JP2000135139A - Chair - Google Patents

Abstract

PROBLEM TO BE SOLVED: To satisfactorily adjust the reclining of a seat part while reinforcing a leg body without adding any new member by connecting the lower terminal parts of rear leg elements of a chair having four legs with a connecting member, and supporting the lower end part of a gas spring for inclining the rear end of the seat part on this connecting member. SOLUTION: Lower end parts 12a of rear leg elements 12 in left and right leg frames 10 are connected to each other with a rear connecting member 6, and the lower end of a gas spring 8 for regulating the inclination of a seat part 2 and a backrest 3 is supported on this rear connecting member 6. Namely, the rear connecting member 6 is formed from a round steel pipe or the like, and a lower end part 8b of the gas spring 8 is supported at a top end part 9b of a supporting bracket 9 fixed at the central part of this connecting member. Thus, the gas spring 8 can be appropriately supported without adding any new member and without damaging the strength of a leg body 1, the stroke of the gas spring 8 can be kept much longer and the side of the rear end 2b of the seat part 2 can be stably inclined.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a four-legged chair capable of suitably adjusting a tilt angle of a seat.

[0002]

2. Description of the Related Art Conventionally, there is a chair configured to tilt a rear end side of a seat. As a preferable specific example, a gas spring is provided in the lower leg space on the rear end side of the seat, and the gas spring regulates the tilt of the rear end of the seat. With such a configuration, it is possible to tilt the seat while stably supporting the rear end thereof, and furthermore, it is possible to arbitrarily adjust the tilting position of the seat by using a gas spring and to obtain a cushioning effect. There are advantages. However, most chairs adopting this configuration are single-posted chairs in which the chair body is supported by a single support. Specifically, the lower end of the gas spring is used as a support and the upper end is used as a support. The part is supported on the lower surface of the rear end of the seat.

[0003]

On the other hand, there is a four-legged chair in which the chair body is supported by left, right, front and rear leg elements, in addition to the above-described single-posted chair. Such a four-legged chair is widely used because it has an advantage that a lower limb space can be widened as compared with a chair having a single pillar and a plurality of leg blades. There is also a demand for the chair with four legs to adopt the above-described configuration and to tilt the rear end side of the seat. However, in the current state, there is no suitable member for supporting the lower end of the gas spring, and if a support member is newly provided in the lower limb space of the seat, the number of parts increases, the appearance is impaired, and the lower limb space is narrowed. It is considered that such troubles as occur.

[0004]

In order to solve such a problem, a chair according to the present invention comprises a four-legged chair in which the vicinity of the lower end of a rear leg element is connected by a connecting member, and the connecting member is connected to the connecting member. The lower end of the gas spring that supports the rear end of the seat in a tiltable manner is supported.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS That is, the present invention relates to a leg body comprising at least a chair body having at least a seat and a backrest, and four leg elements supporting the chair body in front, back, left and right. The chair comprises: a front end side of the seat is pivotally attached to the leg body so as to be tiltable, and the vicinity of the lower ends of the left and right rear leg elements is connected by a connecting member; A gas spring capable of restricting the vertical movement of the rear end side of the seat is interposed between the ends.

With such a configuration, the connecting member for connecting the rear leg element is located only near the lower end without adding a new member, and the strength of the connecting member is maintained without deteriorating the strength of the leg. The member can be a supporting member that suitably supports the lower end of the gas spring, and the gas spring can have a longer stroke. In addition, the direction of the load applied to the seat and the direction of disposition of the gas spring are opposed to each other, so that the rear end of the seat can be tilted while being stably supported. In addition, by adopting the gas spring, the tilting position of the seat can be easily adjusted arbitrarily, and a cushioning effect can be obtained at the time of sitting. Further, by disposing the connecting member near the lower end of the rear leg element, the vicinity of the upper end of the rear leg element is opened, so that the vicinity of the rear end of the seat can be interfered even when leaning backward. Absent. Also, since the front end side of the seat is pivotally attached to the seat, even if the seat is tilted, the height position on the front end side hardly changes, thereby effectively preventing the user's legs from floating.

In order to increase the strength of the leg with a simple structure and to realize a simple and beautiful appearance, the leg is constituted by left and right leg frames integrally formed by connecting the front and rear leg elements by connecting elements. It is desirable to have been. In order for the user to be able to take a stable sitting posture by sitting deeply on the seat, it is desirable that the seat is disposed with the rear end side inclined downward at the upward movement position.

In order to obtain a good sitting posture with the back muscles stretched and to expect the effect of acupressure, it is desirable that the backrest is disposed with the upper end side inclined forward in the upward movement position of the seat. As a preferred embodiment of the seat and the backrest, there can be cited one in which the seat and the backrest can be tilted together while maintaining a fixed angle.

In order to make the stroke of the gas spring longer, it is desirable to support the lower end of the gas spring at the tip of the bracket hanging down from the connecting member. In a preferred embodiment of the chair, the connecting element of the leg frame is tilted rearward, and a position where the rearward tilting angle of the connecting element substantially coincides with the rearward tilting angle of the seat is a proper position of the seat. Can be mentioned.

[0010]

An embodiment of the present invention will be described below with reference to the drawings. 2 to 4 are views showing the chair A in a proper position P in which the rearward tilt angle of the seat 2 is substantially equal to the rearward tilt angle of the leg frame 10. This chair A is shown in FIGS.
As shown in FIG. 1, a chair main body 4 having a seat 2 and a backrest 3 and a leg 1 supporting the chair main body 4 in front, rear, left and right directions are provided.

The leg 1 is constituted by a pair of left and right leg frames 10. The leg frame 10 is formed by bending a single round steel pipe in an inverted U-shape. The front end disposed substantially vertically to the floor surface has a front end element 11 and a rear end. The rear leg element 12 has a rear end 13b between the upper ends of the front leg element 11 and the rear leg element 12.
It is connected by a connecting element 13 inclined downward with respect to 3a. Then, the upper end portions 11 of the left and right front leg elements 11
The vicinity of a is connected by the front connection member 7, and the vicinity of the lower end 12 a of the rear leg element 12 is connected by the rear connection member 6. Further, a pair of shafts p project inward from the vicinity of the front ends 13a of the left and right connecting elements 13, and the front end 2a side of the seat 2 is pivotally attached to the shafts p.

The seat 2 includes a seat body 21 formed by enclosing a cushion material such as urethane with a cloth material, a seat plate 22 attached to a lower surface of the seat body 21, and a seat plate. 2
And a seat receiving member 23 supporting the lower surface of the second member. The seat receiving member 23 includes left and right rod portions 231 disposed on the left and right.
And a front rod portion 232 connecting the front ends 231a of the left and right rod portions 231 is formed by bending a single round steel pipe into a substantially U-shape, and furthermore, a rear end 231 of the left and right rod portions 231.
The vicinity of b is connected by welding a round steel pipe or the like to form a rear connection rod portion 233. And the left and right rod portions 23
A portion near the front end 231a is pivotably attached to the left and right leg frames 10 via the axis p. Left and right sticks 231
Is the upper position where the rear end 231b is disposed at the highest position,
Since the seat 2 is disposed to be inclined downward gradually from the front end 231a to the rear end 231b, the seat 2 is in the upward movement position and the rear end 2
This means that the b-side is inclined downward with respect to the front end 2a. FIGS. 2 to 4 show a state where the seat 2 is at a position where the rearward tilt angle is substantially equal to the rearward tilt angle of the connecting element 13 of the leg frame 10. Is used as the optimum position P, which is the most optimal angular position. The upward movement position is
Although not shown, it is a position rotated several degrees upward from the appropriate position P. And the rear end 2 of the left and right rod portions 231
The back support rod 5 that supports the backrest 3 by standing up vertically 31b.

The back support rod 5 is formed of a round steel pipe continuous with the left and right rod portions 231 of the seat receiving member 23, and the upper half 5a is crushed to form a flat portion 51.
1 has a backrest 3 attached. The backrest 3 is a back plate 3 fastened to the front surface of the flat portion 51 of the back support rod 5 with bolts or the like.
1 and a backrest body 32 attached to the front surface of the backboard 31. Since the back support rod 5 supporting the backrest 3 is formed integrally with the seat receiving member 23, the backrest 3 can be tilted integrally with the seat 2 while maintaining a constant angle. ing. Furthermore, since the upper end of the back support rod 5 is inclined forward with respect to the lower end at the upward movement position of the seat 2, the upper end 3a of the backrest 3 is also inclined forward at the upward movement position of the seat 2. Further, the backrest body 32 is formed by enclosing a cushion material such as urethane with a cloth material, and the thickness of the central portion is slightly thinner than the left and right sides.

In the chair A having such a configuration, in the present embodiment, the vicinity of the lower ends 12a of the rear leg elements 12 of the left and right leg frames 10 is connected by the rear connecting member 6, and the seat 2 and the rear connecting member 6 are connected to the rear connecting member 6. The lower end of the gas spring 8 that can restrict the tilt of the backrest 3 is supported. The rear connecting member 6 is formed of a round steel pipe fixed at both ends by welding between the rear leg elements 12, and integrally fixed by welding the support bracket 9 at an intermediate position in the left-right direction. Has been established.

The support bracket 9 is formed by a pair of left and right wall portions 91 having a shaft insertion hole 91a.
a is fixed to the rear connecting member 6, and a distal end 9 b hangs obliquely downward and forward from the base end 9 a, and the distal end 9 b supports a lower end 8 b of the gas spring 8.
The gas spring 8 includes an operating end 8 provided near the upper end 8a.
A valve (not shown) opens and closes and can expand and contract only when the operation lever 84 is pressed by the operation lever 84. The lower end 8 b of the gas spring 8 has a shaft insertion hole 85.
a, and a shaft q inserted through the shaft insertion hole 91a of the support bracket 9 is inserted into the shaft insertion hole 85a, thereby the gas spring 8
Is pivotally attached to the rear connecting member 6. Also,
Bracket 86 also having shaft insertion hole 86a at upper end 8a
The shaft r is inserted through the shaft insertion hole 86a and the shaft insertion hole 234a provided in the bracket 234 which is suspended obliquely downward and forward from the rear connecting rod portion 233 of the seat receiving member 2. 8 is pivotally attached to the rear connecting rod 233.

In the chair A having such a configuration, when it is desired to adjust the tilt of the seat 2 and the backrest 3, the operation lever 8
4 is operated to press the operating end 83 so that the gas spring 8 expands and contracts. In that state, the user
When the load applied to is increased or decreased, as shown by the imaginary line in FIG. 5, the seat 2 and the backrest 3 tilt together while maintaining a certain angle.

With such a structure, the leg 1 can be formed by simply setting the position of the rear connecting member 6 for connecting the rear leg element 12 near the lower end portion 12a without adding a new member.
The connecting member 6 is connected to the gas spring 8 without impairing the strength of the gas spring 8.
Can be used as a supporting member for suitably supporting the lower end 8b of the gas spring 8, and the stroke of the gas spring 8 can be made longer. In addition, the direction of the load applied to the seat 2 and the disposition direction of the gas spring 8 are opposed to each other, and the seat 2 can be tilted while the rear end 2b side thereof is stably supported. In addition, the seat 2 can be easily mounted by using the gas spring 8.
The tilting position can be adjusted arbitrarily, and a cushioning effect can be obtained when sitting. Further, the space between the vicinity of the upper end portion of the rear leg element 12 is opened, so that the vicinity of the rear end 2b of the seat 2 is not interfered by the leg 1 even when the seat 2 tilts backward. Further, since the front end 2a of the seat 2 is pivotally mounted, the height position of the front end 2a hardly changes even if the seat 2 is tilted backward, so that the leg of the user is effectively prevented from floating. Can be.

Further, in the chair A, the seat 2 is disposed with the rear end 2b side inclined downward at the upward movement position, so that the user sits down on the seat 2 in a stable state. be able to. Furthermore, since the backrest 3 is disposed with the upper end 3a side inclined forward in the upward movement position of the seat 2, when the user sits down, as shown in FIG. The user's waist and back are pressed, and the back muscles naturally extend to improve the posture, and the effect of acupressure can also be expected. In particular, in the present embodiment, since the thickness of the central portion of the backrest body 32 is slightly thinner on the left and right sides, the back plate 31 can appropriately press the lumbar spine, the spine, etc. of the user through the cushion material. Therefore, a better acupressure effect can be expected.

Further, in this embodiment, since the seat receiving member 23 and the back support rod 5 are integrally formed by one round steel pipe, the seat 2 and the backrest 3 are integrated while maintaining a fixed angle. The seat 2 and the backrest 3 can be linked to each other, and the seat 2 and the backrest 3 can be tilted without causing displacement of the body in a state of being fitted to the body.

The lower end 8 of the gas spring 8 is attached to the tip 9b of the support bracket 9 which is suspended from the rear connecting member 6.
Since b is supported, the stroke of the gas spring 8 can be further lengthened and the tilt adjustment range can be expanded. The connection element 13 of the leg frame 10 is tilted rearward, and the position where the rearward tilt angle of the connection element 13 substantially matches the rearward tilt angle of the seat 2 is the proper position P of the seat 2, so that the appearance is good. In addition, the position of the seat 2 can be easily adjusted to the appropriate position P.

The specific configuration of each part is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the present invention.

[0022]

The present invention is embodied in the form described above and has the following effects. That is, in the four-legged chair, the vicinity of the lower end of the rear leg element is connected by a connecting member in the four-legged chair, and the connecting member supports the lower end of the gas spring that makes the rear end of the seat tiltable. Accordingly, the lower end of the gas spring can be suitably supported by the connecting member while reinforcing the leg without adding a new member, and the seat can be properly tilted backward. In addition, according to the configuration of the present invention, the stroke of the gas spring can be long, and the seat can be tilted while supporting the rear end side stably.
Further, by adopting a gas spring, the tilting position of the seat can be easily adjusted arbitrarily, and a cushion effect can be obtained at the time of sitting. Further, even when the seat is tilted backward, the vicinity of the rear end of the seat is not interfered by the legs, and the legs of the user are prevented from floating, so that the user can sit down with a sense of security. It becomes possible to tilt.

If the leg is constituted by left and right leg frames integrally formed by connecting the front and rear leg elements by connecting elements, the strength of the leg is enhanced by a simple structure, and the simple beautiful appearance is provided. Can be realized. If the seat is arranged with the rear end inclined downward at the up position,
The user can take a stable sitting posture by sitting deeply on the seat.

[0024] If the backrest is disposed with the upper end side inclined forward in the upward movement position of the seat, when the user sits down, the backrest will push the waist and the vicinity of the back of the user. You can take a good posture with your back muscles naturally stretched, and you can expect the effect of acupressure. If the seat and the backrest can be tilted together while maintaining a certain angle, the seat and the backrest can be tilted without causing a displacement of the body with the seat and the backrest fitted to the body. It becomes possible.

If the lower end of the gas spring is supported by the tip of the bracket hanging down from the connecting member,
The stroke of the gas spring can be made longer to extend the adjustment range of the tilt. The connecting element of the leg frame is tilted rearward, and if the position where the rearward tilting angle of the connecting element and the rearward tilting angle of the seat are substantially the same is the proper position of the seat, the appearance becomes good, It is easy to adjust the seat to the appropriate position.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a chair according to an embodiment of the present invention.

FIG. 2 is a front view of the embodiment.

FIG. 3 is a plan view of the embodiment.

FIG. 4 is a side view of the embodiment.

FIG. 5 is an operation explanatory view in the embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Leg 10 ... Leg frame 11 ... Front leg element 12 ... Rear leg element 12a ... Lower end part 2 ... Seat 2a ... Front end 2b ... Rear end 3 ... Backrest 3a ... Upper end 4 ... Chair body 6 ... Connecting member (rear connecting member) 8 gas spring 8b lower end 9 bracket (support bracket) 9a tip A A chair P appropriate position

Continued on the front page (72) Inventor Shinji Fukuhara 2-2-4 Tatsumihigashi, Ikuno-ku, Osaka F-term (reference) 3B099 AA01 BA09 CA35 CB05 CB06 DA04

Claims (7)

[Claims] 1. A chair comprising: a chair body having at least a seat and a backrest; and a leg body comprising four leg elements supporting the chair body in front, back, left and right. Attached to the legs so that the front end of the seat can be tilted,
The vicinity of the lower ends of the left and right rear leg elements is connected by a connecting member, and a gas spring capable of regulating vertical movement of the rear end of the seat is interposed between the connecting member and the rear end of the seat. And chair. 2. The chair according to claim 1, wherein the legs are constituted by left and right leg frames integrally formed by connecting front and rear leg elements by connecting elements. 3. The chair according to claim 1, wherein the seat is disposed with the rear end inclined downward at the upward movement position. 4. The chair according to claim 1, wherein the backrest is disposed so that the upper end thereof is inclined forward at the upper position of the seat. 5. The chair according to claim 1, wherein the seat and the backrest can be integrally tilted while maintaining a fixed angle. 6. The chair according to claim 1, wherein a lower end of the gas spring is supported at a tip end of a bracket hanging down from the connecting member. 7. The seat according to claim 1, wherein the connecting element of the leg frame is tilted rearward, and a position where the rearward tilting angle of the connecting element substantially coincides with the rearward tilting angle of the seat is a proper position of the seat. Item 7. The chair according to item 3, 4, 5, or 6.