JP2539240B2 - Anti-vibration leg - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vibration-proof structure for legs of furniture and office machines, legs of machinery and heavy structures such as buildings.

[Conventional technology]

As a vibration isolation means for furniture and heavy structures such as chairs and desks, a structure in which a vibration-proof rubber body is provided at the lower end of the legs, or a part of the legs is vertically expanded and contracted and a spring is interposed between them Has been known for a long time.

Further, in the leg portion that supports the floor in a building or the like, as shown in FIG. 2, the lower end portion 4 of the support bolt (bar-shaped leg portion) 1 is inserted into the hole of the vibration-proof rubber body (rubber pedestal) 5, Some support bolts have a structure in which a flange portion 3 projecting from a part thereof supports the support bolt on a rubber pedestal 5. In this case, the hole of the rubber pedestal 5 penetrates to the bottom, and the bottom portion of the support bolt faces the foundation floor surface with a slight space.

[Problems to be solved by the invention] In the structure in which a rubber pedestal having a through hole is provided at the lower end of the rod-shaped leg portion as described above, the total load applied to the rod-shaped leg portion is applied only to the rubber pedestal in contact therewith, and Since it is supported and absorbed only by elasticity, it cannot be said that it can sufficiently cope with the sudden shock from the upper part and the attenuation and absorption of subtle vibration.

In addition, even when a spring is used, if the spring is weak, it is ineffective for a large load, and if it is too strong, it cannot cope with delicate vibrations, as in the case of rubber.

As a result, the mechanical device supported by such legs may be destroyed by vibration and impact, or the body of a person walking on the floor supported by such legs may feel uncomfortable.

The present invention is intended to solve such a problem, and an object thereof is to provide a leg structure having excellent vibration damping properties.

[Means for solving the problem]

In order to achieve the above object, according to the present invention, a rod-shaped leg portion having a flange portion projecting laterally at a position spaced apart from a lower end by a predetermined distance and a non-through hole opening in a substantially central portion of an upper surface are provided. And a rubber pedestal, and the lower end of the rod-shaped leg is inserted into the non-through hole of the rubber pedestal so that an air chamber is formed in the lower part thereof, and the lower end of the rod-shaped leg and the rubber pedestal are formed. A non-vibrating lubricant is interposed between the non-penetrating hole and the rod-shaped leg portion so as to be erected so as to be supported by the upper surface of the rubber pedestal through the flange portion. Provided.

[Operation of the Invention] According to the vibration-proof leg of the present invention having the above-described configuration, the air chamber is formed in an airtight state between the lower end of the rod-shaped leg and the non-through hole of the rubber pedestal. Since the air chamber acts as an air cushion, it has a large effect of absorbing a sudden shock or a subtle vibration, and the vibration damping effect is improved.

〔Example〕

FIG. 1 shows an embodiment of the present invention and is a cross-sectional view of an essential part of a vibration-proof leg body.

Reference numeral 1 is a rod-shaped leg portion, and a screw portion 2 is provided on the upper portion thereof.
Is engraved, and the screw portion of the receiving plate that supports the floor panel or the screw portion of the seat portion of the chair can be screwed onto the upper end of the screw portion so that the height can be adjusted. A dish-shaped flange portion 3 is integrally provided so as to project laterally at a position spaced apart from the lower end of the rod-shaped leg portion 1 by a predetermined distance. It is formed on the round bar portion 4.

Reference numeral 5 denotes an anti-vibration rubber pedestal, which is a pedestal made of a relatively hard rubber material made of synthetic rubber or the like and provided with a non-penetrating hole 6 that is open at approximately the center of the upper surface.

The round bar portion 4 at the lower end of the rod-shaped leg portion 1 is rotatably inserted into the non-through hole 6 of the rubber pedestal 5 and is supported by the upper surface of the rubber pedestal 5 via the flange portion 3. Will be erected on. A non-volatile lubricating oil such as silicone oil is filled or applied between the non-through hole 6 of the rubber pedestal 5 and the round bar 4 of the bar-shaped leg 1. Since the depth of the non-through hole 6 is set to be larger than the length of the round bar portion 4 inserted therein, the air chamber 8 is formed in the lower part of the non-through hole 6 in an airtight state, and this serves as an air cushion. Will always work.

A washer 7 is inserted between the flange portion 3 of the rod-shaped leg portion 1 and the upper surface of the rubber pedestal 5.

[Effects of the Invention] The effects obtained by the present invention embodied in the structures of the above-described examples are as follows.

(1) The rod-shaped leg portion is supported on the upper surface of the rubber pedestal through a washer by a flange portion protruding to the side thereof, and the load of the rod-shaped leg portion is always applied to the rubber pedestal.
When a shock or vibration is applied to the rod-shaped leg portion, a part is absorbed by the elastic force of the rubber pedestal itself, but a part is absorbed by the air chamber existing below the rod-shaped leg portion, which has a large vibration damping effect. The elasticity of air is much larger than that of rubber, and it can withstand sudden shocks and subtle vibrations.

(2) The lower end of the rod-shaped leg is inserted into the non-through hole of the rubber pedestal, and the lower end of the rod-shaped leg and the non-through hole are sealed with a non-volatile lubricating oil. The lower end portion and the non-through hole of the rubber pedestal are kept in close contact with each other, the air chamber is always kept airtight, and the vibration isolation effect is maintained.

(3) By making the lower end portion of the rod-shaped leg portion a round rod portion, the rod-shaped leg portion is rotatably erected in the non-through hole of the rubber pedestal, and it is possible to cope with impact and vibration in the rotation direction applied to the leg portion. .

Due to these effects, damage to mechanical devices supported by the rod-shaped legs is eliminated, or discomfort to the body of a person walking on the floor supported by it is eliminated and squeak noise is eliminated, and the stability of buildings etc. is improved. The effect is great such that it can be held and the life can be extended.

Although the present invention has been specifically described based on the embodiments, the present invention is not limited to the above embodiments, and various modifications can be made without departing from the scope of the invention.

For example, the lower end of the rod-shaped leg portion may be formed into a non-circular shape, for example, a hexagonal cross-section instead of the round rod portion, while the non-through hole of the rubber pedestal may be a hexagonal hole. In this case, the rod-shaped leg portion can be applied to an application in which the rod-shaped leg portion is not rotated with respect to the rubber pedestal. The shape (outer shape) of the anti-vibration rubber pedestal is not limited to the shape shown in FIG. 1 and can take various shapes.

INDUSTRIAL APPLICABILITY The present invention can be applied to chairs, furniture such as desks and pianos, heavy office machines, machine tools, and vibration-proof legs of industrial machinery.

Further, the present invention can be applied as a leg portion of a support fitting that supports a floor of a building, a movable structure or the like on a foundation floor surface.

[Brief description of drawings]

FIG. 1 is a sectional view of an essential part showing an embodiment of a vibration-proof leg body according to the present invention. FIG. 2 is a sectional view showing an example of a conventional anti-vibration leg. 1 ... Rod-shaped leg part, 2 ... Screw part, 3 ... Flange part, 4
…… Round bar, 5 …… Rubber pedestal, 6 …… Non-through hole, 7 ...
… Washers, 8 …… Air chamber.

Claims (2)

(57) [Claims] 1. A rod-shaped leg portion having a flange portion protruding laterally at a position spaced apart from a lower end by a predetermined distance, and a rubber pedestal having a non-penetrating hole opening at a substantially central portion of an upper surface thereof. The lower end of the leg is inserted into the non-through hole of the rubber pedestal so that an air chamber is formed in the lower part thereof, and a non-volatile portion is provided between the lower end of the rod-shaped leg and the non-through hole of the rubber pedestal. A vibration-proof leg body, wherein a bar-shaped leg portion is erected so as to be supported by the upper surface of a rubber pedestal via the flange portion with a hydrophilic lubricant interposed. 2. The vibration proof according to claim 1, wherein at least a lower end portion of the rod-shaped leg portion has a circular cross section and is rotatably fitted into a non-through hole of a rubber pedestal. Leg.