KR20020094732A - A chair - Google Patents

Abstract

PURPOSE: A chair useable in home or office is provided to ensure a correct sitting attitude of users, especially workers sitting for a long time, children or students in growth period and to reduce lumbago rate by supporting back and both sides of upper part of body in three-dimensional structure of the chair. CONSTITUTION: The chair comprises a seat board cushion part to safely support hip of a user; a back cushion part inclined from the seat board at a certain angle and upright; a fixture support having a plurality of casters standing on ground; two arms with varied designs at both sides of the seat part; and a head rest to support head of the user at upper end of the back part. The chair has a joint construction to control height, to turn right/left directions and to push out the back part to sit more comfortably.

Description

Chair {A chair}

The present invention relates to a chair used in a home or an office, and particularly, to maintain a correct seating posture as well as to prevent the correction of the seating posture and the occurrence of low back pain, and to cover the upper body and both sides of the seated person at the same time. It is equipped with an elevation structure to support the three-dimensional close contact and the height of the head-rest can be easily and conveniently adjusted according to the body of the seated person. It is about low chair that can satisfy various needs of customers and improve the merchandise and reliability of the product.

In general, a chair (chair) has a design structure that can be seated in a more comfortable and convenient state for the seated person. Looking briefly at the configuration, the seat cushion portion of the seat shape and the rear end of the seat cushion portion can be seated. A basic configuration is made of a back support cushion connected to the upper back cushion portion and a fixed support provided on the bottom surface of the seat cushion portion so as to be stably seated on the ground.

In order to provide the comfort and comfort of the seated chair in the general configuration of the chair is equipped with a variety of shapes and shapes by selecting the armrests having a variety of shapes or headrests that can support the head on both sides of the seat cushion portion In order to move freely in the seated state, a plurality of casters are installed at the bottom of the fixing support at set intervals, and the left and right pivots and the height adjustment of the chair are also tilted backwards for comfort. Multifunctional chairs made of articulated joints are currently being used in homes and offices and are being used according to the user's taste.

As such, the effort to provide more comfortable and comfortable seated people is a situation where much mental and physical stress is overwhelmed to modern people due to the infinite competition for survival in today's rapidly developing and changing society. In search of multiple ways to minimize the occurrence of a number of new developments are being proposed. This started with most people sitting in chairs for a long time, and depending on their occupation, they may have to sit and work for a lifetime. In this case, the effect of sitting posture on the body will be considerable. Poor posture can lead to fatigue and cause pain in the body, which is often followed by medication or physical therapy. This improper posture is a habit, especially the malformation of the spine of the body, as well as the blood supply to the lower body can not be supplied smoothly, especially the growth of children and adolescents in the growth phase and physical disorders due to the malformation of the spine may occur Is required.

On the other hand, the posture in daily life (body posture) refers to the dynamic, not the shape that maintains the body, but not the static shape, the human posture is attached to the head, spine, pelvis, lower extremity and control Maintained by the coordination of ligament muscles that play a role. Its center is the spine, which is a very flexible column in which many vertebrae are joined by an elastic body (cartilage) called an intervertebral disc, whereby many refractions and extensions interact antagonically. You will change your posture. Spinal flexors include abdominal muscles, gluteus maximus and femoral flexors, and as extensor muscles, the trunk trunk and quadriceps muscles are mainly relaxed or contracted.

Thus, looking at the general posture in daily life divided as follows.

First, both parts of the upright posture in an upright state are generally evaluated by the side posture when standing still. Kendall, in the United States, is guided by a centerline based on the repair of a weight on a physiological and epidemiological point of view. That is, in a good posture, the center line passes from the ear to the shoulder joint, through the center of the rib cage and abdomen, and through the large trochanter (大 轉子), slightly ahead of the center of the knee joint to the front of the surgery. The deviation from this line is classified as bad posture, but it is generally accepted in the posture judgment in the present in the sense that when a part of the body deviates from a certain arrangement, another part moves to maintain an equilibrium relationship. And correct posture unconsciously refers to a state of muscle tension or a balanced state of each part of the body. Therefore, less fatigue. The posture of leaning back causes fatigue due to the large amount of energy consumed by muscle tension, and the excessively relaxed posture consumes little energy, but causes strain on the ligaments.

In addition, the right posture to sit on the chair, the spread of automobiles and changes in the form of labor made humans spend more time sitting on the chair. Wells in the United States classifies postures into extreme types and divides them into humanoid and manned types. In contrast to the development of civilization, the fact that they are degenerate into manned postures cannot be denied. At present, both sides of the posture sitting on a chair for a long time is more important than standing posture. Standing posture is controlled by one's own doctor, but when sitting on a chair, it is controlled by artificial factors rather than one's doctor, so it is necessary to select a chair that can sit in a comfortable position. As the main guidelines, the height, depth, angle, inclination of the back and the shape of the bend are important. The height is equal to the length of the lower thigh, the thigh is horizontal or the knee is slightly higher, higher than this tends to be tired because the extensor of the waist (피로) acts. If the depth is not slightly shorter than the length of the thigh, the back of the knee is compressed, and in the long time it causes blood circulation in the lower extremities. The angle of inclination is approx. 3-5 ° for office work and about 15 ° for rest. The angle of inclination of the backrest should be about 100 ~ 110 ° for office and about 115 ~ 130 ° for rest. The bend of the backrest should be gentler than the bend of the recess when standing. If the bend is strong, the intervertebral disc is stressed, so the waist is prone to fatigue. In a good chair, it is balanced and does not work on the extension or refraction of the waist, but the important thing is that the muscles and the intervertebral discs tend to bend if you continue to do the same posture no matter how well you sit in a good chair. It is important.

In bed, the right posture in bed is high in the stomach and the pillow causes the neck to become vertebrae, causing shoulder stiffness, and in the lateral stomach, the neck is parallel to the spine. The higher side is good. The lying position is governed by whether the bed is soft or hard.

Therefore, in a soft and soft bed, the stomach and stomach are rounded, and the entire spine is rounded, compressing the intestines, obstructing the hops, stretching the abdominal muscles, leaving fatigue in the morning, and in the side and stomach, the spine causes scoliosis. In a hard bed, it is good to have the centerline of the spine in parallel with the bed, so keep the correct position as described above depending on where you lie down.

As such, sitting in a chair in a bad posture for a long time causes fatigue to accumulate and cause deformation of the spine, resulting in spondylolysis, spondylolisthesis, and hernia of intervertebral. discs) and spondylosis deformans.

As described above, since the changes in the body according to each posture is developed in various ways, it is possible to confirm how important it is to sit in a chair for a long time and maintain a correct posture. As such, the vertebrae (vertebrae / vertebra) that hold important skeletons in the body are very important bones, which are the centers of the skeleton of the body, also called the vertebrae or vertebrae. It consists of a vertebral body belonging to and belonging to a central body, a bow-shaped bladder that extends backwardly, and several protrusions, and is surrounded by the vertebral body and the bladder, and has a large pore in the center. V) is made up.

The human spine consists of seven cervical vertebrae, 12 thoracic vertebrae, 5 lumbar vertebrae, 5 sacral vertebrae, 4 to 5 lumbar vertebrae, and each vertebrae. Each group has its own unique form, making it easy to identify them. Cervical vertebrae are generally thin and have large bore. In particular, the first cervical spine is different in shape, but lacks a vertebrae, so it becomes almost annular, so it is also called a vertebrae. It protrudes in the shape of the fingertip and the spine is rotated with the skull loaded on it as an axis.

Herein, the dentate ridges correspond to the vertebral bodies of the vertebrae, and because of this protrusion, the axial vertebrae have the same shape as a person having a desk leg, and the thoracic and lumbar vertebrae generally become larger as the lower one, and the five vertebrae are fused. The sacrum becomes small and there is no blame.

As such, since the overall structure of the chair affects the posture of the seated person and the body is significantly affected by the posture, the structure of the chair according to the correct posture of the seated person and the ergonomic design is required, and more preferably, the chair The correct posture should be maintained by the structure that the structure can properly support the seated person's body.

Even if it is composed of a chair structure with good conditions and environment, if the seated person is sitting in a bad position, it may cause the deformity of the spine, and it may not supply blood to the lower body, thereby improving the physical development of children and adolescents during the growing season. As mentioned earlier, there is an increased risk of physical impairment such as deformity of the spine, back pain and cumulative fatigue. Therefore, the chair is simply ergonomic in the seating object, comfortably and comfortably supporting the seated person, while squeezing appropriately to the body shape of the seated person to maintain a correct posture to prevent spinal malformation and low back pain and fatigue should not occur physically after long sitting There is no abnormality.

As mentioned above, the spine, which is the center of the body, recognizes that the structure of the chair and the seating posture are inseparable from each other, and the efforts of various products to maintain the right posture to satisfy various needs of customers and Research and development is being made, many of which have been filed in Korea and have a characteristic configuration, and have a backrest chair having a posture correction function of Patent No. 154552, spine protection spring chair of Publication No. 98-56979, and No. 01-28552. Spine and waist pulling health chairs of the heading, the right posture chairs of Korean Utility Models Nos. 99-4006, 99-12624, and 01-1083, chairs for preventing back pain, and chairs with armrests, respectively, are proposed. There is a bar.

Another conventional chair is a chair having a dual back structure formed to equally bisect the back cushion portion and elastically support both sides of the dorsal side except the spine of the body. It does not have the function of inducing the right seating posture to the extent that it is elastically supported while distributing the load on both sides except the back cushion of the chair, which is more comfortable and comfortable.

Accordingly, the present invention has been made to solve the fundamental problems of the prior art, the purpose of which is to maintain a correct seating posture when using the workers in the industry, such as a low back or long-term seating, growth children, students Of course, the three-sided compression is supported on three sides as if the upper body and both sides of the seated person are not wrapped at the same time so as to minimize the incidence of sitting posture and low back pain, and the head rest restlessly and conveniently according to the seated body. The chair is designed to improve the productability and reliability of the product because it is equipped with a elevation structure that can select and adjust the height of the chair. ) To provide.

1 is a perspective picture of a chair according to the present invention;

2 is a front photograph of the present invention chair,

3 is an enlarged sectional view taken along the line A-A shown in FIG.

4 is a perspective view of a chair frame according to the present invention;

5 is a schematic exploded perspective view of the head restraint apparatus of the present invention;

Figure 6 is a perspective view of the frame showing an operating state in which each part of the chair of the present invention is adjusted,

7a, 7b are respective perspective views of the frame illustrating another embodiment of a chair according to the present invention;

8A and 8B are respective frame perspective views illustrating another embodiment of another chair of the present invention;

9A and 9B are partially enlarged front and plan views illustrating another embodiment of the headrest portion of the chair of the present invention.

Explanation of symbols on main parts of drawing

100: chair, 110: seat cushion portion

111: seat plate 112 (124,162): cushion body

113 (125, 163): outer shell, 120: back cushion portion

121: backing plate, 122: elastic body

123 (123a): side pressing plate, 130: lifting operation part

131: guide body, 131a: fixed bracket

132: rotation axis, 133: bevel gear

134: gear housing, 134a: guide

135: working shaft, 135a: handle

135b: coupling portion, 136: elevating pipe

140: fixed support, 141: caster

150: armrest, 151: frame

160: head rest, 161: backing plate

161a: auxiliary support plate, S: receiving space

In order to achieve the above object, the present invention sequentially wrapped the cushioning body and the outer shell of the upper plate of the seat plate which is compressed and bent and cut and cut into various shapes, shapes, and setting curves with compressed plywood in a corresponding shape. An elastic body that is inclined at a desired angle to both sides of the seat plate cushion portion formed so that the lower body such as the buttocks and thighs of the lower occupant is seated, and the back support plate is bent in a set shape and shape and both sides are cut to the same size to secure a receiving space. By a pair of side pressing plates that are firmly coupled to bend elastically within a certain range of angles, and the cushioning body and the shell where the entire surface of the back support plate and the side pressing plates are cut in a corresponding shape are sequentially wrapped and seated. Three sides are formed to support in three dimensions as if the sides of the upper body and the sides are simultaneously wrapped together A backrest cushion portion having a lifting operation means therein, and a support plate processed in a set shape to support the head of the seated seat are formed on the upper portion of the backrest cushion portion, and the entire surface thereof has a cushioning body and a shell of a corresponding shape. The headrest is formed to be sequentially wrapped and is connected to the lifting operation means of the back cushion portion and is made by selectively raising and lowering the height directly according to the physical condition of the seated occupant, and the rotation of the chair in the left / right direction and the height adjustment of the chair are Of course, it has a joint structure that can be bent at a certain angle to the rear, and the upper end is fixed to the center of the lower surface of the seat cushion portion, and the lower end is securely seated on the ground, and is composed of a fixed support on which a plurality of casters are formed to move freely according to the seat selection. It provides a chair characterized in that.

Here, a pair of frames bent at right angles are firmly coupled to both sides of the seat plate lower surface of the seat plate cushion portion so as to maintain a more comfortable and comfortable posture in the seating position of the seat plate. According to the frames are respectively formed armrests of various shapes having a structure to be fixed and used after adjusting the height.

The side pressing plate of the back cushion portion is processed along the corresponding curved surface on the basis of the standard values for height and weight so as to be in close contact with the curves of both waists of the body, and the elastic body is also flexed to perform its function in an optimal state. It is formed according to elastic strength with restoring force.

In addition, the elevating operation means of the back cushion portion is a pair of guide pipes with fixed brackets attached to the upper and lower outer surfaces of the upper and lower outer surfaces at predetermined intervals, and an outer circumferential surface of the pair of guide pipes inserted into the lower end of one of the guide pipe bodies. A set of bevel gears with a screw shaft formed in the whole, a shaft insertion hole having a key groove in the center so that power is transmitted at right angles when vertical and horizontal are crossed, and a set of bevel gears are stably inside while maintaining the vertical state. A gear housing provided with a guide tube accommodated and opened at an upper side thereof and extending a predetermined length from one side thereof, and bent at a right angle to the second stage to form a handle at one end and a coupler at the other end thereof, and the coupling portion guides the gear housing. Through the pipe, the bevel gear is inserted into the shaft insertion hole of the bevel gear And a working shaft formed to be interconnected to each other, and fixed to one side of the support plate of the head rest at a corresponding interval to be inserted into the inside of the pair of guide tubes, wherein a thread is formed at an inner surface of the bottom of one of the pipe bodies. Consists of a pair of lifting pipe formed to be inserted while the rotating shaft is rotated.

Here, the drive shaft of the drive motor is fitted to the shaft insertion opening of the bevel gear in a horizontal state of the set of bevel gears may be formed to be forward and reverse rotation in accordance with the power and electrical signals.

The head rest is processed into a set shape and shape using a single support plate or forms an auxiliary support plate in which a predetermined portion of both sides of the support plate is cut, and using separate elastic bodies, the auxiliary support plates are the same at both ends of the support plate. Protruding while maintaining the angle may be formed to be elastically bent in a certain range, the predetermined portion of both sides of the support plate may be formed to be bent forward protruding while maintaining the same angle.

On the other hand, the side pressing plate may be formed of a single or evenly divided side pressing plate made of a single body in each of the receiving space on both sides of the back support plate, the seat plate and the back support plate is formed in a single interconnected state or each It can be formed by selecting any one of the structural shape formed in a separate state, it may be formed by extending and protruding by bending a certain portion of both sides of the back support plate while maintaining the same angle.

In the present invention as described above to support while being squeezed three-dimensionally on three sides as if not wrapping the upper body and both sides of the seated person at the same time, and to adjust the height of the headrest easily and conveniently according to the body of the seated Equipped with an elevation structure, it is possible to maintain correct seating posture when using the elderly workers who are relatively weak in the waist or those who require long-term seating, growing children, and students, as well as helping to correct sitting posture and minimizing the incidence of low back pain. By distributing the load concentrated on the spine to minimize the fatigue of the spine, you can sit more comfortably and comfortably, so you can lower the fatigue of the body and provide smooth blood circulation to the lower body, and fall asleep for a short break during study or work. Even if the upper body is biased to the left / right or in an unstable position By preventing the disturbance, you can rest in a convenient and stable posture, which can satisfy the various needs of customers and improve the merchandise and reliability of the product.

(Example)

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

1 and 2 are a perspective view and a front view of a chair according to a preferred embodiment of the present invention, Figure 3 is an enlarged cross-sectional view taken along line A-A shown in Figure 1, Figure 4 shows a chair frame of the present invention 5 is a perspective exploded perspective view of the head restraint apparatus of the present invention, Figure 6 is a perspective view of the frame showing the operating state of each part of the chair of the present invention, Figure 7a, 7b is another of the chair according to the present invention 8A and 8B are respective frame perspective views illustrating another embodiment of another chair of the present invention, and FIGS. 9A and 9B are different views of the headrest portion of the chair of the present invention. A partially enlarged front view and a plan view illustrating an embodiment are respectively shown.

As can be seen from this, the chair 100 of the present invention has a seat plate cushion portion 110 formed so as to comfortably support the buttocks at the time of seating, and is vertically formed at a predetermined inclination angle so that the lower portion of the seat cushion portion It is connected to the rear end of the 110 is formed to support the entire back of the upper body of the seat cushion portion 120, the upper end is fixed to the center of the lower surface of the seat plate cushion portion 110, a plurality of casters 141 on the ground Fixed support 140 provided to be stably seated, the armrest support 150 having various shapes on both sides of the seat plate cushion portion 110, and the head formed to support the head of the seated on the upper backrest cushion 120 The rest 160 is comprised.

Here, the left and right rotation and the height adjustment of the chair 100, and also has an articulated structure that can be flipped a certain angle to the rear for comfort, and is formed to combine ergonomic design and versatility, in the left / right direction It is equipped with a joint structure that can be bent at a certain angle to the rear as well as adjusting the height of the chair and the chair, and can be easily adjusted by operating each lever according to the choice of the seated person. The upper end is fixed to the center of the lower surface of the seat plate cushion 110. The lower end is stably seated on the ground and is formed of a fixed support 140 in which a plurality of casters 141 are formed to be freely moved according to the seat selection.

In addition, a pair of frames 151, which are bent at right angles, are firmly coupled to both sides of the lower surface of the seat plate 111 of the seat plate cushion portion 110 to maintain a more comfortable and comfortable posture in a sitting position. Fitted to the upper end of the frame 151 is coupled to the seat according to the selection of the seat 151 according to the height of the frame 151, respectively, after the height adjustment is possible to use a variety of shapes having a structure having a structure.

The seat cushion portion 110 is a cushion body and outer shell 112, 113 having a compressed plywood and the entire upper surface of the seat plate 111 formed by pressing, bending and cutting into various shapes and shapes, and a set curved surface in a corresponding shape. ) Is sequentially wrapped so that the lower body such as the buttocks and thighs of the seated person is seated.

In addition, the back cushion portion 120 is bent in a set shape and shape and both sides of the back portion is inclined at a desired angle to both sides of the back support plate 121 is formed in the same size so as to secure the receiving space (S) by a constant elastic body 122. A cushioning body 124 in which a pair of side pressing plates 123 are firmly coupled to each other to be elastically bent within a range of angles, and the entire surfaces of the rear support plate 121 and the side pressing plates 123 are cut in a corresponding shape. ) And the outer shell 125 are sequentially wrapped to form a three-dimensional support three-dimensionally as if sitting on both sides flanked together with the entire upper body back of the seated, and the lifting operation unit 130 is provided therein.

Side compression plate 123 of the back cushion portion 120 is processed along the corresponding curved surface on the basis of the standard value for each height and weight so as to be in close contact with the curve of the waist of both sides of the body and the elastic body 122 also in the optimal state It is formed into a shape designed to be joined according to elastic strength having a corresponding bending and restoring force so that the function is performed.

The lifting operation unit 130 of the back cushion portion 120 is a pair of guide pipe 131 is fixed to each of the fixing brackets (131a) attached to one side of the upper and lower outer side at a predetermined interval and the pair of Rotating shaft 132, which is threaded on the entire outer circumferential surface of the guide tube 131 and inserted into the lower end of the guide tube 131, and a shaft insertion hole having a key groove in the center is vertically and horizontally intersected so that power is transmitted at a right angle. A set of bevel gears 133 and a set of bevel gears 133 are accommodated inside the stably while maintaining the vertical state, the upper surface is open and the guide pipe 134a is provided with a certain length extending from one side The handle 134 and the handle 135a are formed at one end and a coupler is formed at the other end, and the coupling part 135b is formed through the guide tube 134a of the gear housing 134. Of a set of bevel gears (133) The headrest at an interval corresponding to be inserted into the operation shaft 135 and the guide shaft 131 formed to be firmly connected to the shaft insertion opening of the bevel gear 133 placed in a horizontal state in the ( It is fixed to one side of the support plate 161 of 160, a screw thread is formed on the inner surface of one of the lower end of the pipe consists of a pair of lifting pipe 136 is formed to be inserted while the rotating shaft 132 is rotated.

Here, the drive shaft of the drive motor is inserted into the shaft insertion opening of the bevel gear 133 placed in the horizontal state of the bevel gear 133, the forward and reverse rotation is possible in accordance with the operation (ON) / OFF (OFF) of the power and electrical signals. It can also be formed.

The head rest 160 is formed on the upper backrest cushioning portion 120, the support plate 161 is formed in a set shape to support the head of the seated seat, the entire surface of the cushion body 162 of the corresponding shape is formed. And the outer shell 163 is formed to be sequentially wrapped and is connected to the lifting operation unit 130 of the back cushion portion 120 to selectively raise and lower the height directly according to the physical condition of the seated person.

Here, the head rest 160 is processed in a set shape and shape using a support plate 161 made of a single body or forming the auxiliary support plate (161a) in which both sides of the support plate 161 is cut off and a separate elastic body ( Subsidiary support plates 161a may be protruded while maintaining the same angle and be formed to be elastically bent in a predetermined range by maintaining the same angle in front of each other at both ends of the support plate 161 by using the 122, and on both sides of the support plate 161. A predetermined portion may be formed by bending forward while extending at the same angle.

On the other hand, the side pressing plate 123 may be selectively formed of one or an evenly divided side pressing plate 123a each formed of a single body in both receiving spaces (S) of the back support plate 121, the seat plate The 111 and the rear support plate 121 may be formed by selecting any one of the structural shapes formed in a single unit state connected to each other or formed separately in a separate state, and predetermined portions of both sides of the rear support plate 121 are the same. The angle may be maintained while being bent forward and protruded.

Chair of the present invention having the configuration as described above will be described in more detail with reference to the accompanying drawings, the operation is adjusted as follows to be more comfortable and comfortable to use.

first,

As described above, according to the present invention, while holding the upper body back and both sides of the seated person at the same time as the three-dimensional compression on the three sides (三 面) to support and, depending on the body of the seat can be easily and conveniently selected and adjusted the height of the head rest It is equipped with a elevation structure so that it is possible to maintain correct seating posture when using it for elderly workers who are relatively weak in the waist or those who require long-term seating, growing children, and students, as well as helping to correct sitting posture and minimizing the incidence of low back pain. When the load concentrated on the spine is distributed to minimize the fatigue of the spine, you can sit more comfortably and comfortably, so you can lower the fatigue of the body and provide a smooth blood circulation to the lower body, and sleep for a short break during study or work. The upper body is biased left / right or in an unstable position It can rest in a comfortable and stable posture by preventing distractions, thus satisfying customers' various needs and improving the merchandise and reliability of the product.

Although the present invention has been shown and described with reference to certain preferred embodiments, the present invention is not limited to the above-described embodiments, and those skilled in the art to which the present invention pertains without departing from the spirit of the present invention. Various changes and modifications may be made by the user.

Claims (8)

The upper surface of the seat plate, which is compressed, bent and cut into various shapes, shapes, and setting curves with compressed plywood, is wrapped in a cushioned shape and shell, which is cut into corresponding shapes, so that the lower body such as the buttocks and thighs of the seated person is seated. Formed seat cushion portion, A pair of side compressions that are bent into a set shape and shape and both sides are cut into the same size to secure a receiving space so as to be inclined at a desired angle on both sides of the back support plate to be elastically bent within a certain range by an elastic body. Plates are formed, and the cushioning body and the outer surface of the back support plate and the side pressing plates cut in a corresponding shape are sequentially wrapped so that the three sides support three-dimensionally as if the sides of the upper body and the sides of the seat are simultaneously wrapped. And the back cushion portion having a lifting operation means therein, A backing plate processed in a set shape is formed on the upper back of the back cushion portion to support the head of the seated person, and the entire surface thereof is formed by sequentially wrapping the cushion body and the outer shell of the corresponding shape, and connected with the lifting operation means of the back back cushion part. Head rest formed to be used by selectively raising and lowering directly according to the physical condition of the seated person, Rotating in the left / right direction and adjusting the height of the chair, as well as the articulated structure that can be bent at an angle to the rear, the upper end is fixed to the center of the lower surface of the seat plate cushion portion and the lower end is stably seated on the ground, depending on the seat selection A chair comprising a fixed support on which a plurality of casters are freely moved. According to claim 1, wherein the side pressing plate of the back cushion portion is processed along the corresponding curved surface on the basis of the standard value for each height and weight so as to be in close contact with the curve of the waist of both sides of the body and the elastic body also performs its function in the optimum state A chair characterized in that it is formed in a shape determined according to elastic strength with bending, restoring force, etc. as applicable. According to claim 1, The lifting operation means of the backrest cushion is a pair of guide pipe body is fixed to each of the fixing brackets are attached to the upper and lower outer one surface at a predetermined interval, A rotating shaft having a thread formed on the entire outer circumferential surface of the pair of guide tubes inserted into the lower end of the pair of guide tubes, A set of bevel gears through which a shaft insertion hole with a key groove is formed in the center so that vertical power and horizontal power are transmitted at right angles; The gear housing is provided with a guide tube extending in a predetermined length from one side of the bevel gear is stably received inside while the vertical bevel gear is maintained, It is bent at right angles to form a handle at one end and a coupling hole at the other end, and the coupling portion is firmly connected to the shaft insertion hole of the bevel gear placed horizontally in the set of bevel gears through the guide tube of the gear housing. An operating shaft formed to be connected, The pair is fixed to one side of the support plate of the headrest at a corresponding interval to be inserted into the inside of the pair of guide tube, a screw thread is formed on the inner surface of the lower end of one of the tube formed to be inserted while the rotating shaft is rotated Chair, characterized in that consisting of a lifting pipe. According to claim 1, wherein the head rest is processed in a set shape and shape using a single support plate or forming a plurality of sub support plates in which both sides of the support plate is cut and using a separate elastic body in front of both ends of the support plate The chair is characterized in that the auxiliary supporting plate is formed to be able to be bent to a certain range elastically by protruding while maintaining the same angle. The chair of claim 1, wherein the support plate of the headrest is formed by bending and protruding forwards while predetermined portions on both sides are maintained at the same angle. The chair as claimed in claim 1, wherein the side pressing plates are selectively formed of one or an evenly divided side pressing plates each made of a single body in both receiving spaces of the back support plate. The chair according to claim 1, wherein the seat plate and the back support plate are formed by selecting any one of structural shapes formed in a single unit state connected to each other or formed separately in a separate state. The chair of claim 1, wherein predetermined portions of both sides of the rear support plate are formed to be bent forward and protrude to extend while maintaining the same angle.