JPH10113244A - Chair - Google Patents

Abstract

(57) [Summary] [Problem] A lot of parts are required for a locking mechanism.
In addition, there is a disadvantage that if the device is made compact to suppress bulkiness, it cannot withstand a large load. A leg 1, a back 2 whose base end 21a is supported by the leg 1 so as to be able to tilt backward, and a torsion bar 3 disposed at a position where the repulsive force is accumulated by the backward tilting operation of the spine 2. A seat 4 that is supported around a pivot point n with its front end 4a set to the leg 1 and whose rear end 4b is connected to the back 2 via a link member 5; The seat 4 is configured to be able to rotate rearward and downward around the pivot point n.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a chair having a locking function.

[0002]

2. Description of the Related Art In general, a chair having a locking function has a locking mechanism as one independent completed product, and the locking mechanism is attached to a leg to support a seat or a backrest. It is customary to do so.

[0003]

However, such a conventional locking mechanism is provided in a limited space between a leg and a seat or a back, so that the locking mechanism is made as compact as possible to suppress bulkiness. Many components are used and built in so as to perform an independent locking function by itself. Therefore, not only is it difficult to reduce the number of steps and cost, but also there is a problem that there are many restrictions in providing an appropriate locking function because individual components are small and a large load cannot be applied.

[0004]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, an object of the present invention is to eliminate useless parts and restrictions on assembly by configuring the whole chair to perform a locking function. I have.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A chair according to the present invention has a leg, a back whose base is supported by the leg so as to be capable of tilting backward, and a position where a repulsive force is accumulated by the tilting operation of the back. And a seat whose front end is rotatably supported around a pivot point set on the leg and whose rear end is swingably supported by the back via a link member. The seat is configured to be able to rotate rearward and downward around the pivot point with the backward tilting operation of the back.

In the chair having such a configuration, when the user sits on the seat and leans on the back, the back tilts backward against the elastic body according to the load. Along with this, a seat pivotally supported at the front end by the leg and supported at the back by the rear induces a turning operation rearward and downward about the pivot point. As a result, the whole chair is in a state where the occupant takes a comfortable posture. on the other hand,
When the occupant removes the load on the back, the elastic body emits a repulsive force, which urges the back to rotate forward, and conversely, the seat moves forward around the pivot point. The pivoting action is caused to move upward, and the entire chair is brought into a state in which the seated person takes a normal posture.

As described above, the chair of the present invention can exert a locking function on the whole chair by the legs, the back urged by the elastic body, the seat, and the link member. For this reason, compared with the case of forming an independent locking mechanism, there is no need to bring unnecessarily many parts into a limited space, and the strength of the components of the chair can be used as it is as the strength of the locking mechanism. In addition, the strength against load can be increased without difficulty.

In a preferred embodiment, the elastic body is:
A torsion bar having a part fixed to the leg and having a lower end of the back rigidly connected to a portion of the torsion bar deviated from the fixed position. With this configuration, a large elastic force can be easily set, and the degree of freedom in designing the locking function can be effectively increased.

[0009]

An embodiment of the present invention will be described below with reference to the drawings. This chair includes a leg 1, a back 2, a torsion bar 3, which is an elastic body, and a seat 4. The leg 1 is made of a pipe frame and has a caster 11b at the lower end 11a.
And a pair of left and right front leg elements 1 having upper ends 11c extending linearly upward and rearward and rigidly connected to lower surfaces of both ends of the horizontal member 12.
1, a caster 13b is attached to the lower end 13a and the upper end 13
c is curved forward and upward, and a pair of left and right rear leg elements 13 are formed by rigidly connecting the upper end portion near the both ends of the horizontal member 12 to the upper surface near the both ends. , By the rear leg element 13 and the horizontal member 12. Then, the upper end 13c of the rear leg element 13
, A horizontal support shaft 14 is traversed at both ends, and the horizontal support shaft 14
Is set as the pivot point n of the present invention. Also,
The torsion bar 3 is inserted in the hollow portion of the horizontal member 12. The torsion bar 3 has a central portion 3a fixed to the transverse member 12 by welding or the like, and both end portions 3b deviated from the central portion 3a are arranged at positions substantially matching the both end portions of the transverse member 12. The end portions 3b are capable of storing elastic force while being twisted with respect to the central portion 3a.

The back 2 is supported by the leg 1 so as to be capable of tilting backward.
Left and right dorsal support rods 21 penetrating through notches 12a provided at both ends of the torsion bar 3 and rigidly connected to both ends 3b of the internal torsion bar 3 and having upper ends 21b extending substantially on the extension line of the front leg element 11. And a back plate 22 supported between the upper ends 21b of the back support rods 21. The back 2 twists the torsion bar 3 while the torsion bar 3
Can perform a backward tilting operation around the axis m.
The backing plate 22 has an upholstery material 22x detachably attached thereto. The upholstery material 22x has a configuration in which the periphery of a breathable core material is wrapped in a net-shaped outer fabric by three-dimensional knitting, and is disposed at a position covering at least the front side of the back plate 22, While acting as a cushion, allowing air to flow in the direction perpendicular to the thickness direction,
It can provide a comfortable feeling of use.

The seat 4 includes a seat support 41 made of a pipe frame,
A seat body 42 is attached to and supported by the seat receiver 41.
The seat receiver 41 has a shaft insertion hole 4 at a position to be the front end 4a of the seat 4.
3a, the bracket 43 having the bracket 4 is attached.
3 by inserting the end of the horizontal support shaft 14 into the shaft insertion hole 43a so that the front opening edge of the shaft insertion hole 43a is pivotally supported at the pivot point n of the horizontal support shaft 14 during the locking operation. A portion 41a and a seat frame 41b rigidly connected to the flat plate portion 41a are provided. Also, the rear end 4 of the seat 4
The rear portion of the seat receiving frame portion 41b serving as b is pivotally connected to the front edge of the plate-like link member 5 via the pin 51, and the rear edge of the link member 5 is pivotally connected to the lower edge of the back plate 22 via the pin 52. By tying, the rear portion of the seat receiver 41 is swingably supported by the back plate 22. The seat body 42 is also detachably attached to the seat body 42 at a position where at least the upper surface of the upper member 42x having the same configuration as the upper member 22x of the back plate 22 is covered.

When no load is applied to the back 2, the back support rod 21 is connected to the front leg element 11 as shown by a solid line in FIG.
The back 22 is located on the extension of
At this time, the back 2 is connected to the rear end 4 b of the seat 4 via the link member 5.
Is set so as to be held at substantially the same height position as the front end portion 4a of the seat 4, and a load is applied to the back 2 from this position to move the back support rod 21 around the axis m by an imaginary line in FIG. When the back 2 is tilted rearward as described above, the back 2 is moved rearward and downward, and accordingly, the back 2 changes the supporting position of the rear end 4b of the seat 4 via the link member 5 to a lower position. As a result, the seat 4 is set so that it can be rotated rearward and downward around the pivot point n.

In this chair, the front leg element 11 is wider in the width direction than the rear leg element 13, and the left and right front legs of another chair are provided outside the left and right rear leg elements 13 of this chair. By bringing the further chair closer from the rear with the element 11 in position, the chairs can be stacked horizontally closely together. That is,
During this stacking operation, the lower surface of the seat 4 of the front chair is pushed up by the front edge of the seat 4 of the rear chair, and the link member 5 rotates forward with the pin 52 as a fulcrum.
Is designed to lift the rear portion 4b of the seat 4 upward and retract it to a position where the seat 4 assumes a forwardly inclined posture. The shaft insertion hole 43a of the bracket 43 provided at the front end 4a of the seat 4 is relatively widened rearward from the front opening edge pivotally supported at the pivot point n of the horizontal support shaft 14. This is to allow the horizontal support shaft 14 to move freely when the seat 4 is retracted.

When the user sits on the seat 4 of the present embodiment and leans against the back 2, the back 2 moves around the axis m of the torsion bar 3 according to the load. It tilts backward while twisting both ends 3b. Along with this, the seat 4 whose front end 4a is pivotally supported by the leg 1 and whose rear end 4b is supported by the back 2 causes a pivoting operation rearward and downward about the pivot point n. As a result, the whole chair is in a state where the occupant takes a comfortable posture. On the other hand, when the occupant removes the load applied to the back 2, the torsion bar 3 emits a repulsive force, which urges the back 2 to rotate forward. A rotation operation is caused to move forward and upward around the pivot point n, and the entire chair is brought into a state in which the occupant assumes a normal posture.

As described above, the chair according to the present embodiment comprises a leg 1, a back 2 urged by a torsion bar 3, and a seat 4
And the link member 5, the whole chair can exhibit a locking function. Therefore, compared to the case where an independent locking mechanism is configured, it is not necessary to bring unnecessarily many parts into a limited space, and the strength of the components of the chair is used as it is as the strength of the locking mechanism. As a result, it becomes easy to provide an appropriate locking function, and at the same time, it is possible to easily increase the strength with respect to the load and effectively improve the reliability and durability.

In particular, in this embodiment, since the torsion bar 3 is employed as the elastic body, a large elastic force can be easily set, and the degree of freedom in designing the locking function can be effectively increased. . The specific configuration of each part is not limited to those in the illustrated embodiment, and various modifications can be made without departing from the spirit of the present invention.

[0017]

The present invention is embodied in the form described above and has the following effects. That is, the chair of the present invention is configured so that the entire chair can exhibit a locking function by the legs, the back urged by the elastic body, the seat, and the link member. As a result, the number of parts, the number of manufacturing steps, and the cost can be reduced more effectively than in the past, and the strength of the components of the chair can be used as it is as the strength of the locking mechanism. The durability and durability can also be increased without difficulty.

Further, by employing a torsion bar as the elastic body, a large elastic force can be easily set, and the degree of freedom in designing the locking function can be effectively increased.

[Brief description of the drawings]

FIG. 1 is a perspective view showing one embodiment of the present invention.

FIG. 2 is an exploded perspective view of FIG.

FIG. 3 is a side view of the embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Leg 2 ... Back 3 ... Elastic body (torsion bar) 4 ... Seat 4a ... Front end 4b ... Rear end 5 ... Link member 21a ... Base end n ... Pivot point

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Nobuyuki Ueda KOKUYO Co., Ltd. 6-1, 1-1 Ominato-minami, Higashinari-ku, Osaka-shi (72) Inventor Nobuhisa Kubota 5331 Nishiharu Kinoshitagawara, Ina-shi, Nagano Takano Inside Furniture Development Dept. (72) Inventor Yoshikazu Tanaka 5331 Nishiharu Kinoshita Kawahara Ina City, Nagano Prefecture Inside Takano Corporation Furniture Development Dept. (72) Inventor Sakuji Ito 5331 Nishiharu Kinoshita Kawahara Ina City, Nagano Prefecture Takano Co., Ltd.

Claims (2)

[Claims] 1. A leg, a back whose base end is supported by the leg so as to be able to tilt backward, an elastic body arranged at a position for accumulating a repulsive force by the backward tilting operation of the back, and a front end portion, A seat rotatably supported about a pivot point set on the leg and a rear end swingably supported by the back via a link member, with a back tilting operation of the back A chair, characterized in that the seat can be pivoted rearward and downward about the pivot point. 2. An elastic body is a torsion bar provided with a part thereof fixed to a leg, and a lower end of a back is rigidly connected to a portion of the torsion bar deviated from the fixed position. The chair according to claim 1, characterized in that: