KR101759479B1 - Back of chair - Google Patents

Abstract

And a regulating part for regulating the height and the degree of protrusion of the seat part so as to correspond to the shape of the waist of the user, wherein the regulating part comprises: a frame formed in a rectangular frame shape; An adjusting plate formed in a rectangular plate shape, a lifting member and a casing moving up and down along the vertical direction while being coupled to each other at the front and rear of the adjusting plate, a connecting member connecting the elevating member and the engaging portion provided at the seat, And an elastic member provided inside the casing and having a fixing protrusion formed on a front surface thereof for locking or unlocking the lowering operation of the lifting member and the casing, and an elastic member for providing a restoring force to the fixing plate, By moving the lower end of the elastic frame in the vertical direction, The height of the lumbar support portion in which the waist region is supported can be adjusted and the degree of projection to the front side can be adjusted.

Description

{BACK OF CHAIR}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a backrest for a chair, and more particularly, to a backrest for a chair that supports the waist and back of a user by adjusting the degree of protrusion of the backrest according to the shape of the waist of the user.

Generally, the chair includes a seat, a leg, and a backrest.

The backrest is supported from back to back, shoulder and neck, and it is made variously by applying ergonomics.

The backrest is usually manufactured by attaching a sheet material to the inside of a frame and covering the outer surface with a sheet of cloth or leather.

In recent years, the backrest is equipped with a lumbar support to relieve tension on the back and relieve the burden on the spine.

The applicant of the present invention has filed and registered a technique relating to a backrest for a chair in many of the following Patent Documents 1 to 3 and the like.

The user who uses the chair has a function of adjusting the height of the lumbar support and the forward and backward positions protruding toward the waist of the user in order to provide a comfortable seating feeling to the user as the shape of the sitting key and the waist area are different from each other Is applied.

For example, the present applicant has filed and registered a technique for adjusting the degree of protrusion of a lumbar support applied to a chair in many of the following Patent Documents 1 and 2.

Patent Document 1 discloses a backrest frame for supporting a back and back portion of a user, a bracket coupled to a seat portion, and a lumbar support fixed by the bracket and supporting a waist portion of the user, A moving means coupled to a rear side of the bracket for moving in a vertical direction along a moving space formed in the bracket to adjust a height of the pedestal and a through hole formed in the moving means to be coupled with the pedestal, And an adjusting means for adjusting the backrest of the chair.

Patent Document 2 includes a frame formed as a rectangular frame, a seat portion coupled to the front surface of the frame, and an adjustment portion for adjusting the degree of protrusion of the seat portion corresponding to the shape of the waist of the user, wherein the adjustment portion is rotatably A gear member for switching the rotation operation of the lever in the orthogonal direction, an elevating member for moving up and down by the rotational movement of the gear member, and a rotating member for rotating and moving the elevating member by rotational movement of the gear member The structure of a backrest for a chair is described.

Korea Patent Registration No. 10-1174458 (issued on August 23, 2012) Korea Patent Registration No. 10-1468703 (issued on December 5, 2014)

However, in Patent Document 1, as the lumbar support is provided and the degree of protrusion of the lumbar support is adjusted, the number of parts constituting the back is increased, complicating the structure, increasing the working time, and increasing manufacturing cost.

In order to solve such a problem, in Patent Document 2, the lumbar support is removed and the lifting member is elevated and lowered using a gear member to adjust the degree of protrusion of the seat portion.

However, in Patent Document 2, since the lever connected to one side of the gear member has to be rotated by a force, there has been a problem in that it is inconvenient to operate the lever when adjusting the degree of protrusion of the seat portion.

SUMMARY OF THE INVENTION An object of the present invention is to provide a chair back which changes the shape of a backing frame to elastically support a waist portion of a user.

Another object of the present invention is to provide a chair back capable of adjusting the height and the degree of projection of the lumbar support of the seat portion according to the user's body shape.

In order to achieve the above object, a chair back according to the present invention includes a frame formed in a rectangular frame, a seat portion coupled to a front surface of the frame, and a height and protrusion degree of the seat portion corresponding to a shape of a waist of a user The control unit includes a control plate formed in a rectangular plate shape, an elevating member and a casing that are vertically moved in a state where the control plate is engaged with the front and rear sides of the control plate, A fixing plate provided inside the casing and having a fixing protrusion for locking or releasing a descending operation of the elevating member and the casing on the front surface, and an elastic member for providing a restoring force to the fixing plate, And a control unit.

As described above, according to the chair seat backrest according to the present invention, the lower end of the elastic frame provided on the backrest is vertically moved to adjust the height of the lumbar support portion where the user's waist is supported, Can be controlled.

Therefore, according to the present invention, it is possible to provide comfort and comfort to the user by adjusting the height and the degree of projection of the lumbar support according to the shape, posture, and work environment of the user's waist.

According to the present invention, it is possible to simplify the configuration of the backrest, thereby improving the workability in manufacturing the backrest and reducing the manufacturing cost.

1 is a perspective view of a chair to which a chair back is applied according to a preferred embodiment of the present invention,
Fig. 2 is an exploded perspective view of the backrest shown in Fig. 1,
Fig. 3 is an exploded perspective view of the backrest shown in Fig. 2,
4 is an exploded perspective view of the adjustment portion shown in Fig. 2,
Fig. 5 is an exploded perspective view showing the adjustment portion shown in Fig. 4 from another angle,
Figure 6 is a cross-sectional view of the adjustment portion shown in Figure 2;
Figs. 7 and 8 are operational states showing the operation of regulating the degree of projection of the lumbar support. Fig.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, a chair back according to a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

In this specification, the direction in which the backrest is installed around the seat portion is referred to as the rear of the chair, and the opposite direction is referred to as the front of the chair.

Accordingly, the surface of the back of the user who is in contact with the back and back of the user is referred to as the front surface of the back, and the opposite surface is referred to as the back surface of the back.

In this specification, a portion of the seat that supports the lumbar part of the user is referred to as a lumbar support (V).

1 is a perspective view of a chair to which a chair back is applied in accordance with a preferred embodiment of the present invention.

As shown in FIG. 1, a chair 10 to which a chair back according to a preferred embodiment of the present invention is applied is connected to a leg 11 having a plurality of wheels, a leg 11, A seat portion 12 for seating the seat portion 12, and a back portion 13 connected to the rear side of the seat portion 12. [

Here, armrests may be mounted on both sides of the seat portion 12 or the backrest 13 to support a user's arm.

And a headrest 14 may be installed at an upper end of the backrest 13. [

Fig. 2 is an exploded perspective view of the backrest shown in Fig. 1, and Fig. 3 is an exploded perspective view showing the backrest shown in Fig. 2 at different angles.

2 and 3, a chair back 13 according to a preferred embodiment of the present invention includes a frame 20 formed in a substantially rectangular frame shape, a seat portion 30 And an adjusting unit 40 for adjusting the height and the degree of protrusion of the seat 30 so as to correspond to the shape of the waist of the user.

The frame 20 may be formed so that the central portions of both side ends are bent toward the front so as to correspond to the back and waist portions of the user.

The lower end of the frame 20 can be engaged with the rear end of the seat portion 12. [

At the lower end of the frame 20, a case 21 in which the adjusting part 40 is installed may be provided.

The case 21 includes a coupling protrusion 22 protruding upwardly from the lower end of the frame 20 and a coupling protrusion 22 formed in a substantially hexahedron shape having a front opening so that a space in which the regulating part 40 is installed, And a front cover 23 coupled to a front surface of the front cover 23.

The front cover 23 may be provided with a lifting and lowering space 24 for lifting and lowering the lifting and lowering member 42.

The seat portion 30 may include an elastic frame 31 formed in a shape corresponding to the shape of the frame 20 and a seat 32 provided in the front or inside space of the elastic frame 31.

The elastic frame 31 is formed in a substantially rectangular shape and has a thin thin plate made of a material having elasticity such as a synthetic resin so as to easily adjust the degree of protrusion toward the front in accordance with the formation of the waist of the user . ≪ / RTI >

A coupling portion 33 is formed at the lower end of the rear surface of the elastic frame 31 so as to be coupled with the coupling member 43 of the adjusting portion 40 to be described below so as to adjust the degree of protrusion of the seat portion 30. [ .

The engaging portion 33 is provided at the lower end of the elastic frame 31 and includes an installation portion 35 in which an installation space for installing a rotation shaft 431 of the regulating portion 40 to be described below is formed, And may include a coupling member 34 on the front surface of the mounting portion 35.

The engaging member 34 is formed in the shape of a rectangular plate and can be fixed to the mounting portion 35 by a fastening bolt that passes through the rear surface of the mounting portion 35.

The mounting portion 35 is formed in a substantially hexahedron or a cylindrical shape having a front surface and the mounting portion 35 can be molded integrally with the elastic frame 31. [

A mounting hole 36 may be formed in the central portion of the mounting portion 35 so that a connecting member 43 having a rotating shaft 431 at its tip is drawn out to the rear.

The seat 32 is made of a mesh-like cloth material so that the air on the front and rear sides of the backrest 13 can move smoothly. In order to comfortably support the user's waist and back, (Not shown).

The seat portion 30 is axially coupled to a pair of first support portions 25 provided at both ends of the front face of the frame 20 so that the upper end portion of the seat portion 30 can be rotated when the lumbar support portion V is raised, And may further include a second support portion 37.

However, the present invention is not limited thereto. Instead of the seat portion 30, a back plate made of a thin plate having elasticity may be used. It may be changed.

Next, the configuration of the adjusting unit will be described in detail with reference to Figs. 4 to 7. Fig.

Fig. 4 is an exploded perspective view of the regulating portion shown in Fig. 2, Fig. 5 is an exploded perspective view showing the regulating portion shown in Fig. 4 from another angle, Fig. 6 is a cross- Fig. 5 is an operational state view of the fixed plate and the casing shown in Fig.

As shown in FIGS. 4 to 7, the adjusting unit 40 includes an adjusting plate 41 formed in a substantially rectangular plate shape, a pair of upper and lower plates 41, A connecting member 43 that connects the elevating member 42 and the casing 44 that operate and the engaging portion 33 of the elevating member 42 and the elastic frame 31; A fixing plate 45 on which a fixing protrusion 451 for locking or unlocking the lowering action of the member 42 and the casing 44 is formed and an elastic member 46 for providing a restoring force on the fixing plate 45 have.

A pair of moving spaces 411 may be formed on both sides of the adjusting plate 41 to move up and down in a state where the elevating member 42 and both ends of the casing 44 are coupled to each other.

A fixing protrusion 451 formed on the front surface of the fixing plate 45 is provided at the center of the adjusting plate 41 with a moving hole 412 for moving the elevating member 42 and the casing 44 in a stepwise manner A plurality of fixing grooves 413 inclined to one side can be formed in communication with the moving holes 412 at predetermined intervals.

Here, the moving hole 412 may extend upward from the fixing groove 413 formed at the uppermost one of the plurality of fixing grooves 413 along the vertical direction.

The elevating member 42 is formed in a substantially hexahedral shape so as to have an engaging space 421 in which the connecting member 43 is engaged therein. The latching groove 422 can be formed.

The connecting member 43 is formed in a substantially rectangular plate shape and a rotating shaft 431 coupled to the engaging portion 33 of the elastic frame 30 may be provided at the tip of the connecting member 43.

A pair of elastic bars 432 may be formed on the rear end of the connecting member 43 so as to be coupled to the engaging space 421 inside the elevating member 42 by elasticity.

The pair of elastic bars 432 of the connecting member 43 are inserted into the engaging space 421 through the front opening of the elevating member 42 in the elastically deformed state so that the distance therebetween becomes closer to each other, The upper end of the lifting member 42 is engaged with the engaging groove 422 formed on both sides of the rear end of the lifting member 42. [

For this purpose, a pair of elastic bars 432 may be formed at the rear ends thereof with hooks protruding outwardly.

The casing 44 may be formed in a substantially hexahedral shape in which a rotation space 441 in which the fixing plate 45 rotates is formed.

An installation groove 442 in which an elastic member 46 for providing a restoring force to the fixing plate 45 is installed may be formed at one side of the rotation space 441 to communicate with the rotation space 441.

At both ends of the casing 44 are formed engaging grooves 443 for engaging the engaging protrusions 423 formed at the rear ends of the both ends of the elevating member 42. The engaging grooves 443 are formed at the center of the engaging grooves 443, A through hole may be formed through which the fixing bolt fastened to the coupling protrusion 423 passes.

The fixing plate 45 is formed in a rectangular plate shape having a semicircular shape on the upper and lower surfaces, respectively, and can be rotatably installed in the rotating space 441 of the casing 44.

A fixing protrusion 451 selectively engaged with the moving hole 412 of the adjusting plate 41 and the plurality of fixing grooves 413 is formed on the front surface of the fixing plate 45 by the rotation of the fixing plate 45 And a support block 452 for supporting one end of the elastic member 46 may be formed on the rear surface of the fixing plate 45.

The fixing protrusions 451 may protrude obliquely toward the lower left and right upper ends so as to correspond to the plurality of fixing grooves 413 as shown in FIG.

5, a left side surface of the support block 452 is formed as a vertical surface, and an insertion groove 453 through which the left end of the elastic member 46 is inserted may be formed on the right side surface of the support block 452 have.

Here, the inner side surface of the insertion groove 453 may be inclined so that the elastic member 46 can be elastically deformed or restored according to the position of the fixing protrusion 451.

The upper end of the support block 452 may be formed into a convex curved surface such that the support block 452 can rotate smoothly in the rotation space 441.

One side surface of the support block 452 is formed as a vertical surface 454 and the inner surface of the insertion groove 453 formed in the other side surface of the support block 452 is fixed to the fixing protrusion 451 and the fixing groove 413, 7 (a) and 7 (c), the fixing plate 45 is normally inclined to correspond to the shape of the elastic member 46, And is arranged to be inclined.

The fixing protrusion 451 of the fixing plate 45 is inserted into any one of the plurality of fixing grooves 413 formed in the adjusting plate 41 to lock down the downward movement of the fixing plate 45. [

Next, the coupling relationship of the chair back according to the preferred embodiment of the present invention will be described in detail.

First, the operator places the elevating member 42 and the casing 44 on the front and rear sides of the adjusting plate 41 and fixes the fixing bolts to both ends of the elevating member 42 and the casing 44, respectively.

At this time, an elastic member 46 and a fixing plate 45 are installed in the installation groove 442 and the rotation space 441 of the casing 44, respectively.

When the adjustment part 40 is assembled through the above process, the adjustment part 40 is installed inside the engagement protrusion 22 of the case 21 provided at the lower end of the frame 20, The front cover 23 is attached to the front of the front cover 23.

At this time, the front end portion of the elevating member 42 protrudes forward through the elevating and lowering space 24 of the front cover 23. [

The operator places the seat portion 30 in front of the frame 20 and the first support portion 25 provided on the both side end surfaces of the frame 20 and the second support portion 37 provided on the rear surface of the seat portion 30, And a coupling shaft (not shown) is provided.

The operator joins the connecting member 43 of the adjusting portion 30 to the front of the mounting portion 35 provided at the lower end of the elastic frame 31 and connects the connecting member 43 to the rear end of the connecting member 43 through the mounting hole 36 The pair of elastic bars 432 are drawn out to the rear, and then the engaging member 34 is engaged with the front surface of the attaching portion 35.

Finally, the operator inserts the pair of elastic bars 432 into the engaging space 421 through the front opening of the elevating member 42 provided on the frame 20 while elastically deforming the pair of elastic bars 432 so as to come close to each other, do.

At this time, the pair of elastic bars 432 are restored to their original shapes, and the engaging protrusions formed on the outer surface of the rear end of the pair of elastic bars 432 are engaged with the engaging grooves 422 formed on both side walls of the rear end of the elevating member 42, The connecting member 43 and the elevating member 42 can be stably coupled to each other.

4 to 9, a method of operating a chair back according to a preferred embodiment of the present invention will be described in detail.

FIGS. 8 and 9 are operation state diagrams showing operations for adjusting the degree of protrusion of the lumbar support.

Fig. 8 shows a state in which the lumbar support is projected forward, and Fig. 9 shows a state in which the lumbar support is flatly adjusted.

The fixing protrusion 451 formed on the front surface of the fixing plate 45 of the regulating part 40 can be moved in the upward direction by moving the lower end of the elastic frame 31 upward to adjust the degree of protrusion so that the user projects the lumbar support V As shown in FIG. 7 (b), moves upward along the inclined surface of the inclined fixing groove 413 and rotates counterclockwise to be vertical.

As a result, the fixing plate 45 is lifted while being rotated along the counterclockwise direction.

When the fixing protrusion 451 moves upward and reaches the next fixing groove 413 formed on the upper portion of the initially coupled fixing groove 413 as shown in Fig. 7C, the restoring force of the elastic member 46 That is, in a tilted state, and is coupled to the next fixing groove 413. [0050]

As described above, according to the present invention, the lower end of the elastic frame of the seat portion can be pushed upward, and the degree of projection can be adjusted so that the lumbar support portion protrudes forward.

According to the present invention, the fixing plate provided on the adjusting part is moved upward while being sequentially coupled to a plurality of fixing grooves formed on the adjusting plate, so that the degree of protrusion of the lumbar support can be adjusted stepwise.

On the other hand, the user may raise the fixing plate 45 to the upper end of the adjusting plate 41, and then move the fixing plate 45 to a desired position to adjust the degree of projection, or move it to the lowermost position as shown in FIGS. So that the degree of protrusion can be adjusted so that the lumbar support V becomes flat.

7 (d), the moving hole 412 of the adjusting plate 41 is extended upward from the uppermost fixing groove 413, so that the fixing protrusion 451 is moved And moves up to the upper end of the hole 412 to be vertically disposed.

Therefore, the fixing plate 45 can be moved to the lower end of the adjusting plate 41 at one time, regardless of the restoring force of the elastic member 46.

As described above, the present invention can adjust the degree of protrusion of the elastic frame so as to correspond to the shape of the waist portion of the user.

Although the invention made by the present inventors has been described concretely with the above embodiments, the present invention is not limited to the above embodiments, and it goes without saying that various changes can be made without departing from the gist of the present invention.

In the above embodiment, the seat portion is provided on the backrest. However, the present invention is not limited to this, and the seat back portion may be modified to use a back plate made of a resilient thin plate.

The present invention is applied to a chair backrest technique for adjusting the degree of protrusion of an elastic frame so as to correspond to a shape of a waist portion of a user.

10: Chair 11: Leg
12: seat portion 13: backrest
14: headrest 20: frame
21: Case 22:
23: front cover 24:
30: seat portion 31: elastic frame
32: sheet 33:
34: engaging member 35:
36: installation hole 40: regulating portion
41: adjusting plate 411: moving space
412: moving hole 413: fixing groove
42: lifting member 421: engaging space
422: Retaining groove 423:
43: connecting member 431:
432: elastic bar 44: casing
441: Rotation space 442: Installation groove
443: engaging groove 45: stationary plate
451: Fixing projection 452: Supporting block
453: insertion groove 454: vertical surface
46: elastic member
V: lumbar support

Claims (8)

A frame formed in a rectangular frame shape,
A sheet portion coupled to a front surface of the frame,
And an adjuster for adjusting the height and the degree of protrusion of the seat so as to correspond to the shape of the waist of the user,
The regulating unit includes an adjusting plate formed in a rectangular plate shape,
A lifting member that moves up and down along the vertical direction in a state of being coupled to each other at the front and rear sides of the adjustment plate,
A connecting member for connecting the elevating member and the engaging portion provided on the seat portion,
A fixing plate provided in the casing and having a fixing protrusion for locking or releasing the lowering operation of the lifting member and the casing,
And an elastic member for providing restoring force to the fixing plate. The method according to claim 1,
A pair of moving spaces are formed on both sides of the adjusting plate, the pair of moving spaces moving in the vertical direction in a state where the elevating member and both ends of the casing are coupled to each other,
A fixing protrusion formed on a front surface of the fixing plate is provided with a moving hole for moving the fixing plate in a vertical direction,
A plurality of fixing grooves formed so as to be inclined to one side are formed in communication with the moving holes at predetermined intervals so that the elevating member and the casing ascend stepwise in the ascending operation of the elevating member and the casing,
Wherein the moving hole is formed to extend upward from a fixing groove formed at the uppermost one of the plurality of fixing grooves along the vertical direction. 3. The method of claim 2,
Wherein the elevating member is formed in a hexahedron so as to provide a coupling space in which the connecting member is coupled,
Wherein both side walls of the rear end portion of the elevating member are formed with latching grooves to which both rear ends of the connecting member are hooked,
A rotation shaft coupled to the coupling portion is provided at a tip of the coupling member,
A pair of elastic bars extending from the rear end of the connecting member to be coupled to the engagement space inside the elevating member by elasticity,
Wherein a pair of elastic bar rear ends are formed with hooking protrusions which are respectively directed outwardly so as to be caught in the engaging grooves. 3. The method of claim 2,
Wherein the casing is formed in a hexahedron shape in which a rotation space in which the stationary plate rotates is formed therein,
Wherein an installation groove, in which the elastic member is installed, communicates with the rotation space at one side of the rotation space,
Wherein the fixed plate is formed in a rectangular plate shape having an upper surface and a lower surface in a semicircular shape and is rotatably installed in a rotating space of the casing,
A fixing protrusion is formed on a front surface of the fixing plate to selectively engage with a moving hole of the adjusting plate and a plurality of fixing grooves by rotation of the fixing plate,
Wherein the fixing protrusions are inclined to correspond to the plurality of fixing grooves. The method of claim 4, wherein
A support block for supporting one end of the elastic member is formed on a rear surface of the fixing plate,
One side surface of the support block is formed as a vertical surface,
An insertion groove into which one end of the elastic member is inserted is formed on the other side surface of the support block,
Wherein an inner side surface of the insertion groove is formed to be inclined to press or elastically deform or restore the elastic member according to a position of the fixing protrusion. 6. The method according to any one of claims 1 to 5,
Wherein the seat portion includes an elastic frame formed in a shape corresponding to the shape of the frame,
And a sheet installed in the front or inside space of the elastic frame,
And a second support portion which is axially coupled to the first support portions provided on both sides of the front face of the frame is provided on the rear side of the upper end of the seat portion. The method according to claim 6,
And a coupling portion to which the coupling member of the regulating portion is coupled is provided at the lower end of the rear surface of the elastic frame,
Wherein the coupling portion includes an installation portion in which an installation space in which the rotation axis of the control portion is installed is formed,
And an engaging member coupled to a front surface of the mounting portion,
Wherein the mounting portion is formed with a mounting hole for the connecting member to be drawn out rearward. The method according to claim 6,
Wherein the seat portion can be changed to a back plate portion manufactured using a thin plate having elasticity.

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