KR100840206B1 - Back supporting apparatus of a chair - Google Patents

Abstract

A back supporting device of a chair is provided to enable a user to move his/her back freely while he/she maintains the state of having his/her back completely adhered to plural backplates. A back supporting apparatus of a chair includes a vertical frame(110), a horizontal frame and at least two backplates(170). The vertical frame is installed on the rear of a chair. The horizontal frame is elastically coupled to the vertical frame. The backplates are elastically coupled to the horizontal frame. The vertical frame and the horizontal frame are elastically coupled to each other by a first coupling unit(150). The first coupling unit includes a first elastic portion, a first coupling portion(153), and a second coupling portion(155). The first elastic portion is disposed between the vertical frame and the horizontal frame.

Description

Back support device of chair {BACK SUPPORTING APPARATUS OF A CHAIR}

1 is a cross-sectional view showing a back support device of a chair according to a first embodiment of the present invention.

2 is a side view of FIG. 1.

3 is a front view showing the back support device of the chair according to the first embodiment of the present invention.

4 is a cross-sectional view taken along line IV-IV of FIG. 3.

5 is a cross-sectional view taken along line V-V of FIG. 3.

6 is a cross-sectional view showing an operating state of the back support device of the chair according to the first embodiment of the present invention.

7 is a rear view showing an operating state of the back support device of the chair according to the first embodiment of the present invention.

8 is a cross-sectional view showing a back support device of a chair according to a second embodiment of the present invention.

9 is a side view of FIG. 8.

10 is a cross-sectional view showing an operating state of the back support device of the chair according to the second embodiment of the present invention.

11 is a cross-sectional view showing a back support device of a chair according to a third embodiment of the present invention.

12 is a cross-sectional view showing an operating state of the back support device of the chair according to the third embodiment of the present invention.

13 is a cross-sectional view showing the back support device of the chair according to the fourth embodiment of the present invention.

14 is a cross-sectional view showing an operating state of the back support device of the chair according to the fourth embodiment of the present invention.

15 is a cross-sectional view showing the back support device of the chair according to the fifth embodiment of the present invention.

16 is a cross-sectional view showing an operating state of the back support device of the chair according to the fifth embodiment of the present invention.

17 is a side view showing a tilting chair to which a back support device according to the first embodiment of the present invention is applied.

18 is a side view showing a general chair to which the back support device according to the first embodiment of the present invention is applied.

Explanation of symbols for main parts of the drawings

110, 210, 510: vertical frames 130, 230, 330, 430, 530: horizontal frames

170, 370, 470, 570: climb 150, 250, 550: first coupling unit

190, 390, 490, 590: second coupling unit

The present invention relates to a chair, and more particularly, to a back support device of a chair that allows the user to freely move the back while keeping the user's back completely in contact with the plurality of backs.

In general, a chair includes a seat for supporting the buttocks of the user, a back for supporting the user's back, and a base for supporting the seat and the back. Furthermore, in order to stably support the left and right portions of the back, a technology in which a plurality of back plates are included in the backrest is being gradually developed.

In particular, the conventional backrest is provided on the base, but vertically positioned vertically upward from the rear of the base, and horizontally positioned horizontally and screwed to the vertical frame and elastically coupled to the left and right of the horizontal frame, respectively Left and right backplanes are included.

Therefore, when the user sits on the left side and leans his back on the left and right backs, the force applied by the user's back causes the part of the left back facing the right back and the part of the right back facing the left back to be pushed back. On the other hand, the left back and the right back cover the user's spine and back muscles, thereby significantly reducing the weight on the waist. Ultimately, an excessive load on the spine is not applied, thus preventing the occurrence of back diseases such as scoliosis.

However, the back of the conventional chair may have the following problems.

If the user sits on the left side and leans his back on the left and right backs and then moves his back to the left / right, his back may not be in close contact with the left or right back.

For example, when the user leans against the back and moves left, the left part of the back remains in close contact with the left back, but the right part of the back may fall off the right back. In addition, when the user leans against the back and moves to the right, the right part of the back remains in close contact with the right back, but the left part of the back may fall off the left back. If one part of the back is kept away from the back, the muscles of the lower back may be overwhelmed, and if it is kept in such a state for a long time in a PC room, an office or a reading room, the back may be overwhelmed. .

The present invention is to solve the problems of the prior art, the technical problem of the present invention, while maintaining the user's back completely in contact with the plurality of back, the user can freely move the back support of the chair To provide a device.

In order to achieve the above object, the back support device of the chair according to an embodiment of the present invention is a vertical frame provided on the back of the chair, a horizontal frame elastically coupled to the vertical frame, and burned in the horizontal frame At least two backs that are sexually coupled.

In addition, the vertical frame and the horizontal frame is elastically coupled to each other by a first coupling unit, and the first coupling unit is a first elastic portion located between the vertical frame and the horizontal frame, the vertical frame It may include a first coupling portion for coupling one side of the first elastic portion, and a second coupling portion for coupling the other side of the first elastic portion to the horizontal frame.

In addition, as a first embodiment of the first coupling unit, the first elastic portion includes at least one first elastic body made of rubber or resin material having elasticity, and the first coupling portion is the at least one first elastic body. A first fastening member provided at one end of the coupling member, a coupling plate provided on the front of the vertical frame and having at least one first coupling hole formed therein, and the at least one first coupling hole and the at least one first elastic body And at least one first bolt fastened to the first fastening member, and the second coupling part corresponds to a second fastening member provided at the other end of the at least one first elastic body, and a center of the horizontal frame. The second coupling portion of the coupling portion formed with at least one third coupling hole, and the at least one second coupling hole and the at least one first elastic body It may include at least one second bolt that is fastened to the material.

On the other hand, as a second embodiment of the first coupling unit, the first elastic portion is one first elastic body made of rubber or resin material having elasticity, the first coupling portion is at least one provided on one end of the first elastic body A first fastening member, a coupling plate provided on the front of the vertical frame and having at least one first coupling hole formed therein, and at least one first fastening member coupled to the at least one first coupling hole and the at least one first fastening member. A first bolt, and the second coupling part includes at least one second fastening member provided at the other end of the first elastic body and a center of the horizontal frame, and at least one second coupling hole is formed therein. And at least one second bolt fastened to the at least one second coupling hole and the at least one second fastening member.

On the other hand, as a third embodiment of the first coupling unit, the first coupling unit is provided on the front of the vertical frame, located on the rear surface of the horizontal frame and having a shape of the horizontal frame, and the horizontal plate A clip provided at a front surface of the first insertion groove having a circular shape, a spherical first hinge provided at a rear surface of the horizontal frame and inserted into the first insertion groove, and provided between the horizontal frame and the horizontal plate; However, the first hinge may include first elastic bodies respectively provided on both sides of the first hinge.

In addition, the first elastic body may be made of a rubber material and have a shape of a dupe in which an air layer is formed therein.

Meanwhile, as an embodiment in which the above-described first coupling unit does not need to be used separately, the vertical frame and the horizontal frame are elastically coupled by an elastic body made of rubber material, and the vertical frame and the horizontal frame are made of metal material. When made, one end of the elastic body is coupled by thermal fusion to the vertical frame, and the other end of the elastic body may be coupled by thermal fusion to the horizontal frame.

Further, each of the at least two back plates is elastically coupled to each other by a second coupling unit to the horizontal frame, and the second coupling unit includes a second elastic portion located between the horizontal frame and the back plate, A third coupling portion for coupling one side of the second elastic portion to the horizontal frame, and a fourth coupling portion for coupling the other side of the second elastic portion to the back plate.

In addition, as a first embodiment of the second coupling unit, the second elastic portion includes a second elastic body made of rubber or resin material having elasticity, and the third coupling portion is provided at one end of the second elastic body. A third fastening member, a third coupling hole formed in the front of the horizontal frame, and a third bolt fastened to the third coupling hole and the third fastening member, and the fourth coupling portion is the second elastic body. And a fourth fastening member provided at the other end of the fourth coupling member, a fourth coupling hole formed at the rear surface of the back plate, and a fourth bolt fastened to the fourth coupling hole and the fourth coupling member.

On the other hand, as a second embodiment of the second coupling unit, the second elastic portion is a leaf spring made of a metallic material having elasticity, the first bent portion where one side of the leaf spring is bent, and the other side of the leaf spring A bent second bent portion; and a third coupling portion; a first fastening hole formed at the first bent portion; a third coupling hole formed at the front of the horizontal frame; and the third coupling hole and the third coupling hole. And a third bolt fastened to the first fastening hole, and the fourth coupling part includes a second fastening hole formed at the second bent portion, a fourth coupling hole formed at a rear surface of the back plate, and the fourth coupling hole and the It may include a fourth bolt fastened to the second fastening hole.

The second coupling unit may further include a position correction member positioned between the fourth coupling portion and the second bent portion and having a through hole formed therein so that the fourth bolt can be inserted therein.

In addition, the second bent portion may be bent toward the center of the horizontal frame in the longitudinal direction of the horizontal frame.

On the other hand, as a third embodiment of the second coupling unit, the second coupling unit is a portion of the horizontal frame is cut and bent from the horizontal frame, and one side of the section is bent and the first fastening hole is formed therein It may include a first bent portion, a third coupling hole formed on the back of the back plate, and a third bolt fastened to the third coupling hole and the first coupling hole.

The apparatus may further include a position correction member positioned between the third coupling hole and the second bent portion and having a through hole formed therein so that the third bolt may be inserted therein.

In addition, the second bending portion is the back support device of the chair is bent toward the center of the horizontal frame along the longitudinal direction of the horizontal frame.

On the other hand, as a fourth embodiment of the second coupling unit, the second coupling unit is provided at the front of the horizontal frame and has a cone-shaped space portion therein and an insertion portion having a circular second insertion groove formed at the center thereof. And a cone-shaped insertion member provided at the end of the spherical second hinge inserted into the second insertion groove and provided at the end of the back plate, and positioned between the inner circumferential surface of the insert and the outer circumferential surface of the insertion member. It may include a second elastic body.

Meanwhile, as an embodiment in which the second coupling unit described above does not need to be used separately, the at least two back plates and the horizontal frame are elastically coupled by an elastic material made of a rubber material, and the back surface of the at least two back plates and the When the horizontal frame is made of a metal material, one end of the elastic body may be coupled to the horizontal frame by thermal fusion, and the other end of the elastic body may be coupled to the rear surface of each of the at least two back plates by thermal fusion.

In addition, the at least two back plates include a first back plate and a second back plate respectively provided on the left and right sides of the horizontal frame, and the cross sections of each of the first and second back plates are concave to the rear of the chair. Can be.

In addition, longitudinal sections of each of the first and second back plates may have a convex shape toward the front of the chair.

In addition, the surface of the set section of the longitudinal cross-section of each of the first and second back plate may have a straight line shape.

In addition, the surface of the section in which the side of the user touches of the longitudinal section of each of the first and second back plate may have a larger convexity than other sections.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention. As those skilled in the art would realize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention.

1 is a cross-sectional view showing a back support device of a chair according to a first embodiment of the present invention, Figure 2 is a side view of Figure 1, Figure 3 shows a back support device of a chair according to a first embodiment of the present invention 4 is a sectional view taken along the line IV-IV of FIG. 3, and FIG. 5 is a sectional view taken along the line VV of FIG. 3.

6 is a cross-sectional view showing an operating state of the back support device of the chair according to the first embodiment of the present invention, and Figure 7 is a rear view showing an operating state of the back support device of the chair according to the first embodiment of the present invention. to be.

The back support device of the chair according to the first embodiment of the present invention, as shown in Figures 1 and 3, the vertical frame 110, the horizontal frame 130 is elastically coupled to the vertical frame 110 And at least two back plates 170 elastically coupled to the horizontal frame 130.

The vertical frame 110 is positioned perpendicular to the back of the chair (see FIG. 17 or FIG. 18), and may be mounted to a seat (see “710” in FIG. 18) of the chair (see FIG. 18), and the base (FIG. 17, the base (see "610" in FIG. 17) in the case of a type having a position (located below the seat to support the seat, where a tilting apparatus or the like is mounted as necessary). It may be mounted on. Of course, for ease of assembly, the vertical frame 110 may be detachably mounted to the seat or base of the chair.

The horizontal frame 130 is positioned to intersect the vertical frame 110 and is elastically coupled to the vertical frame 110.

The at least two back plates 170 may include a first back plate 171 and a second back plate 172, wherein the first back plate and the second back plate 171, 172 are elastically attached to the horizontal frame 130. Combined. Specifically, the first back plate 171 is located on the left side with respect to the center of the horizontal frame 130, and the second back plate 172 is located on the right side with respect to the center of the horizontal frame 130.

Furthermore, in order to secure more contact surfaces with the back of the user, the cross sections of each of the first and second back plates 171 and 172 may be concave and rounded to the rear of the chair. In other words, when viewed from the front of each back, the shape of the contact line lying in the horizontal direction among the virtual surface contact lines is concave into the rear of the chair, and the concave shape is in the longitudinal direction of the center of each back. It can be formed symmetrically or asymmetrically based on the contact line that lies.

Furthermore, in order to properly support the lumbar spine of the user, longitudinal sections of each of the first and second back plates 171 and 172 may be convexly rounded toward the front of the chair. In other words, when the back plate 170 is viewed from the front, the shape of the contact line placed in the vertical direction among the virtual surface contact lines is convex protruding toward the front of the chair, and in particular, the contact line placed in the vertical direction, As a first example, the center section may have a round shape such as the upper section and the lower section, and have a convex shape as a whole, and as a second example, as shown in FIG. 4, the center section is a straight line. It may have a shape (see “L” in FIG. 4) and its upper and lower sections are inclined to the rear of the chair to have an overall convex shape. Therefore, according to the first and second examples, the upper part convex in each back plate 170 can support the load of the upper body of the user to reduce the load on the lumbar spine, and the lower part convex in each back plate 170 Close to the pelvis can relieve the stress. In addition, the convexity of the contact line placed in the longitudinal direction is such that the portion closer to the user's side (see FIG. 5) is larger than the portion closer to the user's spine (not shown), as shown in FIGS. 4 and 5. It may be desirable to, and furthermore, the portion close to the user's spine may be formed to be almost flat as a whole.

Therefore, according to the back support device of the chair according to the first embodiment of the present invention, since the first and second back plates 171 and 172 and the horizontal frame 130 are elastically coupled first, When the seat is seated (see "630" in Fig. 17), the back is completely in contact with the first and second back plates 171 and 172. Secondly, since the horizontal frame 130 and the vertical frame 110 are elastically coupled, it is possible to freely move the back according to the user's movement while maintaining such close contact.

In detail, the vertical frame 110 and the horizontal frame 130 may be elastically coupled by the first coupling unit 150.

Hereinafter, the first coupling unit 150 will be described in detail with reference to FIGS. 1 and 2.

The first coupling unit 150 is to elastically couple the horizontal frame 130 and the vertical frame 110 with each other, the first elastic portion 151, the first coupling portion 153, and the second coupling It may include a unit 155.

The first elastic part 151 is positioned between the vertical frame 110 and the horizontal frame 130, and may include at least one first elastic body 1511 made of a high elastic rubber or resin material. Here, the number of the at least one first elastic body 1511 may be determined according to the elastic force of the first elastic body 1511 and the pushing force of the user. That is, the number of the first elastic bodies 1511 may be determined in a range in which the pushing force of the user is within the range of the elastic force.

The first coupling part 153 couples one side of the first elastic part 151 to the vertical frame 110, and is perpendicular to the first fastening member 1531 provided at one end of the first elastic body 1511. A coupling plate 1533 provided at the front of the frame 110 and having a first coupling hole 1533a formed therein, and a first bolt 1535 fastened to the first coupling hole 1533a and the first fastening member 1531. ) May be included. Therefore, when the first bolt 1535 is screwed into the first coupling hole 1533a and the first fastening member 1531, one side of the vertical frame 110 and the first elastic body 1511 is engaged.

More specifically, the first fastening member 1531 is formed on the first body 1531a made of a hard synthetic resin material integrally provided at one end of the first elastic body 1511, and the four sides of the first body 1531a. It may include a plurality of branches (1531b) branched to the first through-hole (1531c) formed in each of the plurality of branches (1531b). In addition, a second through hole 1533b may be further formed in the coupling plate 1533 to allow the first body 1531a to be inserted therein. Accordingly, the first body 1531a and the first elastic body 1511 are inserted through the second through hole 1533b at the rear of the coupling plate, and the first bolt 1535 is inserted into the first through hole of the branch 1531b. After being inserted through 1531c, when the screw is fastened to the first coupling hole 1533a, one side of the vertical frame 110 and the first elastic body 1511 is coupled.

Of course, as another example, if it is not necessary to consider the convenience of assembly (including convenience such as replacement parts later), even if the first coupling portion 153 having the above-described configuration is not used, the vertical frame 110 and the first One end of the elastic body 1511 may be joined by an adhesive (not shown) or the like. As another example, even when the first coupling part 153 having the above-described configuration is not used, when the vertical frame 110 is made of a metal material, the first elastic body 1511 is thermally fused to the vertical frame 110. It may be combined directly by.

The second coupling part 155 couples the other side of the first elastic part 151 to the horizontal frame 130, the second fastening member 1551 provided at the other end of the first elastic body 1511, and the horizontal frame. The coupling portion 1553 corresponding to the center of the 130 and the second coupling hole 1553a is formed, and the second bolt 1555 fastened to the second coupling hole 1553a and the second fastening member 1551. ) May be included. Therefore, when the second bolt 1555 is screwed into the second coupling hole 1553a and the second fastening member 1551, the other side of the horizontal frame 130 and the first elastic body 1511 are coupled to each other.

More specifically, the second fastening member 1551 may include a second body 1551a made of a hard synthetic resin material integrally provided at the other end of the first elastic body 1511, and an insert molding (2) on the second body 1551a. A first nut 1551b may be included. Therefore, when the second bolt 1555 is sequentially fastened to the first coupling hole 1533a and the first nut 1551b, the other side of the horizontal frame 130 and the first elastic body 1511 are coupled to each other.

Of course, as another example, if it is not necessary to consider the convenience of assembly (including convenience such as replacement parts later), even if the second coupling portion 155 having the above-described configuration is not used, the horizontal frame 130 and the first The other end of the first elastic body 1511 may be joined by an adhesive (not shown) or the like. As another example, even when the second coupling part 155 having the above-described configuration is not used, when the horizontal frame 130 is made of a metal material, the first elastic body 1511 is thermally fused to the horizontal frame 130. It may be combined directly by.

In addition, the horizontal frame 130 and the at least two back plates 170 may be elastically coupled to each other by the second coupling unit 190.

Hereinafter, the second coupling unit 190 will be described in detail with reference to FIGS. 1 and 2.

The second coupling unit 190 elastically couples the first and second back plates 171 and 172 (hereinafter referred to as “back plates”) to the horizontal frame 130, respectively, and the second elastic part 191. ), A third coupling unit 193, and a fourth coupling unit 195.

The second elastic part 191 is positioned between the horizontal frame 130 and the back plate 170 and may include a second elastic body 1911 made of rubber or resin material having elasticity. As described in the following paragraphs describing the fourth coupling unit 195, the second elastic bodies 1911 may have a form in which two second elastic bodies 1911 are arranged in an up / down direction.

The third coupling part 193 couples one side of the second elastic part 191 to the horizontal frame 130, and includes a third fastening member 1931 provided at one end of the second elastic body 1911 and a horizontal frame. The third coupling hole 1932 formed on the front surface of the 130 and the third bolt 1933 fastened to the third coupling hole 1932 and the third fastening member 1931 may be included. Therefore, when the third bolt 1933 is screwed into the third coupling hole 1932 and the third fastening member 1931, one side of the horizontal frame 130 and the second elastic body 1911 is engaged.

More specifically, the third fastening member 1931 is inserted into the third body 1931a and the third body 1931a made of a hard synthetic resin material integrally provided at one end of the second elastic body 1911. It may include a second nut (1931b). Therefore, when the third bolt 1933 is sequentially fastened to the third coupling hole 1932 and the second nut 1931b, one side of the horizontal frame 130 and the second elastic body 1911 is coupled.

Of course, as another example, if it is not necessary to consider the convenience of assembly (including convenience such as replacement parts later), even if the third coupling portion 193 having the above-described configuration is not used, the horizontal frame 130 and the first One end of the two elastic bodies 1911 may be joined by an adhesive (not shown) or the like. As another example, even when the third coupling unit 193 having the above-described configuration is not used, when the horizontal frame 130 is made of a metal material, the second elastic body 1911 is thermally fused to the horizontal frame 130. It may be combined directly by.

The fourth coupling part 195 couples the other side of the second elastic part 191 to the back plate 170, and includes a fourth fastening member 1951 provided at the other end of the second elastic body 1911 and the back plate 170. The fourth coupling hole (1953) formed on the back of the) and the fourth coupling hole (1953) and the fourth bolt (1955) fastened to the fourth fastening member (1951). Therefore, when the fourth bolt 1955 is screwed into the fourth fastening member 1951 and the fourth coupling hole 1953, the other side of the back plate 170 and the second elastic body 1911 are coupled to each other.

Further, when the second elastic body 1911 has a form in which two (hereinafter, referred to as "upper second elastic body" and "lower second elastic body") are arranged in the up / down direction, the third fastening member 1931 ) Is provided between the upper second elastic body 1911 and the lower second elastic body 1912, the fourth fastening member 1951 is provided at the end of the upper second elastic body 1911, the lower second elastic body 1912 A fifth fastening member 1957 may be further provided at the end of the). In addition, as the fifth fastening member 1957 is further provided, the fifth coupling hole 1958 formed in the fifth bolt 1959 and the back plate 170 may be further included.

More specifically, the fourth fastening member 1951 is formed on the fourth body 1951a and the fourth body 1951a made of a hard synthetic resin material integrally provided at the end of the upper second elastic body 1911. A fifth body 1955a including a third through hole 1951b, and the fifth fastening member 1957 is made of a hard synthetic resin material integrally provided at an end of the lower second elastic body 1911, and the fifth It may include a fourth through hole (1957b) formed in the body (1957a). Accordingly, when the fourth bolt 1955 is screwed into the third through hole 1951b and the fourth coupling hole 1953, the back plate 170 and the upper second elastic body 1911 are coupled to each other, and the fifth bolt 1959. When the screw is fastened to the fourth through hole 1957b and the fifth coupling hole 1958, the back plate 170 and the lower second elastic body 1911 are coupled to each other.

Of course, as another example, if it is not necessary to consider the convenience of assembly (including convenience such as replacement of a part later), the second elastic body 1911 is not necessarily used for the fourth coupling unit 195 having the above-described configuration. And back plate 170 may be coupled by an adhesive (not shown) or the like. As another example, even when the fourth coupling portion 195 having the above-described configuration is not used, when the back surface of the back plate 170 is made of a metal material, the second elastic body may be used for thermal fusion to the back surface of the back plate 170. May be combined directly.

Operation of the back support device of the chair according to the first embodiment of the present invention is as follows.

As shown in FIG. 6, when the user sits on the left portion (see “630” in FIG. 17), the pushing force acts in the direction of the arrow 1, and thus the first back plate 171 rotates clockwise in the drawing. The second back plate 172 rotates counterclockwise in the drawing. Then, when the user twists the upper body of the body in the direction of the arrow 2, the pushing force acts in the direction of the arrow 2, and this pushing force is a horizontal frame 130 elastically supported by the vertical frame 110 to FIG. Since it is rotated counterclockwise with respect to the reference, the user's back is rotated counterclockwise with respect to FIG. 6 with the horizontal frame 130 while maintaining close contact with the first and second back plates 171, 172. do. At the same time, when the back of the chair is seen from the rear of the chair, as shown in FIG. 7, the horizontal frame 130 elastically supported by the vertical frame 110 according to the movement of the upper body of the user is shown in FIG. 7. Rotate counterclockwise as a reference.

Therefore, as described above, when the user is seated on the seat (refer to "630" in FIG. 17), the back is completely in close contact with the first and second back plates 171 and 172, while maintaining such close contact. According to the movement of the user can freely move the back.

8 to 10, a back support device for a chair according to a second embodiment of the present invention will be described.

8 is a cross-sectional view showing a back support device of a chair according to a second embodiment of the present invention, FIG. 9 is a side view of FIG. 8, and FIG. 10 is a back support device of a chair according to a second embodiment of the present invention. It is a cross-sectional view which shows operation state.

Since the back support device of the chair according to the second embodiment of the present invention is the same as the first embodiment of the present invention, except for the first coupling unit 250, as shown in Figs. Hereinafter, the first coupling unit 250 will be described in detail in the second embodiment of the present invention.

The first coupling unit 250 is to elastically couple the horizontal frame 230 and the vertical frame 210 to each other, the first elastic portion 251, the first coupling portion 253, and the second coupling A portion 255 may be included.

The first elastic part 251 is positioned between the vertical frame 210 and the horizontal frame 230 and may include one first elastic body 2511 made of rubber or resin material having elasticity. Here, the size of the first elastic body 2511 may be determined according to its elastic force and the user's pushing force. That is, the size of the first elastic body 2511 may be determined in a range in which the pushing force of the user falls within the range of the elastic force.

The first coupling part 253 couples one side of the first elastic part 251 to the vertical frame 210, and includes a first fastening member 2253 provided at one end of the first elastic body 2511 and a vertical frame. A coupling plate 2533 provided at the front of the 210 and having a first coupling hole 2533a formed thereon, and a first bolt 2535 fastened to the first coupling hole 2533a and the first fastening member 2253. It may include. Therefore, when the first bolt 2535 is screwed into the first coupling hole 2533a and the first fastening member 2253, one side of the vertical frame 210 and the first elastic body 2511 is engaged.

More specifically, the first fastening member 2531 is based on the first body 2531a and the first body 2531a made of a hard synthetic resin material integrally provided at one end of the first elastic body 2511. It may include a plurality of branches (2531b) branched to the first through-hole (2531c) formed in each of the plurality of branches (2531b). In addition, a second through hole 2533b may be further formed in the coupling plate 2533 to allow the first body 2531a to be inserted therein. Accordingly, the first body 2531a and the first elastic body 2511 are inserted through the second through hole 2533b at the rear of the coupling plate 2533, and the first bolt 2535 is the first of the branch 2253b. After being inserted through the through hole 2253c, when the screw is fastened to the first coupling hole 2533a, one side of the vertical frame 210 and the first elastic body 2511 is coupled.

Of course, as another example, if it is not necessary to consider the convenience of assembly (including convenience such as replacement parts later), even if the first coupling portion 253 having the above-described configuration is not used, the vertical frame 210 and the first One end of the first elastic body 2511 may be joined by an adhesive (not shown) or the like. As another example, even if the first coupling portion 253 having the above-described configuration is not used, when the vertical frame 210 is made of a metal material, the first elastic body 2511 is thermally fused to the vertical frame 210. It may be combined directly by.

The second coupling part 255 couples the other side of the first elastic part 251 to the horizontal frame 230, the second fastening member 2551 provided at the other end of the first elastic body 2511, and the horizontal frame. The coupling portion 2553 corresponding to the center of the 230 and the second coupling hole 2553a is formed, and the second bolt 2555 fastened to the second coupling hole 2553a and the second fastening member 2551. It may include. Therefore, when the second bolt 2555 is screwed into the second coupling hole 2553a and the second fastening member 2551, the other side of the horizontal frame 230 and the first elastic body 2511 are coupled to each other.

More specifically, the second fastening member 2551 may include a second body 2551a made of a hard synthetic resin material integrally provided at the other end of the first elastic body 2511, and an insert molding (2) on the second body 2551a. The first nut 2551b may be included. Therefore, when the second bolt 2555 is sequentially fastened to the first coupling hole 2533a and the first nut 2551b, the other side of the horizontal frame 230 and the first elastic body 2511 are coupled to each other.

Of course, as another example, if it is not necessary to consider the convenience of assembly (including convenience such as replacement parts later), even if the second coupling portion 255 having the above-described configuration is not used, the horizontal frame 230 and the first The other end of the first elastic body 2511 may be joined by an adhesive (not shown) or the like. As another example, even when the second coupling part 255 having the above-described configuration is not used, when the horizontal frame 230 is made of a metal material, the first elastic body 2511 is thermally fused to the horizontal frame 230. It may be combined by.

Operation of the back support device of the chair according to the second embodiment of the present invention is as follows.

As shown in FIG. 10, when the user sits on the seat (see “630” in FIG. 17), the pushing force acts in the direction of the arrow 1, and thus the first back plate 171 rotates clockwise in the drawing. The second back plate 172 rotates counterclockwise in the drawing. And, when the user twists the upper body of the body in the direction of the arrow 2, the pushing force acts in the direction of the arrow 2, the pushing force is a horizontal frame 230 elastically supported by the vertical frame 210 to FIG. Since it is rotated counterclockwise based on the reference, the user's back is rotated counterclockwise with reference to FIG. 10 with the horizontal frame 230 while maintaining the first and second back plates 171 and 172 in close contact. . At the same time, when the back of the chair is seen from the rear of the chair, the horizontal frame 230 elastically supported by the vertical frame 210 according to the movement of the upper body of the user is counterclockwise based on the drawing (see FIG. 7). Direction of rotation (see “130” in FIG. 7).

Therefore, as described above, when the user is seated on the seat (refer to "630" in FIG. 17), the back is completely in close contact with the first and second back plates 171 and 172, while maintaining such close contact. According to the movement of the user can freely move the back.

11 and 12, the back support device of the chair according to the third embodiment of the present invention will be described.

11 is a cross-sectional view showing a back support device of a chair according to a third embodiment of the present invention, Figure 12 is a cross-sectional view showing an operating state of the back support device of a chair according to a third embodiment of the present invention.

The back support device of the chair according to the third embodiment of the present invention is the same as the first embodiment of the present invention described above, except for the second coupling unit 390, as shown in FIG. In the third embodiment of the present invention, the second coupling unit 390 will be described in detail.

Hereinafter, the second coupling unit 390 will be described in detail with reference to FIG. 11.

The second coupling unit 390 elastically couples the first and second back plates 371 and 372 (hereinafter referred to as "back plates") to the horizontal frame 330, respectively, and the second elastic part 391. ), A third coupling portion 393, and a fourth coupling portion 395.

The second elastic part 391 is positioned between the horizontal frame 330 and the back plate 370, and includes a leaf spring 3911 made of a metallic material having elasticity, and one side of the leaf spring 3911 being bent. The bending portion 3913 and the second bending portion 3915 on which the other side of the leaf spring 3911 may be bent may be included.

The third coupling part 393 couples one side of the second elastic part 391 to the horizontal frame 330, and includes a first fastening hole 3913 formed in the first bent portion 3913 and a horizontal frame ( The third coupling hole 3932 formed in the front of the 330, and the third coupling hole 3932 and the third bolt (3933) fastened to the first fastening hole (3931). Accordingly, when the third bolt 3333 is screwed into the third coupling hole 3932 and the first coupling hole 3929, one side of the horizontal frame 330 and the first bent portion 3913 may be coupled to each other.

Of course, as another example, if it is not necessary to consider the convenience of assembly (including convenience such as replacement parts later), even if the third coupling portion 393 having the above-described configuration is not used, the horizontal frame 330 and the first One bent portion 3913 may be joined by an adhesive or the like. As another example, even when the third coupling portion 393 having the above-described configuration is not used, when the horizontal frame 330 is made of a metal material, the first bent portion 3913 is attached to the horizontal frame 330. It may be combined by welding or the like.

The fourth coupling part 395 couples the other side of the second elastic part 391 to the back plate 370, and includes a second fastening hole 3951 formed in the second bent portion 3915 and the back plate 370. It may include a fourth coupling hole (3953) formed on the back of the fourth coupling hole (3953) and the fourth bolt (3955) fastened to the second coupling hole (3951). Therefore, when the fourth bolt 3955 is screwed into the second fastening hole 3951 and the fourth coupling hole 3953, the back plate 370 and the second bent portion 3915 are coupled to each other.

Furthermore, the second coupling unit 390 is positioned between the fourth coupling portion 395 and the second bending portion 3915, and the third through hole 3971 is formed to allow the fourth bolt 3955 to be inserted therein. It may further include a correction member (397). This position correction member 397 can have the effect for the following reasons. When the back surface of the back plate 370 has a round shape, the back surface of the back plate 370 and the second bent portion 3915 of the flat plate spring 3911 may have difficulty in surface contact with each other. Accordingly, when the position correcting member 397 (one surface is round and the other surface is a flat volume member) is positioned therebetween, the leaf spring 3911 can be accurately positioned on the back plate 370 while the surface contact is made accurately. have.

Furthermore, it may be more preferable that the second bent portion 3915 is bent toward the center of the horizontal frame 330 along the length direction of the horizontal frame 330. The reason is that when the user sits on the chair, the first back plate 371 and the second back plate 372 are clockwise or counterclockwise toward the center of the horizontal frame 330 relative to each leaf spring 3911. This is because the user's back can be smoothly wrapped by the first back plate 371 and the second back plate 372 rotated in this way.

Of course, as another example, if it is not necessary to consider the convenience of assembly (including convenience such as replacement parts later), the second bent portion 3915 even if the fourth coupling portion 395 having the above-described configuration is not used. The back plate 370 may be coupled by an adhesive or the like. As another example, even when the fourth coupling part 395 having the above-described configuration is not used, when the back surface of the back plate 370 is made of a metal material, the second bent portion 3915 is the back surface of the back plate 370. It may be combined by welding or the like.

Operation of the back support device of the chair according to the third embodiment of the present invention is as follows.

As shown in FIG. 12, when the user sits on the left portion (see “630” in FIG. 17), the pushing force acts in the direction of the arrow 1, and thus the first back plate 371 rotates clockwise in the drawing. The second back plate 372 rotates counterclockwise in the drawing. And, when the user twists the upper body of the body in the direction of the arrow 2, the pushing force acts in the direction of the arrow 2, this pushing force is shown in Figure 12 the horizontal frame 330 elastically supported by the vertical frame (110) Since it is rotated counterclockwise with respect to the reference, the user's back is rotated counterclockwise with reference to FIG. 12 with the horizontal frame 330 while maintaining the first and second back plates 371 and 372 in close contact. . At the same time, when the back of the chair is viewed from the rear of the chair, the horizontal frame 330 elastically supported by the vertical frame 110 according to the movement of the upper body of the user is counterclockwise based on the drawing (see FIG. 7). Direction of rotation (see “330” in FIG. 7).

Therefore, as described above, when the user is seated on the seat (see "630" in FIG. 17), the back is completely in close contact with the first and second back plates 371 and 372, and then maintains such close contact. According to the movement of the user can freely move the back.

13 and 14, a back support device for a chair according to a fourth embodiment of the present invention will be described.

13 is a cross-sectional view showing a back support device of a chair according to a fourth embodiment of the present invention, Figure 14 is a cross-sectional view showing an operating state of the back support device of a chair according to a fourth embodiment of the present invention.

The back support device of the chair according to the fourth embodiment of the present invention is the same as the first embodiment of the present invention, except for the second coupling unit 490, as shown in FIG. In the fourth embodiment of the present invention, the second coupling unit 490 will be described in detail.

Hereinafter, the second coupling unit 490 will be described in detail with reference to FIG. 13.

The second coupling unit 490 elastically couples the first and second back plates 471 and 472 (hereinafter referred to as “back plates”) to the horizontal frame 430, respectively. A part that is partially cut and bent from the horizontal frame 430, a first bent portion 493 in which one side of the piece 491 is bent and a first fastening hole 4913 is formed, and the back plate. The third coupling hole 495 formed on the rear surface of the 470 and the third bolt 496 fastened to the third coupling hole 495 and the first coupling hole 4913 may be included. Accordingly, the section 491 cut and bent in the horizontal frame 430 serves as an elastic body, and the third bolt 496 is screwed into the first fastening hole 4913 and the third coupling hole 495. The back plate 470 and the first bent portion 493 are coupled to each other. In particular, since the section 491 of the horizontal frame 430 is used as the elastic body, it may have an advantage that it is not necessary to provide a separate coupling means.

Furthermore, the second coupling unit 490 is positioned between the third coupling hole 495 side of the back plate 470 and the first bent portion 493, and allows the third bolt 496 to be inserted into the third through hole. It may further include a position correction member 497 is formed. This position correction member 497 can have the effect for the following reasons. When the back surface of the back plate 470 has a round shape, the back surface of the back plate 470 and the first bent portion 493 of the flat section 491 may have difficulty in surface contact with each other. Accordingly, when the position correction member 497 (one surface is round and the other surface is a flat volume member) is positioned therebetween, the first bent portion 493 is placed on the back surface of the back plate 470 while the surface contact is made accurately. Can be accurately positioned.

Furthermore, the first bent portion 493 may be more preferably bent toward the center of the horizontal frame 430 along the length direction of the horizontal frame 430. The reason for this is that when the user sits on the chair, the first back plate 471 and the second back plate 472 smoothly clockwise and counterclockwise toward the center of the horizontal frame 430 with respect to the respective segments 491. Since the user's back can be smoothly wrapped by the first and second back plates 471 and 472 rotated in this way.

Of course, as another example, if it is not necessary to consider the convenience of assembly (including convenience of replacement of parts later), the first bent portion 493 and the back plate 470 may be made of adhesive or the like even if the above-described coupling parts are not necessarily used. It may be combined by. As another example, even when the coupling parts described above are not used, when the back surface of the back plate 470 is made of a metal material, the first bent portion 493 may be joined to the back surface of the back plate 470 by welding or the like. will be.

Operation of the back support device of the chair according to the fourth embodiment of the present invention is as follows.

As shown in FIG. 14, when the user sits on the left side (see “630” of FIG. 17), the pushing force acts in the direction of the arrow 1, so that the first back plate 471 rotates clockwise in the drawing. The second back plate 472 rotates counterclockwise in the drawing. Then, when the user twists the upper body of the body in the direction of the arrow 2, the pushing force acts in the direction of the arrow 2, and this pushing force is a horizontal frame 430 elastically supported by the vertical frame 110 to FIG. Since it is rotated counterclockwise based on the reference, the user's back is rotated counterclockwise with reference to FIG. 14 with the horizontal frame 430 while maintaining the first and second back plates 471 and 472 in close contact. . At the same time, when the back of the chair is seen from the rear of the chair, the horizontal frame 430 elastically supported by the vertical frame 110 according to the movement of the upper body of the user is counterclockwise based on the drawing (see FIG. 7). Direction of rotation (see "130" in Fig. 7).

Therefore, as described above, when the user is seated on the seat (see " 630 " in Fig. 17), the back is completely in close contact with the first and second back plates 471 and 472, while maintaining such close contact. According to the movement of the user can freely move the back.

15 and 16, a back support device for a chair according to a fifth embodiment of the present invention will be described.

15 is a cross-sectional view showing a back support device of a chair according to a fifth embodiment of the present invention, Figure 16 is a cross-sectional view showing an operating state of the back support device of a chair according to a fifth embodiment of the present invention.

As shown in FIG. 15, the back support device of the chair according to the fifth embodiment of the present invention is elastically coupled to the vertical frame 510 by the first coupling unit 550 to the vertical frame 510. The horizontal frame 530 and at least two back plates 570 elastically coupled to the horizontal frame 530 by the second coupling unit 590.

The vertical frame 510 is positioned perpendicular to the back of the chair (see FIG. 17 or FIG. 18) and may be mounted to the seat of the chair (see “710” in FIG. 18), and the base (“610” in FIG. 17). It may also be mounted on the base if it is of a type having a position (located below the seat to support the seat and, if necessary, mounted with a tilting device, etc.). Of course, the vertical frame 510 may be detachably mounted to the seat or base of the chair for ease of assembly.

The horizontal frame 530 is positioned to cross the vertical frame 510 and is elastically coupled to the vertical frame 510.

At least two back plates 570 include a first back plate 571 and a second back plate 572, and the first back plate 571 and the second back plate 572 are elastically coupled to the horizontal frame 530. . In detail, the first back plate 571 is positioned at the left side with respect to the center of the horizontal frame 530, and the second back plate 572 is positioned at the right side with respect to the center of the horizontal frame 530.

Further, in order to secure more contact surfaces with the back of the user, the cross sections of each of the first and second back plates 571 and 572 may be concave rounded to the rear of the chair. In other words, when viewed from the front of each back, the shape of the contact line lying in the horizontal direction among the virtual surface contact lines is concave into the rear of the chair, and the concave shape is in the longitudinal direction of the center of each back. It can be formed symmetrically or asymmetrically based on the contact line that lies.

Furthermore, in order to properly support the lumbar spine of the user, longitudinal sections of each of the first and second back plates 571 and 572 may be convexly rounded toward the front of the chair. In other words, when the back plate 570 is viewed from the front, the shape of the contact line lying in the vertical direction among the virtual surface contact lines is convex protruding toward the front of the chair, and in particular, the contact line lying in the vertical direction is As a first example, the center section may have a round shape, such as the upper section and the lower section, and have a convex shape as a whole, and as a second example, the center section may have a straight shape (“L” in FIG. 4). The upper section and the lower section may be inclined to the rear of the chair to have a convex shape as a whole (see FIG. 4). Therefore, according to the first and second examples, the upper part convex in each back plate 570 can support the load of the upper body of the user to reduce the load on the lumbar spine, and the lower part convex in each back plate 570 is the user's pelvis part. Close to the stress can relieve the stress. In addition, it is preferable that the convexity of the longitudinally placed contact line is greater in the portion closer to the user's side (see FIG. 5) than in the portion closer to the user's spine, and further, the portion closer to the user's spine is overall. It may be formed to be almost flat.

Therefore, according to the back support apparatus of the chair according to the fifth embodiment of the present invention, since the first and second back plates 571 and 572 and the horizontal frame 530 are elastically coupled, When the seat is seated (see "630" in Fig. 17), the back is completely in contact with the first and second back plates 571 and 572. Secondly, since the horizontal frame 530 and the vertical frame 510 are elastically coupled, it is possible to freely move the back according to the user's movement while maintaining such close contact.

Hereinafter, the first coupling unit 550 will be described in detail with reference to FIG. 15.

The first coupling unit 550 elastically couples the horizontal frame 530 and the vertical frame 510 to each other. The first coupling unit 550 is provided at a front side of the vertical frame 510 and is positioned at a rear side of the horizontal frame 530. A horizontal plate 551 having a shape of 530, a clip 553 provided at the front of the horizontal plate 551, and having a circular first insertion groove 5531 formed thereon, and a rear surface of the horizontal frame 530. And are provided between the spherical first hinge 555 and the horizontal frame 530 and the horizontal plate 551, which are inserted into the first insertion grooves 5531, respectively, on both sides of the first hinge 555. The first elastic body 557 may be included. Therefore, after the first elastic body 557 is positioned between the horizontal plate 551 and the horizontal frame 530 provided in the vertical frame 510, the first hinge 555 of the horizontal frame 530 is moved to the horizontal plate ( When inserted into the first insertion groove 5531 of the 551, the vertical frame 510 and the horizontal frame 530 is rotatably coupled to each other.

Furthermore, it may be preferable that the first elastic body 557 is made of a rubber material and has a dupe shape in which an air layer is formed therein. This is because the primary elastic force by the rubber material and the secondary elastic force by the air layer is generated because it may be advantageous in terms of securing the elastic force.

Furthermore, the first elastic body 557 may be provided in plural on both sides of the first hinge 555. Here, the number of the first elastic bodies 557 may be determined according to the elastic force and the pushing force of the user. That is, the number of the first elastic bodies 557 may be determined in a range in which the pushing force of the user falls within the range of the elastic force. That is, the number of the first elastic bodies 557 may be determined in a range in which the pushing force of the user falls within the range of the elastic force.

Hereinafter, referring to FIG. 15 again, the second coupling unit 590 will be described in detail.

The second coupling unit 590 elastically couples the first and second back plates 571 and 572 (hereinafter referred to as “back plates”) to the horizontal frame 530, respectively. The insertion portion 591 is provided in the front and the inner portion of the cone-shaped space (5911) and a circular second insertion groove (5912) in the center, and is provided on the back of the back plate 570 and the second insertion groove A spherical first hinge 555 inserted into the 5592 is positioned between a cone-shaped insertion member 593 formed at its end, and an inner circumferential surface of the insertion portion 591 and an outer circumferential surface of the insertion member 593. The second elastic body 595 may be included. Therefore, after the insertion member 593 provided in the back plate 570 is inserted into the space portion 5111 formed in the insertion portion 591 of the horizontal frame 530, the second hinge 5913 of the insertion member 593 is provided. Is inserted into the second insertion groove 5912 of the insertion unit 591, the back plate 570 and the horizontal frame 530 are rotatably coupled to each other.

Further, the second elastic body 595 may be made of a high elastic rubber material and adhered to the entire inner circumferential surface of the insertion part 591. Therefore, when the insertion member 593 is in close contact with the second elastic body 595, the second elastic body 595 may provide a smooth elastic force and a restoring force to the insertion member 593.

Operation of the back support device of the chair according to the fifth embodiment of the present invention is as follows.

As shown in FIG. 16, when the user sits on the seat (see “630” in FIG. 17), the pushing force acts in the direction of the arrow 1, and thus the first back plate 571 rotates clockwise in the drawing. The second back plate 572 rotates counterclockwise in the drawing. When the user twists the upper body of the body in the direction of the arrow 2, the pushing force acts in the direction of the arrow 2, and this pushing force causes the horizontal frame 530 elastically supported by the vertical frame 510 to FIG. Since the reference is rotated counterclockwise, the user's back rotates counterclockwise with reference to FIG. 16 with the horizontal frame 530 while maintaining a close contact with the first and second back plates 571 and 572. do. At the same time, when the back of the chair is viewed from the rear of the chair, the horizontal frame 530 elastically supported by the vertical frame 510 according to the movement of the upper body of the user is counterclockwise based on the drawing (see FIG. 7). Direction of rotation (see "130" in Fig. 7).

Therefore, as described above, when the user is seated on the seat (refer to "630" in FIG. 17), the back is completely in close contact with the first and second back plates 571 and 572, while maintaining such close contact. According to the movement of the user can freely move the back.

Meanwhile, the first coupling units 150, 250 and 550 mentioned in the first, second and fifth embodiments of the present invention described above are the first, second, third, fourth and fifth embodiments. May be used interchangeably with each other. Furthermore, the second coupling units 190, 390, 490 and 590 mentioned in the first, third, fourth and fifth embodiments of the present invention described above are also the first, second, third and third embodiments. It may be used in place of each other in the fourth and fifth embodiments.

On the other hand, Figure 17 is a side view showing a tilting chair to which the back support device according to the first embodiment of the present invention.

Chair according to an embodiment of the present invention is a type equipped with a base 610 (located below the seat to support the seat, a tilting device, etc., if necessary), as shown in Figure 17 Likewise, the base 610 includes a base portion 610, a seat portion 630 provided at an upper end of the base 610, and a support device 650 provided at the base 610 and positioned behind the seat portion 630.

The back support device 650 includes a vertical frame 110 provided in the base 610, a horizontal frame 130 elastically coupled to the vertical frame 110 by the first coupling unit 150, and horizontally. At least two back plates 170 are elastically coupled to the frame 130 by the second coupling unit 190.

Since the first coupling unit 150 and the second coupling unit 190 are the same as the back support device mentioned in the above-described embodiments, description thereof will be omitted.

On the other hand, Figure 18 is a side view showing a general chair to which the back support device according to the first embodiment of the present invention.

Chair according to another embodiment of the present invention, the base is not provided separately, as shown in Figure 18, the seat 710 and the back support device 730 is located behind the seat 710 ).

The back support device 730 includes a vertical frame 110 provided in the seat 710, a horizontal frame 130 elastically coupled to the vertical frame 110 by the first coupling unit 150, and horizontally. At least two back plates 170 are elastically coupled to the frame 130 by the second coupling unit 190.

Since the first coupling unit 150 and the second coupling unit 190 are the same as the back support device mentioned in the above-described embodiments, description thereof will be omitted.

As described above, the back support device of the chair according to various embodiments of the present invention may have the following effects.

According to the first, second, third, fourth and fifth embodiments of the present invention, the back can be freely moved in a state where the back is completely in contact with the plurality of backs according to the movement of the user, that is, the user Even if the back is leaned on the plurality of backs and moved to the left / right, the plurality of backs can move together with the back while being in close contact with the back, so that the weight that can be applied to one side of the waist can be evenly distributed. Ultimately, the strain on the back muscles can be prevented. In particular, in the PC room, office, or reading room, the upper body of the body in one direction can be prevented from going to the spine, even if it is maintained in Jiangxi.

Claims (26)

delete A vertical frame provided on the back of the chair, A horizontal frame elastically coupled to the vertical frame, and At least two backs elastically coupled to the horizontal frame, The vertical frame and the horizontal frame are elastically coupled to each other by a first coupling unit, and The first coupling unit A first elastic part located between the vertical frame and the horizontal frame; A first coupling part coupling one side of the first elastic part to the vertical frame, and A second coupling part for coupling the other side of the first elastic part to the horizontal frame; Back support device of a chair comprising a. In claim 2, The first elastic portion At least one first elastic body made of a rubber or resin material having elasticity, The first coupling portion A first fastening member provided at one end of the at least one first elastic body, A coupling plate provided on the front of the vertical frame and having at least one first coupling hole formed therein, and At least one first bolt fastened to the at least one first coupling hole and the first fastening member of the at least one first elastic body, and The second coupling portion A second fastening member provided at the other end of the at least one first elastic body, A coupling part corresponding to the center of the horizontal frame and having at least one second coupling hole formed therein; And at least one second bolt fastened to the at least one second coupling hole and the second fastening member of the at least one first elastic body. In claim 2, The first elastic portion One first elastic body made of rubber or resin material having elasticity, The first coupling portion At least one first fastening member provided at one end of the first elastic body, and A coupling plate provided on the front of the vertical frame and having at least one first coupling hole formed therein, and At least one first bolt fastened to the at least one first coupling hole and the at least one first fastening member, and The second coupling portion At least one second fastening member provided at the other end of the first elastic body, A coupling part corresponding to the center of the horizontal frame and having at least one second coupling hole formed therein; And at least one second bolt fastened to the at least one second coupling hole and the at least one second fastening member. A vertical frame provided on the back of the chair, A horizontal frame elastically coupled to the vertical frame, and At least two backs elastically coupled to the horizontal frame, The vertical frame and the horizontal frame are elastically coupled to each other by a first coupling unit, and The first coupling unit A horizontal plate provided at a front side of the vertical frame and positioned at a rear surface of the horizontal frame, the horizontal plate having a shape of the horizontal frame; A clip provided at the front of the horizontal plate and having a circular first insertion groove; A spherical first hinge provided on the rear surface of the horizontal frame and inserted into the first insertion groove, and And a first elastic body provided between the horizontal frame and the horizontal plate, the first elastic body being provided on both sides of the first hinge. In claim 5, The first elastic body is made of a rubber material and the back support device of the chair having a dupe shape with an air layer formed therein. A vertical frame provided on the back of the chair, A horizontal frame elastically coupled to the vertical frame, and At least two backs elastically coupled to the horizontal frame, The vertical frame and the horizontal frame are elastically coupled by an elastic material made of rubber, and When the vertical frame and the horizontal frame is made of a metal material, One end of the elastic body is joined by heat fusion to the vertical frame, and The other end of the elastic body is the back support device of the chair coupled to the horizontal frame by heat welding. The method according to any one of claims 2 to 7, Each of the at least two back plates is elastically coupled to each other by a second coupling unit to the horizontal frame, and The second coupling unit A second elastic part located between the horizontal frame and the back plate; A third coupling part for coupling one side of the second elastic part to the horizontal frame, and A fourth coupling part for coupling the other side of the second elastic part to the back plate Back support device of a chair comprising a. In claim 8, The second elastic portion A second elastic body made of rubber or resin material having elasticity, wherein the third coupling portion A third fastening member provided at one end of the second elastic body, A third coupling hole formed in the front of the horizontal frame, and A third bolt fastened to the third coupling hole and the third fastening member, and The fourth coupling portion A fourth fastening member provided at the other end of the second elastic body, A fourth coupling hole formed on the back surface of the back plate, and And a fourth bolt fastened to the fourth coupling hole and the fourth fastening member. In claim 8, The second elastic portion A leaf spring made of an elastic metal material, A first bent portion at which one side of the leaf spring is bent, and The other side of the leaf spring includes a bent second bent portion, and The third coupling portion A first fastening hole formed in the first bent portion; A third coupling hole formed in the front of the horizontal frame, and A third bolt fastened to the third coupling hole and the first coupling hole, The fourth coupling portion A second fastening hole formed at the second bent portion; A fourth coupling hole formed on the back surface of the back plate, and Back support device of the chair including a fourth bolt fastened to the fourth coupling hole and the second coupling hole. In claim 10, The second coupling unit And a position correcting member positioned between the fourth coupling portion and the second bent portion and having a through hole formed therein so that the fourth bolt can be inserted therein. In claim 11, And the second bent portion is bent toward the center of the horizontal frame along a longitudinal direction of the horizontal frame. The method according to any one of claims 2 to 7, Each of the at least two back plates is elastically coupled to each other by a second coupling unit to the horizontal frame, and The second coupling unit A section cut out of the horizontal frame to be bent from the horizontal frame; A first bent portion in which one side of the segment is bent and a first fastening hole is formed therein; A third coupling hole formed on the back surface of the back plate, and Back support device of a chair including a third bolt that is fastened to the third coupling hole and the first fastening hole. In claim 13, And a position correcting member positioned between the third coupling hole and the first bent portion and having a through hole formed therein so that the third bolt can be inserted therein. The method of claim 14, And the first bent portion is bent toward the center of the horizontal frame along a longitudinal direction of the horizontal frame. The method according to any one of claims 2 to 7, Each of the at least two back plates is elastically coupled to each other by a second coupling unit to the horizontal frame, and The second coupling unit An insertion portion provided at a front side of the horizontal frame and having a cone-shaped space portion and a circular second insertion groove formed at a center thereof; A cone-shaped inserting member provided on the back surface of the back plate and having a spherical second hinge inserted into the second insertion groove formed at an end thereof; and And a second elastic body positioned between an inner circumferential surface of the insertion portion and an outer circumferential surface of the insertion member. The method according to any one of claims 2 to 7, The at least two back plates and the horizontal frame are elastically coupled by an elastic material made of rubber, and When the back of the at least two back plate and the horizontal frame is made of a metal material, One end of the elastic body is joined by heat fusion to the horizontal frame, and The other end of the elastic body is the back support device of the chair coupled to the back of each of the at least two back plate by heat fusion. delete delete delete The method according to any one of claims 2 to 7, The at least two back plates include a first back plate and a second back plate respectively provided on the left and right sides of the horizontal frame, and And a cross section of each of the first and second back plates is concave to the rear of the chair. The method of claim 21, Longitudinal sections of each of the first and second backplates have a convex shape toward the front of the chair. The method of claim 22, The back support device of the chair that the surface of the set section of the longitudinal section of each of the first and second back plate has a straight shape. The method of claim 23, The back support device of the chair of the longitudinal section of each of the longitudinal section of the first and second back plate that the user's flank touches the convexity is larger than the other sections. A vertical frame provided on the back of the chair, A horizontal frame elastically coupled to the vertical frame, and At least two backs elastically coupled to the horizontal frame, Each of the at least two back plates is elastically coupled to each other by a second coupling unit to the horizontal frame, and The second coupling unit A section cut out of the horizontal frame to be bent from the horizontal frame; A first bent portion in which one side of the segment is bent and a first fastening hole is formed therein; A third coupling hole formed on the back surface of the back plate, and Back support device of a chair including a third bolt that is fastened to the third coupling hole and the first fastening hole. A vertical frame provided on the back of the chair, A horizontal frame elastically coupled to the vertical frame, and At least two backs elastically coupled to the horizontal frame, Each of the at least two back plates is elastically coupled to each other by a second coupling unit to the horizontal frame, and The second coupling unit An insertion portion provided at a front side of the horizontal frame and having a cone-shaped space portion and a circular second insertion groove formed at a center thereof; A cone-shaped inserting member provided on the back surface of the back plate and having a spherical second hinge inserted into the second insertion groove formed at an end thereof; and And a second elastic body positioned between an inner circumferential surface of the insertion portion and an outer circumferential surface of the insertion member.

Images