JPH10211050A - Lumbar support - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable a sitter to have comfortable abutting feeling, by forming a lumbar support to be fit on the backrest part of a chair into a bent shape so that right and left side parts come in front in plane view than the central part and upper and lower parts come in rear in side view. SOLUTION: The backrest main body of a chair is made by wrapping a cushion body with a surface leather material and a gap is formed on the front face to tensely equip an outer leather material. A properly flexible laterally long plate-like lumbar support 8 made of synthetic resin is inserted into the gap. The lumbar support 8 is formed into a bent shape so that the waist back face of a sitter can properly abut on, right and left side parts come in front more than the central part in plane view, and upper and lower parts in rear in side view. Plural notches 9 are equipped on the proper places on the upper and lower edges of the lumbar support 8 to form local proper flexible parts on proper places in the lateral direction of the lumbar support.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lumbar support which is mounted on a portion of a backrest of a chair where the waist of a occupant abuts and which appropriately supports the back of the occupant's waist.

[0002]

2. Description of the Related Art Conventional lumbar supports are disclosed in, for example, Japanese Utility Model Publication No. 1-8214 and Japanese Utility Model Application Laid-Open No. 57-1725.
No. 36, for example.

[0003] These conventional lumbar supports all have a complicated structure such as providing a cushioning material at least on the front surface of a hard core material and further covering the surroundings with a skin material, which makes production difficult and expensive. There is.

[0004]

SUMMARY OF THE INVENTION In view of the above problems of the prior art, the present invention has a simple structure, adapts to the shape of the waist of the occupant, and has an ideal elastic bending property. An object of the present invention is to provide a lumbar support that can be manufactured and that can be easily manufactured so as to provide a comfortable sensation of contact to a occupant.

[0005]

According to the present invention, the above-mentioned problem is solved as follows. (1) A lumbar support that is attached to a portion of the backrest of the chair where the waist of the occupant abuts, which is formed of an elastically deformable material, and whose left and right sides are forward from the center in plan view. In addition, the upper and lower portions are curved so as to be located rearward of the central portion in a side view.

(2) In the above item (1), an easily bendable portion is locally formed by providing a small cross-sectional area at an appropriate position in the left-right direction.

(3) In the above item (2), a small cross-sectional area portion is formed by providing a cut in the upper edge or the lower edge in a vertical direction.

(4) In the above item (2) or (3), a small cross-sectional area portion is formed by providing a hole or a recess at an intermediate portion in the vertical direction.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS As shown in FIGS. 1 and 2, a backrest body (1) of a chair comprises a cushion body (2) and a skin material (3).
A space (4) having a slightly larger vertical dimension is provided on the front surface thereof, and a skin material (5) is stretched.

Notches (6) and (6) are provided below the left and right side edges of the outer cover material (5), and are long in the up-down direction and the inner edges are substantially vertical. As shown in FIG. 7, on the inner edge of the cutout portion (6), a bead (7) is provided following the left and right side edges of the outer cover material (5).

In the gap (4), the vertical dimension is
A horizontally long plate-shaped lumbar support (8) made of synthetic resin having a size smaller than the vertical dimension of the gap (4) and having appropriate flexibility is inserted.

The lumbar support (8) is gently concavely bent rearward in a plan view and forwardly in a side view so that the back of the waist of the occupant can appropriately abut.
A plurality of cuts (9) are provided at appropriate locations on the upper and lower edges to provide preferable flexibility (see FIGS. 3 to 5).

That is, the lumbar support (8) is formed of an elastically deformable material, and the left and right sides are forward from the center in plan view, and the upper and lower parts are closer to the center in side view. It is curved to be backward. Also, by providing a plurality of cuts (9) at appropriate positions on the upper and lower edges of the lumbar support (8), this portion is made into a small cross-sectional area portion, and a local flexible part is provided at an appropriate position in the left-right direction of the lumbar support (8). The music part is formed.

A rectangular hole (24) is formed in the center of the lumbar support (8), and the portion provided with the hole (24) is also a small cross-sectional area. In particular, the hole (24) also has a function as a release hole for releasing a projection such as a backbone of a seated person or a sewing portion of clothes. Instead of the hole (24), a recess may be provided which is recessed rearward from the front surface of the lumbar support (8).

The lumbar support (8) has such a length that its side end is exposed into the notch (6). As shown in FIG. 6, the lumbar support (8) has a side edge of its main body (10). Peripheral wall (11) that faces forward and whose upper and lower edges extend slightly inward,
The outer wall (11) is provided with an outward V-shaped narrow groove (12) inside.

The portion surrounded by the slot (12) is the inward tongue (1).
3), and outward holes (14) (14) above and below the slot (12)
Slightly inward of the outer end of the lumbar support (8), there are provided substantially vertical engagement holes (15) and (16) that bite into the body (10) side and the inward tongue piece (13) side.

When the lumbar support (8) is inserted into the gap (4), the positions of the engagement holes (15) and (16) are determined by the outer cover material (5).
Is formed so as to overlap with the bead (7) at the inner edge of the notch (6), and has a width substantially equal to the width of the bead (7).

Adjacent to the inner edge of the peripheral wall (11), the main body (10) of the lumbar support (8) has vertically arranged mounting holes (17) (17).
Is provided.

(18) is a flat box-shaped cover facing rearward.
Outer side portion (19) that can be properly fitted to the outer surface of the peripheral wall (11)
And an inward V-shaped inner side portion (20) that can cover the slot (12).
And are connected at substantially horizontal upper and lower sides (21) and (21), and a cover piece (22) is provided over these sides,
In the vicinity of the upper and lower sides (21) (21), the cover piece (22) is provided with rearward locking claws (23) (23) that can be inserted and locked into the mounting hole (17).

The lumbar support (8) is inserted into the gap (4), and as shown in FIG. 7, the substantially vertical engagement holes (15) and (15) above and below the slot (12) are inserted into the bead (7). ) On the back side, and the inward tongue (1
3) is elastically bent and superimposed on the front surface of the outer cover material (5).
As a result, of the engagement holes (15) and (16), the one (16) on the inward tongue piece (13) side is in front of the bead (7), and the one (15) on the body (10) side is also The lumbar support (8) is fitted and locked to the rear surface of the bead (7), thereby preventing unintentional movement of the lumbar support (8) in the vertical and horizontal directions.

[0021]

【The invention's effect】

(a) It can be easily manufactured by a single member, can draw a three-dimensional curve that conforms to the three-dimensional shape of the waist of the seat, and always has a curved surface portion in contact with the waist of the seat, such as upper and lower edges. The corners do not come into contact with the waist of the occupant, so that the occupant can feel comfortable.

(B) According to the second aspect, the lumbar support promotes elastic deformation in the small cross-sectional area,
Ideal elastic flexibility is obtained. In particular, when the lumbar support is curved so that the upper and lower portions are rearward from the central portion in a side view, the central portion of the lumbar support is less likely to bend in the front-rear direction. By disposing them in the appropriate places, the above-mentioned difficulty in bending can be eliminated, and ideal elastic bending properties can be obtained.

(C) According to the third aspect, by providing the cut, the connection of the upper edge or the lower edge in the left-right direction can be cut off, and the central portion of the lumbar support can be easily bent in the front-rear direction.

(D) According to the fourth aspect, it is possible to form an easily bendable portion at an appropriate position of the lumbar support while keeping the upper edge or the lower edge continuous in the left-right direction.

[Brief description of the drawings]

FIG. 1 is a front view of a chair provided with a backrest according to the present invention.

FIG. 2 is a vertical sectional side view taken along the line II-II in FIG.

FIG. 3 is a front view of the lumbar support main body.

FIG. 4 is a cross-sectional plan view taken along line IV-IV in FIG.

FIG. 5 is a side view of the lumbar support main body.

FIG. 6 is an enlarged perspective view of a side end of a lumbar support and a cover.

FIG. 7 is an enlarged perspective view showing a side end portion and a cover of the lumbar support in a mounted state.

[Explanation of symbols]

 (1) Backrest body (2) Cushion body (3) Skin material (4) Gap (5) Skin material (6) Notch (7) Ball (8) Lumbar support (9) Cut (10) Body (11) ) Peripheral wall (12) Slot (13) Inward tongue (14) Outward hole (15) (16) Engagement hole (17) Mounting hole (18) Cover (19) Outer side (20) Inner side (21 ) Upper and lower sides (22) Cover piece (23) Locking claw (24) Hole

Claims (4)

[Claims] 1. A lumbar support mounted on a portion of a backrest of a chair where a waist of a occupant abuts, the lumbar support being formed of an elastically deformable material, and left and right sides in front of a central portion in plan view. A lumbar support characterized in that the lumbar support is curved so that the upper and lower portions are located rearward of the central portion in a side view. 2. The lumbar support according to claim 1, wherein an easily flexible portion is formed locally by providing a small cross-sectional area portion at an appropriate position in the left-right direction. 3. A small cross-sectional area portion is formed by providing a cut in an upper edge or a lower edge in a vertical direction.
Lumbar support as described. 4. A lumbar support according to claim 2, wherein a small cross-sectional area is formed by providing a hole or a recess at an intermediate portion in the vertical direction.