KR101670655B1 - Back of chair - Google Patents

Abstract

A seat for a chair comprising: a frame formed in a rectangular frame; a seat provided on a front surface or an inner space of the frame; a lumbar support formed in a shape corresponding to a shape of a waist of a user to support a waist portion; And a resilient means provided between the bracket and the lumbar support so as to elastically support the lumbar support so as to provide an elastic force, An elastic means is provided between the lumbar support and the bracket so that the degree of protrusion of the lumbar support can be selectively adjusted according to the user's body shape and posture.

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 backrest for a chair which is simple in structure and can improve workability.

Another object of the present invention is to provide

.

In order to achieve the above object, a chair back according to the present invention is formed in a shape corresponding to a shape of a waist of a user, a frame formed in a rectangular frame, A bracket coupled to both sides of the frame to support the lumbar support, a bracket to which the lumbar support is adjustably coupled to the lumbar support, and a bracket installed between the lumbar support and the bracket to elastically support the lumbar support And elastic means for providing an elastic force.

Wherein the lumbar support includes a pedestal for supporting a waist of a user, a pad coupled to a front surface of the pedestal, and a support member provided between the pad and the pedestal, wherein the bracket includes a horizontal portion And a vertical portion connected to a center portion of the horizontal portion and having a lower end coupled to a lower end of the frame, wherein a first engaging portion and a second engaging portion are formed on a rear surface of the pedestal and a front surface of the horizontal portion, .

Wherein the first engaging portion is formed with an insertion groove portion in which a space is formed therein and a coupling protrusion is formed in the second engaging portion so as to be insertable into the insertion groove portion through the insertion hole of the insertion groove portion, And an installation space in which the elastic means is installed is provided between the engaging part and the engaging projection part.

The maximum protruding distance is limited by the fastening bolt inserted through the front surface of the insertion groove portion of the first and second coupling portions. When the lumbar support is pressed by the user, the coupling distance between the first coupling portion and the second coupling portion The protruding distance of the lumbar support is adjusted while the pressing force of the user is released and the protruding distance of the lumbar support is returned to its original position by the elastic force of the elastic means.

As described above, according to the chair back according to the present invention, an elastic means is provided between the lumbar support and the bracket, so that the degree of protrusion of the lumbar support can be selectively controlled according to the user's body shape and posture.

Further, according to the present invention, it is possible to simplify the structure of the coupling between the lumbar support and the bracket and to simplify the structure of the product, thereby improving the workability in manufacturing the chair back 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;
2 is an exploded perspective view of a chair back according to a preferred embodiment of the present invention,
Fig. 3 is an exploded perspective view showing the chair back shown in Fig. 2 from another angle, Fig.
Fig. 4 is a cross-sectional view of the lumbar support and bracket shown in Fig. 2,
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 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 back according to a preferred embodiment of the present invention includes a leg portion 11 having a plurality of wheels, a seat portion 11 connected to an upper side of the leg portion 11, (12) and a backrest (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. [

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

FIG. 2 is an exploded perspective view of a chair back according to a preferred embodiment of the present invention, and FIG. 3 is an exploded perspective view showing the chair back shown in FIG. 2 from another angle.

1 to 3, the 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, (21), a lumbar support (22) formed in a shape corresponding to the shape of the waist of the user and supporting the waist portion, and a lumbar support (22) coupled to both sides and the lower end of the frame and using elastic means And a bracket 23 for supporting the wrist.

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. [

The sheet 21 may be formed in a shape corresponding to the front surface of the frame 20. [

The seat 21 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 and is stretched so as to have elasticity to support the waist and back of the user comfortably And can be fixed to the front surface or the inner space of the frame 20 by the seat frame formed in a substantially rectangular frame shape.

The seat frame may be formed by bending toward the front in correspondence with the shape of the waist of the user and using a thin thin plate so that the lumbar support 23 can be moved forward and backward by the elastic means 24 .

The lumbar support 22 includes a pedestal 30 for supporting the user's waist and a pad 31 coupled to the front of the pedestal 30 and a support member 32 provided between the pad 31 and the pedestal 30, . ≪ / RTI >

The folded portion 33 may be formed on the rear outer surface of the pad 31 so as to be coupled to the front surface of the pedestal 30 coupled to the bracket 23.

The pedestal 30 may be formed in a substantially rectangular shape and a pair of first engaging portions 34 coupled to the bracket 23 may be formed on the rear surface of the pedestal 30.

4 is a cross-sectional view of the lumbar support and bracket shown in Fig. 2

As shown in Figs. 2 to 4, each of the pair of first engaging portions 34 may have a substantially cylindrical shape, and may be spaced apart from each other by a predetermined interval in the horizontal direction.

An insertion groove 35 in which a space is formed is formed in each first coupling portion 34 so that a coupling protrusion 44 formed in the second coupling portion 43 of the bracket 23 described below can be inserted therein .

The insertion groove 35 may be formed in a substantially cylindrical shape and an insertion hole may be formed in the rear surface of the insertion groove 35 to receive the coupling protrusion 44.

The insertion groove portion 35 may be fixed to the engaging protrusion portion 44 by a fastening bolt inserted through the front surface and fastened to the engaging protrusion portion 44.

As described above, the maximum length of the first and second engaging portions 34 and 43, that is, the maximum protruding distance of the lumbar support 22, can be limited as the insertion groove portion 35 and the engaging protrusion portion 44 are combined .

The bracket 23 is connected to a central portion of the horizontal portion 41 and a horizontal portion 41 to which both ends of the frame 20 are coupled at both sides of the frame 20 so that the bracket 23 has a substantially ' And a vertical portion 42 coupled to the lower end of the base portion 42.

A pair of second engaging portions 43 may be formed on the front surface of the horizontal portion 41 so as to be coupled to the pair of first engaging portions 34, respectively.

The pair of second engaging portions 43 are each formed in a substantially cylindrical shape and may have an outer diameter equal to or slightly smaller than the inner diameter of the first engaging portion 34 so as to be insertable into the first engaging portion 34 have.

The engaging protrusions 44 may be formed in the respective second engaging portions 43 so as to be inserted into the inserting grooves 35 through the insertion holes of the insertion grooves 35 formed in the first engaging portions 34 .

Each coupling protrusion 44 is formed in a substantially cylindrical shape and a coupling groove in which a thread is formed on an inner circumferential surface of the coupling protrusion 44 may be extended from the front surface of the coupling protrusion 44 to the rear side.

An installation space may be formed between the inner surface of the second engaging portion 43 and the outer surface of the engaging protrusion 44 to provide an elastic means 24.

The front end of the elastic means 24 is supported on the rear end surface of the insertion groove 35 and the rear end of the elastic means 44 is supported on the rear surface of the second And is supported on the rear surface of the installation space inside the engaging portion 43 to provide an elastic force to the lumbar support 22.

That is, when the lumbar support 22 is pushed rearward by the user, as the first engaging portion 34 moves toward the second engaging portion 44, the resilient means 24 is elastically deformed to decrease in length And elastically supports the lumbar support 22.

Through this process, the protruding distance of the lumbar support 22 can be adjusted.

As described above, according to the present invention, elastic means is provided between the lumbar support and the bracket so that the degree of protrusion of the lumbar support can be selectively adjusted according to the user's body shape and posture.

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

Both ends of the horizontal portion 41 of the bracket 23 are fixed to both sides of the frame 20 and the lower end of the vertical portion 42 is fixed to the lower end of the frame 20. [

The elastic means (24) are provided on the pair of second engaging portions (43) formed on the horizontal portion (41).

At this time, the elastic means 24 is inserted into an installation space between the inner surface of each second engaging portion 43 and the outer surface of the engaging protrusion 44.

Then, a pair of first engaging portions 34 formed on the back surface of the pedestal 30 of the lumbar support 22 are respectively engaged with the second engaging portions 43. [

In this state, each of the insertion groove portions 35 formed in each of the first engaging portions 34 is fixed to the engaging protrusions 44 by the fastening bolts in a state of being movable in the backward direction with the engaging protrusions 44 inserted therein. do.

The elastic means 24 can support the lumbar support 22 elastically by supporting the front end and the rear end of the elastic means 24 on the lower end surface of the insertion groove 35 and the rear surface of the installation space, respectively.

The supporting member 32 is disposed on the front surface of the pedestal 30 and the supporting member 32 and the outer frame of the pedestal 30 are inserted into the bent portion 33 formed along the outer surface of the rear surface of the pad 31, (22) is completed.

Finally, the seat 21 is joined to the frame 20 using the seat frame.

When the backrest 13 is assembled, the lower end of the backrest 13 is engaged with the rear end of the seat portion 12 and the lower portion of the seat portion 12 and the upper portion of the backrest 13 are engaged with legs The assembly of the chair 10 is completed by joining the portion 11 and the headrest 14 together.

4 to 6, a method of operating a chair back according to a preferred embodiment of the present invention will be described in detail.

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

FIG. 5 shows a state in which the lumbar support is maximally protruded, and FIG. 6 shows a state in which the lumbar support is moved to the rear side and the degree of protrusion is adjusted.

5, the first engaging portion 34 of the lumbar support 22 is urged by the resilient force of the resilient means 24 so that the protruding degree of the second engaging portion 43 of the bracket 23 becomes maximum (D), as shown in Fig.

6, when the user presses the lumbar support 22 against the back of the chair by pressing the back and back portions backward, the first engagement portion 34 of the lumbar support 22 is pivoted to the bracket 23, the resilient means 24 resiliently deforms to reduce its length and resiliently supports the lumbar pedestal 22.

The protrusion distance d of the first engaging portion 34 and the second engaging portion 43 is reduced as compared with the maximum protrusion distance D The degree is controlled.

On the other hand, when the user moves the waist and back part forward to reduce the pressing force applied to the back for the chair or to remove the pressing force, the lumbar support 22 is elastically deformed by the elastic force of the elastic means 24, Quot;

As described above, according to the present invention, elastic means is provided between the lumbar support and the bracket, and the degree of protrusion of the lumbar support can be selectively adjusted according to the user's body shape and posture.

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 backrest technique for selectively adjusting the degree of projection of a lumbar support using an elastic means provided between a lumbar support and a bracket.

10: Chair 11: Leg
12: seat portion 13: backrest
14: headrest 20: frame
21: Sheet 22: Lumbar support
23: Bracket 24: Elastic means
30: pedestal 31: pad
32: support member 33:
34: first engaging portion 35:
41: horizontal part 42: vertical part
43: second engaging portion 44: engaging projection

Claims (4)

A frame formed in a rectangular frame shape,
A sheet installed 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,
A bracket coupled to both sides and a lower end of the frame and having a lumbar support which is adjustable in projecting distance;
And elastic means provided between the lumbar support and the bracket so as to elastically support the lumbar support to provide an elastic force,
The lumbar support includes a pedestal supporting the waist of the user
A pad coupled to a front surface of the pedestal and
And a support member provided between the pad and the pedestal,
The bracket includes a horizontal portion to which both ends are coupled at both sides of the frame,
And a vertical portion connected to a center portion of the horizontal portion and having a lower end coupled to a lower end of the frame,
A bent portion bent toward the rear side is formed on the rear surface of the pad so as to be engageable with the front surface of the pedestal coupled to the bracket,
A first engaging portion and a second engaging portion are formed on the rear surface of the pedestal and the front surface of the horizontal portion, respectively,
Wherein an insertion groove portion in which a space is formed is formed in the first engagement portion,
Wherein a coupling protrusion is formed in the second coupling portion to be insertable into the insertion groove through an insertion hole formed in a rear surface of the insertion groove,
Wherein a space for installing the elastic means is provided between the second engaging portion and the engaging projected portion. delete delete The method according to claim 1,
The maximum protruding distance is limited by the fastening bolt through which the first and second engaging portions are inserted through the front surface of the insertion groove portion,
Wherein when the lumbar support is pressed by a user, a distance of engagement between the first engaging portion and the second engaging portion is reduced and the protruding distance of the lumbar support is adjusted,
Wherein when the pressing force of the user is released, the maximum returning distance is returned to the original position by the elastic force of the elastic means.

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