JPH0755959Y2 - Tilt control device in chair - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a tilting control device for a chair for office work or the like, in which a backrest can be tilted backward against the elasticity of spring means.

[0002]

2. Description of the Related Art Sit on a seat in a chair for office work,
Various chair tilting devices have been devised in which the seat or the seat and the support of the backrest are configured to be tiltable rearward against the elastic deformation force of at least one spring body.

[0003]

However, conventionally, a spring body, such as a coil spring, whose spring constant (hardness) does not change is used as a spring body for elastically supporting the rearward tilting of the backrest, In other words, since the back of the backrest was supported by the spring body with a constant spring constant, when the person sitting on the chair leans against the backrest, the angle at which the backrest tilts backward is the same as that of a person with a light weight. In this case, it changes such that it is small in the case and large in the case of a heavy person, and there is a problem that one chair cannot give the same sitting comfort to people of different weight. It was

In order to solve this problem, US Pat. No. 407
In the specification of 7596, a spring body that elastically supports the rearward tilting of the seat body is configured as a leaf spring, and the base end of the leaf spring is fixed to a fixed frame body attached to the upper end of the leg of the chair, The free end of the leaf spring is extended in the rearward direction of the chair, and the seat body is provided with a pressing body that is movable in the front-rear direction. It is proposed that the degree of elastic deformation in the upward bow shape can be manually changed in advance and the elastic deformation resistance force (spring constant) of the leaf spring due to the rearward tilting of the seat body is adjusted.

However, in this prior art, the spring constant of the leaf spring must be manually adjusted one by one according to the weight of the person who sits on the chair, and the leaf spring is adjusted according to the weight of the person. If the constant is set to be small, even if the backrest leans back at an appropriate angle when a light weight person leans back, the backrest tilts excessively backward when a heavy weight person leans back. To do. On the other hand, if you set the spring constant to increase according to the weight of the person,
If a person with a heavy weight leans back, the backrest leans backward at an appropriate angle, but if a person with a light weight leans back, the backrest leans backward only a small angle. There has been a problem that the back tilt angle of the backrest cannot be automatically adjusted to be substantially constant regardless of the weight of the person sitting in the chair. An object of the present invention is to provide a tilt control device that solves this problem.

[0006]

In order to achieve this object, the present invention is to attach a seat body to a support mechanism provided on an upper part of a leg body so as to be capable of tilting backward or descending, and to the support mechanism or the seat body. In a chair in which a tilting motion body that bears a backrest load is mounted so that it can be tilted rearward and cannot be tilted forward, elastically supports both the rearward tilting or lowering motion of the seat body and the rearward tilting of the tilting motion body. The spring means is provided so as to be rotatable,
The weight acting on the seat body acts on the spring means, and the load acting on the spring means acts on the spring means from the tilting motion body by the backrest load. In such a manner that the spring means is urged in the direction of turning and the spring means is urged in the direction of turning in the other direction by the load of the backrest, the spring means are brought into contact with each other on opposite sides of the turning axis. .

[0007]

[Operation / Effect] With this configuration, when a person sits in the chair,
The spring means is urged to rotate in one direction via the load acting portion from the seat body, and the urging force abuts on the side opposite to the load acting portion with the rotation axis of the spring means interposed therebetween. Thus, the tilting motion body is urged in the forward tilting direction via the load acting portion. However, since the tilting motion body cannot be tilted forward, the spring means is prevented from rotating in one direction, in other words, the tilting motion body functions as a stopper that prevents the spring means from rotating. The means will be elastically deformed by the weight of the seat. That is, the spring means is automatically given in advance an initial setting such that the initial elastic deformation strain increases as the weight increases.

When the person sitting on the chair leans back and leans against the backrest, the tilting motion body tilts backwards against the elastic deformation force of the spring means. Since the reaction force for urging the spring means in the forward tilting direction is applied in advance in a size substantially proportional to the size of the body weight, when a person leans against the backrest, the spring means causes the tilting motion body to move. The back tilting of the backrest starts only when a force larger than the reaction force applied to the backrest acts in the opposite direction. Therefore, if the weight of the person sitting on the chair is heavy,
Since the reaction force against the backrest also becomes large, the backrest cannot be tilted backward unless a large force is applied to the backrest.On the other hand, when the weight of the person sitting on the chair is light, the reaction force against the backrest also becomes small, so it is small. The force will allow the backrest to tilt backwards. That is, the spring means are automatically adjusted to act as a hard spring for heavier persons and a softer spring for heavier persons against the back tilting of the backrest, and then sit on the chair. Even if a person's weight is different,
This means that the backrest can be tilted backward by approximately the same angle.

Therefore, according to the present invention, the backrest can be automatically tilted backward by substantially the same angle even if the weight of the person sitting on the chair is different, so that it is suitable for persons of different weight. There is an effect that it is possible to automatically give a sitting comfort.

[0010]

Embodiments of the present invention will now be described with reference to the drawings. First, FIGS. 1 to 5 show a first embodiment, and in these drawings, reference numeral 1 indicates a leg of a chair,
Reference numeral 2 indicates a fixed frame body as an example of a support mechanism provided on the upper end of the leg body 1, and the fixed frame body 2 is formed in a U shape facing upward in a front cross section. Reference numeral 3 indicates a seat body provided with a cushion body 5 on the upper surface of the seat plate 4, and a seat receiver 6 having a downward U-shaped cross section is fixed to the lower surface of the seat plate 4, and The front end portions of the left and right side plates 6a are attached to the first support shaft 7 with respect to the front end portions of the left and right side plates 2a of the fixed frame 2.
The seat body 3 is configured to be tiltable rearward about the first support shaft 7 by being pivotally mounted at. Reference numeral 8 denotes a tilting moving body for attaching the backrest 9, which tilting moving body 8 is formed in a U-shape with a normal cross section, and the left and right side plates 8a thereof are the left and right side plates of the fixed frame body 2. The tilting motion body 8 is configured to be tiltable rearward together with the backrest 9 by being pivotally attached to the 2a via the second support shaft 10, while the left and right side plates 8a in the front-rear midway portion of the tilting motion body 8 are arranged.
By connecting a wire 11 as an example of a stopper means between the fixed frame body 2 and the fixed frame body 2, the tilting motion body 8 is held so that it cannot be tilted forward. A hole 12 is formed in the upper surface plate of the tilting motion body 8 for weight reduction.

Reference numeral 13 indicates a spring means formed by bending a leaf spring into a substantially U-shape in a side view.
One end 13a located below and the other end 1 located above
3b and 3b are arranged so as to extend toward the rear of the chair, and the curved portion 13c is fitted to the tubular body 14 which is fitted to the second support shaft 10 so as to be rotatable or non-rotatable. 13 is configured to be freely rotatable about the second support shaft 10. In addition, the reference numeral 15 shown in FIG.
Is a collar to prevent the shaft from shifting in the axial direction,
Further, reference numeral 16 shown in FIG.
It is a stopper to prevent it from coming off.

On the inner surfaces of the left and right side plates 2a of the fixed frame body 2, a pair of left and right link rods 17, 17 formed in a V shape in a side view are rotatably pivoted by pins 18 respectively. At the upper ends of the left and right link rods 17, the seat receiving member 6 is provided.
The rollers 19 contacting the lower surface of each are pivotally supported, and the first support rod 20 with rollers as an example of an acting portion of the weight applied to the seat body 3 is mounted between the lower ends of the left and right link rods 17,
The first support rod 20 is brought into contact with the lower surface of the one end portion 13a of the spring means 13. In addition, the tilting moving body 8
A second support rod 21 with a roller as an example of a portion acting on the backrest load is mounted on the front and rear midway portions of the left and right side plates 8a in the above, and the second support rod 21 is connected to the other end portion 13b of the spring means 13. By contacting the upper surface, the backrest load when a person leans against the backrest 9 acts downward on the other end of the spring means 13 via the actuating tilting body 8 and the second support rod 21. To configure.

In the above structure, when a person sits on the seat body 3, the one end portion 13a of the spring means 13 is pressed upward through the first support rod 20 attached to the link rod 17, so that the spring means 13 is pressed. On the other hand, a force acts to rotate in the direction indicated by arrow A (one direction) in FIG.
The other end 13b of the spring means 13 is in contact with the second support rod 21 attached to the tilting motion body 8, and the tilting motion body 8 cannot be rotated upward by the wire 11 (untilting forward). Since the spring means 13 is prevented from rotating in the A direction by being held, the spring means 13 is proportional to the weight of the person sitting on the chair and is indicated by the alternate long and short dash line in FIG.
As shown by the solid line, the seat body 3 is bent and deformed, and the seat body 3 is tilted backward as shown by the alternate long and short dash line in FIG. At this time, the elastic force of the spring means 13 acts on the tilting motion body 8 so as to rotate the tilting motion body 8 upward, in other words, the reaction force that biases the backrest 9 in the forward tilting direction. It will be given in advance.

When the person sitting on the chair leans back and leans on the backrest 9, a downward force is applied to the other end 13b of the spring means 13, but in this case, the actuating tilting body 9 is applied. On the other hand, since a reaction force due to elastic deformation of the spring means 13 is given in proportion to the weight of the person sitting on the chair, a force larger than the reaction force is applied in the opposite direction to the reaction force. For the first time, the spring means 13 is flexibly deformed as shown by the two-dot chain line in FIG. 1 and the one-dot chain line in FIG. 5, and this flexural deformation imparts a locking function to the backrest 9. In that case, the reaction force that urges the backrest 9 in the forward tilt direction changes in proportion to the magnitude of the load acting on the seat body 3, in other words, the weight of the person sitting on the chair, and When the seated person has a heavy weight, the reaction force against the backrest 9 also becomes large, and unless a large force is applied, the backrest 9 does not tilt backward, but when the person who sits on the chair has a light weight, the backrest 9 does not move. The reaction force becomes small, and the backrest 9 can be tilted backward even with a small force. Therefore,
When the backrest 9 is tilted backward, the spring means 13 acts as a hard spring for a heavy person and as a soft spring for a light person. As a result, the weight of the person becomes lighter. Regardless of the weight, the backrest 9 is automatically adjusted so that the rearward tilt angle is substantially constant, and a proper sitting comfort can be provided regardless of the weight.

The pivoting portion of the tilting motion body 8 (the second support shaft 1)
The distance from 0) to the upper end of the backrest 9 is long, and a large moment acts on the spring means 13 by the rearward tilting of the body, so that a reaction force for preventing the rearward tilting is applied to the tilting motion body 8. However, the spring means 13 does not elastically deform and the backrest 9 cannot be tilted rearward.

FIG. 6 shows a modification of the first embodiment, in which the spring means 13 is made of a leaf spring and a torsion coil spring formed by winding a wire into a coil is used. It is a thing.

In the second embodiment shown in FIG. 7, the spring means 13 is used.
When the spring is formed in a lateral U shape by a leaf spring, a torsion spring, or the like, the spring means 13 has one end 13a.
And the other end portion 13b are arranged so as to extend toward the front of the chair, and the curved portion 13c is rotatably supported by the fixed frame body 2 via the tubular body 14 to form one end portion of the spring means 13. 13a
While receiving the load applied to the seat body 2 at the tilt movement body 8
A portion near the rear end is pivotally attached to the fixed frame body 2 by a horizontal pin 22, and the front end portion of the tilting motion body 8 is brought into contact with the other end portion 13b of the spring means 13 from below to form the spring means 13. The other end portion 13a of the above supports the backrest load. Reference numeral 23 is a stopper for preventing the backrest 9 from tilting forward.

In the third embodiment shown in FIG. 8, the spring means 13 is used.
Is formed by a leaf spring or a rod-shaped spring so as to extend linearly along the front-back direction of the chair, and a portion between one end and the other end thereof is rotated by the support portion 2a of the fixed frame body 2. The seat body 2 is freely pivoted and is mounted on the upper surface of the one end 13a of the spring means 13.
The backrest load is supported on the upper surface of the other end 13b of the spring means 13 while supporting the load acting on the.

The fourth embodiment shown in FIG. 9 is a spring means 13
Is composed of a rigid support plate 24, and two compression coil springs 25 and 26 provided on the upper surface of one end 24a and the upper surface of the other end 24b of the support plate 24. The middle part between the other end is pivotally attached to the fixed frame body 2 so as to be rotatable about a horizontal axis, and the compression coil spring 25 on one side supports the load from the seat body 2, The other compression coil spring 26 supports the backrest load acting on the tilt motion body 8.

In the fifth embodiment shown in FIG. 10, the seat body 3 is
While it is configured to be movable down through a pair of front and rear link mechanisms 27, when the rear end portion of the tilting motion body 8 is pivotally attached to the fixed frame body 2 in a rotatable manner, the chair 3 A spring means 13 extending linearly in the front-rear direction is provided, and a midway portion between the front end and the rear end of the spring means 13 is rotatably attached to the lower surface of the seat body 3, and one end portion of the spring means 13 is provided. The lower surface of the (front end) 13a has a support portion 2b provided on the fixed frame body 2.
On the other hand, the lower surface of the other end portion (rear end portion) 13b of the spring means 13 is brought into contact with the front end portion of the tilting motion body 8.

Further, a sixth embodiment shown in FIG. 11 is a seat 3
When the tilting motion body 8 and the tilting motion body 8 are rotatably pivoted to the front end portion of the fixed frame body 2, the spring means 13 linearly formed by a leaf spring or a rod-shaped spring body is provided at one end and the other end thereof. Is attached rotatably to the lower surface of the tilting motion body 8 at an intermediate portion between and, and the other end (front end) 13b of the spring means 13 is supported by the support portion 2b of the fixed frame body 2, while the spring means 13 is provided. At the lower surface of one end (rear end) 13a of the above, the load acting on the seat body 3 is pivotally attached to the fixed frame body 2, and the balance-type interlocking rod 2
It is indirectly supported through 8. In FIG. 11, a compression spring 2 is separately provided between the seat body 3 and the fixed frame body 2.
9, the load acting on the seat body 3 is supported by both the compression spring 29 and the spring means 13, and some percentage of the weight applied to the seat body 3 is the spring. It will act as a reaction force on the backrest 9 via the means 13. In addition, also in the other embodiments, a spring for supporting only the seat body 3 is provided separately from the spring means 13 for both the seat body 2 and the backrest 9, so that the reaction force acting on the backrest 9 is adjusted. You can

In FIG. 12, a torsion bar is used as the spring means 13. In this embodiment, both ends of the torsion bar 13 having a rectangular cross section and a substantially middle portion along the longitudinal direction are interposed by the bush 30. The torsion bar 13 is configured to freely rotate around its axis by being supported by the supporting portion 2d of the fixed frame body 2 in such a manner that the torsion bar 13 is located at one end and one end. , A pair of support arms 31 and 32 are fitted so that the support arms 31 and 32 extend toward the opposite sides of the torsion bar 13 with the axial center of the torsion bar 13 interposed therebetween. The load is supported, and the backrest load is supported by the other support arm 32. The operating tilting body may be pivotally attached to the seat body.

[Brief description of drawings]

FIG. 1 is a vertical sectional side view of a first embodiment.

FIG. 2 is a sectional view taken along line II-II of FIG.

FIG. 3 is a sectional view taken along line III-III in FIG.

FIG. 4 is a sectional view taken along line IV-IV in FIG.

FIG. 5 is a diagram showing an operation of the first embodiment.

FIG. 6 is a diagram showing a modification of the spring means in the first embodiment.

FIG. 7 is a schematic view showing a second embodiment.

FIG. 8 is a schematic diagram showing a third embodiment.

FIG. 9 is a schematic view showing a fourth embodiment.

FIG. 10 is a schematic view showing a fifth embodiment.

FIG. 11 is a schematic view showing a sixth embodiment.

FIG. 12 is a perspective view of essential parts showing a seventh embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Leg body 2 Fixed frame body 3 as an example of a support mechanism 3 Seat body 6 Seat receiver 8 Tilt motion body 9 Backrest 13 Spring means 17 Link rod 20 First support rod 21 Second support rod

Claims (1)

[Scope of utility model registration request] 1. A seat body is attached to a support mechanism provided on an upper part of a leg body so as to be capable of tilting backward or descending, and a tilting moving body which bears a backrest load can be tilted rearward to the support mechanism or the seat body. In a chair which is mounted so that it cannot be tilted forward, spring means for elastically supporting both the rearward tilting or lowering motion of the seat body and the rearward tilting motion of the tilting motion body are provided so as to be rotatable, and The weight acting on the body acts on the spring means, and the load acting on the spring means acts on the spring means from the tilting motion body by the backrest load. In order to urge the spring means in the moving direction and to rotate the spring means in the other direction by the load of the backrest, the spring means are brought into contact with each other on opposite sides of the rotation axis. Tilt control device for a chair that does.