KR200424912Y1 - Chair including a seat and a supporter for lumbar which is independantly movable with supporter for back - Google Patents

Abstract

Disclosed is a chair comprising a seat plate and a backrest that move independently of the back plate. The present invention, the tiltable chair, comprising: a seat plate including a waist support for supporting a user's waist; A back plate including a blank portion into which the seat plate is inserted in a first posture of a user standing up; A seat plate support part for supporting the seat plate; And a leg supporting the seat plate support portion, wherein the seat plate and the seat plate support portion are connected through a sliding member, and the seat plate is slid to the front portion of the chair in a second posture in which the user leans back. It is characterized by protruding from. According to the present invention, when the user flips the back, the user feels support to the lumbar spine and does not feel the gap in the lumbar region, thereby increasing the convenience and providing the effect of posture correction.

Description

Chair including a seat and a supporter for lumbar which is independantly movable with supporter for back}

1 is a view showing a conventional chair.

2 and 3 are a perspective view and a side view showing a chair according to the first embodiment of the present invention.

4 is a view for explaining the effect of the first embodiment of the present invention.

5 and 6 illustrate modified embodiments of FIG. 3.

7 is a view showing a chair according to a second embodiment of the present invention.

8 is a diagram for explaining the effect of the second embodiment.

9 to 12 show modified embodiments of FIG. 7.

13 to 19 also show another embodiment of a chair according to the present invention.

The present invention relates to a chair, and more particularly, to a chair that provides support to the lumbar spine when the user leans back and does not feel a gap in the lumbar region, thereby improving convenience and giving a posture correction effect.

1 is a view showing a conventional chair.

In general, as shown in FIG. 1, the chair 10 is coupled to the back plate 10 and the seat plate 12 at a predetermined angle, and the back plate 10 and the seat plate 12 are connected to each other by an elastic member 11. When the user is stepping back or in order to make the posture comfortable, the back plate 10 is tilted backward.

However, when the user stretches or the like, the lower body is often pushed forward to maintain the center of gravity of the chair, and in this case, a gap d between the lumbar region and the back plate is generated. Because of these gaps, the lumbar spine is not supported by gravity, which results in an unstable state and adversely affects the waist.

In addition, in the case of the conventional tiltable chair, when the user leans back, the center of gravity is moved to the rear part of the chair, and as a result, the user's legs are additionally applied by the user's tilted back to cause deformation of the chair. There is a problem.

Accordingly, the present invention has been made to solve the above problems, to provide a chair that improves the convenience and posture correction by removing the gap between the lumbar spine and the back when the user wets the back for stretching, etc. do.

The biggest feature of the present invention is to provide a seat plate and a waist support attached to it independently of the back plate. This lumbar support effectively supports the lumbar region when the user leans back. Such a chair is a tiltable chair,

A seat plate including a waist support for supporting a waist of a user;

A back plate including a blank portion into which the seat plate is inserted in a first posture of a user standing up;

A seat plate support part for supporting the seat plate; And

It includes a leg for supporting the seat plate support,

The seat plate and the seat plate support part may be connected to each other through a sliding member, and the waist plate may protrude from the space part by sliding the seat plate toward the front part of the chair in a second posture in which the user leans back.

The seat plate support may be inclined such that the front end portion is raised.

The lower back portion forms an angle of 75 to 105 with the seat plate, and preferably may form an angle of substantially 90 degrees.

Further comprising a hinge portion for connecting the seat plate and the seat plate support,

The hinge portion may facilitate sliding of the seat plate support portion and limit the sliding range.

The hinge portion,

A first hinge that is a rotation axis positioned on the seat plate;

A second hinge positioned on the seat plate support; And

It may include a hinge connecting member rotatably connected to the first hinge and the second hinge.

Further comprising an auxiliary seat plate rotatably connected to the front end of the seat plate,

The auxiliary seat plate may be to guide the user's ham, the thigh, or the upper part of the calf according to the user's posture.

The waistrest may be tiltable at an angle independent of the back plate by being formed of an elastic member.

The lumbar support may be formed in an uneven shape corresponding to the surface shape of the lumbar spine.

In the tiltable chair,

A seat plate including a waist support for supporting a waist of a user;

A back plate including a blank portion into which the seat plate is inserted in a first posture of a user standing up;

A side plate connected to the back plate and having front ends connected to both sides of the seat plate through hinge members;

A bridge connected to the side plate to support the side plate; And

A seat plate stopping part fixed to the leg to support the seat plate,

The seat plate and the side plate are rotatably connected through the hinge member at their respective front end portions, so that the rear end portion of the seat plate is lowered to the lower portion of the chair in a second posture where the user leans back, and the waist support portion is empty. It may be protruding from the portion.

The seat stop portion may be adjustable in height by the user's selection.

The lower back portion forms an angle of 75 to 105 degrees with the seat plate, and preferably may form an angle of substantially 90 degrees.

The hinge member,

A first hinge that is a rotation axis positioned on the seat plate;

A second hinge which is a rotating shaft positioned on the side plate; And

It may include a hinge connecting member rotatably connected to the first hinge and the second hinge.

The hinge member may include an elastic member with respect to the rotation direction therein.

Further comprising: an auxiliary seat plate rotatably connected to the front end of the seat plate,

The auxiliary seat plate may be to guide the user's ham, the thigh, or the upper part of the calf according to the user's posture.

The waistrest may be tiltable at an angle independent of the back plate by being formed of an elastic member.

The lumbar support may be formed in an uneven shape corresponding to the surface shape of the lumbar spine.

The back plate further includes a neck rest in the neck rest recess embedded therein, wherein the neck rest recess is connected to the seat through one or more transfer coupling members coupled to the bottom, and the neck rest is vertically folded as the seat rests. It may be movable.

 The back plate may be fixable at two or more angles in the second posture.

The waistrest may be one that can adjust the height.

The seat plate is divided into two parts, the whole and the rear part, and the rear part is formed with a waist supporting part supporting the user's waist, and the rear part is connected with the side part and the hinge, and the whole part is also connected by the hinge and one side is not connected by the hinge. The small face is coupled to the lower surface of the front and rear facing each other, and the upper and rear portions may be lifted upwards while facing the operation of the small.

All of the chairs described here were able to support the lumbar spine of the lower back, and even if the posture was changed in the chair, the lumbar spine was continuously supported so that the waist was protected from excessive strain. The chair disclosed above protects the lower back so that only the lumbar spine can be supported even when everyone is in a bad posture, such as back to back or hips forward.

Specifically, the present invention for solving the above problems, in the tiltable chair, the seat plate including a waist support for supporting the user's waist; A back plate including a blank portion into which the seat plate is inserted in a first posture of a user standing up; A seat plate support part for supporting the seat plate; And a leg supporting the seat plate support part, wherein the seat plate and the seat plate support part are connected through a sliding member, and the seat plate slides to the front part of the chair in a second posture in which the user leans back. Characterized in that the chair is characterized by protruding from.

In one embodiment, the subject innovation is characterized in that the seat plate support is inclined so that the front end portion is raised.

In one embodiment, the present invention further comprises a hinge portion connecting the seat plate and the seat plate support portion, wherein the hinge portion is characterized in that the sliding plate to facilitate the sliding and at the same time limit the sliding range.

In one embodiment, the present invention further comprises an auxiliary seat plate rotatably connected to the front end of the seat plate, the auxiliary seat plate, characterized in that guides the user's hamstring, thigh back or upper part of the calf according to the user's posture do.

In one embodiment, the present invention is characterized in that the waist support is formed of an elastic member, it is possible to tilt at an angle independent of the back plate.

In addition, the present invention, in the tiltable chair, the seat plate including a waist support for supporting the waist of the user; A back plate including a blank portion into which the seat plate is inserted in a first posture of a user standing up; A side plate connected to the back plate and having front ends connected to both sides of the seat plate through hinge members; A bridge connected to the side plate to support the side plate; And a seat plate stopping part fixed to the leg to support the seat plate.

The seat plate and the side plate are rotatably connected through the hinge member at their respective front end portions, so that the rear end portion of the seat plate is lowered to the lower portion of the chair in a second posture where the user leans back, and the waist support portion is empty. It protrudes from a part, It is characterized by the above-mentioned.

In one embodiment, the seat plate stop is characterized in that the height is adjustable by the user's selection.

In one embodiment, the hinge member is characterized in that it comprises an elastic member with respect to the rotation direction therein.

In one embodiment, the present invention further comprises an auxiliary seat rotatably connected to the front end of the seat plate, the auxiliary seat plate, characterized in that the user's posture, thigh back or calf upper part guide according to the user's posture It is done.

The back plate further includes a neck rest in the neck rest recess recessed inward, wherein the neck rest recess is connected to the seat through one or more wires coupled to the bottom, and the neck rest moves up and down as the seat rests. It may be possible.

The back plate may be fixable at two or more angles in the second posture.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

2 and 3 are a perspective view and a side view showing a chair according to the first embodiment of the present invention.

The chair 20 according to the present invention includes a back plate 21, a connection member 22, a seat plate support 23, a seat plate 24, a waist support 25 and a leg 27.

The back plate 21 is connected at a predetermined angle through the seat plate support 23 and the connecting member 22. In one embodiment, the connecting member 22 is made of an elastic member. Due to this, the back plate 21 is tiltable when the user flips back the back plate. In the center portion of the back plate 21, a blank portion 26 is formed. The space 26 is an empty space into which the waistrest 25 is inserted, and thus has a shape and size corresponding to the shape of the waistrest. The lumbar support serves to support the lumbar spine, but the position of the lumbar spine can vary because of the height, sitting height, etc., depending on the person. For this purpose, it is not excluded to be able to change the position of the lumbar support.

The seat plate 24 is disposed on the seat plate support 23, and is slidably connected to the seat plate support 23 via the sliding member 28. The sliding direction is a direction in which the user extends the back of the back for stretching or the like.

The seat plate supporting part 23 supports the seat plate and is connected to the back plate 21 through the connecting member 22, and a leg 27 is connected to the bottom plate 21. The load of the user is supported in the order of the seat plate 24-> the seat plate support part 23-> the leg 27.

As shown in FIG. 3, in one embodiment, the seat plate support 23 is inclined such that the front surface of the seat plate support 23 is higher than the rear face. In a preferred embodiment, the angle of inclination a is between 0 degrees and 10 degrees, which is an angle that makes the user feel more comfortable by raising the legs slightly when the user leans back without feeling discomfort when the user sits upright. .

The lumbar support 25 is connected at a predetermined angle at the rear of the seat plate 24. Here, the predetermined angle is an angle suitable for supporting the lumbar spine, about 75 to 105 degrees, and 90 degrees in a preferred embodiment. This angle is different depending on the height, sitting height, waist length of each person, but a certain amount of allowance, but it is preferable to support the lumbar spine at an angle of about 90 degrees. The lumbar support 25 is inserted into the blank 26 when the seat plate 24 moves to the rear of the chair by sliding.

4 is a view for explaining the effect of the first embodiment of the present invention.

The left figure of Fig. 4 shows a state in which the user stands up to work (first posture), and the right figure shows a state of the user leaning back to rest (second posture).

In the user's back position, the seat plate 24 is located at the rear portion of the chair, and the waistrest portion 25 is inserted into the blank portion 26 of the back plate 21. In the posture where the user leans back, the seat plate 24 is slid and moved to the front part of the chair to protrude, whereby the lumbar spine of the user is supported by the lumbar support 25. Compared with the user's tilted posture of FIG. 1, only the shoulder portion of the user is supported in FIG. 1, while the lumbar region of the user is also supported in FIG. 4. Therefore, the user can lean back more comfortably. Since the length to the lumbar spine varies from person to person, the waist support may be adjustable to support the lumbar spine well.

In addition, since the forward movement of the center of gravity caused by the seat plate 24 sliding to the front portion of the chair when the user leans back cancels the movement toward the back of the center of gravity generated by the user leaning back. Very little movement of the center of gravity line l occurs before and after the movement of the posture. Since the center of gravity rarely moves, it does not generate an unbalanced load on the legs of the chair, resulting in increased durability of the chair legs.

5 and 6 show modified embodiments of FIG. 3.

In FIG. 5, the seat plate 24 and the seat plate support 23 are connected by a hinge 54. The hinge portion 54 is composed of a first hinge 51, a second hinge 53 and a hinge connecting member 52. The hinge portion 54 guides the sliding of the seat plate 21 more easily, and limits the sliding range.

In FIG. 6, an auxiliary seat plate 61 is formed at the front end of the seat plate 24. The auxiliary seat plate 61 is rotatably connected to the seat plate via the seat plate hinge portion 62. The auxiliary seat plate 61 is almost vertically shaped at the front end of the seat plate when the user leans back and guides the upper and calf portions of the user's calf, and when the user stands up, the auxiliary seat plate 61 becomes almost horizontal. And by guiding the back of the thighs, to make the user feel more comfortable. The auxiliary seat adjusts the position of the user's leg by moving in conjunction with the movement of the seat, and can make the user's legs more stable by not falling off the ground. However, the auxiliary seat does not preclude moving the seat independently of the movement of the seat.

In addition, in one embodiment, the waistrest 25 may be formed of an elastic member. When the waistrest 25 is formed of an elastic member, the waistrest 25 is tiltable independently of the backrest 21 when the seat plate 24 is slid to the front part of the chair. That is, the waistrest 25 and the back plate 21 can be tilted at different angles, so that the user can take a more comfortable posture.

In addition, in one embodiment, the waistrest 25 may be formed in an uneven shape. Because of this, because the surface of the waist has a concave-convex shape due to the lumbar spine and muscle, it is possible to make the user's waist more comfortable when touching the waist support 25.

7 is a view showing a chair according to a second embodiment of the present invention.

Chair 70 according to the present invention includes a back plate 71, the connection member 72, the side plate 73, the seat plate 74, the waist support portion 75 and the leg 77.

The back plate 71 is connected at a predetermined angle through the side plate 73 and the connecting member 72. In one embodiment, the connecting member 72 is made of an elastic member. Due to this, the back plate 71 is tiltable when the user flips back the back plate. In the center portion of the back plate 71, a blank portion 76 is formed. The space portion 76 is an empty space into which the waist support portion 75 is inserted, and thus has a shape and size corresponding to the shape of the waist support portion.

The seat plate 74 is disposed at the center of the side plate 73, and is rotatably connected to the hinge plate 78 in the vertical direction with respect to the side plate 23 via the hinge member 78.

The side plate 73 is disposed on both sides of the seat plate 74 to support the seat plate 74, and is connected to the back plate 71 through the connecting member 72, and a leg 77 is connected to the lower plate 71. In addition, the front end portion of the side plate 73 is connected to the seat plate 74 through the hinge member 78, the front end portion of the side plate serves as a support point of the force of the rotation of the seat plate 74.

In one embodiment, the interior of the hinge member 78 may be additionally mounted with an elastic member such as a spring with respect to the direction of rotation thereof to have a repulsive force against the user's load on the seat plate (74).

The seat plate stopping part 79 is installed on the leg 77 and serves to stop the vertical movement of the seat plate 74. The seat plate stopping part 79 is movable up and down along the leg 77 and is fixed at a specific position on the leg 77 according to the user's selection. The uppermost position of the seat plate stopping part 79 is such that the seat plate 74 and the side plate 73 are at the same height.

8 is a diagram for explaining the effect of the second embodiment.

The left figure of FIG. 8 shows a state in which the user stands up to work (first posture), and the right figure shows a state of the user leaning back to rest (second posture).

In the posture in which the user is standing, the position of the seat plate stopping part 79 is fixed so that the seat plate 74 and the side plate 73 are located at the same height. The seat plate stopping portion 79 is located at the top of the leg 77, and the waist support portion 75 is inserted into the blank portion 76 of the back plate 71.

In a posture where the user leans back, the seat plate stopping portion 79 is moved downward and fixed by a predetermined height by the user's selection, and the seat plate 74 is lowered based on the hinge member 78 by the load of the user. Rotate to As a result, as shown in the right figure of Figure 8, the hip portion of the user is located at a height lower than the side plate (73). In addition, since the back plate 71 is flipped backward, the waistrest portion 75 escapes from the space portion 76 and protrudes forward than the back plate 71.

Since the lumbar support 75 protrudes more than the back plate 71, the lumbar spine of the user is supported by the lumbar support 75, and the seat plate 74 is rotated downward through the hinge member 78 to seat the seat plate 74. ) Is located below the side plate 73, so the angle of the hip and lumbar region is maintained at 90 degrees even when the user leans back. Preferably it is 90 degrees, but due to the height of the person, the length to the lumbar region, etc. When you do 75-105 is not a big problem. Compared with the user's tilted posture of FIG. 1, only the shoulder portion of the user is supported in FIG. 1, while the user's lumbar region is also supported in FIG. 4, and the angle of the lumbar region is 90 degrees. Thus, the user can lean back more comfortably.

9 and 10 show modified embodiments of FIG. 7.

In FIG. 9, the seat plate 74 and the side plate 73 are connected by the hinge portion 94. The hinge portion 94 is composed of a first hinge 91, a second hinge 93 and a hinge connecting member 92. The hinge portion 94 guides the shankdong of the seat plate 74 more easily, while slightly lifting the user's recessed portion to provide a more comfortable posture when the user leans back.

In FIG. 10, the auxiliary seat plate 101 is formed at the front end of the seat plate 74. The auxiliary seat plate 101 is rotatably connected to the seat plate via the seat plate hinge portion 102. As in the case of the embodiment of FIG. 6, the auxiliary seat 101 guides the upper part of the calf, the calf or the thigh of the user according to the user's posture, thereby making the user feel more comfortable.

In addition, as in the embodiment of Figures 5 and 6, the waist support portion 75 may be formed of an elastic member. It can be formed into an uneven shape.

Figure 11 shows the movement of the seat and back in the chair according to this article. The seat plate is folded downward when seated, but can be fixed in more than one position by the seat plate stop. The backs may also have two or three positions where the backs are fixed when the backs are lifted. To this end, the hinge is placed on the back plate and two or three locking jaws are placed on the hinge to be fixed at a predetermined position when the back plate is tilted backwards.

12 and 13 illustrate a chair further including a neck support. To be comfortable, the neck must also be comfortable. For this purpose, the neck rest must also be lowered as the seating position is lowered as much as the seat plate is lowered. To this end, a transfer coupling member such as a wire is coupled to the lower portion of the neck support and connected to the seat plate through a hole formed in the back of the back plate. Therefore, when the seat plate moves downward, it moves downward to the neckrest. The transfer coupling member may be a wire or a rod that is hard to bend, as well as a wire.

FIG. 14 is a view showing a view of the drawings of FIGS. 12 and 13 seen from below. FIG. 11 adjusts the angle by using a hinge, but in the chair of FIG. 14, the back plate is connected using an elastic member rather than a hinge, and the backrest part is also connected using an elastic member. The back plate was pushed back when the back plate was pushed by using the side plate and the back plate as the elastic member. However, when only the elastic member is used, it is difficult to adjust the angle of the back plate, so the apparatus for adjusting the angle of the back plate is described below. The lumbar support may also be rearwarded by the pressure applied to the lumbar support by engaging with the elastic member.

15 is a view showing another embodiment of a chair according to the present invention. The chair shown in the drawings is to be able to adjust the degree of the back part when the back back when the back part is not achievable by simple elasticity but rather by the elasticity. This is a well-known technique because it does not differ greatly from the apparatus used to adjust the height of the back, adjust the stop of the back angle or adjust the elasticity of the back according to the weight of the user in the existing chair. However, as shown in the drawings, the inclination of the back of the chair can be adjusted on both sides of the chair.

In addition, the backrest and the side plate are not coupled by a simple elastic member, respectively, so that it can be adjusted by the tilt adjusting device. In particular, the lumbar support itself can be moved up and down because the position of the lumbar spine varies depending on the person so that the lumbar support can be precisely supported, and the angle of the lumbar support itself can be adjusted separately and the elasticity can be adjusted.

16 to 19 show an embodiment of another chair according to the present invention. The chair shown in the drawing has a central portion of the seat plate divided up to rise up, and the front part of the seat plate is connected by a hinge to enable vertical movement, and the rear part of the seat plate rises upwards by about 90 degrees to form a lumbar support. It is hinged at the bottom of the lower back. Non-hinge parts face each other, and the lower back portion is moved backwards by lifting the opposite parts of the seat plate from the bottom. At this time, the back can also be moved backwards and the angle of the back can be adjusted separately regardless of the angle of the backrest.

18 and 19 show a configuration for enabling such an operation. On each side of the split of the seat is an arm that can lift both sides of the seat at once, and these two arms do not work independently and move together each time. This configuration is similar to that of a small vehicle for lifting a car.

So far I looked at the center of the preferred embodiment for the present invention. Those skilled in the art will appreciate that the present invention can be implemented in a modified form without departing from the essential features of the present invention. Therefore, the disclosed embodiments should be considered in descriptive sense only and not for purposes of limitation. The scope of the present invention is shown in the appended claims rather than the foregoing description, and all differences within the scope will be construed as being included in the present invention.

As described above, the present invention can remove the gap between the lumbar spine and the back when the user leans back for stretching, etc. by using the backrest moving independently of the back, thereby increasing convenience and providing posture correction.

In addition, the present invention can improve the durability of the chair legs by minimizing the movement of the center of gravity by sliding the seat plate forward when the user leans back.

Claims (20)

In the tiltable chair, A seat plate including a waist support for supporting a waist of a user; A back plate including a blank portion into which the seat plate is inserted in a first posture of a user standing up; A seat plate support part for supporting the seat plate; And It includes a leg for supporting the seat plate support, The seat plate and the seat plate support part are connected through a sliding member, and the seat plate slides to the front part of the chair in a second posture in which the user leans back, so that the lower back portion protrudes from the blank portion, independently of the back plate. A chair comprising a moving seat and a backrest. The method of claim 1, The seat plate support is characterized in that the front end is inclined so as to rise, the chair including a seat plate and a backrest moving independently from the back. The method of claim 1, The backrest portion of the chair comprises a seat plate and the backrest moving independently from the back, characterized in that the angle of the seat plate and 75 to 105 preferably form an angle of 90 degrees.  The method of claim 1, Further comprising a hinge portion for connecting the seat plate and the seat plate support, And the hinge portion facilitates sliding of the seat plate support and at the same time limits the sliding range. The method of claim 4, wherein The hinge portion, A first hinge that is a rotation axis positioned on the seat plate; A second hinge positioned on the seat plate support; And And a hinge connection member rotatably connected to the first hinge and the second hinge, wherein the chair comprises a seat plate and a backrest moving independently of the back plate. The method of claim 1, Further comprising an auxiliary seat plate rotatably connected to the front end of the seat plate, The auxiliary seat, characterized in that the user's posture, the back of the thigh or the upper part of the calf, characterized in that for guiding the user, the chair comprising a back plate and the lower back movable independently of the back. The method of claim 1, The backrest part is formed of an elastic member, characterized in that the tiltable at an angle independent of the back plate, the chair comprising a back plate and a back support moving independently from the back. The method of claim 1, The lower back support is characterized in that the concave-convex shape corresponding to the surface shape of the lumbar spine, chair comprising a back plate and the lower back movable independently of the back. In the tiltable chair, A seat plate including a waist support for supporting a waist of a user; A back plate including a blank portion into which the seat plate is inserted in a first posture of a user standing up; A side plate connected to the back plate and having front ends connected to both sides of the seat plate through hinge members; A bridge connected to the side plate to support the side plate; And A seat plate stopping part fixed to the leg to support the seat plate, The seat plate and the side plate are rotatably connected through the hinge member at their respective front end portions, so that the rear end portion of the seat plate is lowered to the lower portion of the chair in a second posture where the user leans back, and the waist support portion is empty. A chair comprising a seat plate and a backrest moving independently of the back, characterized by protruding from the portion. The method of claim 9, Wherein the seat plate stop is characterized in that the height is adjustable by the user's selection, the chair including a seat plate and the lower back movable independently of the back. The method of claim 9, The backrest portion of the chair comprises a seat plate and the backrest moving independently from the back, characterized in that the angle of the seat plate and 75 to 105 degrees preferably form an angle of 90 degrees. The method of claim 9, The hinge member, A first hinge that is a rotation axis positioned on the seat plate; A second hinge which is a rotating shaft positioned on the side plate; And And a hinge connection member rotatably connected to the first hinge and the second hinge.  The method of claim 9, The hinge member is a chair including a seat plate and a backrest moving independently from the back, characterized in that it comprises an elastic member with respect to the rotation direction therein. The method of claim 9, Further comprising: an auxiliary seat plate rotatably connected to the front end of the seat plate, The auxiliary seat, characterized in that the user's posture, the back of the thigh or the upper part of the calf, characterized in that for guiding the user, the chair comprising a back plate and the lower back movable independently of the back. The method of claim 9, The backrest part is formed of an elastic member, characterized in that the tiltable at an angle independent of the back plate, the chair comprising a back plate and a back support moving independently from the back. The method of claim 9, Wherein the waist support is characterized in that the concave-convex shape corresponding to the surface shape of the lumbar spine, chair comprising a back plate and the lower back movable independently of the back. The method of claim 9, The back plate further includes a neck rest in the neck rest recess embedded therein, wherein the neck rest recess is connected to the seat through one or more transfer coupling members coupled to the bottom, and the neck rest is vertically folded as the seat rests. A chair comprising: a seat plate and a backrest moving independently of the back, characterized in that it is movable. 10. The chair according to claim 9, wherein the back plate is fixable at two or more angles in a second position. The chair of claim 9, wherein the waistrest is adjustable in height. 11. 10. The method of claim 9, wherein the seat plate is divided into two parts, the whole and the rear portion, the rear portion is formed with a waist support for supporting the user's waist, the rear portion is connected to the side and the hinge and the whole is also one side hinged The lower plate is connected to the lower side of the front and rear facing each other that is not connected to the hinge is coupled to the back plate, characterized in that when the operation of the small lift the upper and rear facing each other, the back plate moving independently of the back And a lower back support.

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