JP2000287783A - Chair - Google Patents

Abstract

PROBLEM TO BE SOLVED: To support the buttocks or waist with pressure at the lower part of a backrest without damaging the continuity of the entire backrest and without forming a gap between the buttocks or waist and the lower part of the backrest at the time of backward reclining. SOLUTION: A backrest plate 14 to be attached to the front face of a backrest frame 10 is formed from an upper shell 14a and a lower shell 14b, the upper part of the upper shell 14a is attached to the upper part of the backrest frame 10, the intermediate part of the lower shell 14b is attached to the lower part of the backrest frame 10 so as to be rotated around a lateral pivot 20, and a stretchable and contractable bent part 14c is formed between the upper shell 14a and the lower shell 14b. Thus, when the intermediate part of the backrest plate 14 is pressed backward, the lower part of the upper shell 14a and the upper part of the lower shell 14b are moved back, the lower part of the lower shell 14b is turned forward and the buttocks or waist of a sitting person is supported with pressure.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a chair suitable for operation of OA equipment such as a personal computer, and capable of securing a stable posture during reclining.
In particular, the present invention relates to a chair capable of pressing and supporting the buttocks or waist during reclining.

[0002]

2. Description of the Related Art A mechanism for tilting or reclining a seat or a backrest in order to properly support a body in response to various postures and changes in a working posture in desk work using an OA device such as a personal computer. Chairs equipped with are known. In particular, as a device for preventing a gap from being formed between the waist or buttocks and the backrest at the time of the backward leaning posture and causing back pain, WO96 / 25WO
072 pamphlet (1996), the waist or buttocks and the shoulder (back) of the seated person can always be supported independently of each other, regardless of the inclination of the spine of the seated person or the sitting posture. Known chairs are known.

[0003]

In such a conventional chair, the hip (or buttocks) receiver and the shoulder (back) receiver are tilted independently by separate tilting mechanisms.
The continuity of fitting to the shoulder (back) and waist (buttock) was lost, and a sense of incongruity occurred. In addition, the tilting mechanism becomes complicated and the cost increases.

[0004] The present invention has been made in view of the above-mentioned problems of the prior art, and does not impair the continuity of the entire backrest and, when tilting backward, moves the hips or waist and the lower part of the backrest. It is an object of the present invention to provide a chair having a simple structure in which the lower back can press and support the buttocks or waist without leaving any gap between them.

[0005]

According to the present invention, the above-mentioned problem is solved as follows. (1) A backrest frame is erected at the rear of the seating portion, and a backrest plate attached to the front surface of the backrest frame is provided with an upper shell and a lower shell, and the upper shell of the upper shell is provided above the backrest frame. An upper part is attached, and an intermediate part of the lower shell is attached to a lower part of the backrest frame so as to be rotatable around a left-right pivot, and a bent portion capable of elastically bending between the upper shell and the lower shell is provided. When the middle portion of the backrest plate is pressed backward, the lower portion of the upper shell and the upper portion of the lower shell move rearward while the bent portion bends in a letter shape, and The lower portion rotates forward around the pivot to press and support the buttocks or waist of the seated person.

(2) In the above item (1), the lower shell is shaped like a side view with a middle portion protruding forward.

(3) In the above item (1) or (2), the upper end of the upper shell is attached to the upper end of the backrest frame so as to be rotatable around a left-right pivot.
The bent portion is formed of a stretchable material.

(4) In any one of the above items (1) to (3), the backrest frame is mounted on the seat portion so as to be tiltable rearward.

[0009]

Next, an embodiment of a chair according to the present invention will be described with reference to the accompanying drawings.

FIG. 1 is an exploded perspective view showing the structure of a backrest portion which is a main part of an embodiment of the chair of the present invention.
As shown in the drawing, the backrest portion of the present embodiment includes a backrest frame (10), a backrest plate (14), a back cushion material (16), and the like.

The backrest frame (10) is made of a pair of left and right metal or hard synthetic resin rods, and its lower horizontal rod (10a) extends forward and is not shown in this figure.
The tip is attached to a seat plate, and can be tilted rearward about a fulcrum near the support base (12). This structure is generally known as a back seat synchro reclining mechanism.

On the other hand, a pair of left and right upper vertical rods (10b)
The upper and lower portions are formed to be bent in a U-shape in opposite directions. That is, in the lower part, it is convex forward, and in the upper part,
It is bent backward and convex.

On the front surface of the upper end of the vertical rod portion (10b) and on the front surface of the lower bent portion, a horizontal bearing (18) having an open upper portion is formed so as to protrude forward.

The back plate (14) is, for example, a molded product of a hard synthetic resin material having elasticity, and is formed of an upper shell (14a).
And the lower shell (14
b), and the boundary between the upper shell (14a) and the lower shell (14b) is located at a position corresponding to the upper bent portion projecting rearward of the vertical rod portion (10b). This position corresponds to the boundary between the thoracic spine and the lumbar spine of the seated person.

The lower end of the upper shell (14a) and the lower shell (14a)
The upper end of b) is connected to each other by a bent portion (14c) which is formed in a corrugated shape in a side view so as to be able to expand and contract in the vertical direction and to be elastically flexible in the front and rear directions.

In this embodiment, the bent portion (14c)
Are shown integrally molded with the upper and lower shells (14a) (14b). However, in general, the bend (14c)
May be separate from the upper and lower shells (14a) (14b).

The upper shell and the lower shell of the upper shell (14a)
A pivot, that is, a horizontal axis (20) extending in the left-right direction is formed on the rear surface of the bent portion of (14b) so as to project rearward from both sides. The horizontal shaft (20) fits in the horizontal bearing (18) whose upper part of the above-mentioned vertical rod portion (10b) is open.

In the above embodiment, the upper shell (1
The attachment of the upper end of the vertical rod portion (10b) to the upper end of the vertical rod portion (10b) is exemplified as a pivot, but this attachment is performed by inserting the upper shell (14a) into the vertical slide groove formed at the upper end of the vertical rod portion (10b). ) Horizontal axis (2
0) may be slidably engaged.

In assembling, the horizontal shaft (2) of the upper and lower shells (14a) (14b) is attached to the upper and lower horizontal bearings (18) of the vertical rod (10b).
0) is dropped from above to hold it elastically. In this way, the backrest plate (14) is attached to the backrest frame (10), and then, on the front and back surfaces of the backrest plate (14),
The back cushion material (16) is attached by a predetermined means to form the back of the chair. 1 to 3, the illustration of the back cushioning material attached to the back surface of the backrest plate (14) is omitted.

Next, the operation of the present embodiment will be described with reference to FIGS.

As shown in FIG. 2, when the occupant is sitting in an upright sitting position, the backrest is pushed backward with his back,
When the entire backrest is tilted backward in the reclining posture shown by the solid line in FIG. 3, the backrest frame (10) is tilted rearward about the fulcrum near the support base (12) by a backward force acting on the backrest plate (14).

The rearward pressing force of the occupant's back acts on the lower part of the upper shell (14a) and the upper part of the lower shell (14b), respectively, and as shown by the solid line in FIG. 14c) is elastically deformed and expanded so that its waveform opens, and is slightly elastically bent so that the intersection angle of the upper and lower shells (14a) and (14b) becomes small, and as a result, the lower shell ( The upper part of 14b) is tilted further backwards with respect to the back frame (10), and the upper shell (14a) is tilted forward with respect to the back frame (10) and the lower shell (14b), but at an absolute level. In this case, the upper part of the backrest frame (10) and the lower shell (14b) is gently tilted backward at an angle smaller than that of the upper part.

At the same time as the upper half of the lower shell (14b) is tilted rearward, the lower shell (14b) pivots forward about the lower horizontal axis (20) and comes into contact with the seated person. To support the seated person's buttocks or waist.

According to the present invention, as described above, the lower portion of the upper shell (14a) and the upper portion of the lower shell (14b) pivot rearward in accordance with the seating posture of the occupant. Since the lower part of the lower shell (14b) protrudes forward and presses and supports the buttocks or the waist of the seated person inclined backward, for example,
When using OA equipment such as a personal computer, it is possible to easily take a relaxed posture in which the center of the back is tilted backward while raising the head forward and looking at the monitor screen. Close to the buttocks or waist, providing a comfortable fit.

The upper horizontal shaft (20) may be slidably fitted in a vertically oriented guide groove (not shown) formed in the upper end of the backrest frame (10). is there.

[0026]

According to the first aspect of the present invention, when the occupant takes a posture in which the back center is slightly tilted backward, the lower part of the upper shell and the upper part of the lower shell move rearward, and Accompanying this, the lower part of the lower shell rotates forward and presses and supports the seated person's buttocks or waist, so the backrest always fits from the seated person's back to the buttocks without impairing the continuity as a whole, A comfortable sitting feeling can be obtained. Moreover, the support of the buttocks or the waist can be realized with a very simple structure by using a special buttocks support and not tilting it by a troublesome special tilt mechanism.

According to the second aspect of the present invention, the lower portion of the backrest plate can be fitted in a shape extending from the lower back of the seated person to the hip through the waist.

According to the third aspect of the invention, the bent operation of the upper shell and the upper portion of the lower shell can be permitted by the expansion and contraction of the bent portion, and the supporting structure of the backrest plate is provided. It can be simplified.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an embodiment of the present invention in a state where a backrest is disassembled.

FIG. 2 is a side view of the embodiment in an upright sitting position.

FIG. 3 is also a side view in a rearwardly inclined sitting state.

[Explanation of symbols]

 (10) Backrest frame (10a) Horizontal rod (10b) Vertical rod (12) Support base (14) Backrest plate (14a) Upper shell (14b) Lower shell (14c) Bend (16) Back cushion material (18 ) Horizontal bearing (20) Horizontal axis (axis)

Claims (4)

[Claims] 1. A backrest frame is erected at a rear portion of a seating portion, and a backrest plate attached to a front surface of the backrest frame includes an upper shell and a lower shell, and the upper portion of the backrest frame includes the upper portion. An upper part of the shell is attached, and an intermediate part of the lower shell is attached to a lower part of the backrest frame so as to be rotatable around a left-right pivot, so that the upper shell and the lower shell can be elastically bent. The lower part of the upper shell and the upper part of the lower shell move rearward while the bent part is bent in a U-shape when the middle part of the backrest plate is pressed backward, and A chair, wherein a lower portion of a shell is rotated forward around the pivot to press and support the buttocks or waist of a seated person. 2. The chair according to claim 1, wherein the lower shell is shaped like a side view when the middle part projects forward. 3. The chair according to claim 1, wherein the upper end of the upper shell is attached to the upper end of the backrest frame so as to be rotatable around a pivot in the left-right direction, and the bent portion is formed of a stretchable material. 4. The chair according to claim 1, wherein the backrest frame is mounted on the seat so as to be tiltable backward.