1222 are arranged at the center of one side of the adjustment plate 1221, and angle adjustment blocks 1223 are slidably connected to the side of the adjustment plate 1221 at both sides of the guide blocks 1222. A follower plate 1224 is arranged at the end of the angle adjustment block 1223, and the bearing plate 23 is provided with a first guide groove 1225 adapted to the guide block 1222. A plurality of third springs 1226 are arranged between the guide block 1222 and the first guide groove 1225. The angle adjustment block 1223 is rotatably connected to the supporting plate 23 at the corner, and one side of the upper part of the adjustment plate 1221 is connected to two groups of first backrests 1227 through a connecting piece, and one side of the follower plate 1224 is connected to the second backrest 1228 through a connecting piece. The user's back contacts and is squeezed backwards by the first backrest 1227, and the adjustment plate 1221 moves backward, thereby driving the angle adjustment block 1223 to rotate, with one end sliding on the adjustment plate 1221 and the other end changing its position angle, so that the second backrest 1228 is close to the back, and the user's back is fitted as a whole.

As shown in Figure 7, the lumbar support component 123 includes two groups of lumbar supports 1231, which are installed on one side of the lower part of the adjustment plate 1221 through a connecting piece, and a U-shaped block 1232 is provided on the other side of the adjustment plate 1221. A U-shaped adjusting piece 1233 is movably provided inside the U-shaped block 1232, and both ends of the U-shaped adjusting piece 1233 pass through the adjustment plate 1221 and are rotatably connected to the lumbar support 1231 respectively, and a first knob 1234 is provided on the outer side of the U-shaped block 1232. The first knob 1234 is fixedly connected with a stud 1235, which passes through the U-shaped block 1232 and is connected by threads, and the end of the stud 1235 is movably connected to the U-shaped adjusting piece 1233. The first knob 1234 is rotated to rotate the stud 1235 to adjust the front and rear position of the U-shaped adjusting piece 1233, thereby changing the support angle of the lumbar support 1231.

As shown in Figure 8, the driving assembly 22 includes a rotating shaft 221 rotatably connected to the cavity of the moving block 21, and the first gear 222 and the second gear 223 are arranged on the rotating shaft 221 from the outside to the inside. A plurality of first racks 224 are arranged on the rear side of the supporting plate 23, and the first racks 224 are meshed with the first gear 222. A plurality of guide posts 225 are arranged on the rear side of the supporting plate 23 below the first rack 224, and a plurality of second guide grooves 226 matched with the guide posts 225 are arranged in the inner cavity of the moving block 21. A plurality of second racks 227 are arranged on the upper end of the lifting rod 31, and the second racks 227 are meshed with the second gear 223.

As shown in Figures 9 and 10, the linkage component 3 includes a lifting rod 31, which is movably connected in a positioning tube 32. A plurality of positioning holes 33 are equidistantly provided on the side of the lifting rod 31, a positioning component 34 is provided on the side of the positioning tube 32, and a connecting plate 35 is provided at the end of the positioning tube 32, and the connecting plate 35 is connected to the bottom of the seat cushion 111;

The positioning component 34 includes a fixing stud 341, which is connected to the positioning tube 32 by a thread. A pin 342 is movably provided in the inner cavity of the fixing stud 341, and a fourth spring 343 is provided on the outer ring of the pin 342. The fourth spring 343 is located between the pin 342 and the fixing stud 341. A second knob 344 is fixedly connected to the end of the pin 342. In order to adapt to users of different heights, the up and down positions of the adjustment mechanism 2 need to be changed, and the linkage component 3 also needs to be adjusted accordingly. The second knob 344 is pulled to pull the pin 342 out of the positioning hole 33, and the lifting rod 31 can move up and down in the positioning tube 32 along with the adjustment mechanism 2. After the position is adjusted, the second knob 344 is released to allow the pin 342 to be inserted into the positioning hole 33, so that the position of the lifting rod 31 is fixed.

As shown in Figures 11 and 12, a study chair includes a supporting leg 4, a chair rod 5 is arranged at one end of the upper part of the supporting leg 4, a seat cushion supporting structure 11 is connected to the chair rod 5 through a first locking member 6, an adjustment mechanism 2 is connected to the chair rod 5 through a second locking member 7, armrests 8 are arranged on both sides of a seat plate 112 in the seat cushion supporting structure 11, and a footrest 9 is arranged at the front end of the supporting leg 4.

It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims (9)

1. Back and cushion bearing structure that adjusts is corrected in position of sitting self-adaptation, its characterized in that: the seat cushion supporting mechanism comprises a supporting mechanism (1) and an adjusting mechanism (2), wherein the supporting mechanism (1) comprises a seat cushion supporting structure (11) and a seat back supporting structure (12), the adjusting mechanism (2) is used for adjusting the front and back positions of the seat back supporting structure (12), and the seat cushion supporting structure (11) is connected with the adjusting mechanism (2) through a linkage part (3);

The adjusting mechanism (2) comprises a moving block (21) with a plurality of groups of empty cavities at the inner part, a driving assembly (22) is arranged in each group of empty cavities of the moving block (21), a bearing plate (23) is movably arranged on one side of the moving block (21), the bearing plate (23) is linked with the driving assembly (22) in a matched mode, lifting rods (31) in the linkage part (3) are arranged below the moving block (21), and the front and rear positions of the bearing plate (23) are adjusted by changing the upper and lower positions of the lifting rods (31) to operate the driving assembly (22).

2. A sitting posture adaptive correction adjusted back and cushion support structure according to claim 1, wherein: the seat cushion supporting structure (11) comprises a seat cushion (111), a seat plate (112) is arranged below the seat cushion (111), and a plurality of first springs (113) are arranged between the seat cushion (111) and the seat plate (112), so that the upper position and the lower position of the seat cushion (111) can be changed conveniently.

3. A sitting posture adaptive correction adjusted back and cushion support structure according to claim 2, wherein: the back support structure (12) includes a head support member (121), a back support member (122), and a lumbar support member (123).

4. A sitting posture adaptive correction adjusted back and cushion support structure according to claim 3, wherein: the head support component (121) comprises a headrest (1211), an inserting block (1212) is arranged on the back side of the headrest (1211), a plurality of positioning grooves (1213) are formed in the two sides of the inserting block (1212), a fixing block (1214) is arranged on the top end of the bearing plate (23), an inserting groove (1215) matched with the inserting block (1212) is formed in the fixing block (1214), two groups of through holes (1216) are formed in one side surface of the fixing block (1214), positioning columns (1217) are movably inserted in the two groups of through holes (1216), the two groups of positioning columns (1217) are connected with each other, a positioning block (1210) is arranged on the inner side surface of the positioning column (1217), a protruding outer ring (1218) is arranged on the outer ring of the positioning column (1217), a limiting effect is achieved on the positioning column (1218), a second spring (1219) is arranged between the second spring (1219) and the second spring (1219).

5. A sitting posture adaptive correction adjusted back and cushion support structure according to claim 4, wherein: the back support part (122) comprises an adjusting plate (1221), two groups of guide blocks (1222) are arranged at the center of one side surface of the adjusting plate (1221), angle adjusting blocks (1223) are slidably connected to one side surface of the adjusting plate (1221) at two side positions of the guide blocks (1222), follow-up plates (1224) are arranged at the tail ends of the angle adjusting blocks (1223), first guide grooves (1225) matched with the guide blocks (1222) are formed in the bearing plate (23), a plurality of third springs (1226) are arranged between the guide blocks (1222) and the first guide grooves (1225), the corner of the angle adjusting block (1223) is rotationally connected to the bearing plate (23), two groups of first backs (1227) are connected to one side surface of the upper portion of the adjusting plate (1221) through connecting pieces, and second backs (1228) are connected to one side surface of the follow-up plates (1224) through connecting pieces.

6. A sitting posture adaptive correction adjusted back and cushion support structure according to claim 5, wherein: the waist supporting part (123) comprises two groups of waist supports (1231), the waist supports (1231) are installed on one side face of the lower portion of the adjusting plate (1221) through connecting pieces, a U-shaped block (1232) is arranged on the other side face of the adjusting plate (1221), U-shaped adjusting pieces (1233) are movably arranged inside the U-shaped block (1232), two ends of each U-shaped adjusting piece (1233) penetrate through the adjusting plate (1221) and are respectively connected with the waist supports (1231) in a rotating mode, first knobs (1234) are arranged on the outer sides of the U-shaped blocks (1232), studs (1235) are fixedly connected with the corresponding studs (1235) and penetrate through the U-shaped blocks (1232) and are in threaded connection, and the tail ends of the studs (1235) are movably connected with the U-shaped adjusting pieces (1233).

7. A sitting posture adaptive correction adjusted back and cushion support structure according to claim 6, wherein: the driving assembly (22) comprises a rotating shaft (221) which is rotationally connected in a cavity of the moving block (21), a first gear (222) and a second gear (223) are sequentially arranged on the rotating shaft (221) from outside to inside, a plurality of groups of first racks (224) are arranged on the rear side of the bearing plate (23), the first racks (224) are meshed with the first gears (222), a plurality of guide posts (225) are arranged below the first racks (224) on the rear side of the bearing plate (23), a plurality of second guide grooves (226) which are matched with the guide posts (225) are formed in the inner cavity of the moving block (21), a plurality of groups of second racks (227) are arranged at the upper end of the lifting rod (31), and the second racks (227) are meshed with the second gears (223).

8. A sitting posture adaptive correction adjusted back and cushion support structure according to claim 7, wherein: the linkage component (3) comprises a lifting rod (31), the lifting rod (31) is movably connected in a positioning pipe (32), a plurality of positioning holes (33) are formed in the side surface of the lifting rod (31) at equal intervals, a positioning component (34) is arranged on the side surface of the positioning pipe (32), a connecting plate (35) is arranged at the tail end of the positioning pipe (32), and the connecting plate (35) is connected with the bottom of the seat cushion (111);

The positioning component (34) comprises a fixed stud (341), the fixed stud (341) is connected with the positioning pipe (32) through threads, a plug pin (342) is movably arranged in an inner cavity of the fixed stud (341), a fourth spring (343) is arranged on the outer ring of the plug pin (342), the fourth spring (343) is located between the plug pin (342) and the fixed stud (341), and a second knob (344) is fixedly connected to the tail end of the plug pin (342).

9. A learning chair, characterized in that: including supporting chair foot (4), supporting chair foot (4) upper portion one end is provided with chair pole (5), cushion bearing structure (11) through first retaining member (6) with chair pole (5) are connected, adjustment mechanism (2) through second retaining member (7) with chair pole (5) are connected, in cushion bearing structure (11) bedplate (112) both sides are provided with handrail (8), supporting chair foot (4) front end is provided with pedal (9).