KR101541160B1 - Back of chair - Google Patents

Abstract

The present invention relates to back of a chair, comprising: a frame formed in a square frame shape; a seat portion installed in a front side of the frame or an internal space; a lumbar support formed in a shape corresponding to a waist portion shape of a user to support a waist portion; and a fixed module fixated on the frame so as to control a height of the lumbar support and a protruding degree. The lumbar support moves in a vertical direction to control the height, and simultaneously a forward protruding degree can be controlled.

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 having a lumbar support for supporting a waist portion of a 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.

Such a 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 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, Patent Literature 1 and Patent Literature 2 described below have been filed and registered with a technology for controlling the degree of protrusion of a lumbar support applied to a chair.

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, when the function of adjusting the degree of projection of the lumbar support is applied as in Patent Documents 1 and 2, as the number of parts constituting the back is increased, the structure becomes complicated and the working time is increased, .

SUMMARY OF THE INVENTION An object of the present invention is to provide a backrest for a chair to which a lumbar support for elastically supporting a waist portion of a user is applied.

Another object of the present invention is to provide a chair back capable of adjusting the height and the degree of protrusion of the lumbar support.

In order to achieve the above-mentioned object, a chair back according to the present invention includes a frame formed in a rectangular shape, a seat part provided on a front surface of a frame or an internal space, and a shape corresponding to a shape of a waist of a user, A lumbar support for supporting the lumbar support, and a fixing module for fixing the lumbar support to the frame so as to adjust the height and the degree of protrusion of the lumbar support, wherein the lumbar support restrains a degree of protrusion .

The lower frame forming the lower end of the frame is provided with a boss portion that is coupled to the lumbar support so as to be movable in the up and down direction and the rear surface and the boss portion are inclined so as to protrude toward the waist portion toward the upper end .

Wherein the lumbar support includes a pedestal for supporting a waist of a user and a connection part extending downward at a lower end of the pedestal and being movably coupled along a vertical direction to a boss formed in a lower frame of the frame, And a fixing bolt for fixing the fixing module to the boss unit is formed at the center of the fixing module.

Two pairs of movement guides extending in the vertical direction are formed on the front surface of the boss unit to guide the movement of the connection unit in the vertical direction and coupling guides are formed on the rear surface of the connection unit, .

The pedestal is protruded from the upper and lower ends so as to correspond to the shape of the user's waist when viewed from the side. Both ends of the pedestal protrude forward to cover the waist of the user when viewed from above, And at least one elastic slit is formed on the upper end of the pedestal.

As described above, according to the chair back according to the present invention, the height of the lumbar support can be adjusted by moving the lumbar support in the vertical direction, and the degree of projection to the front can be adjusted.

Accordingly, 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 in accordance with the shape, posture, and work environment of the user's waist.

According to the present invention, an elastic slit is formed in the lumbar support so that the lumbar support can be elastically deformed according to the force applied by the user, so that the waist portion can be comfortably supported.

In addition, the present invention provides a simple configuration for adjusting the height and the degree of projection of the lumbar support and the lumbar support, thereby improving the workability in manufacturing the back and reducing the manufacturing cost.

1 is a side view of a chair to which a chair back is applied according to a preferred embodiment of the present invention;
2 is a perspective view of a chair back according to a preferred embodiment of the present invention,
Fig. 3 is a partially enlarged view of the seat back of the chair shown in Fig. 2,
4 is a perspective view of the lumbar support,
5 and 6 are operational state diagrams of a backrest for a chair according to a preferred embodiment of the present invention.

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.

1 is a side view of a chair to which a chair back is applied according to a preferred embodiment of the present invention.

As shown in FIG. 1, a chair to which a chair back according to a preferred embodiment of the present invention is applied includes a leg 11 having a plurality of wheels, a leg 11 connected to the chair 11, And a backrest 13 connected to the rear side of the seat portion 12. The seat portion 12 includes a seat back 12,

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

A headrest (not shown) may be installed at the upper end of the backrest 13.

Of course, the present invention is not limited to this, and it should be noted that the legs 11, the seat 12, the armrests and the headrest can be modified to be applied to various types of chairs.

FIG. 2 is a perspective view of a backrest for a chair according to a preferred embodiment of the present invention, and FIG. 3 is a partially enlarged view of a backrest for a chair shown in FIG.

1 and 2, 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 20 provided on the front or inside of the frame 20, A lumbar support 40 which is formed in a shape corresponding to the shape of the waist of the user and supports the waist portion and a lumbar support 40 which fixes the lumbar support 40 to the frame 20 Module 50 as shown in FIG.

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 coupled to the seat 12 or the rear end of the assembly 14.

Here, the lower frame 21 forming the lower end of the frame 20 may be provided with a boss portion 22 to which the lumbar support 40 is movably coupled in the vertical direction.

The boss portion 22 may be formed to extend upward in a central portion of the lower frame 22.

The boss unit 22 may be formed in a hexahedron shape having an open front so as to provide a mounting space in which a connecting portion 42 of the lumbar support 40 to be described below is installed.

Two pairs of movement guides 23, which guide the movement of the connecting portion 42 in the up-and-down direction, can be projected forward and extend in the vertical direction on the rear side of the installation space of the boss 22.

Between each pair of the movement guides 23, a fastening part 24 to fasten the fixing bolt to fix the fixing module 50 to the boss part 22 may be formed.

A fastening groove for fastening the fixing bolt may be formed on the front surface of the fastening part 24.

The boss unit 22 may be inclined forward toward the upper end in order to adjust the degree to which the lumbar support 40 protrudes forward when the lumbar support 40 is vertically moved.

The seat portion 30 may include a seat frame 31 coupled to the frame 20 and a seat 32 mounted on the frame 20 by the seat frame 31. [

The seat frame 31 is formed in a substantially rectangular frame shape corresponding to the front surface of the frame 20 and can be coupled to the frame 20 using a hook or the like so as to be detachable from the frame 20.

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 waist and the back of the user, (Not shown).

Of course, the present invention is not limited to this, but may be modified to apply various types of sheets such as a plate made of a synthetic resin material such as plastic and a plate type including a cushion installed on the front surface of the plate.

4 is a perspective view of the lumbar support.

3 and 4, the lumbar pedestal 40 includes a pedestal 41 for supporting a waist portion of the user, a lower frame 41 extending downward from the lower end of the pedestal 41, And a connecting portion 42 movably coupled to the boss portion 22 formed in the upper and lower portions 21 and 21 in the vertical direction.

The pedestal 41 may be formed in various shapes such as a substantially disk shape, a disk shape, or a rectangular plate shape corresponding to the waist shape of the user.

The pedestal 41 may be formed as a curved surface that is bent toward the front when viewed from the side, with the center portion protruding from the upper and lower ends to correspond to the waist shape of the user.

When viewed from above, the pedestal 41 may be formed as a curved surface with both ends protruding forward toward the center so as to support the waist of the user and to cover the side portion.

Here, at least one elastic slit 43 may be formed on the upper end of the pedestal 41.

For example, the elastic slits 43 may be formed on both sides of the pedestal 41 so as to be inclined upward so that the upper end of the pedestal 41 may be elastically deformed toward the rear in accordance with the pressing force of the user.

As described above, according to the present invention, an elastic slit is formed in the lumbar support to elastically deform the pedestal according to the pressing force of the user, thereby comfortably supporting the waist of the user.

The connecting portion 42 is formed in a substantially rectangular plate shape and is formed so as to be bent in a forward direction so as to have a shape as viewed from the side such that the pedestal 41 is disposed forward of the boss portion 22 of the frame 20 .

A coupling hole 44 may be formed at a central portion of the connection portion 42 so that a fixing bolt for fixing the fixing module 50 to the boss portion 22 is fastened.

The engagement holes 44 extend in the vertical direction and the vertical movement of the lumbar support 40 can be limited to the length of the engagement holes 44 in the vertical direction.

A pair of engagement guides 45, which are respectively coupled to the spaces formed between the two pairs of the movement guides 23 formed on the boss portion 22, are projected rearward to extend in the vertical direction on the rear surface of the connection portion 42 .

The fixing module 50 is formed in a substantially hexahedral shape and a through hole 51 may be formed at the center of the fixing module 50 so that a fixing bolt is penetratively coupled and fastened to the fastening portion of the boss 22.

The rear surface of the fixing module 50 may be inclined upward toward the front side so as to adjust the degree of protrusion of the lumbar support 40 when the lumbar support 40 is moved up and down.

That is, the fixing module 50 may be tapered so as to decrease in thickness from the lower end to the upper end.

As described above, according to the present invention, the lumbar support can be mounted on the frame so as to be movable up and down to adjust the height of the lumbar support according to the user's posture and work environment.

In the present invention, the rear surface of the boss portion and the fixing module are formed to be inclined, respectively, so that the lumbar support can be adjusted in height along with the height of the lumbar support when the lumbar support is moved up and down.

Next, the joining relationship and operation method of the chair back according to the preferred embodiment of the present invention will be described in detail.

The operator assembles the lumbar pedestal 40 and the fixing module 50 in the boss portion 22 formed in the lower frame 21 disposed at the lower end of the frame 20 of the backrest 13. [

A pair of coupling guides 45 formed on the rear surface of the coupling portion 42 of the lumbar support 40 are coupled to a space between two pairs of movement guides 23 formed on the front surface of the boss portion 22, And the fixing module 50 is disposed on the front surface of the connecting portion 42. [

The worker inserts the fixing bolts into the fastening portions 24 formed in the boss portion 22 after passing through the fastening holes 51 of the fastening module 50 and the fastening holes 44 of the fastening portions 42, The module 50 and the lumbar support 40 are fixed.

Here, the lug 44 of the connection portion 42 is formed as a long hole, so that the lumbar support 40 can be slid up and down along the fixing module 50 and the boss portion 22.

When the assembling of the lumbar pedestal 40, the fixing module 50 and the frame 20 is completed, the operator places the seat 32 and the seat frame 31 on the front surface of the frame 20 Thereafter, the seat frame 31 is engaged with the frame 20 to fix the seat 32.

The operator completes the assembly of the chair 10 by assembling the backrest 13 to the seat 11 or the rear end of the assembly 14 and assembling the leg 11 at the bottom of the assembly 14 .

5 and 6 are operational state diagrams of a chair back according to a preferred embodiment of the present invention.

The lumbar support 40 can be moved in the vertical direction by a force applied from the user in a state where the lumbar support 40 is fixed to the boss portion 22 by the fixing module 50. [

That is, as shown in FIG. 5, as the lumbar support 40 descends to the lower end of the boss portion 22, the lumbar support 40 moves rearward, and the degree of protrusion toward the front is reduced.

6, the rear surface of the fixing module 50 and the boss portion 22 are formed to be inclined forward, respectively, so that the lumbar support 40 is moved forward toward the upper end of the boss portion 22 As shown in Fig.

As described above, according to the present invention, the height of the lumbar support can be adjusted by moving the lumbar support in the vertical direction, and the degree of protrusion can be adjusted.

Accordingly, the present invention can provide comfort and comfort to the user by adjusting the height and the degree of protrusion of the lumbar support according to the shape, posture, and work environment of the user's waist.

Although the invention made by the present inventors has been described concretely with reference to 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.

The present invention is applied to a chair technique capable of controlling the height of the lumbar support by vertically moving the lumbar support and adjusting the degree of protrusion to the front.

10: Chair 11: Leg
12: seat portion 13: backrest
20: Frame 21: Lower frame
22: Boss Part 23: Moving Guide
24: fastening part 30: seat part
31: sheet frame 32: sheet
33: coupling portion 40: lumbar support
41: pedestal 42:
43: elastic slit 44: engaging hole
45: engaging guide 50: fixed module
51: Through hole

Claims (5)

A frame formed in a rectangular frame shape,
A seat portion provided in the front or inside space of the frame,
A lumbar support which is formed in a shape corresponding to the shape of the waist of the user and supports the waist portion,
And a fixing module for fixing the lumbar support to the frame so as to adjust the height and the degree of protrusion,
The lumbar support includes a pedestal supporting the waist of the user
And a connecting portion extending downward from a lower end of the pedestal and movably coupled to a boss portion formed in a lower frame forming a lower end portion of the frame in a vertical direction,
A fixing bolt for fixing the fixing module to the boss unit is formed at a central portion of the connecting portion so that the degree of protrusion can be adjusted in the process of ascending and descending with respect to the fixing module,
And two pairs of movement guides extending in the vertical direction are provided on the front surface of the boss unit to guide upward and downward movement of the connection unit,
And a coupling guide coupled to the space between the two pairs of the movement guides is formed on the rear surface of the connection portion. The method according to claim 1,
Wherein the back surface and the boss portion of the fixing module are inclined so as to protrude toward the user's waist toward the upper end. delete delete 3. The method according to claim 1 or 2,
The pedestal is protruded from the upper and lower ends so as to correspond to the shape of the user's waist when viewed from the side. Both ends of the pedestal protrude forward in comparison with the central portion to support the waist of the user when viewed from above, And is formed into a curved surface,
Wherein at least one elastic slit is formed on an upper end of the pedestal.

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