KR200377417Y1 - That turn over waist exercise combined use chair - Google Patents

Abstract

The present invention relates to a chair (chair), such as for office use, more specifically, in addition to the simple chair function, the waist tilting (backward bending) movement through the action of applying an artificial force to the backrest while sitting on a seat The present invention provides a chair that can be conveniently used for the lower back movement so that the bed can be laid comfortably by taking an easy adjustment of the backrest angle if necessary.

To this end, the present invention, the frame 10; A seat 20 provided to be capable of height adjustment with respect to the frame 10 and to be integrally movable; One end is fixed to the seat 20 and the arm support 32 is fixed to the support base 31 for the support of both arms and the handle 33 is formed to be bent to naturally grasp during the waist movement with respect to the arm support Arm hook portion 30; A backrest 40 having a rear portion fixedly supported by the backrest folding means 50 so as to be folded separately from the seat 20; In order to stably support the seat 20 at a predetermined height with respect to the ground, the front crust 60 is fixedly mounted to the front crust axis 62 with respect to the front end of the frame 10 and provided with a wheel 63 for movement. And it is foldable to the rear crust axis 72 to be foldable with respect to the rear end of the frame 10 in order to stably support the seat 20 with the front crust 60 at the same height with respect to the ground and And a rear crust 70 having a wheel 73 for movement at the same time; connecting the first and second connecting shafts 81 and 82 between the back support 70 of the backrest and the rear crust 70. It is supported and supports the backrest 40 to be erected in a stable manner at the same time, and at the same time the center back portion 12 of the frame 10 around the second connecting shaft 82 when the backrest 40 is folded. Act as a lever so that the force is pulled obliquely The rear crust 70 moves inwardly by a predetermined distance about the rear crust 72 of the frame 10 so as to correspond to the front crust 60 provided as the front end of the frame 10 that is lifted. It consists of a brace 80 for pushing.

Description

That turn over waist exercise combined use chair}

The present invention relates to a chair (chair), such as for office use, more specifically, in addition to the simple chair function, while the user sitting on the seat by applying an artificial force to the backrest to bend or erect (backward bending) The present invention relates to a chair for combined use of the lower back movement, which allows the user to easily exercise and to adjust the angle of the backrest uniformly when necessary, so that the bed can be laid comfortably and take a simple rest.

A chair is a device that is generally designed to sit back and lean back, and is widely used for work or study in the office or at home, and is used in various forms and materials depending on the purpose. As shown.

In addition, given the busy life of modern people, work stress, and a lot of time sitting in a chair during the day, the function of the chair is inevitably important.

However, most of the chairs that have been known or used so far are mostly designed or changed in the structure and shape of the seat or the back to provide comfort, so that consumers who want to work out or relax while working or studying It does not satisfy their desire at all.

With this in mind, some of the expensive chairs have a chair equipped with acupressure, vibration, or heat treatment device. However, these are expensive, and thus they are economically difficult to buy and use by the general public. Because it is a structure that generates indirect movement, it is impossible to expect a great exercise effect compared to the direct exercise method that moves the body directly.

In addition, according to the exercise chair structure disclosed in Korean Utility Model Registration No. 344423, only the backrest is configured to be retracted and operated only within the range of 90 ° -180 ° with respect to the seat through the operation of the fixing lever. The chair of the configuration is semi-automatic because the artificial force is applied only when the backrest is folded and is automatically returned to the coil spring-type elastic member when the backrest is turned, and the back angle of the backrest is up to 180 around the seat. Because it is not so large as °, simple abdominal exercise may be possible, but it is impossible to flip the waist completely backwards, so you can not expect a great exercise effect due to the actual waist folding.

Therefore, the present invention has been devised to solve such problems in the related art, and an object of the present invention is not only to function as a general chair, but also to artificially apply the force directly to the backrest while sitting on a seat to fully tilt or back the waist. It is possible to directly exercise, and if necessary, by adjusting the fixed back angle fixed inclination to lie down with a bed to provide a simple rest and relaxation exercise such as sleeping to provide a chair.

To achieve the object of the present invention, the chair for combined use of the lower back movement, the frame; A seat having a height adjustable with respect to the frame and mounted to be integrally movable; An arm rest portion having one end fixed to the seat and an arm rest on which a support for both arms is fixed, and an arm grip portion bent to naturally grasp during waist movement with respect to the arm rest; A backrest having a rear end fixedly supported by a backrest folding means so as to be folded separately from the seat; A front crust installed to be fixed to the front crust axis with respect to the front end of the frame so as to stably support the seat at a predetermined height with respect to the ground; A rear crust provided with a wheel for movement at the same time as the front crust is foldable with respect to the rear end of the frame so as to stably support the seat at the same height with respect to the ground; It is supported by the first and second connecting shafts between the backing means of the backrest and the rear crust so that the backrest is normally steadily erected at the same time and the second connecting shaft when the backrest is folded. The rear crust is moved inwardly by a predetermined distance around the rear crust axis of the frame in response to the front crust provided as the front end of the frame being inclined while the center axis of the frame is inclined upward. It is composed of braces to push as much as possible.

In addition, according to the present invention, the backrest supporting means for stably fixing the backrest, the backrest fixing plate is fixed to the back of the backrest with a plurality of fixing screws and the backrest fixing plate is arranged at a predetermined interval and at the same time frame It is preferable to constitute a fixed backrest support means including a support each provided with a shaft hole for the center shaft and the first connecting shaft of the brace.

In addition, according to the present invention, the backrest support means for stably fixing the backrest, the backrest fixing plate is fixed to the back of the backrest with a plurality of fixing screws and a pair of arranged at a predetermined interval on the backrest fixing plate A guide provided with a rail, a rail groove corresponding to the rail, and a shaft hole for a center axis of the frame and a first connecting shaft of the brace, and a rail of the guide for controlling the height adjustment of the backrest with respect to the guide. It is preferable to constitute an adjustable backrest support means including adjustment screws which are tightened and released respectively for each of the grooves and each threaded groove formed therethrough.

In addition, according to the present invention, the chair is a support tube fixed to both sides of the frame to securely hold the lower body during the lower back movement, a foot support rod of a predetermined length which is installed to move through the support tube, and the It is preferable that the foot hanger further includes a foot hanger rod provided as a tip of the foot hanger support rod and a length adjusting means for controlling the degree of drawing when the foot hanger rod is pulled out.

Length adjusting means according to the present invention, the control hole formed in the support pipe, and the semi-spherical locking grooves formed in the foot support rod to correspond to the control hole. It is preferable that the rear end is composed of a ball that is elastically supported by a spring to be selectively engaged with the locking grooves and a stopper that is screwed to the outside of the control hole to prevent the spring and the ball from being separated.

In addition, according to the present invention, the chair is an angle control for forcibly suppressing the point force movement of the rear perception is supported through a plurality of angle adjusting holes formed in the frame and the angle adjusting hole in order to constantly adjust the inclination angle of the backrest It is preferable that the backrest angle control means composed of a pin is further provided.

In addition, according to the present invention, it is preferable that the rear wheel is further provided with an auxiliary wheel for inducing a stable folding motion of the backrest.

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

Figure 1 is a perspective view from the front of the overall configuration of the combined exercise chair according to the present invention, Figure 2 is an assembly side view thereof.

1 and 2, the chair 1 according to the present invention includes a frame 10 having a “c” shaped steel shape, and an open part is installed to be positioned downward.

In the upper portion of the frame 10, a seat 20 usually made of a cushion material is mounted. The seat shaft 22 is penetrated by the seat 20 so that height can be adjusted with respect to the said frame 10 according to the operation of the lever 21. As shown in FIG. The lifting structure of the seat shaft 22 is a well-known technique already known in the art, and a description thereof will be omitted.

The seat 20 is provided with an arm rest portion 30, one end of which is fixed to the lower portion. The arm rest portion 30 is an arm support 32 to which the support member 31 of the elastic member for naturally supporting both arms in a sitting position is fixed, and a handle which can be naturally grasped during the waist movement with respect to the arm support 32. 33 is integrally bent and formed. Wherein the handle 33 is preferably to cover the safety cover 33a of the cushion material to prevent the soft gripping and sliding due to the waist movement.

At the rear of the seat 20, the lower back portion of the backrest 40, which is usually made of a cushion material, can be folded separately from the seat 20 so as to stably support the back when sitting on the seat 20. The backrest supporting means 50 having a predetermined structure is fixedly supported in an orthogonal state about the seat 20.

The backrest support means 50 which supports the backrest 40 foldably with respect to the said sheet | seat 20 may fix the backrest 40 fixedly with respect to the said sheet | seat 20, and the said seated person The height of the backrest 40 may be adjusted and fixed to be selectively adjusted as needed by the difference in the sitting height of the bar, which will be described in detail with reference to FIGS. 3 and 6.

3 is an exploded perspective view showing the configuration of the fixed backrest supporting means 150 according to the present invention, the backrest fixing plate 152 fixed to a plurality of fixing screws 151 at the rear bottom of the backrest 40; The first connection shaft 81 for arranging and supporting the center shaft 12 of the frame 10 and the one end of the brace 80 to be described later are arranged to be arranged at regular intervals on the backrest fixing plate 152, respectively. Consists of the support 153 is provided with shaft holes 153a, 153b to be installed.

Therefore, according to the fixed backrest support means 150 configured as shown in Figure 3, the backrest 40 is always fixed to a constant height state with respect to the seat 20 so that the backrest 40 maintains a stable support that can be folded operation do.

Figure 6 is an exploded perspective view showing the configuration of the adjustable backrest support means 250 according to the present invention, the backrest fixing plate 252 is fixedly supported by a plurality of fixing screws 251 on the rear bottom of the backrest 40 And a pair of rails 253 disposed at predetermined intervals on the backrest fixing plate 252 and rail grooves 254 corresponding to the rails 253, respectively, and having a center axis of the frame 10 described later. A guide 255 having shaft holes 255a and 255b through which the first connecting shaft 81 for connecting one side of the support 12 and the support 80 is provided, respectively, and the guide 255. Adjustment screw 256 in the form of a handle is tightened and released for each screw groove 255c formed to penetrate the rail groove 254 of the guide 255 to artificially control the height adjustment state of the backrest 40 It is composed of

Therefore, according to the adjustable backrest support means 250 configured as shown in Figure 6, if you want to adjust the height of the backrest 40 as needed, first loosen the adjustment screws 256, then loosen the backrest 40 Move to the proper position up and down. Then, at this time, the rail 253 of the backrest fixing plate 252 fixedly installed to the fixing plate 252 of the backrest 40 is moved and adjusted along the rail groove 254 of the guide 255, and the backrest 40 to an appropriate position. When the adjustment is completed, tighten the adjusting screws 256 again, for example, when the rail 253 is tightened against the rail groove 254 of the guide 255 as shown in the enlarged view of FIG. Is to be maintained at the adjusted height, it is possible to adjust the height of the backrest 40 according to the user's body shape.

Subsequently, referring to FIGS. 1 and 2, front and rear perceptions 60 and 70 are installed at both ends of the frame 10 to support the seat 20 stably at a constant height with respect to the ground. It is.

First, the front perception 60 will be described. One end of the first perception member 61 is fixed to the front perception shaft 62 so as to be fixed to the lower portion of the front end of the frame 10. At the lower end of the 61, the second perceptual member 64 provided with the moving wheel 63 is horizontally installed. At this time, the first perceptual member 61 is fixedly supported by the flow preventing pin 65 as shown in the dashed-dotted line in Figure 2, it can be always maintained vertically.

Here, the first perception member 61 of the front perception 60 is fixed to the front perception shaft 62, and the assembly is configured such that the flow is prevented by the flow prevention pin 65. ) Is to enable the disassembly and assembly from the frame 10, it is not necessarily a flow structure by the flow preventing pin 65, but it will be possible to perform other modifications of the other structure that can replace it.

Next, when the rear perception 70 is described, one end of the first perception member 71 is inclined toward the rear perception axis 72 at the rear end lower portion of the frame 10, and the first perception member is provided. At the lower end of the 71, the second perceptual member 74 for the wheel 73 for movement is horizontally installed.

Therefore, the seat 20 mounted to the upper portion of the frame 10, by the front rear crust 60, 70 is always possible to maintain a stable height while maintaining a constant height relative to the ground, and each wheel for movement Free movement is possible through (63) (73). Here, the wheels 63 and 73 for each movement are well known wheels having a structure capable of rotating 360 ° with respect to the second perceptual member 64 and 74.

On the other hand, the second perception member 74 of the rear perception 70 is further provided with an auxiliary wheel 75 for securing the folding safety according to the folding operation of the backrest (40). Here, the auxiliary wheel 75 is normally spaced apart slightly from the ground (h) as shown in FIG. 2 by the wheel 73 for movement during the non-folding of the backrest 40, and then the backrest 40 as shown in FIG. In operation, when the rear crust 70 is retracted inward to correspond to the front crust 60, the chair 1 may be moved by the back motion of the backrest 40 by being brought into contact with the ground instead of the main wheel 73 for movement. ) Is not to fall easily to guide the stable folding operation of the backrest (40) is made.

Referring to FIGS. 1, 2, 3, and 6, the center of the frame 10 when the backrest 40 is folded and raised between the backrest support 50 and the rear crust 70 is shown. A brace 80 is provided which acts as a lever so that the backrest 40 pivots about 180 ° or more with respect to the seat 20 about the shaft 12.

The brace 80 is formed by the support 153 of the fixed support means 150 of FIG. 3, both ends of which constitute the first support member 71 and the back support means 50 of the rear perception 70. The shaft holes 153b and the shaft holes 255b formed by the guide 255 of the adjustable support means 250 of FIG. 6 are disposed as first and second connecting shafts 81 and 82.

In addition, when the backrest 40 is flipped backward by the lever action of the brace 80, the center shaft 12 portion of the frame 10 is the first connecting shaft 81 of the backrest support means 50. It is to be inclined to the center, and when the lifting operation of the frame 10, the front crust 60, which is provided as its tip portion is also forcibly pulled and moved, and at the same time the rear crust 70 is the brace ( Due to the push action of 80, it is moved and retracted inward to correspond to the front perception 60 about the rear perception axis 72 of the frame 10.

Therefore, the frame 10 is lifted in an overall tilted angle by the center axis 12 portion being pulled upward while the backrest 10 is turned over through the lever action of the brace 80, and at the same time, the frame 10 The front crust 60 provided as a front end and the back crust 70 by the pushing action of the brace 80 are simultaneously inward with respect to the front crust axes 62 and 72 of the frame 10. It is easily moved and operated, the seat 20 mounted to the upper side of the frame 10 is also heard at the same inclination angle as the frame 10 can be quickly and smoothly bent operation of the backrest 40 will be.

Referring to FIG. 1, the frame 10 is provided with a foot hanger 90 for hanging the foot by manipulating forwards during a waist tilting motion. Foot hanger (90) is a support tube (91) fixed to both ends of the upper end of the frame (10), a foot support rod (92) installed to be movable through the support tube (91), and the foot support rod Foot hanger rod (93) provided at the front end portion of the 92 and the length adjusting means 94 for automatically controlling the degree of withdrawal of the foot hanger rod (93).

Here, the foot bar 93 is most preferably formed at both ends bent in the same curved state as the leading edge surface of the sheet 20 in order to eliminate the inconvenience, such as the jam due to the withdrawal operation, at this time the foot bar rods of both ends As for 93, it is most preferable to remove the pressure applied to the ankle and to protect the cover piece 93a made of a cushion material for soft contact friction.

In addition, the length adjusting means 94 for controlling the draw length of the foot support bar 92 according to the present invention, the control hole 941 formed at a predetermined position of the support tube 91, and the control hole 941 And a semi-spherical locking groove 942 formed of a plurality of foot support rods 92 corresponding to the ball, and a ball 944 that is elastically supported by a spring 943 so as to be mutually engaged with the locking groove 942. The stopper 945 is screwed to the outer end of the control hole 941 to prevent the spring 943 and the ball 944 from being separated.

In the semi-spherical locking groove 942 formed by the foot support rod 92, the locking groove 942 formed at both ends is a ball when the foot support rod 92 is fully drawn out or inserted into the front rear surface ( 944 is to be prevented from artificial movement, the locking groove formed between them is to be caught when the foot support bar 92 is pulled out step by step as necessary to prevent free movement.

On the other hand, according to the present invention, the backrest angle control means 100 is further provided for constantly adjusting the tilting angle of the backrest 40 (for example, within the range of 90 ° -180 °). The backrest angle control means 100 is selectively penetrated and supported by the plurality of angle adjusting holes 101 and the angle adjusting holes 101 formed of the frame 10 so as to have a rear perceptual axis of the frame 10 ( 72 is composed of an angle control pin 102 for forcibly suppressing the operation that the rear crust 70 is retracted inward more than necessary. At this time, only a plurality of angle adjusting holes 101 are formed in the drawing, but when it is desired to finely adjust the angle of the backrest 40, it becomes possible by forming a larger number.

In addition, the angle control pin 102 is preferably tied to a separate string to secure the storage groove 103 formed in the frame 10 to prevent loss.

When using the chair 1 according to the present invention configured as described above, a state of using a simple office or upholstery chair or a state of doing a back tilting exercise will be described with reference to FIGS. 2 and 4.

First, referring to FIG. 2, the seat 20 is seated with respect to the frame 10, and the backrest 40 is fixed with respect to the seat 20 by the backrest support means 50. In this case, it is possible to sit and watch the office work in this case. In this case, the backrest 40 maintains a stable support state through the backrest support means 50, so that a predetermined angle is exerted before applying the artificial force to retreat backwards. It will remain in a standing state.

And, the seat 20 is made of a stable support to a certain height by the front rear crust 60, 70 is installed at both ends of the frame 10, free movement by each wheel (63) (73) It becomes possible. In addition, since the foot hanger 90 is in a state where the foot hanger 93 is inserted inward, the foot hanger 90 does not interfere with the movement of the body, especially the lower body.

In such a state, for example, in the chair 1 state as shown in FIG. 2, when the waist is to be moved backward, the foot motion 90 is pulled forward, and then the ankle is attached to the foot hanger 93. To prevent the flow of the lower body to walk. Then, in a state where the user sits on the seat 20, the back is in close contact with the back 40, and then artificially exerts an upper body force on the back 40 so that the back 40 is slowly flipped backward as shown in FIG. When the backrest 40 is folded backrest through the action of the brace 80, which is supported by the first and second connecting shafts 81 and 82 between the backrest folding means 50 and the rear crust 70. The corresponding part of the frame 10 connected by the means 50 and the center shaft 12 is lifted entirely inclined by being pulled upwards about the first connecting shaft 81 of the brace 80.

In addition, the frame 10 is inclined upward and at the same time, the front and rear perceptions 60 and 70 are moved inward to each other about the front and rear perception axes 62 and 72 by the lifting operation of the frame 10. The seat 20, which is moved and manipulated by the wheels 63 and 73 and the auxiliary wheels 75 to be retracted, and is provided at an upper side thereof by the lifting operation of the frame 10, is also inclinedly positioned so that the backrest ( 40 is bent at 180 ° or more with respect to the seat 20, and the bending motion of the waist is surely performed by the tilting operation of the backrest 40. FIG.

On the other hand, the backrest 40, which is tilted with respect to the seat 20, is not a structure in which the backrest is arbitrarily elastically operated as in the conventional general chair, and therefore, by the wetting force of the upper body which does not force the upper body by using the waist. It will always stay wet.

And, if you want to work up the waist again in the above state, holding the handle 33 of the arm hanger 30 in the same state as shown in Figure 4 to force the upper body to work up, at this time the foot foot Since the state of being held by the part 90 is maintained, the upper body can be easily erected without a phenomenon that the lower body is lifted from the seat 20, and as the upper body is forcibly raised, the backrest 40 is also lifted upward. The center shaft 12 portion of 10) is returned to its original position by being pressed by the force of the body, and the brace 80 connected to the rear crust 70 by the upright motion of the backrest 40 is also interlocked. It is operated so as to support the backrest 40, and the front back crust 60, 70 is also operated by the return force of the frame 10 with respect to each crust axis 62 and 72 as shown in FIG. .

Therefore, according to the chair (1) according to the present invention, by directly applying the upper body force to the backrest 40, the lower back movement, or the direct waist movement through the continuous operation to artificially raise the upper body, that is, direct The waist bending movement is possible, and since the backrest 40 is always leaned at least 180 degrees with respect to the seat 20 during the waist movement, the amount of waist movement is increased by that amount. Of course, the abdominal exercises will be possible, and the upper and lower body movement around the waist will be able to more reliably and easily.

Meanwhile, referring to FIG. 5, the backrest 40 is fixed at a predetermined inclination angle with respect to the seat 20 so that the backrest 40 is constantly adjusted to lie down with a bed and take a simple rest or sleep. Referring to the state of the solid line and broken line in 5), if you want to fix the backrest 40 at a predetermined inclination angle (for example, in the range of 90 °-180 °) first, any one angle adjustment formed of the frame 10 first When the angle control pin 102 is selectively inserted with respect to the ball 101 and then the backrest 40 is flipped, the first perceptual member 71 of the rear crust 70 connected to the backrest 40 is operated. The motion of being locked by the angle control pin 102 is further restrained inward.

Therefore, the backrest 40 is prevented from being further retracted inward by the blockage of the angle control pin 102, so that the backrest 40 is no longer flipped back even if the backrest 40 is further flipped back. To maintain the angle.

Although the present invention has been described with reference to the accompanying drawings, many modifications and changes can be made without departing from the scope of the following claims can be readily made by those skilled in the art. Modifications will be within the technical scope of the present invention.

As described above, according to the chair of the present invention, as well as normal office work or study, if necessary, the backrest can be more reliably exercised by artificially applying a force to the backrest, and the backrest angle of the backrest is further increased. Since it is retracted more than 180 ° with respect to the seat, the back movement is not only large and much larger, but also the backrest and the maneuver of the backrest are made easier by the support of the brace. It can provide an advantage such as to greatly increase.

In particular, when the chair is applied to a high-priced product as well as a mid-priced product, the present invention is designed to produce a low price so that anyone can purchase and use it without any economic burden. By doing so, it is possible to relieve the pressure load concentrated on the waist, to relieve the fatigue of the body through the back movement, and also to exercise the abdominal muscles.

In addition, according to the chair of the present invention, if necessary, the backrest with respect to the seat within a certain angle range (about 90-180 ° range), such as bed to provide the advantage of easy lying down to rest or sleep Will be.

1 is an overall perspective assembly perspective view of a chair according to the present invention;

2 is an assembled side view of a chair according to the present invention;

Figure 3 is an exploded perspective view showing a fixed backrest structure according to the present invention;

Figure 4 is a side view of the operating state showing the state of reclining back to the abdomen using the chair according to the present invention;

Figure 5 is a partial cutaway side view of the backrest is fixedly adjusted at a constant angle according to the present invention;

Figure 6 is an exploded perspective view showing an adjustable backrest structure according to the present invention.

<Description of the symbols for the main parts of the drawings>

10: frame 12: center axis

20: sheet 30: arm hook portion

34: handle 40: backrest

50: backrest support 60,70: front crust

62,72: Front and back crust 63,73: Wheels for movement

75: auxiliary wheel 80: brace

81.82: First and second connecting shafts 90: Foot hook portion

94: length adjusting means 100: backrest angle control means

Claims (7)

A frame 10; A seat 20 provided to be capable of height adjustment with respect to the frame 10 and to be integrally movable; One end is fixed to the seat 20 and the arm support 32 is fixed to the support base 31 for the support of both arms and the handle 33 is formed to be bent to naturally grasp during the waist movement with respect to the arm support Arm hook portion 30; A backrest 40 having a rear surface fixedly supported by the backrest folding means 50 so as to be able to be folded separately from the seat 20; In order to stably support the seat 20 at a predetermined height with respect to the ground, it is fixedly installed with the front crust axis 62 with respect to the front end of the frame 10, and the front crust provided with the wheels 63 for moving ( 60); In order to support the seat 20 together with the front crust 60 at the same height with respect to the ground, the wheel for movement while being foldable to the rear crust shaft 72 so as to be foldable with respect to the rear end of the frame 10. A rear crust 70 provided with 73; It is supported by the first and second connecting shafts 81 and 82 between the support means 50 of the backrest and the rear crust 70 so that the backrest 40 can be stably erected normally. At the same time, when the backrest 40 is folded, the center shaft 12 of the frame 10 is forced to be inclined to be inclined about the second connecting shaft 82, and at the same time, the slant is lifted. A brace for pushing the rear crust 70 to move inwards by a predetermined distance about the rear crust axis 72 of the frame 10 in response to the front crust 60 provided as a front end of the frame 10 ( 80) chair combined with a lower back movement, characterized in that consisting of. According to claim 1, The backrest support means 50 for stably supporting the backrest 40, The backrest fixing plate 152 fixedly attached to the back of the backrest 40 by a plurality of fixing screws 151 And, the shaft support 153a (153b) for the center shaft 12 of the frame 10 and the first connecting shaft 81 of the brace 80 are arranged at regular intervals on the backrest fixing plate 152, respectively. Combination chair back waist characterized in that the fixed support means 150 including a support 153 provided. According to claim 1, The backrest support means 50 for stably supporting the backrest 40, The backrest fixing plate 252 is fixedly attached to the back of the backrest 40 with a plurality of fixing screws 251 And a pair of rails 253 disposed at predetermined intervals on the backrest fixing plate 252, and rail grooves 254 corresponding to the rails 253, and having a center axis 12 of the frame 10 and In order to control the height adjustment of the backrest 40 with respect to the guide 255 and the guide hole 255a and 255b respectively provided for the first connecting shaft 81 of the brace 80, the guide 255 Waist tilting movement, characterized in that the adjustable support means 250 consisting of adjusting screws 256 that are tightened and released respectively for the rail groove 254 and the threaded grooves 255c formed through the guide 255, respectively. Combination chair. According to claim 1, wherein the chair further comprises a foot hanger (90) which is pulled out to the front in order to stably hold the lower body during the lower back movement, The foot hanger 90 includes a support tube 91 fixed to both sides of the frame 10, a foot support rod 92 of a predetermined length installed through the support tube 91 to be movable, and the Waist tilting movement characterized in that it consists of a foot hanger rod (93) provided as the tip of the footrest support rod (92) and a length adjusting means (94) for automatically controlling the degree of withdrawal when the foot hanger rod (93) is withdrawn Combination chair. The method according to claim 4, wherein the length adjusting means 94, the control hole (941) formed in the support tube 91, the semi-spherical hook formed in the foot support rod 92 to correspond to the control hole (941) With grooves 942. A ball 944 elastically supported by a spring 943 and a control hole 941 to prevent the spring 943 and the ball 944 from being detached from the hook grooves 942. Combination chair back waist movement, characterized in that consisting of a stopper 945 screwed to the outside. According to claim 1, The chair is supported through the plurality of angle adjusting holes 101 and the angle adjusting hole 101 formed of the frame 10 to constantly adjust the inclination angle of the backrest 40, the rear Combination chair back waist movement characterized in that the backrest angle control means (100) further comprises an angle control pin (102) for forcibly suppressing the movement of the point force of the crust (70). The chair according to claim 1, further comprising an auxiliary wheel (75) for inducing a stable folding motion of the backrest (40) as the rear perception (70).