JPH0437480Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial field of application] The present invention is a chair in which the seat plate is movable up and down via gas springs built into the legs on a cylinder. 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 can be tilted at the contact point between the engagement step portion and the locking piece. The body wobbles up and down by the size of the gap, 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, and the appearance deteriorates. There was also the problem that things got better.

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. An elastic member is inserted into the inner diameter part of the cylindrical cover body that loosely fits around the outer periphery of the body, and the lower end of the elastic member is supported by the gas spring or the upper part of the leg as appropriate. By pressing the upper end into contact with a locking piece protruding from the inner diameter portion of the cover body, the upper end edge of the cover body is closely urged against the lower surface of the support member of the seat plate.

[Functions and effects of the invention]

According to this configuration, if the cover body is fitted with the lower end of the elastic member supported by the gas spring or the support part provided at an appropriate upper part of the leg body, the inner diameter part of the cylindrical cover body will protrude. The upper end of the elastic member comes into contact with the lower surface of the locking piece, and then all that is required is to secure the upper end of the gas spring to the support of the seat plate, making it extremely easy to attach the elastic member and cover body. Since the cover body is biased upward by the elastic member, the upper edge of the cover body can be brought into close contact with the lower surface of the support body of the seat plate, and the upward pressing force of the elastic member causes the cover body to be pressed upwardly. This has the effect that there is no rattling.

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 the inner diameter upper part of the cover body 15 includes:
A locking piece 17 having a hole 16 that can be fitted onto the cylinder 13 or mounting portion 12 of the gas spring 4
is installed protrudingly.

Reference numeral 18 denotes an elastic member for pressing the cover body 15 upward to bring the upper edge of the cover body into close contact with the lower surface of the support body 6;
In the embodiment, the elastic member 18 is formed in the shape of a coil spring, and the lower end of the elastic member 18 is supported in contact with a stepped support portion 19 that connects to the mounting portion 12 of the gas spring 4 that protrudes from the upper end of the cylinder 13. It is something.

Reference numeral 20 protrudes downward from the lower surface of the locking piece 17 to cover the outer periphery of the elastic member 18 and is slidably fitted onto the outer periphery of the cylinder 13 to cover the cover body 15 on the cylinder 13 and on the outer periphery of the leg body 3. It is a guide tube that is held concentrically with respect to the guide tube.

Furthermore, the reference numeral 21 is an operating rod for operating an operating valve 22 in the gas spring 4, and the operating rod 21 is horizontally connected to a watermark hole 23 in the cover body 15, a notch 25 cut out at the lower end of the guide tube 20, and the cylinder 13. It is disposed above the operating valve 22 via a through hole 24 that penetrates in the 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 the coil-shaped elastic member 18 is fitted to the mounting portion 12 of the gas spring 4, the cover body 15 is placed over the coil-shaped elastic member 18, and the support member at the lower end of the seat plate 5 is attached to the mounting portion 12. 6 and insert the attachment part 12 into the attachment part 13.

Thereby, the cover body 15 can be brought into close contact with the lower surface of the support body 6 by the upward biasing force of the elastic member 18, and the cover body 15 will not wobble after that.

The operating rod 21 can be inserted from the side after attaching the cover body 15 and the elastic member 18 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 is pressed. can be protruded, cylinder 13
By moving up and down relative to the legs 3, the height of the seat plate 5 can be adjusted as desired.

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

4 and 5 show a second embodiment, in which the elastic member 2
Reference numeral 6 is made of a leaf spring material formed into a V-shape or a U-shape when viewed from the side, and is formed into an annular shape when viewed from above, and its inner diameter hole 27 is fitted into the mounting portion 12, and its bent lower end 28 is connected to the cylinder. 13 is placed on the step-shaped support section 19 at the base of the upper end and the attachment section 12, while pressing the upper end abutting section 29 protruding from the outer periphery of the elastic member 26 against the lower surface of the locking piece 30 protruding into the inner diameter of the cover body 15. The cover body 15 is urged upward by the elastic deformation caused by the curvature of the elastic member 26.

It should be noted that the elastic member 31 may be made of a plate spring material and curved into a W-shape when viewed from the side, as shown by the dashed line in FIG. Not even.

FIG. 6 shows a third embodiment, in which the lower end of an elastic member 31 made of a leaf spring is formed into a W-shape in side view and an annular shape in plan view, similar to that shown by the dashed line in FIG. While the bent portion 32 is placed on an annular support portion 33 protruding from the outer periphery of the cylinder 13, the upper end abutting portion 34 of the elastic member 31 is pressed against the locking piece 17 protruding from the inner diameter of the cover body 15. This is a configuration that allows you to win. In this case, a coiled elastic member 35 may be used as shown by the dashed line in FIG.

FIG. 7 shows a fourth embodiment, in which an operating valve 22' is protruded from the upper end of a conical-headed cylindrical mounting portion 12' that protrudes from a cylinder 13' in a gas spring inserted into a cylindrical leg body 3'. At the same time, the operating rod 2 is pivotally connected to the support 6' of the seat plate so as to be able to move up and down.
The proximal end of the valve 1' faces the upper part of the operating valve 22'.

A locking piece 38 with a central hole 37 is provided protruding from the upper part of the inner diameter of a cylindrical cover body 15' that covers the outer periphery of the leg body 3' and the upper part of the cylinder 13' of the gas spring, and a coiled elastic member is provided. Reference numeral 39 is provided between the locking piece 38 and the stepped support portion 40 at the upper end of the leg 3'.

In this embodiment, the vertical distance between the upper end of the cylinder 13 and the upper end of the cover body 15' and the upper end of the leg body 3' changes greatly in accordance with the expansion and contraction of the gas spring with respect to the leg body 3'. It is necessary to construct it with a material with a large amount of expansion and contraction to accommodate this.

Note that the reference numeral 41 in FIG. 7 is a guide tube that is slidably abutted on the outer periphery of the leg 3'.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention; FIG. 1 is a perspective view of the chair, FIG. 2 is a side sectional view of the main part, FIG. 3 is a cross-sectional view taken from the side of FIG. 2, and FIG. 4 is a second embodiment 5 is a sectional side view of the main part of FIG. 4, and FIG.
The figure is a side sectional view of the main part of the third embodiment, and FIG. 7 is a side sectional view of the main part of the fourth embodiment. 1... Chair, 3, 3'... Leg, 4... Gas spring, 5... Seat plate, 6, 6'... Support, 7
...Piston rod, 8...Support piece, 12,1
2'...Mounting part, 13, 13...Cylinder, 1
5, 15'... Cover body, 17, 38... Locking piece,
18, 26, 31, 39...Elastic member, 19, 3
3, 40...Support part, 21, 21'...Operation rod,
22, 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. An elastic member is inserted into the inner diameter part of the cylindrical cover body, and the lower end of the elastic member is supported by the gas spring or the upper part of the leg body, while the upper end of the elastic member is inserted into the inner diameter part of the cover body. 1. A cover device for a leg body of a chair, characterized in that the upper end edge of the cover body is closely biased against the lower surface of the support body of the seat plate by being pressed into contact with a locking piece protruding from the inner diameter part.