KR200466038Y1 - Variable shape chair by sitting posture - Google Patents

Abstract

Chairs that can be changed in shape according to the seating position according to the present invention are connected to both edges of the seat plate to move the backrest disposed at the upper side of the seat plate along both edges of the seat plate as described above. It includes a backrest moving unit to be mounted, and the inclination angle adjustment unit mounted to the lower side of the above-described seat plate so that the above-described seat plate can adjust the angle to be inclined downward or upward.

Description

Chair that can change shape according to sitting position {VARIABLE SHAPE CHAIR BY SITTING POSTURE}

The present invention relates to a chair that can be changed in shape according to a sitting posture, and more particularly, to a chair capable of changing a shape according to a sitting posture to provide an optimal learning environment to a user in response to various sitting postures. .

The general chair has a structure in which the backrest is provided at the rear side of the seat plate, so that the user can lean comfortably on the back while placing the lower body deeply to the rear side of the seat plate, but the upper body of the user faces the desk during learning or work. It will tilt.

Then, the user unconsciously moves the lower body to the front side of the seat to maintain the angle at which the legs and waist feel comfortable, whereby the user's thigh is inclined downward toward the ground.

Here, when the user maintains the posture as described above for a long time, the user is burdened on the lower back and lower body and cannot concentrate on learning or work for a long time, and the posture as described above is excessively loaded on the muscles and ligaments of the periphery along with the neck, spine and pelvis. Because it gives, it may act as a cause of musculoskeletal disorders.

The present invention devised to improve the above problems is to provide a chair that can be changed in shape according to the sitting posture to provide an optimal learning or work environment in response to various sitting postures for each user.

In addition, the present invention is to provide a chair capable of changing the shape according to the sitting position to correct the optimal posture to increase the concentration of learning or work to the user and to prevent musculoskeletal diseases in advance.

Chairs that can be changed in shape according to the seating position according to the present invention are connected to both edges of the seat plate to move the backrest disposed at the upper side of the seat plate along both edges of the seat plate as described above. It is a matter of course that a structure including a backrest moving unit to be mounted, and the inclination angle adjustment unit mounted on the lower side of the seat plate described above so that the above-described seat plate can be adjusted to be inclined downward or upward.

Here, the aforementioned backrest moving unit is mounted to both edges of the seat plate described above to guide the backrest to move along the front and rear of the seatboard described above, and is coupled to the above backrest and mounted to the above guide mechanism. It is preferable to apply a structure including a moving mechanism for reciprocating, and a coupling mechanism mounted on the above-described guide mechanism and the above-described moving mechanism and coupled to each other to reciprocate the above-described moving mechanism.

At this time, the length of the first leg provided on the rear side of the bottom of the seat plate is constant, and the length of the second leg provided on the front side of the bottom plate of the seat plate is stretched in conjunction with the aforementioned inclination angle adjusting unit. It is possible to apply a structure in which the angle of the front of the seat plate described above with respect to the rear is adjusted to be inclined downward or upward.

In addition, the length of each of the legs provided on the front and rear sides of the bottom of the seat plate described above is constant, and the aforementioned inclination angle adjusting unit uses the seat plate between the upper part of the above-mentioned leg and the seat plate on which the above-described backrest moving unit is mounted. It is also possible to apply a structure for adjusting the angle inclined upward or downward.

As described above, the chair capable of changing the shape according to the sitting position according to the present invention has the following advantages.

First, according to the present invention, the back of the chair is movable by the backrest moving unit along the front and rear of the seat plate, and the seat plate of the chair is different for each user according to the structure that is adjustable to be tilted up or down with respect to the ground by the tilt angle adjusting unit. By changing the shape corresponding to the sitting posture, it is possible to provide a comfortable learning or work environment.

Therefore, since the shape can be changed as described above, the user can finely adjust the position of the backrest and the inclination angle of the seat plate that are most suitable for him, thereby increasing the concentration of learning or work, as well as correcting the posture, and the musculoskeletal system. The disease can be prevented beforehand.

1 is a side conceptual view of a chair capable of changing a shape according to a sitting posture according to an embodiment of the present invention;
2 is a front conceptual view showing the structure of the backrest moving unit which is a main part of the present invention as viewed from the point A of FIG.
3 is a side conceptual view showing a structure of a backrest moving unit which is a main part of the present invention as viewed from the point B of FIG.
Figure 4 is a side conceptual view showing the structure of the inclination angle adjustment unit that is the main part of the chair capable of changing the shape according to the sitting position according to an embodiment of the present invention
5 is a side conceptual view showing another embodiment of an inclination angle adjusting unit which is a main part of the present invention showing the portion C of FIG.
Figure 6 is a side conceptual view showing the structure of a chair capable of changing the shape according to the sitting position according to another embodiment of the present invention
7 and 8 are a front conceptual view showing various embodiments of the rotary machine as a main part of the present invention as viewed from the point D of FIG.
Figure 9 is a simplified conceptual view of a state in which the seat plate of the chair that can be changed in shape according to another embodiment of the present invention the inclination is adjusted
10 is a conceptual diagram showing a state in which the curvature of the backrest which is the main part of the chair capable of changing the shape according to the sitting position according to another embodiment of the present invention is adjusted;
Figure 11 is a side conceptual view showing a state of use of the chair can be changed in shape according to the sitting position according to an embodiment of the present invention

Hereinafter, with reference to the accompanying drawings will be described a preferred embodiment of the present invention.

This is intended to be illustrative in nature to enable those skilled in the art to readily implement the invention, and this does not mean that the technical idea and scope of the invention is limited.

In addition, the size or shape of the components shown in the drawings may be exaggerated for clarity and convenience of description, terms specifically defined in consideration of the configuration and operation of the present invention will vary depending on the intention or custom of the user or operator The definitions of these terms should be made based on the contents throughout the specification.

1 is a side conceptual view of a chair capable of changing a shape according to a sitting posture according to an embodiment of the present invention.

According to an embodiment of the present invention, the chair having a shape changeable according to a sitting posture may be adjusted by the backrest moving unit 100, and the position of the backrest 400 may be adjusted by the inclination angle adjusting unit 200. It can be seen that the slope is adjustable structure.

In FIG. 1, reference numerals 530 and 540 denote support frames for vertically and horizontally connecting the first leg 510 and the second leg 520 under the seat plate 300.

For reference, before and to be defined later, the meaning of the rear is to define the front left and the right rear, respectively, which is applied to Figures 1, 4, 6 and 9 to 11, respectively.

The backrest moving unit 100 is connected to both side edges of the seat plate 300 as shown in order to move the backrest 400 disposed on the upper side of the seat plate 300 along both edges of the seat plate 300. 300 is mounted on both edges.

In addition, the inclination angle adjusting unit 200 is mounted on the lower side of the seat plate 300 so that the seat plate 300 can adjust the angle to be inclined downward or upward.

Therefore, the user moves the backrest 400 along the front and rear of the seat plate 300 properly using the backrest moving unit 100 as shown in FIG. 11, and moves the inclination of the seat plate 300 to the inclination angle adjusting unit 200. By appropriately adjusting by using the user without having to pull the whole chair in front of the desk 900 will be able to maintain the most comfortable posture and concentrate on learning or work.

The present invention can be applied by the embodiment as described above, will be described in more detail for the main part of the present invention for a more detailed description.

As described above, the backrest moving unit 100 allows the backrest 400 to be moved forward and backward on the seat plate 300. As shown in FIGS. 2 and 3, the guide mechanism 110 and the movement mechanism 120 and It can be seen that the structure including a coupling mechanism (130).

First, the guide mechanism 110 is mounted at both edges of the seat plate 300 to guide the backrest 400 to move along the front and rear of the seat plate 300, and the rail 112 and the closing block 114 are moved. Include.

In addition, the movement mechanism 120 is coupled to the backrest 400 and mounted on the guide mechanism 110 to reciprocate, and includes a movement block 122 and a support rod 124.

In addition, the coupling mechanism 130 is mounted on the guide mechanism 110 and the moving mechanism 120, respectively, and serves to reciprocate the moving mechanism 120 by mutual coupling, the rack gear 132 and the pinion 134 and Handle 136.

Here, the rail 112 of the guide mechanism 110 is provided with a movable space and is mounted along both edges of the seat plate 300, and the closing block 114 is mounted at both ends of the rail 112 to move the mechanism 120. It is to limit the movement of).

Then, the moving block 122 of the moving mechanism 120 is coupled to the guide mechanism 100 to reciprocate along the longitudinal direction of the guide mechanism 100, the support rod 124 is the backrest 400 and the moving block 122 It also serves to distribute and support the loads from the user's back by interconnecting them.

At this time, the rack gear 132 of the coupling mechanism 130 is formed in the longitudinal direction of the guide mechanism 100 (see Fig. 3), the pinion 134 is a moving mechanism 120, that is, a moving block The gear 122 is coupled to the rack gear 132 so as to be forward and reversely mounted on the 122.

In addition, the handle 136 is connected to the pinion 134 and rotates integrally with reference to the enlarged part of FIG. 2, and the handle 136 is not limited to the illustrated shape, and any shape is convenient for the user to grip and rotate. Of course.

And, the coupling mechanism 130 is not limited to the structure as described in the present invention, for example, through the rolling contact bearing on the structure such as the LM guide or the contact surface of the moving block 122 and the rail 112, etc. It is of course possible to design and modify the application of the.

In addition, the coupling mechanism 130 is screwed so as to be forward and reverse rotation with the moving mechanism 120, as shown in Figures 2 and 3, one end is in contact with the inner surface of the guide mechanism 110, that is, the rail 112 The movement of the moving block 122 is limited and the other end may further include a fixture 138 provided with a handle 137.

Meanwhile, as described above, the inclination angle adjusting unit 200 adjusts the inclination angle of the seat plate 300. Referring to FIG. 4, the second legs 520 may be provided with respect to the first legs 510 having a predetermined length. Implementations of the embodiments applied with the flexible structure are possible.

That is, the second leg 520 is provided on the front side of the bottom surface of the seat plate 300, and is provided on the rear side of the bottom surface of the seat plate 300 with respect to the first leg 510 for maintaining a constant length inclination angle adjustment unit 200 Stretching and interlocking with the structure that the angle of the front of the seat 300 is inclined downward or upward with respect to the rear of the seat plate 300, the frame 210 and the first, second hinges 220, 230 as shown ), And the expansion and contractor 240 and the fixture 250.

First, the frame 210 is mounted on the bottom surface of the seat plate 300, the first hinge 220 is rotatably connected between the frame 210 and the ends of the first leg 510, and the second hinge 230. ) Rotatably connects between the frame 210 and the end of the second leg 520.

In addition, the expansion and contraction 240 is connected to the second hinge 230 and the rod 242 to form an upper portion of the second leg 520, provided on the lower side of the rod 242, the rod 242 enters and exits It is a structure including a cylinder 244 is provided to form a lower portion of the second leg (520).

At this time, the fastener 250 is to penetrate the cylinder 244 to contact the outer surface of the rod 242 and limit the movement of the rod 242 to move up and down, the coupling with the cylinder 244 is by screw coupling or the like The movement of the rod 242 may be limited by contacting or spaced apart from the outer surface of the rod 242 via the spring.

In addition, the inclination angle adjusting unit 200 is a second leg 520 as shown in Figure 5 instead of the fastener 250 in the configuration of the frame 210, the first and second hinges 220 and 230 and the expansion and contraction 240 described above. It is possible to apply the embodiment including the hatch 260 mounted on the lifting rod 242 to lift the rod 242 from the cylinder 244 while forward and reverse rotation, the hatch 260 is a lifting rack 262 and the pinion 264 The structure including the lifting handle 266 and the lifting limit 268 can be applied.

That is, the lifting rack 262 of the lifting hole 260 is composed of a plurality of gears protruding on the outer surface of the rod 242 along the vertical length direction, the lifting pinion 264 is built in the cylinder 244 is a lifting rack ( 262) and gear coupling.

Here, the elevating handle 266 is connected to the elevating pinion 264 and protrudes outside the cylinder 244 to allow the user to elevate the rod 242 while being gripped and rotated forward and backward.

At this time, the lifting limit 268 is to penetrate the cylinder 244 to contact the outer surface of the rod 242 to limit the movement of the lifting rod 242, the fastener 250 shown in the embodiment of FIG. It is the same structure.

On the other hand, the inclination angle adjustment unit can be applied to the embodiment shown in Figure 6 in addition to the above-described structure.

That is, the inclination angle adjustment unit 600 is provided on the front and rear sides of the bottom surface of the seat plate 300, respectively, between the upper end of the leg 500 and the seat plate 300 on which the backrest moving unit 100 is mounted. It is possible to apply a structure for adjusting the angle of the 300 to be inclined upward or downward, and largely apply a structure including a lower frame 610 and an upper frame 620, the support rod 630 and the inclined forming hole 640. Can be.

That is, the lower frame 610 interconnects the upper end of the leg 500, and provides a space in which the supporting rod 630 and the inclined forming tool 640 to be described later are mounted, and the upper frame 620 is the seat plate 300. It is mounted on the bottom and provides a space in which the backrest moving unit 100 is mounted.

The support bar 630 protrudes from both sides of the lower frame 610 to be rotatably coupled to both edges of the upper frame 620 to support the load of the seat plate 300 and the backrest moving unit 100.

The inclined forming tool 640 is mounted between the lower frame 610 and the upper frame 620 so that the front and rear ends of the seat plate 300 are inclined upward or downward with respect to the support bar 630 while being rotated forward and backward. As a result, it can be seen that the first and second eccentric cams (642, 644), the interlock sprocket 646 and the rotating device (650).

The first eccentric cam 642 is mounted at the center of the first rotating shaft 641, the both ends of which are rotatably coupled to the support brackets 611 protruding from both edges of the rear of the lower frame 610, the seat plate 300 The member rotates integrally with the first rotation shaft 641 while in contact with the bottom surface.

The second eccentric cam 644 is mounted at the center of the second rotating shaft 643 rotatably coupled to both ends of the support bracket 613 protruding from both edges in front of the lower frame 610, the seat plate 300 It is a member which rotates integrally with the 2nd rotation shaft 643 while contacting a bottom face.

The interlocking sprocket 646 is mounted to the first and second rotation shafts 641 and 643, respectively, and is connected to the chain 645 so as to rotate together with the first and second eccentric cams 642 and 644.

In addition, the rotary device 650 is a member coupled to an end of the first rotary shaft 641 or the second rotary shaft 643 to rotate the first rotary shaft 641 or the second rotary shaft 643.

Here, the rotating device 650 extends from an end portion of the first rotating shaft 641 or the second rotating shaft 643 as shown in FIG. 7 to form a rotating piece orthogonal to the first rotating shaft 641 or the second rotating shaft 643. It can be manually operated using a handle 652 rotatably coupled to the end of 651.

In addition, the rotary device 650 may receive the driving force in addition to the manual operation as described above to rotate the first rotary shaft 641 or the second rotary shaft 643 by automatic operation, and the driving motor 653 as shown in FIG. 8. And a structure including a speed reducer 654 and a controller 655.

The driving motor 653 is coupled to the end of the first rotary shaft 641 or the second rotary shaft 643, and rotates forward and backward, and the reducer 654 is the end of the first rotary shaft 641 or the second rotary shaft 643. And a rotation speed of the driving motor 653 which is mounted between the driving motor 653 and rotates at a high speed, is decelerated at a speed suitable for adjusting the inclination of the seat plate 300.

The controller 655 is electrically connected to the driving motor 653, and is mounted on one side of the seat plate 300 to control forward and reverse rotation of the driving motor 653.

Accordingly, when the user rotates the first rotary shaft 641 or the second rotary shaft 643 by manual or automatic operation while sitting on the seat plate 300, the first and second eccentric cams 642 and 644 rotate and interlock with each other. As shown in (a) and (b), the inclination of the seat plate 300 may be adjusted to be inclined upward and downward with respect to the front of the seat plate 300, respectively.

To this end, the first and second eccentric cams 642 and 644 have a first rotation shaft 641 at one edge of the first eccentric cam 642 when the seat plate 300 and the lower frame 610 are parallel to each other. The distance d1 to) is preferably the same as the distance d2 from the other edge of the second eccentric cam 644 to the second rotation axis 643.

Accordingly, the first and second eccentric cams 642 and 644 rotate forward and reverse in one direction by the interlocking sprocket 646 interconnected by the chain 645 and rotate the first and second rotation shafts 641 and 643 as shown in FIG. 9. It is possible to make an inclined operation with respect to the imaginary line shown by the dotted line which interconnects.

On the other hand, the backrest 100 preferably further includes a posture correcting unit 700 which allows the deformation to be in close contact with the user's back while protruding according to the user's body shape, as shown in Figure 10, and largely the deformation plate 710, It can be seen that the structure includes a rack gear 720 consisting of one and two rack gear rods 722 and 724, a deformation pinion 730, and a deformation handle 740.

That is, the deformation plate 710 of the posture correcting unit 700 is provided with mounting pieces 713 facing each other along the edges of the upper and lower ends thereof in parallel, and the upper and lower ends of the mounting pieces 713 are proximate to each other. It adopts a flat plate shape that allows elastic deformation while bending in accordance with the force applied from, for example, to be made of a material having excellent resilience while allowing elastic deformation.

The rack gear 720 performs an ascending and descending operation simultaneously as shown in FIGS. 10A and 10B while interlocking with the elastic deformation due to the bending of the deformation plate 710. The first and second rack gear rods 722, 724).

The first rack gear rod 722 is mounted to the mounting piece 713 of the upper end, the end is toward the mounting piece 713 'of the lower end and a plurality of gear teeth are formed along the longitudinal direction, the second rack gear rod 724 is It is mounted to the mounting piece 713 ′ of the lower end, and the end thereof faces the mounting piece 713 of the upper end, and a plurality of gears are formed along the longitudinal direction to face the gear teeth of the first rack gear rod 722.

The deformed pinion 730 is geared to the gears of the first and second rack gear rods 722 and 724 at the same time to forward and reverse rotation. The deformable handle 740 extends from the center of the deformed pinion 730 to support the backrest 400. It is mounted on the outside of the deformation pinion 730 by the linkage of the deformation plate 710 is to be forward, reverse rotation.

Deformation handle 740 is shown in the figure is mounted on one side edge of the backrest 400 in the shape that the user can operate from the side, but is not limited to this, of the pinion 730 coupled with the rack gear 720 Various applications and modifications are possible, such as being mounted at the rear of the backrest 400 and operating according to the direction in which the center is disposed.

Accordingly, when the user grips the deformable handle 740 to forward and reverse rotation, the deformation pinion 730 is interlocked. Accordingly, the first and second rack gear rods 722 and 724 simultaneously raise and lower.

At the same time, the deforming plate 710 is guided along the rails 711 built on both sides of the backrest 400, the moving projections 712 protruding on both sides of the upper and lower portions, respectively, (a) and (b) of FIG. As such, it may be modified to be in close contact with the user's body shape, that is, the back.

As described above, the present invention can provide an optimal learning or work environment in response to various sitting postures for each user, and improve the concentration of learning or work to the user and correct the optimal posture to prevent musculoskeletal diseases in advance. It can be seen that the basic technical idea is to provide a chair whose shape can be changed according to a sitting posture.

Although embodiments according to the present invention have been described above, these are merely exemplary, and it will be understood by those skilled in the art that various modifications and equivalent ranges of the embodiments are possible.

Therefore, the true technical protection scope of the present invention should be defined by the following claims.

100 ... Back movement unit 110 ... Information unit
112.Rail 114 ... Finish Block
120 ... move 122 ... move block
124 support rod 130 coupling mechanism
132 Rackgear 134 Pinion
136, 137 ... Handle 138 ... Fixed
200, 600 ... Slope angle adjustment unit 210 ... Frame
220 ... 1st hinge 230 ... 2nd hinge
240 ... New football 242 ... Rod
244 Cylinder 250 Fixture
260 Hatch 262 Hatch Rack
264 Lift pin 266 Handle
268 Lift limit 300 Seat
400 ... back 500 ... leg
510 ... First Leg 520 ... Second Leg
530, 540 Support frame 610 Lower frame
611, 613 Support bracket 620 Upper frame
630 ... support rod 640
641 ... 1st axis of rotation 642 ... 1st eccentric cam
643.2nd axis of rotation 644 ... 2nd eccentric cam
645 Chain 646 Interlocking Sprockets
650 rotating machines 651
652 Handle 653 Drive Motor
654 Reducer 655 Controller
700 ...
900 ... desk

Claims (9)

It is connected to both edges of the seat plate 300 is mounted on both sides of the seat plate 300 to move the backrest 400 disposed on the upper side of the seat plate 300 along both edges of the seat plate 300 Backrest moving unit 100;
An inclination angle adjusting unit (200, 600) mounted on a lower side of the seat plate (300) such that the seat plate (300) can be adjusted downward or upwardly inclined; And
A chair capable of changing a shape according to a sitting posture, including; a posture correcting unit 700 mounted on the backrest 400 and protruding according to a user's body shape to be in close contact with a user's back.
The method of claim 1,
The backrest moving unit,
Guide mechanisms mounted at both edges of the seat plate to guide the backrest to move along the front and the rear of the seat plate;
A moving mechanism coupled to the backrest and mounted on the guide mechanism for reciprocating;
And a coupling mechanism mounted on the guide mechanism and the movement mechanism and coupled to each other to reciprocate the movement mechanism.
The method of claim 1,
The inclination angle adjusting unit,
A frame mounted to the bottom of the seat plate;
A first hinge for rotatably connecting the end of the first leg provided on the rear side of the bottom of the seat plate and the frame;
A second hinge for rotatably connecting the end of the second leg provided on the front side of the bottom of the seat plate and the frame;
An expansion and contraction device including a rod connected to the second hinge and forming an upper portion of the second leg, and a cylinder provided at a lower side of the rod and having a space through which the rod enters and forms a lower portion of the second leg; Wow,
A fastener penetrating the cylinder to contact the outer surface of the rod and limit the movement of the rod to move up and down,
The length of the first leg is constant with respect to the stretching second leg,
Chair according to the sitting position of the angle is adjusted so that the front of the seat is inclined downward or upward with respect to the rear of the seat.
The method of claim 1,
The inclination angle adjusting unit,
A frame mounted to the bottom of the seat plate;
A first hinge for rotatably connecting the end of the first leg provided on the rear side of the bottom of the seat plate and the frame;
A second hinge for rotatably connecting the end of the second leg provided on the front side of the bottom of the seat plate and the frame;
An expansion and contraction device including a rod connected to the second hinge and forming an upper portion of the second leg, and a cylinder provided at a lower side of the rod and having a space through which the rod enters and forms a lower portion of the second leg; Wow,
A lifting hole mounted on the second leg to lift the rod from the cylinder while rotating forward and reverse,
The length of the first leg is constant with respect to the stretching second leg,
Chair according to the sitting position of the angle is adjusted so that the front of the seat is inclined downward or upward with respect to the rear of the seat.
The method of claim 4, wherein
The hatch is,
A lifting rack consisting of a plurality of gears protruding from the outer surface of the rod along a vertical length direction;
An elevating pinion built into the cylinder and gear-engaged with the elevating rack;
A lifting handle connected to the lifting pinion and protruding outside the cylinder to forward and reverse rotation;
A chair that can be changed in shape according to a sitting posture including a lift limiting hole penetrating the cylinder and in contact with the outer surface of the rod to limit the movement of the rod.
The method of claim 1,
The inclination angle adjusting unit,
A lower frame interconnecting the upper ends of the legs provided on the front and rear sides of the bottom of the seat plate;
An upper frame mounted on the bottom surface of the seat plate, to which the backrest moving unit is mounted;
A support rod protruding from both sides of the lower frame and rotatably coupled to both edges of the upper frame;
A chair capable of changing the shape according to a sitting posture, which is mounted between the upper and lower frames, and includes an inclination forming tool configured to make the front and rear ends of the seat plate incline upward or downward with respect to the support rod while being rotated forward and backward.
The method according to claim 6,
The inclined forming tool,
A first eccentric cam mounted at the center of the first rotation shaft rotatably coupled to both ends of the support brackets protruding from both edges of the rear frame, the first eccentric cam integrally rotating with the first rotation shaft while being in contact with the bottom surface of the seat plate;
A second eccentric cam mounted at the center of a second rotation shaft rotatably coupled to both ends of the support bracket protruding from both edges in front of the lower frame, the second eccentric cam integrally rotating with the second rotation shaft while contacting a bottom surface of the seat plate;
Interlocking sprockets mounted on the first and second rotation shafts, respectively, and connected to each other by a chain and rotate integrally with the first and second eccentric cams.
A rotary device coupled to an end of the first rotation shaft or the second rotation shaft to rotate the first rotation shaft or the second rotation shaft,
When the seat plate and the lower frame are parallel, the distance from one edge of the first eccentric cam to the first rotation axis is changed in shape according to a sitting posture such as the distance from the other edge of the second eccentric cam to the second rotation axis. 2 chairs available.
delete The method of claim 1,
The posture correction unit,
A deformation plate provided with parallel mounting surfaces facing each other along the edges of the upper and lower ends, wherein the mounting pieces are bent in close proximity to each other to allow elastic deformation while being bent according to the force applied from the upper and lower ends;
A first rack gear rod mounted to the mounting piece of the upper end, the end of which is directed to the mounting piece of the lower end and in which a plurality of gears are formed along the longitudinal direction;
A second rack gear rod mounted to the mounting piece of the lower end portion, the end of which is directed to the mounting piece of the upper end portion, and a plurality of gears are formed along the longitudinal direction to face the gear teeth of the first rack gear rod;
Deformed pinion which is geared to the gears of the first and second rack gear rods at the same time, forward and reverse rotation,
And a deformation handle extending from a center of the deformation pinion and mounted to the outside of the backrest, and including a deformation handle for forward and reverse rotation of the deformation plate to bend by linkage of the deformation pinion.

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