CN113796663B - Sitting posture correcting device - Google Patents

Abstract

The invention discloses a sitting posture correcting device, which relates to the field of health medical appliances and comprises a chair seat, chair legs and a chair back, wherein the upper surface of the chair seat is provided with a groove, the inner side wall of the groove is rotatably provided with the chair back, the top of the chair back is rotatably provided with a correcting device, the outer side of the chair back is provided with a supporting device which enables the correcting device to be always in the horizontal direction, and the bottom of the chair seat is rotatably provided with a retractable chair leg.

Description

Sitting posture correcting device

Technical Field

The invention relates to the field of health medical equipment, in particular to a sitting posture correcting device.

Background

The middle and primary school is in the golden period of physical development, and this age stage is motionless, and study lessons are heavier, often sit in front of the desk for a long time, under the incorrect condition of position of sitting, have very big influence to eyesight, most teenager's vision problem now is because of incorrect position of sitting, in prior art, general seat does not possess the function of correction, thereby lead to student's humpback phenomenon to take place, and common correcting unit, if dorsad is good, through taking X type to install in the back of human body with powerful belt, the centre is through the band tying the belly of human body, extrude human belly, long-time use can lead to the phenomenon that human body appetite is poor to take place, influence human health, and correction effect is not good, therefore a position of sitting correcting unit is required, in order to solve above-mentioned problem.

Disclosure of Invention

The invention aims to provide a sitting posture correction device which solves the problems that the existing correction device proposed in the background art is poor in correction effect and cannot be installed on a chair.

In order to achieve the above purpose, the present invention provides the following technical solutions: the utility model provides a position of sitting correcting unit, includes seat support, chair leg and back of the chair, the seat support upper surface is seted up flutedly, the back of the chair is installed in the recess inside wall rotation, the correcting unit body is installed in the top rotation of back of the chair, the strutting arrangement who makes correcting unit body be in the horizontal direction all the time is installed in the outside of back of the chair, collapsible chair leg is installed in the bottom rotation of seat support.

In a further embodiment, a bump for installing a supporting device is fixedly installed above one side, which is contacted with the groove, of the chair back, the supporting device comprises a first supporting rod and a second supporting rod, the first supporting rod is rotationally connected with the bump, the second supporting rod is slidingly installed inside the other end face of the first supporting rod, a certain damping is arranged between the inner side wall of the first supporting rod and the outer side wall of the second supporting rod, a slidable connecting device is installed inside one side, which is contacted with the correcting device body, of the other end of the second supporting rod, the connecting device is rotationally connected with the outer side wall of the correcting device body, when the chair back rotates, the second supporting rod slides inside the first supporting rod, and the second supporting rod supports the correcting device body, so that the correcting device body is always attached to a human body.

In a further embodiment, the inside of second bracing piece is offered and is used for installing connecting device's spout, one side that correcting unit body and connecting device contacted rotates and installs the axis of rotation, connecting device is including rotating cap and push rod, the both sides fixed mounting who rotates the cap has the sliding block, the sliding tray with sliding block assorted is offered to the spout both sides, the inside pivoted groove that is used for sliding block pivoted that has been offered of sliding tray, the sliding block just slides in the pivoted groove when rotating cap and axis of rotation laminating mutually, one side fixed mounting that correcting unit body was kept away from to the cap that rotates has the push rod, the other end of push rod runs through the second bracing piece lateral wall, and artifical stirring push rod rotates the cap slip and is in the same place with rotation axis connection.

In a further embodiment, the inner side wall of the rotating cap is fixedly provided with a plurality of clamping blocks, the outer side wall of the rotating shaft is provided with clamping grooves matched with the clamping blocks, and the clamping blocks and the clamping grooves are all provided with six.

In a further embodiment, the outer surface of the chair back is provided with a placing groove for installing the correcting device body, the correcting device body comprises a rotating rod, two supporting frames and a U-shaped baffle, the rotating rod is rotatably installed in the placing groove, the outer surface of the rotating rod is fixedly provided with symmetrically arranged supporting frames, the outer side walls of the two supporting frames are rotatably connected with a rotating shaft, and an adjustable U-shaped baffle is slidably installed between the two supporting frames.

In further embodiments, the slide rail that is used for installing U type baffle has been seted up to the inner wall of support frame, the spacing groove has been seted up to the both sides that U type baffle contacted with the support frame, spacing inslot slidable mounting has the fixture block, the fixture block slides in the inside of spacing groove all the time, a plurality of draw-in grooves with fixture block assorted have been seted up to the bottom of slide rail, fixture block and draw-in groove all set up to the rectangle, the back of the chair inside wall is provided with the constraint area, and the manual work stirs the fixture block and slides in the spacing groove, controls the distance between U type baffle and the back of the chair.

In a further embodiment, the chair legs are rotatably mounted on two sides of the bottom of the chair seat, symmetrically arranged sliding seats are slidably mounted on the bottom of the chair seat, connecting rods are rotatably mounted on the bottoms of the sliding seats, the other ends of the connecting rods are rotatably connected with the inner side walls of the chair legs, and the two connecting rods are in X-shaped staggered distribution.

In a further embodiment, a folding groove is formed in the bottom of the seat, a threaded rod is rotatably mounted in the folding groove, the outer surface of the threaded rod is meshed with the sliding seat, threads which are symmetrical and opposite in direction are formed in the outer surface of the threaded rod, one end of the threaded rod penetrates through the outer side wall of the seat to be fixedly provided with a rotary table, the outer surfaces of the legs are just flush with the bottom of the seat when the two sliding seats are farthest away, a rectangular groove for mounting the legs is formed in the bottom of the inner side wall of the folding groove, and the rotary table drives the connecting rod to rotate so that the connecting rod drives the seat to rotate.

Compared with the prior art, the invention has the beneficial effects that:

the invention discloses a sitting posture correcting device, which is characterized in that a human body is connected with a chair back, when students need to bend down to write, the chair back is driven to rotate, and the correcting device body is supported by a supporting device at the moment, so that the correcting device body is always in a horizontal state, is always attached to the human body and corrects the human body, thereby achieving the purpose of good correcting effect, and solving the problems that the existing correcting device in the prior art is poor in correcting effect and cannot be installed on the chair.

Drawings

FIG. 1 is a schematic diagram of an embodiment of the present invention;

FIG. 2 is a top cross-sectional view of an embodiment of the present invention at a connection device;

FIG. 3 is a side cross-sectional view of an embodiment of the present invention at a sliding channel and a rotating channel;

FIG. 4 is a partial cross-sectional view of a connection between a support bracket and a U-shaped baffle according to an embodiment of the present invention;

FIG. 5 is a side cross-sectional view of a seat and legs of an embodiment of the present invention;

figure 6 is a side cross-sectional view of a chair leg according to the present invention after retraction.

In the figure: 1. a seat; 2. chair legs; 3. a chair back; 31. a placement groove; 32. a bump; 4. a support device; 41. a first support bar; 42. a second support bar; 421. a chute; 422. a sliding groove; 423. a rotating groove; 5. a correction device body; 51. a rotating lever; 52. a support frame; 521. a slide rail; 522. a clamping groove; 523. a rotating shaft; 524. a clamping groove; 53. a U-shaped baffle; 531. a limit groove; 6. a clamping block; 7. a groove; 8. a connecting device; 81. a push rod; 82. rotating the cap; 821. a sliding block; 822. a clamping block; 9. a sliding seat; 10. a threaded rod; 11. a connecting rod; 12. a turntable; 13. a folding groove; 131. rectangular grooves.

Detailed Description

In the following description, numerous specific details are set forth in order to provide a more thorough understanding of the present invention. It will be apparent, however, to one skilled in the art that the invention may be practiced without one or more of these details. In other instances, well-known features have not been described in detail in order to avoid obscuring the invention.

Example 1

Referring to fig. 1, the present embodiment provides a sitting posture correction device, which includes a seat 1, legs 2 and a backrest 3, wherein a groove 7 is provided on the upper surface of the seat 1, the groove 7 is provided in a rectangular shape with a top and one side open, and the backrest 3 is limited, so that the backrest 3 can only rotate from a vertical state to a horizontal state, and a phenomenon that a human body falls down due to excessive rotation does not occur.

The back of the chair 3 is installed in the rotation of recess 7 inside wall, the top rotation of back of the chair 3 installs correcting unit body 5, the cooperation of back of the chair 3 and correcting unit body 5 is used, press from both sides the human body between correcting unit body 5 and back of the chair 3, thereby accomplish the function to human correction, back of the chair 3 can follow the waist forward rotation of human body moreover, can not prevent the anteverted on human upper portion, keep the laminating with human back in addition to the end, can avoid out the crooked condition of waist, have better correcting effect, and has certain flexibility moreover, can not appear leaving the phenomenon that the clearance leads to correcting effect not good between back of the chair 3 and the human back.

The support device 4 which enables the correction device body 5 to be always in the horizontal direction is arranged on the outer side of the chair back 3, when the chair back 3 rotates, the support device 4 always supports the correction device body 5, the correction device body 5 can be prevented from extruding the shoulder of a human body, the comfort of use is improved, the correction device body 5 is always attached to the waist of the human body, and therefore the purpose of good correction effect is achieved.

The bottom of the seat 1 is rotatably provided with the retractable chair legs 2, and the chair legs 2 are stored in the seat 1, so that the chair is of a square structure, the purposes of convenient carrying and carrying are achieved, and the storage space can be saved during storage.

A protruding block 32 for installing the supporting device 4 is fixedly installed above one side of the chair back 3, which is contacted with the groove 7, and the protruding block 32 gives a pivot point for rotating the supporting device 4, so that the supporting device 4 rotates stably.

In order to maintain the leveling state of the correction device body 5, to prevent the correction device body 5 from causing a pressure load on the shoulder of the human body, and to further enhance the correction effect, the support device 4 includes a first support bar 41 and a second support bar 42, the first support bar 41 is rotatably connected with the bump 32, and the second support bar 42 is slidably mounted inside the other end surface of the first support bar 41.

When the chair back 3 rotates, the correction device body 5 is driven to rotate, so that the correction device body 5 drives the second support rod 42 to slide in the first support rod 41, certain damping is arranged between the inner side wall of the first support rod 41 and the outer side wall of the second support rod 42, certain friction force exists between the first support rod 41 and the second support rod 42, the second support rod 42 is stopped at any position, a triangle is formed among the support device 4, the correction device body 5 and the chair back 3, the support function of the correction device body 5 is completed, the correction device body 5 is in a horizontal state and is tightly attached to a human body, and the purpose of good correction effect is achieved.

Referring to fig. 1-3 and 5-6, a slidable connecting device 8 is installed inside the side, which contacts the correction device body 5, of the other end of the second support rod 42, the connecting device 8 is rotatably connected with the outer side wall of the correction device body 5, the correction device body 5 and the support device 4 are connected together through the connecting device 8, and the support device 4 and the correction device body 5 are separated by sliding the connecting device 8 away from the correction device body 5, so that the space occupied between the support device 4 and the correction device body 5 is reduced and the purpose of convenient carrying is achieved by folding the support device 4 and the correction device body 5 in sequence. The chair legs 2 are folded at the moment, the chair can form a cuboid structure, the carrying and the placing are convenient, and the stacking of the chair is convenient when the chair is stacked, so that the space is saved.

The second bracing piece 42 after folding and the one side fixed mounting who contacts of seat support 1 have the grafting piece, and the spliced groove with grafting piece assorted is seted up to the top of seat support 1, and the cooperation in grafting piece and spliced groove is used, and is spacing to second bracing piece 42, prevents that second bracing piece 42 from sliding out from first bracing piece 41, avoids second bracing piece 42 to slide out the back and bump with the external world the phenomenon emergence, also has certain resistance between grafting piece and the spliced groove moreover for strutting arrangement 4 places more stably.

In order to facilitate the connection of the second support rod 42 and the correction device body 5 into a whole, the sliding groove 421 for installing the connection device 8 is formed in the second support rod 42, and the connection device 8 is placed in the sliding groove 421, so that space can be saved, and the connection device 8 slides more stably.

The rotating shaft 523 is rotatably arranged on one side, in contact with the connecting device 8, of the correcting device body 5, the connecting device 8 comprises a push rod 81 and a rotating cap 82, sliding blocks 821 are fixedly arranged on two sides of the rotating cap 82, sliding grooves 422 matched with the sliding blocks 821 are formed on two sides of the sliding grooves 421, and the sliding blocks 821 and the sliding grooves 422 limit the rotating cap 82, so that the rotating cap 82 slides along a given track.

The sliding groove 422 is internally provided with a rotating groove 423 for rotating the sliding block 821, the sliding block 821 just slides into the rotating groove 423 when the rotating cap 82 is attached to the rotating shaft 523, when the rotating shaft 523 drives the rotating cap 82 to rotate, the sliding block 821 and the rotating groove 423 are matched for use, the rotating cap 82 always slides in the sliding groove 421, the separation phenomenon can not occur, and the purpose of connecting the second support rod 42 and the correction device body 5 into a whole is achieved.

In order to facilitate control of the connection between the rotary cap 82 and the rotary shaft 523, a push rod 81 is fixedly mounted on the side of the rotary cap 82 away from the correction device body 5, the other end of the push rod 81 penetrates through the outer side wall of the second support rod 42, the push rod 81 is manually pushed, and the rotary cap 82 is slidably connected with the rotary shaft 523.

When the correction device body 5 and the second support rod 42 are required to be separated, only the push rod 81 is required to slide reversely, so that the separation of the correction device body 5 and the second support rod 42 is realized, the correction device body 5 and the support device 4 are disassembled into two parts, and after the correction device body 5 and the support device 4 are folded, the whole device is folded into a cuboid structure, the occupied space is saved, and the purpose of convenient carrying is achieved.

In order to make firm in connection between rotating cap 82 and rotation axis 523, the inside wall fixed mounting who rotates cap 82 has a plurality of joint piece 822, and rotation axis 523 lateral wall offered with joint piece 822 assorted joint groove 524, joint piece 822 and joint groove 524 all are provided with six, and the cooperation of joint piece 822 and joint groove 524 is used for rotating cap 82 and rotation axis 523 connection's more stable, the phenomenon that rotation axis 523 takes place the rotation in rotating cap 82 inside can not appear.

In order to carry chair legs 2 after the shrink of being convenient for, chair legs 2 are installed in the rotation of the bottom both sides of seat support 1, and the bottom slidable mounting of seat support 1 has the sliding seat 9 that the symmetry set up, and connecting rod 11 is installed in the equal rotation of bottom of sliding seat 9, and connecting rod 11's the other end is rotated with the inside wall of seat leg 2 and is connected, and when two sliding seats 9 were slided to the direction of keeping away from each other, drive connecting rod 11 and take place to rotate for connecting rod 11 drives chair leg 2 and takes place to rotate, thereby accomplishes the function of shrink.

The two connecting rods 11 are in X-shaped staggered distribution, so that the situation that the two connecting rods 11 are blocked due to collision during rotation is avoided.

The folding groove 13 has been seted up to the bottom of seat support 1, and folding groove 13 inside rotates installs threaded rod 10, and the surface and the sliding seat 9 meshing of threaded rod 10, and the surface of threaded rod 10 has been seted up symmetrical and opposite screw thread for two sliding seats 9 slide along opposite direction all the time, thereby make connecting rod 11 drive chair leg 2 shrink.

One end of the threaded rod 10 penetrates through the outer side wall of the seat 1 and is fixedly provided with a rotary disc 12, so that the sliding seat 9 can be controlled to slide better, and the chair legs 2 can be contracted conveniently.

The outer surface of the chair leg 2 just is parallel and level with the bottom of the chair seat 1 when two sliding seats 9 are furthest apart, a rectangular groove 131 for installing the chair leg 2 is formed in the bottom of the inner side wall of the folding groove 13, the rectangular groove 131 limits the chair leg 2, the chair leg 2 can only rotate to a vertical state, and the phenomenon that the chair leg 2 is deformed and damaged due to excessive rotation cannot occur.

In this embodiment, at first strutting arrangement 4 and correction device body 5 separation back, rotate back of the chair 3 again for back of the chair 3 falls into recess 7, contracts chair leg 2 at last, folds whole device together, has saved occupied space and has reached portable and transportation's purpose, the effectual convenience that has improved whole device.

At this time, the correction device body 5 is located at one side of the chair back 3 and is in a handle shape, so that the whole device is convenient to drag manually, and the portable effect is better.

Only shrink strutting arrangement 4, rotate back of the chair 3 again and go into recess 7 in, make the chair wholly become the stool and use this moment to correcting unit body 5 can rotate to with two chair legs 2 between, use as the baffle, prevent child with the foot inwards stretch out, lead to the injured condition of foot to take place.

At this time, the feet can be put on the correction device body 5 to be used as pedals, so that the pressure of the legs of a human body is relieved, and the application range is increased.

Embodiment 2, please refer to fig. 1 and 4, differs from embodiment 1 in that:

the standing groove 31 for installing the correcting device body 5 is formed in the outer surface of the chair back 3, and the standing groove 31 gives the rotating space of the correcting device body 5, so that the correcting device body 5 can be rotated conveniently and then corrected for a human body.

The correction device body 5 comprises a rotating rod 51, two supporting frames 52 and a U-shaped baffle 53, wherein the rotating rod 51 is rotatably arranged in the placing groove 31, the supporting frames 52 which are symmetrically arranged are fixedly arranged on the outer surface of the rotating rod 51, the supporting frames 52 support the U-shaped baffle 53, and the outer side walls of the two supporting frames 52 are rotatably connected with the rotating shaft 523.

The head of the human body can pass through the two supporting frames 52, the supporting frames 52 are just positioned on the upper sides of the shoulders of the human body, and the U-shaped baffle 53 is adjusted to be attached to the front chest of the human body, so that the correction device body 5 can be installed.

An adjustable U-shaped baffle 53 is slidably arranged between the two supporting frames 52, and is used for limiting a human body under the combined action of the chair back 3 and the U-shaped baffle 53 to prevent the human vertebra from inclining, so that the purpose of correction is achieved.

In order to be convenient for adjust the distance between U type baffle 53 and the back of the chair 3, the slide rail 521 that is used for installing U type baffle 53 has been seted up to the inner wall of support frame 52, and slide rail 521 is spacing to fixture block 6 for fixture block 6 only can the horizontal direction drive U type baffle 53 slide.

The spacing groove 531 has been seted up to the both sides that U type baffle 53 contacted with support frame 52, and spacing groove 531 inside slidable mounting has fixture block 6, and fixture block 6 slides in the inside of spacing groove 531 all the time, and spacing groove 531 and fixture block 6 all set up to the T type to guaranteed that fixture block 6 drives U type baffle 53 and slides.

The bottom of slide rail 521 has seted up a plurality of draw-in grooves 522 with fixture block 6 assorted, and the cooperation of fixture block 6 and draw-in groove 522 is used to make the fixed function to U type baffle 53, because draw-in groove 522 is provided with a plurality ofly, thereby can make U type baffle 53 fixed in different positions, reaches the purpose of adjusting the distance between U type baffle 53 and the back of the chair 3, thereby satisfies the human body of different sizes and corrects.

The fixture block 6 and the clamping groove 522 are all set to the rectangle, through the rectangle setting for the phenomenon that rocks about can not taking place after the U type baffle 53 is fixed, further improves the stability to the U type baffle 53 is fixed.

The inside wall of the chair back 3 is provided with a binding belt which binds the chest of the human body, thereby further improving the correction effect.

The correction device body 5 is not limited to the above-mentioned one, but can be replaced by a strap, such as a strap commonly used on a backpack and a strap buckle, so that the strap is lighter, and when the strap is used, the supporting device 4 is not needed at this time, so that the structure of the chair is reduced, and the chair is lighter.

Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims (4)

1. The utility model provides a position of sitting correcting unit, includes seat support (1), chair leg (2) and back of the chair (3), its characterized in that: the upper surface of the chair seat (1) is provided with a groove (7), the inner side wall of the groove (7) is rotatably provided with a chair back (3),

the chair comprises a chair back (3) and a groove (7), wherein a lug (32) for installing a supporting device (4) is fixedly arranged above one side, which is contacted with the groove (7), of the chair back (3), the supporting device (4) comprises a first supporting rod (41) and a second supporting rod (42), the first supporting rod (41) is rotationally connected with the lug (32), the second supporting rod (42) is slidingly arranged inside the other end surface of the first supporting rod (41), a certain damping is arranged between the inner side wall of the first supporting rod (41) and the outer side wall of the second supporting rod (42), a slidable connecting device (8) is arranged inside one side, which is contacted with a correcting device body (5), of the other end of the second supporting rod (42), the connecting device (8) is rotationally connected with the outer side wall of the correcting device body (5), and when the chair back (3) rotates, the second supporting rod (42) slides inside the first supporting rod (41), and the correcting device body (5) is always attached to a human body;

the inside of the second supporting rod (42) is provided with a sliding groove (421) for installing a connecting device (8), one side, in contact with the connecting device (8), of the correcting device body (5) is rotationally provided with a rotating shaft (523), the connecting device (8) comprises a push rod (81) and a rotating cap (82), two sides of the rotating cap (82) are fixedly provided with sliding blocks (821), two sides of the sliding groove (421) are provided with sliding grooves (422) matched with the sliding blocks (821), the inside of the sliding groove (422) is provided with a rotating groove (423) for rotating the sliding blocks (821), the sliding blocks (821) just slide into the rotating groove (423) when the rotating cap (82) is attached to the rotating shaft (523), one side, far away from the correcting device body (5), of the rotating cap (82) is fixedly provided with the push rod (81), the other end of the push rod (81) penetrates through the outer side wall of the second supporting rod (42), and the manual push rod (81) is connected with the rotating shaft (523) in a sliding mode;

the inner side wall of the rotating cap (82) is fixedly provided with a plurality of clamping blocks (822), and the outer side wall of the rotating shaft (523) is provided with clamping grooves (524) matched with the clamping blocks (822);

the chair comprises a chair back (3), wherein a placing groove (31) for installing a correction device body (5) is formed in the outer surface of the chair back (3), the correction device body (5) comprises a rotating rod (51), two supporting frames (52) and a U-shaped baffle (53), the rotating rod (51) is rotatably installed in the placing groove (31), symmetrically arranged supporting frames (52) are fixedly installed on the outer surface of the rotating rod (51), the outer side walls of the two supporting frames (52) are rotatably connected with a rotating shaft (523), and an adjustable U-shaped baffle (53) is slidably installed between the two supporting frames (52);

the sliding rail (521) for installing the U-shaped baffle (53) is arranged on the inner wall of the supporting frame (52), limit grooves (531) are formed in the two sides, which are in contact with the supporting frame (52), of the U-shaped baffle (53), clamping blocks (6) are slidably arranged in the limit grooves (531), the clamping blocks (6) always slide in the limit grooves (531), a plurality of clamping grooves (522) matched with the clamping blocks (6) are formed in the bottom of the sliding rail (521), the clamping blocks (6) and the clamping grooves (522) are rectangular, binding belts are arranged on the inner side wall of the chair back (3), the clamping blocks (6) are manually stirred to slide in the limit grooves (531), and the distance between the U-shaped baffle (53) and the chair back (3) is controlled;

the top of the chair back (3) is rotatably provided with a correction device body (5), the correction device body (5) is always in the horizontal direction by the support device (4), and the bottom of the chair seat (1) is rotatably provided with a retractable chair leg (2);

the human body is clamped between the correction device body (5) and the chair back (3), the chair back (3) can rotate forwards along with the waist of the human body, the flexibility is realized, the fit with the back of the human body is kept, and a gap is not reserved between the chair back (3) and the back of the human body;

when the supporting device (4) is contracted, the chair back (3) rotates into the groove (7), the whole chair is changed into a stool for use, the correcting device body (5) rotates between the two chair legs (2), and the correcting device body (5) is used as a foot baffle and a pedal.

2. A sitting posture correction apparatus according to claim 1, characterized in that: six clamping blocks (822) and six clamping grooves (524) are formed.

3. A sitting posture correction apparatus according to claim 1, characterized in that: the novel chair is characterized in that chair legs (2) are rotatably arranged on two sides of the bottom of the chair seat (1), symmetrically arranged sliding seats (9) are slidably arranged on the bottom of the chair seat (1), connecting rods (11) are rotatably arranged on the bottoms of the sliding seats (9), the other ends of the connecting rods (11) are rotatably connected with the inner side walls of the chair legs (2), and the two connecting rods (11) are in X-shaped staggered distribution.

4. A sitting posture correction apparatus according to claim 3, characterized in that: folding groove (13) have been seted up to the bottom of seat support (1), folding groove (13) inside rotates installs threaded rod (10), the surface and the sliding seat (9) meshing of threaded rod (10), symmetry and opposite screw thread have been seted up to the surface of threaded rod (10), the one end of threaded rod (10) runs through seat support (1) lateral wall fixed mounting and has carousel (12), two the surface of chair leg (2) just looks parallel and level with the bottom of seat support (1) when sliding seat (9) are furthest apart, rectangular groove (131) that are used for installing chair leg (2) have been seted up to folding groove (13) inside wall bottom, and rotating carousel (12) drive connecting rod (11) and take place to rotate for connecting rod (11) drive seat support (1) take place to rotate.