KR101852110B1 - A chair with flexible backrest - Google Patents

Abstract

The present invention relates to a chair with a flexible backrest. An objective of the present invention is to provide a chair with a flexible backrest which allows an upper end portion of a backrest to be connected and installed on a back post to be rotated by a rotating unit to variously change a shape when the backrest is rotated around the rotating unit by the movement of a user to elastically support the body of the user. The chair with a flexible backrest comprises: a seat unit connected to a support unit; a back post whose lower end is fixed on the support unit; and a backrest wherein the center of an upper end thereof is connected to an upper end of the back post by a rotating unit, and both sides of a lower end thereof are coupled to the back post. The backrest can horizontally rotate and change a shape around the rotating unit by the body movement of a user.

Description

A chair with flexible backrest < RTI ID = 0.0 >

A chair having a flexible back plate, wherein the back plate and the back post are supported by three points in a triangular shape, and the upper end of the back plate is assembled to the back post as a shaft type by the rotation part, The present invention relates to a chair provided with a flexible back plate capable of being freely rotated and deformed in the lateral direction.

BACKGROUND ART [0002] Generally, a chair includes a seat portion for supporting most of the body weight when the user is seated, a back plate portion which is erected so as to be positioned at the rear end of the seat portion and supports the back portion of the user, Today, modern people spend most of their time awake in their chairs with work, rest, learning, eating and talking, and the chair is one of the essential tools for modern people to live in everyday life. have.

In particular, students, office workers, researchers, etc. spend most of their working time sitting in their chairs, and as the hours of sitting and living are increased, chairs are moved beyond the level of tools to simply sit or support the body, It is being reborn as a household with various functions that can relieve tension and fatigue and provide psychological stability and satisfaction.

The chair which is conventionally used includes a tilting means having elasticity to rotate the seat portion and the back plate so as to be tilted at a predetermined angle in the backward direction, a height adjusting means for adjusting the height of the seat portion and the armrest, And a moving means for enabling movement by a wheel. By the addition of such a function, the body of the chair user can be kept as comfortable as possible, and the stretching for relieving fatigue and stress, .

However, since the conventional chair has a shape in which the back plate is elastically restored, when the user is not able to support various movements, the user may experience uncomfortable fatigue when the user is kept in the seating state for a long period of time.

That is, the user does not move only in the back and forth direction and the left and right direction in the sitting state of the chair, but tilts or moves his / her body biased in one direction after the one side and rotates the face and the upper body in the backward direction A variety of upper body movements such as stretching a hand or biting the body for picking up an article positioned in the rear single direction are generated. However, the conventional chair backing section has a function of supporting a back part of a seated user or having only a tilting function So that it is impossible to support the user's body according to various movements of the user. As a result, fatigue of the user is increased.

Patent Registration No. 10-1505666 (2015.03.18) Registration Utility Model Registration No. 20-0395903 (September 10, 2005) Public utility model publication public number 20-2012-0004909 (July 6, 2012) Patent Registration No. 10-1523722 (May 5, 2015)

An object of the present invention is to provide a back post which is connected to a back post of a back part of a back part by a rotation part and which can change its shape variously when the back part is rotated around the rotation part according to a user's movement, And a chair provided with a flexible back plate.

The present invention includes a seat portion connected to a support portion, a back post having a lower end fixed to the support portion, and a back plate portion having an upper center connected to the upper end of the back post by the rotation portion and a lower end connected to the back post, And the back plate is rotated and deformed in the left-right direction around the rotation part according to the body movement of the user.

In the present invention, the back plate and the back post are supported by three points in a triangular shape, and the upper end of the back plate is assembled to the back post as a shaft type by the rotation part so that the back plate can be rotated and deformed in the left- have.

Particularly, in the present invention, when a user looks back while sitting on a seat portion, or when a movement such as rotating the body to extend the hand in a backward direction is generated, the back plate is rotated about the rotation portion, The shape of the back plate portion is changed according to the user's body (back portion), so that the user can stably support the body.

Since the back plate is deformed and elastically restored independently and adaptively according to the movement and the load distribution of the seated person generated in a complex direction, various movements of the user can be elastically supported in various angles, thereby relieving the fatigue, And has the effect of comforting.

In the present invention, since the back plate is independently restrained without being restrained by the seat part, the upper body of the user can be rotated by holding the arm support provided on the chair, thereby releasing the muscles of the user's side, It can enhance the strength of the waist as well as improve.

In addition, the present invention can freely twist the upper body in a state where the back part of the user is in contact with the back plate, thereby releasing the rigid muscles such as the waist and back to improve the flexibility of the waist, There is an effect to strengthen. Particularly, since the back plate is deformed together with the present invention, the waist and abdominal momentum of the user can be increased.

Since the back plate and the back post are connected to each other by the fitting method, the present invention can be quickly assembled without a separate assembly tool.

The present invention is characterized in that the rotating part is constituted by a rotation axis and a departure prevention part, and a top stopping jaw is formed in the releasing part, so that the insertion of the backing part into the multi-stage coupling hole formed in the backrotating link is facilitated, The separation of the rotation shaft and the releasing restraint does not occur, so that the back plate can be stably rotated about the rotation portion.

In the present invention, the elastic stopper portions are further provided on both sides of the rotary portion, so that the rotation angle of the back plate about the rotary portion is restricted, the impact and noise generated during rotation are absorbed and projected, The bumper resilience of the part quickly returns to the home position, and the user's body is continuously supported.

The present invention is configured such that the back plate and the back post are one-touch coupled by the twist portion, so that not only the assembling property is improved but also the left and right twist movements of the back plate can be smoothly performed.

1 is an exemplary view showing a chair configuration according to the present invention;
Fig. 2 is an exemplary view showing a configuration of a back plate and a back post according to the present invention
3 is an exemplary view showing an assembly state of a back plate and a back post according to the present invention.
4 is a front view showing an assembled state of the back plate and the back post according to the present invention.
Fig. 5 is an example showing an AA sectional structure of Fig. 4
FIG. 6 is an exemplary view showing a configuration of a rotating portion according to the present invention.
7 is an exemplary view showing a configuration of a releasing chamber of a rotating part according to the present invention
FIG. 8 is an exemplary view showing a configuration of a backrotating link according to the present invention. FIG.
9 is an exemplary view (including an elastic stopper part) showing a configuration of a rotating part according to the present invention;
10 is an exemplary view showing the bumper structure of the elastic stopper portion according to the present invention
11 is an exemplary view showing an operating state of the elastic stopper portion according to the present invention
Fig. 12 is an exemplary diagram showing the BB sectional configuration of Fig. 4
13 is an exemplary view showing an operating state of a twisted portion according to the present invention;
FIG. 14 is an exemplary view showing a state of a deformation (rotation / twist sheet) of a back plate according to the present invention
15 is an exemplary view showing a tilting operation state of the back plate according to the present invention

FIG. 3 is a perspective view showing the assembled state of the back plate and the back post according to the present invention. FIG. 5 is a perspective view of the back panel according to the present invention. Fig. 4 is an exemplary front view showing the assembled state of the back plate and the back post according to the present invention, Fig. 5 is an exemplary view showing an AA sectional structure of Fig. 4, Fig. FIG. 8 is a view showing the structure of a backrotating link according to the present invention. FIG. 9 is a view showing an example of a backrotating link according to the present invention. FIG. 10 is an exemplary view showing the configuration of a bumper of the elastic stopper according to the present invention, and FIG. 11 is a view showing an operation state of the elastic stopper according to the present invention. Fig. 12 is a cross-sectional view taken along line BB in Fig. 4 FIG. 13 is an exemplary view showing an operating state of a twisted portion according to the present invention, and FIG. 14 is a view showing an example of a deformation (rotation / twisted sheet) state of a back plate according to the present invention,

The present invention relates to an apparatus and a method for manufacturing the same which are provided with a support portion 10, a seat portion 20 connected to the support portion 10, a back post 30 having a lower end fixed to the support portion 10, And a back plate 30 connected to an upper end of the back post 30 and having both lower ends coupled to the back post 30 so that the back plate 30 can be rotated around the rotation part 40, Is rotated and deformed in the left and right direction.

That is, in the chair 100 having the flexible backboard according to the present invention, the backboard part 60 and the back post 30 are supported in triangular shape by being supported by three points, and the upper end of the backboard part is supported by the rotation part 40 When the force is applied to the back plate 60 by the user in the left and right directions, both upper end portions of the back plate 60 around the rotation portion 40 are engaged with the back plate 30 60 in the left and right direction.

For example, when a user's body movements (the user's shoulders are largely rotated in the backward direction and the user's waist is rotated in a simple manner) while twisting the upper body in a state of being seated on a chair, The back side upper half portion 65 of the back side upper portion rotates (rotates) at the center (one point) according to the movement of the body so that a large amount of deformation occurs and both sides (two points) So that the body of the user can be stably resiliently supported by the left and right rotation and twist (twist operation) while supporting the waist portion or the back lower portion of the user.

1, the support portion 10 supports the seat portion 20 and the back plate portion 60 at a predetermined height from the floor surface. The seat portion 20 is connected to the upper side, (30) is fixed to one side.

The supporting portion 10 may further include a rotating means 11 for rotating the seat portion 20, the back post 30 and the back plate portion 60, Can be installed. That is, the supporting unit 10 may be configured such that the rotating unit 11 is integrally connected and the seat unit 20, the back plate unit 60, and the armrest 12 are connected to the rotating unit 11 .

In addition, the supporting unit 10 may be configured to have a mobility such that a moving unit 14 having a plurality of rotating wheels 13 is connected to the lower end thereof.

The support portion 10 may further include a tilting means 15. The back post 30 may be connected to the tilting means 15 so that the back post 30 can be tilted in multiple stages have.

The configuration of the rotating unit 11, the moving unit 14, the tilting unit 15, and the supporting unit 10 including the rotating unit 11, the tilting unit 15, and the supporting unit 10 can be well known. A detailed description thereof will be omitted.

The seat portion 20 is for seating the user and is connected to the upper side of the support portion 10 as shown in Fig. 1, and is usually configured to have a predetermined cushioning feeling.

2, the back post 30 includes an upper post 31 connected to the back plate 60 by the rotation unit 40, and an upper post 31 formed integrally with the upper post 31, A shaft hole 34 is formed at a predetermined depth to connect the rotary part 40 to the upper surface 33 of the upper post 31 .

Although the shape of the back post 30 constructed as described above is not specified, for example, as shown in the figure, the two lower posts 32 are branched so as to be symmetrical about one upper post 31 The back post 30 supports the back plate 60 in a triangular shape (supports three points), so that the back part of the back post 30 is supported by the back part of the user, So that the tilt can be freely performed and the upper both side portions 65 of the back plate 60 are not fixed so that a predetermined degree of freedom is provided. 60 can be freely deformed.

The back post 30 may be formed so that the lower ends of the lower posts 32 are integrally connected by the connection posts 36. When the support posts 10 are provided with the connection posts 36, A connection post 36 is connected and connected. That is, the upper end of the lower post 32 is connected by the upper post 31 and the lower end of the lower post 32 is connected by the connection post 36 to form a diamond As shown in FIG.

That is, when the back post 30 is provided with the connection post 36, the connection post 36 is inserted and fixed into the support part 10, so that the back post 30 can be assembled with respect to the support part 10 And the supporting force is improved.

The back post 30 has a bent shape such that the lower post 32 is bent backward in the backward direction B of the chair and curved downward in the direction of the support portion, Can be formed so as to have a predetermined elastic force in the backward unidirectional (B) direction.

2, the back plate 60 includes a back plate 61 for supporting a back portion of the user, a back plate 60 coupled to the back top 30 of the back plate 30, And a rotation link 62.

The back plate 61 is made of a flexible material having a predetermined elastic restoring force while stably supporting the back portion of the user.

The back panel 61 may be formed of one panel or may be configured to have elasticity by connecting a mesh net to the back panel frame or may be formed of cloth or fabric having a predetermined cushioning material, To be smooth and flexible.

The back plate 61 may further include a plurality of slit holes 69. The slit holes 69 are formed in the longitudinal direction to impart air permeability and improve the self- Respectively.

2, 6, and 8, the backlit link 62 includes a multi-stage engagement hole 64 opened downward on a lower surface 63 that is in contact with and supported by a top surface 33 of the back post The multi-stage coupling hole 64 has a main coupling hole 66 and an engagement hole 67 formed in the main coupling hole 66 and having an inner diameter larger than the inner diameter of the main coupling hole 66 .

8, a communication hole 68 for improving the disassembly / assembling property of the rotary part 40 is formed on one side of the backlit link 62, which faces the back plate 61, 64, respectively.

The backlit link 62 constructed as described above may be integrally formed with the back plate 61 or may be formed separately from the back plate 61 as shown in the figure and may be formed by fitting or bolt- And can be integrally fixed and installed.

The rotary part 40 connects the backrest rotary link 61 to the upper post 31 of the back post in a shaft type so that the backrest part 60 can be rotated in the lateral direction with respect to the back post 30, A rotary shaft 41 inserted into the shaft hole 34 of the back post and the multi-stage coupling hole 64 of the backrotate link, as shown in Figs. 2, 5 and 6, And an escape region 43 which is installed and inserted into the multi-stage engagement hole 64 of the backlit link.

The rotation shaft 41 is assembled to the back post 30 and serves as a shaft for rotating the back plate 60. The rotation shaft 41 has a predetermined length and is inserted into the shaft hole 34 of the back post And a head 41b integrally formed with the body 41a and the head 41b is formed to have a larger diameter than the body 41a.

As shown in FIG. 7, the release channel 43 is provided to prevent the back plate 30 from being separated from the back post 30. The through hole 44 is formed in the back- A cutout groove 45 is formed in the longitudinal direction so as to communicate with the through hole 44 at one side and a catching protrusion 47 is formed to protrude along the circumference of the outer face 46.

The locking protrusion 47 is configured such that the projection upper end face 48 has a predetermined inclined face with respect to the outer face 46 and the lower projection face 49 has a rectangular face with respect to the outer face 46 .

When the rotary shaft 41 is inserted into the through hole 44, the separation chamber 43 is formed of a material having a predetermined elastic force and is provided with a cutout groove 45 in the longitudinal direction. And the inner surface 43b is brought into close contact with the body 41a. That is, the release reservoir 43 is installed so as to surround the rotating shaft body 41a, and the upper surface 43a is brought into contact with the head 41b of the rotating shaft so as to be prevented from being separated from the rotating shaft in the head direction.

The release claw 43 is made of a material having a predetermined elasticity and has a function of preventing generation of noise due to friction when the back plate 60 is rotated around the rotation axis 41 do. Particularly, the release claw 43 has a flange 43c protruding from the back post upper surface 33 so that when the back plate 60 is rotated in the left and right direction, .

9, the rotation unit 40 may further include an elastic stopper unit 70. The elastic stopper unit 70 may include a back plate 60 around the rotation unit 40 A function of restricting the rotation angle of the back plate when the left and right rotation is performed, and a function of restoring the rotated back plate 60 to the original position.

10, the elastic stopper portion 70 includes a bumper 71 made of an elastic body, a stopper protrusion 76 protruding from the upper end surface 33 of the back post so that the bumper 71 is fitted into the bumper 71, And a bumper hole 77 formed in the lower end surface 63 of the backrotate link 62 so that the bumper 71 is inserted into contact therewith.

The bumper 71 is integrally formed on both sides of the central bumper 72 so as to have an interspace 73 between the central bumper 72 to which the stopper projection 76 is fitted, And a side bumper (74). That is, the bumper 71 has a central bumper 72 and a side bumper 74 integrally formed therebetween, and a space 73 is formed between the central bumper 72 and the side bumper 74, A protrusion hole 75 is formed in the central bumper 72 so that the stopper protrusion 76 is fitted into the protrusion hole 75.

The bumper bumper hole 77 is engaged with the stopper protrusion 76 formed on the upper end surface 33 of the back post and the bumper hole 77 of the bumper hole 77 is engaged with the bumper hole 77 of the backlit link. The back plate 60 rotates in the left and right direction as shown in FIG. 11 when the back plate 60 is rotated in the left-right direction about the rotation axis 41 of the rotation part, The shape of the side bumper 74 is deformed and the turning of the back plate 60 in the right and left direction is facilitated and the side bumper 74 is moved to the center bumper 72, the left / right turn of the backing plate 60 is stopped by the supporting force of the stopper protrusion 76 coupled to the center bumper 72.

When the force for deforming the back plate 60 is lost, the side bumpers 74 of the elastic stopper 70 are restored to their original shapes by the self-elastic force, The back plate 60 is returned to the original position by restoring the shape.

The back plate 60 may be configured such that both lower ends thereof are bolted to a lower post of a back post or may be fitted together by a known one-touch method. In order to prevent torsional damping and friction noise between the back plate and the back post, An elastic bush (not shown) may be inserted to be inserted.

In addition, the back plate 60 and the lower post 32 are preferably configured to be one-touch fit by a ball screw type twist portion 50.

The twist portion 50 connects the back plate portion and the back post portion with a ball screw type so that both sides of the bottom plate portion of the back plate can be easily rotated leftward and rightwardly and twisted. As shown in FIGS. 2 and 12, A ball stud 51 provided with a ball 52 in the ball stud 52 and a twisted rubber 53 placed between the ball 52 and the back post 30 of the ball stud, And a support socket 55 formed on both sides of the lower end of the backing plate so as to be accommodated.

The ball stud 51 is fixed to the fastening hole 35 of the back post by a fastening means 54 such as a screw and has a shaft for left and right twist.

The twist rubber 53 is provided so that one side is in close contact with the back post 30 and the other side is in close contact with the supporting socket 55 so that the back plate 60 is positioned on the left and right sides of the ball stud 51 When twisted, the back plate 60 is elastically supported, and noise caused by friction is prevented.

Since the twist rubber 53 is closely attached to the back plate 30 and the back plate 30, the twist rubber 53 has a function of preventing a gap between the back plate 60 and the back post 30 from being generated.

Such a twisted rubber 53 is fitted to the ball stud 51 and then fastened together when the ball stud 51 is fastened to the back post by a screw.

The support socket 55 has an accommodation space 56 in which the ball 52 of the ball stud is received and is elastically brought into close contact with the outside of the ball 52 while the ball 52 of the ball stud is rotatably inserted A part of which can be formed as an incised shape. That is, the support socket 55 is formed continuously with a plurality of support pieces 57 through the cutout groove 58 so that the support socket 55 has the accommodation space 56 therein. The ball 52 of the ball stud is formed so as to have an opening portion 59 opened to a size smaller than the diameter of the ball so that the axial height thereof is smaller than the diameter and larger than the radius of the ball by the support piece 57 of the ball stud, The inlet portion 59 of the support socket is elastically expanded and the outer surface of the ball 52 inserted into the inside accommodation space 56 is in close contact with the plurality of support pieces 57 As shown in FIG.

According to the present invention configured as described above, the body 41a of the rotation shaft passing through the separation chamber 43 is inserted into the shaft hole (not shown) of the back post in a state where the separation chamber 43 is fitted to the rotation shaft 41 of the rotation part 40 The back plate 30 is coupled to the rotation unit 40 so that the rotation unit 40 is inserted into the multi-stage coupling hole 64 of the back twist link after the rotation unit 40 is inserted into the back post 30 to be inserted into the multi- .

When the rotation part 40 is inserted into the multi-stage coupling hole 64 of the back twist link 62, the locking projection 47 of the separation projection of the rotation part is inserted into the engagement hole 67 of the multi-stage coupling hole, The rotation axis and the deviation preventing hole are positioned in the main engagement hole 66 of the multi-stage engagement hole. At this time, the latching protrusion 47 of the releasing restraining portion is formed such that the lower end surface 49 of the latching protrusion 47 is formed at a right angle with respect to the outer surface 46, and the latching protrusion 47 is formed between the main engaging hole 66 and the engaging hole 67 of the multi- The rotation of the rotary part 40 in the multi-stage coupling hole 64 is prevented by the contact of the stepped step 67a located at the lower end of the locking projection and the lower projection surface 49 of the locking projection.

The latching protrusion 47 of the releasing rest region has the projection upper end surface 48 as an inclined surface and has a cutout groove 45 at one side so that insertion into the multi-step engagement hole 64 is facilitated .

Thus, when the back plate 60 is connected to the upper post 31 of the back post by the rotation part 40, the lower ends of the back plate are connected to the lower posts 32 of the back post.

The ball 52 of the ball stud 51 fixed to the back post 30 may be mounted on the back plate 30 when the back plate portion 60 and the lower post portion 32 are coupled by the twist portion 50. In this case, / Into the formed support sockets 55 to connect the ball studs 51 of the twisted portions 50 and the support sockets 55 one-touch.

11 and 14, when the back plate 30 is assembled to the back post 30 by the rotation unit 40 and the twist unit 50, when the user applies a force to the back plate 60, The back plate portion 60 is rotated in the left and right direction about the rotary portion 40 so that the upper plate portion 65 can be deformed.

13, when the both upper end portions 65 of the backrest portion are rotationally deformed in the left-right direction, the lower end portion of the backrest portion 60 is also tilted by the twist portions 50 formed by the ball joint- Thereby causing a predetermined rotation and twisting in the direction.

In the operation of the present invention as described above, for example, in a state where the user is seated on the seat portion of the chair, the backward movement or the stretching that rotates the upper body in the lateral direction can be easily performed.

That is, when the user moves backward, the user's neck, shoulders, and upper portion of the back are twisted to increase the range of movement, but the lower portion of the user's waist and lower back is relatively small in range of movement.

Therefore, according to the present invention, the upper end of the back plate is rotatable about the rotation part, and the lower end of the back plate can be rotated and twisted by the twist part. Thus, The user can easily and stably support the user.

15 is a view showing an example of a tilting operation of the back plate according to the present invention. The back post 30, in which the back plate 60 is assembled as described above, is connected to the support portion 10 of the chair , Rotation, tilting, and the like can be smoothly performed.

It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined in the appended claims and their equivalents. Of course, such modifications are within the scope of the claims.

(10): Support portion (11): Rotation means
(12): armrests (13): rotating wheels
(14): moving means (15): tilting means
(20): sheet portion (30): back post
(31): upper post (32): lower post
(33): upper surface (34): shaft hole
(35): fastening hole (36): connecting post
(40): rotating part (41): rotating shaft
(41a): body (41b): head
(43): Releasing chamber (43a): Upper side
(43b): inner surface (44): through hole
(45): incision groove (46): outer surface
(47): a locking projection (48): a projection top surface
(49): Lower surface of projection (50): Twisted part
(51): ball stud (52): ball
(53): twisted rubber (54): fixing means
(55): support socket (56): accommodation space
(57): support piece (58): incision groove
(59): inlet portion (60): back plate portion
(61): back plate (62): backlit link
(63): lower surface (64): multi-stage coupling hole
(65): upper both side portions (66): main engaging hole
(67): engaging hole (67a): stepped jaw
(68): communication hole (69): slit hole
(70): elastic stopper (71): bumper
(72): central bumper (73): interspace
(74): side bumper (75): projection hole
(76): stopper projection (77): bumper hole
(100): Chair

Claims (10)

A seat portion 20 connected to the support portion 10,
A back post 30 to which a lower end is fixedly attached to the support portion 10,
And a back plate 60 connected to the upper end of the back post 30 by the rotation part 40 and coupled to the back post 30 at the lower end of the back post 30,
The rotation part 40 includes a bumper 71 made of an elastic body and a stopper projection 76 protruding from the upper end surface 33 of the back post so that the bumper 71 is fitted into the bumper 71, And an elastic stopper portion (70) including a bumper hole (77) formed in a lower end surface (63) of the backrotate link (62) for insertion,
And the backboard part (60) is rotated and deformed in the left and right direction around the rotation part (40) according to the user's body movement.
The method of claim 1,
The rotary section 40 includes a rotary shaft 41 inserted into the shaft hole 34 of the back post and the multi-stage coupling hole 64 of the backrotate link, and a rotary shaft 41 installed to surround the rotary shaft 41, And a release retainer (43) inserted into the hole (64).
The method of claim 2,
The leaving zone (43) A cutout groove 45 is formed in the longitudinal direction so as to communicate with the through hole 44 on one side and a cutout groove 45 is formed in the longitudinal direction along the circumference of the outer face 46 A locking protrusion 47 is formed so as to be protruded,
The multi-stage coupling hole 64 has a main coupling hole 66 into which a rotation shaft and a releasing earth are inserted and an inner diameter larger than an inner diameter of the main coupling hole 66 and is formed in the main coupling hole 66, And a locking engagement hole (67) into which a locking projection of the earth is inserted.
The method of claim 3,
The locking projection 47 is configured such that the projection upper end face 48 has a predetermined inclined face with respect to the outer face 46 and the projection lower end face 49 has a rectangular face with respect to the outer face 46 And a flexible back plate portion.
The method of claim 2,
The backlit link 62 is further formed with a communication hole 68 for communicating with the multi-stage coupling hole 64 for improving the disassembly / assembling property of the rotation portion 40 on one side facing the back plate 61 Wherein the chair is provided with a flexible back plate.
delete The method of claim 1,
The bumper 71 is integrally formed on both sides of the central bumper 72 so as to have an interspace 73 between the central bumper 72 to which the stopper projection 76 is fitted and the central bumper 72 And a side bumper (74).
The method of claim 1,
The back plate 60 is connected at one end to the back post 30 by the twist portion 50,
The twist portion 50 includes a ball stud 51 having a ball 52 at its tip end, a twisted rubber 53 disposed between the ball 52 of the ball stud and the back post 30, And a support socket (55) formed on both sides of the lower end of the back plate so that the balls (52) of the ball stud are inserted and accommodated.
The method of claim 1,
The back post 30 includes an upper post 31 connected to the back plate 60 by the rotary part 40 and a lower post 31 integrally formed on the upper post 31 and connected to both sides of the lower end of the back plate 60 And a lower post (32)
The back plate 60 includes a back plate 61 for supporting the back portion of the user and an upper post 31 of the back post 30 connected to the center of the upper rear surface of the back plate 61, And a backlit link (62) coupled to the backrest link (62).
delete

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