JPH0518998Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] The present invention is a chair configured such that the seat plate can be raised and lowered via gas springs built into the cylindrical legs. The present invention relates to the structure of a cylindrical cover device that covers a spring.

[Conventional technology and its issues]

The lower end of the piston rod of the gas spring is installed inside the cylindrical leg body, while the upper end of the cylinder of the gas spring is fixed to the support of the seat plate, and by expanding and contracting this gas spring, the height position of the seat plate can be adjusted. For chairs that can be adjusted according to the height of the person sitting, as disclosed in Japanese Utility Model Publication No. 62-4204, the difference in the thickness of the gas springs for the cylindrical legs A cylindrical cover that covers the outer periphery of the leg body for the purpose of making it inconspicuous, improving appearance, and preventing clothing from getting caught in the sliding part between the leg body and the gas spring. In order to allow the body to move up and down integrally with the cylinder of the gas spring, it is proposed that the center hole of the locking piece provided at the top of the inner diameter of the cover is locked to the upper engagement step on the outer periphery of the cylinder. There is.

In this prior art, there is a slight gap between the upper end edge of the cylindrical cover body and the support of the seat plate, and the center hole of the locking piece in the cylindrical cover body is located in the center of the gas spring. Since the cover body is simply supported by being fitted onto the engagement step portion on the outer periphery, the cover body may tilt at the contact point between the engagement step portion and the locking piece, and, The cover body rattles up and down by the size of the gap, and the cover body rubs against the outer periphery of the leg body, causing abnormal noise, and the sense of unity between the cover body and the support body due to the rattling is lost. There was also a problem that the appearance was not good.

The purpose of the present invention is to eliminate this rattling and provide a chair with a sense of unity.

[Means to solve the problem]

Therefore, the present invention provides a chair in which the lower end of a gas spring is installed in a cylindrical leg body of the chair, and the upper end of the gas spring is fixed to a support of a seat plate so that the legs can be raised and lowered. A plurality of elastic bodies are provided radially on the inner diameter part of the cylindrical cover body that loosely fits around the outer periphery of the body, and each elastic body has a proximal end fixed to the cover body and a distal end extending in the direction of the cross-sectional center of the cover body. The distal end side of the cover body is supported by the support part of the gas spring formed at a position higher than the base end of each elastic body, and the upper end edge of the cover body is moved in a direction in which the upper end edge of the cover body is brought into close contact with the lower surface of the support body of the seat plate. It is configured to be energized.

[Functions and effects of the invention]

According to this configuration, since the proximal ends of the plurality of elastic bodies whose distal ends extend in the center direction are fixed to the inner diameter part of the cover body, the distal ends of each elastic body are fixed to the proximal ends of each elastic body. After fitting the cover body while supporting it on the support part of the gas spring formed at a higher position, it is only necessary to fix the upper end of the gas spring to the support body of the seat plate, making the installation process of the cover body extremely easy. It's easy.

By simply attaching the cover body in this way, you can determine the height position of the proximal end of each elastic body provided in the inner diameter of the cover body, and the height position of the point where the distal end side of the elastic body is supported by the support part. Due to the difference between It is extremely easy to press the bottom surface.

As described above, according to the present invention, the upper edge of the cover body can be brought into close contact with the lower surface of the support of the seat plate, and this has the effect that the cover body does not wobble due to the upward pressing force of the elastic member. It is something.

Moreover, the cover body has a sense of unity with the support body, and has the effect that the appearance is extremely improved.

〔Example〕

Next, to explain an embodiment, in the figure, reference numeral 1 denotes a cylindrical leg body 3 having a plurality of leg rods 2 radially protruding from the lower end, and a gas spring 4 inserted into the inner diameter part of the leg body 3. By fixing the upper end of the gas spring 4 to the support body 6 of the seat plate 5 while attaching the lower end thereof so that it cannot be removed, the gas spring 4
This shows a chair in which the height of the seat plate can be adjusted by expanding and contracting the seat plate, and is rotatable around the axis of a gas spring 4.

Reference numeral 7 designates a piston rod in the gas spring 4, and the lower end of the piston rod 7 is attached to a support piece 8 at the lower end of the leg 3 with a washer 9 and a stop ring 1.
0, and is permanently attached via code 11.
is a piece of rubber for cushions. Reference numeral 12 denotes a truncated cone-shaped attachment portion protruding from the upper end of the cylinder 13 of the gas spring 4, which can be fitted and fixed onto the conical tube-shaped attachment portion 14 of the support body 6 from above.

Reference numeral 15 denotes a cylindrical cover body fitted to cover the outer periphery of the cylinder 13 in the leg body 3 and the gas spring 4, and on the inner diameter upper part of the cover body 15,
A plurality of elastic bodies 16 are provided in a radial manner, the base ends of which are fixed to the cover body 15, and the distal ends of which extend in the direction of the center of the cross section of the cover body 15.

In this case, the cover body 15 and the plurality of elastic bodies 16 may be integrally molded from a synthetic resin material. Further, reference numeral 17 is a slit groove cut out to allow each elastic body 16 to bend independently, and the tip side of each elastic body 16 can be fitted into the mounting portion 12 of the gas spring 4, and The lower surface of each elastic body 16 on the distal end side is brought into contact with and supported by a step-shaped support portion 18 of the gas spring 4 that is connected to the mounting portion 12 projecting from the upper end of the cylinder 13 .

When each elastic body 16 is made to protrude horizontally, the height from the base end of each elastic body 16 to the upper edge 15a of the cover body 15 is greater than the height from the support part 18 to the lower surface of the support body 6. By increasing the size, when the cover body 15 is attached, the tip side of each elastic body 16 is supported by the gas spring 4, and the upper end edge of the cover body 15 is brought into close contact with the lower surface of the support body 6 of the seat plate. It can be energized.

In any case, when the gas spring 4 is fitted with the cover body 15 and attached to the support body 6,
The support portion 18 of the gas spring 4 is located at a higher position than the base end portion of each elastic body 16 .

Note that reference numeral 21 is an operating lever for operating the operating valve 22 in the gas spring 4;
1 is disposed above the operating valve 22 through a notch 25 cut out in the transparent hole 23 in the cover body 15 and an insertion hole 24 penetrating the cylinder 13 in the lateral direction.

With this configuration, the lower end of the piston rod 7 of the gas spring 4 inserted into the inner diameter of the leg body 3 is supported by the support piece 8.
After mounting on the gas spring 4, the cover body 15 is placed over the mounting portion 12 of the gas spring 4, and further,
The support body 6 at the lower end of the seat plate 5 is connected to the mounting portion 12.
, and insert the attachment part 12 into the attachment part 13.

As a result, the upward biasing force of the elastic body 16 of the cover body 15 allows the cover body 15 to be brought into close contact with the lower surface of the support body 6, and the cover body 15 does not wobble thereafter.

The operating rod 21 can be inserted from the side after attaching the cover body 15 as described above, and when the operating valve 22 is pushed by rotating the tip of the operating rod 21 upward or downward, the piston rod 7 in the gas spring 4 can be projected. The height of the seat plate 5 can be arbitrarily adjusted by moving the cylinder 13 up and down with respect to the leg body 3.

In these cases, since the cover body 15 can be raised and lowered integrally with the cylinder 13 of the gas spring 4, it is possible to give a sense of unity in design to the cover body 15 of the support body 6 of the seat plate 5. , only the expansion and contraction of the dimension H is visible between the upper surface of the leg rod 2 and the lower edge of the cover body 15.

In the second embodiment shown in FIG. 5, the upper end edge 15a of the cover body 15 is bent in the inner radial direction, and the lower end of the cylindrical member 19 made of a leaf spring is formed to fit under the upper end edge 15a. By configuring a plurality of elastic bodies 20 by bending them radially in the inner diameter direction through the slit grooves, the base end of each elastic body 20 is fixed to the cover body 15, and each elastic body 2
The tip end side of 0 extends in the direction of the center of the cross section of the cover body 15.

If this cylindrical member 19 is fitted together with the cover body 15 from above the cylinder 13 of the gas spring 4, and then the support body 6 of the seat plate 6 is fitted to the mounting part 12, each The distal end side of each elastic body 20 is pressed by the step-shaped support portion 18 of the gas spring 4 formed at a higher position than the proximal end of each elastic body 20 and curved,
Due to the elastic deformation, the upper edge of the cover body 15 can be brought into close contact with the lower surface of the support body 6.

Note that at least one pair of each of the elastic bodies 16 and 20 is sufficient, and the support portion on which the tip side of each elastic body is supported may be not only the step-shaped support portion 18 of the gas spring 4 but also another protrusion-shaped support portion. Needless to say, it's good to have it.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, in which Fig. 1 is a perspective view of the chair, Fig. 2 is an enlarged side sectional view of the main part, Fig. 3 is a perspective view showing the cover body and the upper part of the gas spring, and Fig. 4 is a perspective view of the chair.
The figure is a cross-sectional view taken from - in FIG. 2, and FIG. 5 is a side cross-sectional view of the main part of the second embodiment. DESCRIPTION OF SYMBOLS 1... Chair, 3... Leg body, 4... Gas spring, 5... Seat plate, 6... Support body, 7... Piston rod, 8... Support piece, 12... Mounting part, 13
...Cylinder, 15...Cover body, 16, 20...
...Elastic body, 17...Slit groove, 18...Support part, 19...Cylindrical member, 21...Operation rod, 22...
...Operation valve.

Claims (1)

[Scope of utility model registration request] In a chair in which a lower end of a gas spring is installed in a cylindrical leg body of the chair, and an upper end part of the gas spring is fixed to a support of a seat plate so as to be movable up and down, the chair is loosely fitted around the outer periphery of the leg body. A plurality of elastic bodies are radially provided on the inner diameter part of the cylindrical cover body, the base end of which is fixed to the cover body, and the distal end side of which extends in the direction of the cross-sectional center of the cover body. The cover body is configured to be supported by a support part of the gas spring formed at a position higher than the base end of each of the elastic bodies, and to bias the upper end edge of the cover body in a direction in which it comes into close contact with the lower surface of the support body of the seat plate. A cover device for the legs of a chair, characterized by: