JPH08299097A - Chair - Google Patents

Abstract

PURPOSE: To provide a chair concurrently having the merit of a plane-shaped backrest and the merit of a backrest with a curved face. CONSTITUTION: When a seat is vacant, the front and back faces of a backrest are kept at a plane shape, and three springs 9, 10, 11 are arranged on nearly the same plane with no load. When the seat is occupied, the vertebra section of a seated person is fixed by a lower end fixed frame 7 and an intermediate fixed frame 8, and the springs 9, 10, 11 are warped by the load of the seated person along the vertebra section while it is used as a fulcrum. The springs 9, 10, 11 have the same pitch and whole length, they are made thinner in this order, i.e., the spring 9 is the biggest and the spring 11 is the thinnest, the spring 11 is warped the most, and the springs 10, 9 are warped less in this order. The upper section of the backrest can be curved by the warps according to the curved vertebra section of the seated person. Since the vertebra section is stabilized, the fatigue of the seated person is reduced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to improvement of chairs, especially chairs for bleachers installed mainly in halls, gymnasiums, stadiums and the like.

[0002]

2. Description of the Related Art As a conventional chair, a chair shown in FIG. 6 (a) is a synthetic rubber plate-like member with two metal connecting bars 27 between the left and right side frames 25, two on each of the left and right sides. The body 26 is installed. In the chair shown in FIG. 6B, a hard plastic plate-like body 29 is installed between the left and right side frames 28, 28 with a metal coil spring 30 interposed therebetween. Also, the backrest is flat (Fig.
(A), FIG. 8 (a)) and a backrest having a curved surface that is substantially aligned with the curved line of the spine of the seated person (FIG. 7 (b), FIG. 8).
(B))

[0003]

In the chair shown in FIG. 6 (a), the flexure of the plate-like body 26 under load does not change between upper, lower and middle, so that it can be adapted to the entire spine of a curved seated person. In addition, there was a drawback that it was easily deformed when a load was applied from above the backrest. In the chair shown in FIG. 6B, it is difficult to change the load deflection of the plate-like body 29 in the upper, lower, and middle portions, and the plate-like body 2
It is difficult to fit the entire spine of a curved seated person, since the parts that make up surface 9 do not flex. Figure 7
The flat backrest shown in (a) has an advantage that a wide width D of a passage between front and rear chairs can be secured when the depth L per seat is constant, but it has a difficulty in sitting comfort. On the other hand, the backrest having the curved surface shown in FIG. 7B is excellent in sitting comfort, but when the depth L per seat is constant, the width d of the passage is narrowed (d <D). There were difficulties. 8A and 8B show a moving floor (only a part of which is shown) in a state where the chairs are housed, the flat back is As shown in FIG. 8A, although the height h of the storage space can be reduced, there is a difficulty in sitting comfort. On the other hand, the backrest having the curved surface is excellent in sitting comfort, while FIG.
As shown in (b), the height H of the storage space becomes large (H>
There was a problem called h). It is an object of the present invention to provide a chair having both the advantages of a flat backrest and the advantages of a backrest having a curved surface.

[0004]

To achieve the above object, according to the present invention, in claim 1, a frame in which parallel left and right side frames are connected by a lower fixed frame is fitted to the frame. In a chair having a planar backrest composed of a cushion material, a plurality of steps of elastic repellent material is installed above the fixed frame between the left and right side frames, and the load deflection of the elastic repellent material is above the lower backrest. It was solved by the chairs that are said to be large one by one. According to a second aspect of the present invention, in the chair according to the first aspect, the elastic repellent material may be a corrugated spring in one plane, and the pitch of the spring may be larger on the backrest upper side than on the backrest lower side. According to a third aspect of the present invention, in the chair according to the first aspect, the elastic material is a wave spring in one plane, and the total length of the spring can be larger on the backrest upper side than on the backrest lower side. According to a fourth aspect of the present invention, in the chair of the first aspect, the elastic material may be a corrugated spring within one plane, and the thickness of the spring may be smaller on the backrest upper side than on the backrest lower side. According to claim 5,
In the chair according to any one of claims 2 to 4, a connecting member can be installed between the springs. According to a sixth aspect, in the chair according to the first aspect, the elastic material may be a rubber plate-shaped body.

The present invention can be applied not only to a chair fixed to the floor but also to a chair provided on a retractable staircase seat so that it can stand and fall. The number of steps of the plurality of steps of the repellent material used in the present invention is not particularly limited, but the cost increases if the number of steps is large.
3 to 3 stages are preferable, and in terms of general-purpose backrest size, 3 stages are particularly preferable in terms of balance. The in-plane corrugated spring used in the present invention is made of, for example, spring steel, phosphor bronze or the like, and has a substantially circular cross section, but spring steel is the cheapest, has the highest durability, and is easy to use. The rubber plate used in the present invention is, for example, natural rubber or synthetic rubber (SBR, NB
R, etc.), but synthetic rubber is the cheapest, has the highest durability, and is easy to use.

[0006]

The chair of the present invention is flat and has a smaller thickness than a conventional backrest chair having a curved surface when the bleachers are folded and stored in a storage space, and even if the number of bleachers is increased. The storage space and equipment costs can be saved. Also, when the whole is extended and deployed and used, it flexes according to the load to the spine of the occupant, so it is comfortable to sit on and the spine is stable, so there is less fatigue to the occupant. .
Further, as the elastic material, a corrugated spring in one plane of each size and a rubber plate-like member can be selected according to the backrest, so that the structure is simple and the above effect can be achieved. Further, by arranging the upper and lower connecting members between the springs, it is possible to obtain the effect of dispersing and relaxing the bending of the spring when a load is applied in the vertical direction from the upper part of the backrest.

[0007]

An embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a schematic side view of an example of a chair of the present invention, showing (a) an empty seat and (b) a sitting seat. FIG. 2 is a schematic perspective view of an essential part of a backrest used in the chair of FIG. FIG. 3 is a schematic explanatory view of a main part of another example of the backrest used in the chair of the present invention. FIG. 4 shows another example (a) of the backrest used in the chair of the present invention.
It is a principal part schematic explanatory drawing of (b) (c). FIG. 5 is a schematic explanatory view of a main part of another example of the backrest used in the chair of the present invention. FIG. 6 is a schematic explanatory view of a main part of each example (a) and (b) of a conventional backrest of a chair. FIG. 7: is a schematic explanatory drawing of each example (a) (b) of the backrest of the conventional chair. FIG. 8 is a schematic explanatory diagram of each example (a) and (b) of a backrest in a retracted state of a chair provided in a conventional telescopic staircase.

In FIGS. 1 and 2, a chair 1 has a base 3 on which a seat 3 and a backrest 4 are mounted and supported. Back 4 is
It is composed of a metal frame 6 having a rectangular contour, a cushion material 19 made of urethane foam fitted into the frame 6, and a thick surface covering material (covering material) 5 for covering the front and back surfaces. The frame 6 has side frames 16 and 16 symmetrically facing the left and right ends and having a U-shape and an inverted U-shape, and a lower end fixed frame 7 fixed to the lower end across both side frames 16 and 16.
And an intermediate fixed frame 8 fixed to both sides of the side frames 16 and 16 at an intermediate portion, and an upper end fixing cap 17 fitted to the upper end of both side frames 16 and 16 and fitted.
Has become The rear side of the side frames 16, 16 is slightly longer than the front side, and the side frame 1
A pair of locking pieces 1 having a cylindrical partial cutout shape in the vertical direction with a space from the upper end at symmetrical positions on the rear side of 6 and 16.
Three stages of 3, 14, and 15 are fixed, and each locking piece 1
Both ends of the corrugated springs 9, 10 and 11 in one plane made of spring steel and having a substantially circular cross section are fitted and inserted into the springs 3, 1 and 15, respectively.
Three stages of 0 and 11 are stretched. In this embodiment, the springs 9, 10 and 11 have the same pitch and the same overall length, the spring 9 has the largest thickness, and the springs 10 and 11 sequentially have the smallest thickness. Further, connecting members 12, 12 fixed by a fixing ring 18 are installed at symmetrical positions between the springs 9, 10, 11.

In FIG. 3, in the embodiment of FIGS. 1 and 2, the middle-stage spring 10 of the three-stage springs 9, 10 and 11 is eliminated, and the two-stage springs 9 and 11 include a pair of locking pieces 13 ,. It is stretched between two stages of 15. Connecting members 12, 12 fixed by a fixing ring 18 are installed at symmetrical positions between the springs 9, 11. In this embodiment, the springs 9 and 11 have the same pitch and the same overall length, and the springs 9 and 11 have the largest thickness and the smallest thickness.

In FIG. 4, similarly to the embodiment of FIG. 3, springs 9 and 11 are stretched between two stages of a pair of locking pieces 13 and 15, and a connecting member 12 fixed between the springs 9 and 11, The simplest example of eliminating 12 is shown below. In (a), the pitch of the spring 9 is larger than that of the spring 11, and the thickness and length of each spring are the same. In (b), the total length of the spring 9 is smaller than that of the spring 11, each spring has the same thickness and pitch, and the spring 9 is stretched to be stretched between the pair of locking pieces 13. (C) The spring 9 is thicker than the spring 11, and the total length and pitch of each spring are the same.

In FIG. 5, in place of the springs of the embodiment shown in FIGS. 1 to 4, two lower metal bars 23 are provided between the left and right side frames 20, 20 to which the intermediate fixing frame 8 is fixed. A synthetic rubber plate-shaped body 21 is installed on the upper side, and a synthetic rubber plate-shaped body 22 is installed on the upper stage. Here, the material is selected so that the load deflection of the upper rubber plate-like body 22 is larger than the load deflection of the lower rubber plate-like body 21.

With reference to FIG. 1, the operation of an example of the chair according to the present invention in the case of (a) vacant seat (b) seated will be described. When the seat is vacant, the front and rear surfaces of the backrest 4 are both kept flat, and the three springs 9, 10 and 11 are arranged on the same plane with no load. At the time of sitting, the spine part of the seated person is fixed by the lower end fixed frame 7 and the intermediate fixed frame 8, and the springs 9, 10 and 11 bend along the spine part due to the load of the seated person. Passing springs 9, 10, 1
No. 1 has the same pitch and the same length, the spring 9 has the largest thickness, and the springs 10 and 11 have the smallest thickness, so that 11 is the thinnest. It decreases gradually. Due to this bending, the upper part of the backrest 4 can be curved in accordance with the spinal portion of the seated person who is substantially curved.

The embodiment shown in FIGS. 3-4 comprises a three-stage spring 9,
Of the ten and eleventh, the middle-stage spring 10 is abolished, and the two-stage springs 9 and 11 are provided.
Since the spring 11 is made larger, the flexure allows the upper part of the backrest 4 to be curved in accordance with the spine of a substantially curved seated person. In addition, the connecting members 12 and 12 shown in FIGS.
Has a function to disperse and alleviate the flexure of the spring when a load is applied to it. For example, the vertical flexures Y, Y shown in FIG. 3 are reduced to approximately 1/2 as compared with the case without the connecting members 12, 12. be able to. In the embodiment shown in FIG. 5, the load deflection of the upper rubber plate 22 on the backrest 4 is larger than the load deflection of the lower rubber plate 21. Similar to the two springs of 4, the upper portion of the backrest 4 can be curved to accommodate the substantially curved spine of the occupant.

[0014]

The chair of the present invention is flat and has a smaller thickness than a conventional backrest chair having a curved surface when the bleachers are folded and stored, and can be stored even when the number of bleachers increases. The space and equipment cost of the place can be saved. Also, when the bleaching seat is extended and deployed, it bends according to the load to the seated person's spine, which makes it comfortable to sit on, and the spine is stable, resulting in fatigue of the seated person. Less is. Further, as the elastic material, a wavy spring within a plane of each size and a rubber plate can be selected according to the backrest, so that the structure is simple. Further, by installing the upper and lower connecting members between the springs, it is possible to disperse and alleviate the bending of the spring when a load is applied in the vertical direction from the upper part of the backrest.

[Brief description of drawings]

FIG. 1 is a schematic side view of an example of a chair of the present invention, showing (a) an empty seat and (b) a sitting seat.

FIG. 2 is a schematic perspective view of a main portion of a backrest used in the chair of FIG.

FIG. 3 is a schematic explanatory view of a main part of another example of the backrest used in the chair of the present invention.

FIG. 4 is another example (a) of the backrest used in the chair of the present invention.
It is a principal part schematic explanatory drawing of (b) (c).

FIG. 5 is a schematic explanatory view of a main part of another example of the backrest used in the chair of the present invention.

FIG. 6 is a schematic explanatory view of a main part of each example (a) and (b) of a backrest of a conventional chair.

FIG. 7 is a schematic explanatory diagram of each example (a) and (b) of a backrest of a conventional chair.

FIG. 8 is a schematic explanatory diagram of respective examples (a) and (b) of a backrest in a retracted state of a chair provided in a conventional retractable staircase-shaped bleaching seat.

[Explanation of symbols]

 1 Chair 2 Base 3 Seat 4, 26, 29 Backrest 5 Surface covering material 6 Frame 7 Lower end fixing frame 8 Intermediate fixing frame 9, 10, 11 Spring 12 Connecting material 13, 14, 15 Locking piece 16, 20, 25 , 28 Side frame 17 Upper end fixing cap 18 Fixing ring 19 Cushion material 21, 22 Rubber plate 23, 27 Connecting bar 30 Coil spring X Vertical load direction Y Vertical deflection

Claims (6)

[Claims] 1. A chair having a flat backrest composed of a frame in which parallel left and right side frames are connected by a lower fixed frame, and a flat backrest made up of a cushion material fitted to the frame. A chair characterized in that a plurality of steps of elastic material are installed between frames, and the load deflection of the elastic material is gradually increased upward from below the backrest. 2. The chair according to claim 1, wherein the elastic material is a corrugated spring in one plane, and the pitch of the spring is larger on the backrest upper side than on the backrest lower side. 3. The chair according to claim 1, wherein the elastic material is a corrugated spring in one plane, and the entire length of the spring is larger on the backrest than on the backrest. 4. The chair according to claim 1, wherein the elastic material is a corrugated spring in one plane, and the thickness of the spring is smaller on the back side than on the back side. 5. The chair according to any one of claims 2 to 4, characterized in that a connecting member is installed between the springs. 6. The chair according to claim 1, wherein the elastic material is a rubber plate.