JPH06327533A - Chair - Google Patents

Abstract

PURPOSE:To use simple and small structures for the exciting means of a seat and a backrest and comfortably tilt the seat and backrest at good balance on the right and left. CONSTITUTION:A gas spring 19 and a torsion coil spring 9 are used as means for exciting a seat 3 and a backrest 15 to the horizontal position and the vertical position respectively, thus the weakness of the excitation force by the gas spring 19 alone is supplemented by the torsion coil spring 9, and the excitation force applied to the back by the backrest 15 can be made adequate.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a chair which can be tilted more comfortably than ever before from a working position to a comfortable position and vice versa.

[0002]

2. Description of the Related Art Various conventional chairs in which a seat and a backrest are tilted in conjunction with each other are already provided, and a gas spring and various springs are usually used to orient the seat and the backrest to a horizontal position and a vertical position, respectively. I am biased.

[0003]

However, the one using the gas spring is convenient because the inclination of the seat and the backrest can be easily adjusted and fixed at an arbitrary angle by operating the lever. Since the biasing force is weak only with other, we often use other springs together,

For example, Japanese Patent Publication No. 62-57325 discloses a device that uses a gas spring and a compression coil spring together. However, since this device has the gas spring and the compression coil spring arranged in parallel to the left and right, There has been a problem that asymmetrical loads are generated in the respective parts of the chair, which promotes wear of the sliding parts and the pivot parts.

To solve this problem, Japanese Patent Publication No. 3-28
No. 202 gazette discloses that two compression coil springs are arranged in parallel on both sides of a gas spring arranged in the front-rear direction at the center of the seat in the left-right direction.
This device has a problem in that the structure is complicated and large in size, and also has a problem in that the backrest is prone to rattling due to its complicated structure, which causes discomfort to the seated person.

The present invention has been made in view of the above problems of the prior art. The structure of the biasing means for the seat and the backrest is simple and small, and the left and right sides are well balanced and comfortable. The purpose is to provide a chair in which the backrest can be tilted.

[0007]

In order to solve the above problems, a feature of the present invention is that a base frame is fixed to an upper end of a pedestal, and a seat mounting frame fixed to a lower surface of a seat is attached to a front portion of the base frame. The front part of
It is pivotally supported so that it can be tilted up and down, and the front and lower ends of the back support frame that supports the backrest are pivotally supported by the base frame or the seat mounting frame, and the backrest and the seat are linked so that the seat tilts up and down in conjunction with the backrest. In addition, the seat and the backrest are directed toward the horizontal position and the vertical position, respectively, and are biased by a torsion coil spring and a gas spring.

[0008]

[Operation] By using the gas spring and the torsion coil spring as the means for urging the seat and the backrest respectively in the horizontal position and the vertical position, the torsion coil spring does not block the weakness of the urging force of the gas spring alone. The urging force that the backrest gives to the back can be made appropriate.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The drawings show an embodiment of the present invention, in which a rectangular box-shaped base frame having an upper surface opening is formed at the upper end of a pedestal (1) of a chair.
(2) is stuck.

A seat mounting frame (4) having a seat (3) mounted on the upper surface of the base frame (2) is externally fitted to the base frame (2) with a sufficient margin from above, and both side plates (2a) of the base frame (2) are fitted. ) In the front-back long hole (5) formed in the front part of the seat mounting frame (4) on both sides of the upward support piece (6)
A pivot (7), which is erected in the left-right direction and is oriented in the left-right direction, is fitted so as to be movable back and forth.

Axis on both side plates (4a) of the seat mounting frame (4)
The torsion coil springs (9) are supported by a pair of left and right pivots (8) projecting slightly inward from (7), and one end of both torsion coil springs (9) is attached to the seat mounting frame (4). The other end is fitted into the locking hole (10) formed in the bottom surface, and the other end is in contact with the front surface of the locking projection (11) projecting on the outer surface of both side plates (2a) of the base frame (2). The seat mounting frame (4) is urged substantially forward and upward.

Both ends of the link (13) inclined forward and downward are provided on the rear lower part of both side plates (2a) of the base frame (2) and the upper rear part of both side plates (4a) of the seat mounting frame (4). Are pivotally attached to each other by pivots (12) pointing in the left-right direction, and a long hole (14) is formed in the middle part of the link (13) so as to be oriented substantially in the longitudinal direction of the link (13), that is, inclined forward and downward. Has been done.

At the rear upper portion of the base frame (2), a front end portion of a back support frame (17), which is fixed to the lower end of the back rod (16) of the backrest (15) and faces forward, is pivoted in the left-right direction. A shaft (18) which is pivotally supported by (17a) and which is provided on the outer surface of the intermediate portion of the back support frame (17) and which faces in the left-right direction is engaged with the elongated hole (14) of the link (13).

Both ends of a known gas spring (19) are pivotally attached to the lower rear portion of the base frame (2) and the upper rear portion of the back support frame (17).

The seat (3) of the chair having the above-mentioned structure is supported by the base frame (2) so as to be movable back and forth and tiltable within the range of the length of the elongated hole (5). It is located at the front end due to the bias of 9) and is almost horizontal due to the action of the link (13).

The backrest (15) is urged forward by the urging force of the gas spring (19), and when the seat is vacant, the shaft (18) abuts the rear upper end of the elongated hole (14) and becomes substantially vertical. Has become.

When the push button (19a) at the rear end of the gas spring (19) is pushed in, as shown in FIG. 3, when the backrest (15) is tilted backward, the back support frame (17) is placed on the backrest (15). )
And the back rod (16) and tilt backward together with it, and accordingly, the link (13) whose middle portion is connected to the back support frame (17) tilts rearward and downward, whereby the seat mounting frame (4 ) Is the front axis (7)
With the fulcrum as the fulcrum, it moves backward while tilting downward.

Therefore, as the backrest (15) tilts backward, the seat (3) rotates backward and downward while retracting.
You can comfortably shift to a comfortable posture by natural movement without turning up the shirt of the seated person's waist, lifting your knees and lifting your toes from the floor, or narrowing the bending angle of your knees. .

When the push button (19a) of the gas spring (19) is projected to its original position with the backrest (15) tilted backward by a desired angle, the backrest (15) and the seat (3) are separated from each other.
It is fixed in that position with some cushioning.

When the push button (19a) of the gas spring (19) is pushed from any state without applying a backward load to the backrest (15), the biasing force of the gas spring (19) itself and the torsion coil Due to the urging force of the spring (9), the backrest (15) is rotated about the pivot (17a) so as to stand upright to a vertical position, and the seat (3) is moved forward to a substantially horizontal position. The rear end is rotated while being lifted.

[0021]

According to the present invention, the following effects can be obtained. (a) Since the gas spring and the torsion coil spring are used as the means for urging the seat and the backrest respectively in the horizontal position and the vertical position, the torsion coil spring does not block the weakness of the urging force of only the gas spring. The urging force that the backrest gives to the back can be made appropriate.

(B) By using a gas spring as a means for urging the seat and the backrest respectively to the horizontal position and the vertical position, the push valve of the gas spring is opened / closed so that the seat and the backrest can be tilted. ,
It can be fixed at any angle.

(C) As in the chair according to the second aspect of the invention, the torsion coil springs are paired on the left and right, and the torsion coil springs are mounted between the both sides of the base frame and the seat mounting frame, thereby acting on the seat and the backrest. It is possible to improve the left-right balance of the urging force to be applied and to reduce the vertical thickness of the tilting device.

(D) As in the chair according to claim 3, by disposing the gas spring in the center of the chair in the left-right direction, the forces from the gas spring and the torsion coil spring act symmetrically on each part of the apparatus. Therefore, the uneven wear of the movable part is small, and the rattling of each part can be reduced.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional side view of a main part of a working posture of an embodiment of the present invention.

FIG. 2 is a plan view showing a seat and a backrest similarly removed.

FIG. 3 is a vertical cross-sectional side view of a main part in the same comfortable posture.

[Explanation of symbols]

(1) Pillar (2) Base frame (2a) Side plate (3) Seat (4) Seat mounting frame (4a) Side plate (5) Long hole (6) Upward supporting piece (7) Axis (8) Support shaft ( 9) Torsion coil spring (10) Locking hole (11) Protrusion (12) Axis (13) Link (14) Long hole (15) Backrest (16) Back rod (17) Back support frame (17a) Axis (18) Axis (19) Gas spring (19a) Push button

Claims (3)

[Claims] 1. A base frame fixed to an upper end of a pedestal, and a front part of the seat mounting frame fixed to a lower surface of the seat is pivotally supported on a front part of the base frame so as to be vertically tiltable, and the base frame or the seat is mounted. The front and lower ends of the back support frame that supports the backrest are pivotally supported by the frame, and the backrest and the seat are linked so that the seat tilts up and down in conjunction with the backrest,
The chair according to claim 1, wherein the seat and the backrest are respectively biased to a horizontal position and a vertical position by a torsion coil spring and a gas spring. 2. A chair characterized in that a pair of left and right torsion coil springs for urging the seat mounting frame toward a horizontal position are provided symmetrically between both sides of the base frame and the seat mounting frame. . 3. The chair according to claim 1, wherein both ends of the gas spring are pivotally supported between the center of the base frame in the left-right direction and the center of the back support frame in the left-right direction.