JPH0533526A - Aseismic and vibration damping device - Google Patents

Abstract

PURPOSE:To prevent the breakage of an eccentric member caused by bending moment by the arrangement such that the axis of a universal wheel comprising an eccentric member rotatably connected to a main body which is attached to a body to be supported and a wheel passes through a supporting plane, whereby the main body supports the eccentric member. CONSTITUTION:A main body 18 is fixed to the underside of a body 12 to be supported by means of screws 20 and an eccentric member 26 is rotatably connected to the body 18 so that a wheel 31 is mounted on the member 26 to constitute a universal wheel 15. And an axis 32, which passes through the center of reaction of the wheel 31 and extends vertically, is set so as to passes through a supporting plane 33 of the body 18 which supports an axis 27. Consequently the reaction force imparted to the body 12 from a supporting body 10 is transmitted from the wheel 31 through the member 26 and the plane 33, so that bending moment is not exerted on the member 26 thereby preventing the breakage thereof.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention supports a seismic isolation device that supports a building or the like with movable wheels so that it can be moved in almost any horizontal direction and gives a restoring force when it is displaced, or wind or wind in a tall building or the like. The present invention relates to a vibration damping device in which a mass member is supported by a free wheel so as to be movable in almost horizontal directions in order to reduce shaking due to an earthquake or the like, and a restoring force is given when the mass member is displaced.

[0002]

The inventor of the present invention is Japanese Patent Publication No. 3-9268.
In order to protect buildings, computers, and various other machines from earthquakes, we propose a seismic isolation device that supports these heavy supported objects with free wheels and provides restoring force when displaced. did. Also, Japanese Patent Application No. 63-
In Japanese Patent No. 240969 and Japanese Patent Application No. 3-99726, a vibration damping device which supports a mass member having a large mass with a free wheel and gives a restoring force when displaced is also proposed. However,
When the weight of the supported body supported by the free wheel becomes large, a large bending moment may act on the eccentric member that is rotatably connected to the support body of the free wheel and supports the wheel at an eccentric position, and may be damaged. is there.

[0003]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems, and prevents a large bending moment from acting on an eccentric member of a free wheel so that the free wheel does not have a risk of being damaged, and thus a heavy supported object can be provided. It provides a seismic isolation and damping device to support.

[0004]

SUMMARY OF THE INVENTION The present invention has a free wheel for supporting a heavy supported body movably with respect to the supporting body in all directions, and receives a restoring force when the supporting body is displaced. In the vibration damping device, the free wheel has a main body attached to a supported body, an eccentric member rotatably connected to the main body, and a wheel supported by the eccentric member,
An axis line extending in the up-down direction passing through the center of the reaction force acting on the wheel passes through a bearing surface for supporting the eccentric member to provide a seismic isolation / vibration damping device.

[0005]

Embodiments of the present invention will be described below with reference to the drawings. In the embodiment of the present invention shown in FIGS. 1 to 3, 10 is a support. Reference numeral 12 denotes a supported body, which is supported on the support body 10 by three or more free wheels 15. Reference numeral 16 is a rubber member for giving an elastic restoring force when the supported body 12 is displaced. In the case of a seismic isolation device for a building, the support body 10 is the basic structure of the building and the supported body 12 is the superstructure. In the case of seismic isolation devices for various types of equipment, the support body 10 is the floor or the base and the supported body 12 is the equipment. In the case of a building vibration damping device, the support 10
Is a support member, and the supported body 12 is a mass member having a large mass.

The free wheel 15 is constructed as follows. That is, reference numeral 18 denotes a main body in which a screw 20 protruding from the lower surface of the supported body 12 is passed through and fixed by a nut 21. 22 is a bolt 23 on the lower surface of the main body 18.
The lower lid of the main body fixed by means of 25 is a cylindrical space formed in the main body 18, and the shaft portion 27 is rotatably inserted into this space so that the flange portion 28 is engaged with the lower lid 22. It is an eccentric member. A wheel 31 is mounted on the eccentric member so as to be eccentrically supported so that its center is located at a position away from the rotation axis 30 of the shaft portion 27. An axis 32 extending vertically through the center of the reaction force of the wheel passes through a bearing surface 33 of the main body 18 which supports the shaft portion 27.

Therefore, the reaction force that the supported body 12 receives from the supporting body 10 is applied from the wheel 31 to the eccentric member 26 and the bearing surface 3.
3, the bending moment can hardly be applied to the eccentric member 26. Also, when the supported body 12 tries to move with respect to the support body 10, the eccentric member 26 can respond favorably by the frictional force of the wheels 31.

Various modifications can be made in the present invention. For example, it can be applied to various cases such as a case where the supported body 12 is supported by a concave surface formed on the support body 10 without using the rubber member 16 and a restoring force is applied from the concave surface when the supported body 12 moves. I can. Further, instead of the rubber member 16, a coil spring or the like can be used. The eccentric member 26 of the free wheel 15 may be configured to be supported on the bearing surface 33 via a thrust bearing. Furthermore, a pair of wheels connected by an axle is provided,
The axle may be supported by the eccentric member 26,
In this case, the axis passing through the center of the reaction force passes through the central portion of the axle.

[0009]

Since the present invention is constructed as described above, the eccentric member 26 of the free wheel 15 which supports the supported body 12 having a large weight is damaged by almost no bending moment. Can be prevented,
Moreover, it has an effect that the function of the free wheel that it is easy to turn can be maintained.

[Brief description of drawings]

FIG. 1 is a front view showing, as a partial cross section, a portion of a free wheel, which is a main part of an embodiment of the present invention.

FIG. 2 is a bottom view thereof.

FIG. 3 is a schematic front view with a part omitted.

[Explanation of symbols]

 10 support body 12 supported body 15 universal wheel 16 rubber member 18 main body 26 eccentric member 30 rotation axis 31 wheel 32 axis line 33 bearing surface

Claims (1)

Claim: What is claimed is: 1. A seismic isolation / vibration damping device having a free wheel for supporting a supported body so as to be movable in all directions with respect to the supported body and receiving a restoring force when the supported body is displaced. The free wheel has a main body attached to a supported body, an eccentric member rotatably connected to the main body, and a wheel supported by the eccentric member, and a reaction force acting on the wheel. A seismic isolation / vibration damping device characterized in that the main body passes through a bearing surface that supports an eccentric member, and an axis line that extends vertically through the center of the