JPH0925995A - Vibration absorbing table - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vibration absorbing table for placing precision apparatuses or industrial art works, which is especially capable of effectively absorbing vertical vibration to protect articles placed on it from vibration. SOLUTION: A base plate 5 is horizontally mounted on a bottom plate 1 installed horizontally, through four coupling devices 4. Each coupling device 4 is provided with an elastic supporting means (coil spring) for supporting the load applied to the base plate to keep spacing between the bottom plate and the base plate properly, a displacement guide means (a mechanism by which an upper cylindrical body 7a and a low cylindrical body 7b are slidably fitted each other) permitting the base plate 5 to be displaced vertically under a horizontal state, and a damping means (hydraulic dampers 10) for absorbing kinetic energy of vertical displacement of the base plate 5.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vibration absorption table on which, for example, precision equipment or arts and crafts are placed, and in particular,
The present invention relates to a vibration absorbing table for absorbing a strong vertical vibration and protecting a placed article.

[0002]

2. Description of the Related Art Various vibration control / vibration isolation techniques have been developed in order to minimize the occurrence of severe vibrations such as an earthquake on a building. For example, a vibration-isolated floor structure is applied to a room accommodating fragile precision equipment and arts and crafts. First, the vibration transmitted from the ground to the building frame is suppressed, and further, the vibration transmitted to the floor of the room containing important articles that are sensitive to vibration is suppressed by the vibration isolation floor structure.

[0003]

Many conventional vibration-isolated floor structures are structures that exert a vibration-isolation effect mainly on horizontal vibrations. There are some known vibration-isolated floor structures that are also effective against vertical vibration, but they have a complicated mechanism and a significantly high floor height, resulting in a high floor height. Therefore, the height of the building becomes extremely high to realize the required number of floors, and there arises a problem that the desired number of floors cannot be achieved in an area with a height limit.

At the time of a large earthquake, it is beginning to be pointed out that the vertical seismic force works more than previously thought. With an isolated floor structure that is effective only for horizontal vibration,
If a display rack for precision equipment or arts and crafts is placed on the floor in the room, even if the display rack is prevented from falling due to the vibration isolation effect in the event of an earthquake, the items installed on the display rack due to the shock of the vertical vibration. Is likely to be damaged.

The present invention has been made in view of the above background, and an object thereof is to mount a precision equipment, arts and crafts, etc., on which vertical vibrations are effectively absorbed. It is an object of the present invention to provide a vibration absorbing table used for the purpose of protecting a stationary article from vibration.

[0006]

In the vibration absorbing base of the present invention, a base plate is horizontally mounted on a bottom plate which is installed horizontally through a movable connecting mechanism, and the movable connecting mechanism described above. Is an elastic supporting means for supporting a load applied to the base plate and appropriately maintaining a distance between the bottom plate and the base plate; a displacement guide means for allowing the base plate to be vertically displaced while being horizontal; Braking means for absorbing kinetic energy of vertical displacement of the base plate.

The braking means in this structure can be realized by a plurality of hydraulic dampers whose lower end is connected to the bottom plate and whose upper end is connected to the base plate, and which vertically expands and contracts. Further, the elastic supporting means can be realized by a coil spring mounted on the outer circumference of each hydraulic damper and compressed between the bottom plate and the base plate. The displacement guide means includes an upper cylinder body arranged on the outer circumference of each coil spring and having an upper end fixed to the base plate, and a lower cylinder body arranged on the outer circumference of each coil spring and a lower end fixed to the bottom plate. And a lower portion of the upper tubular body and an upper portion of the lower tubular body are slidably fitted.

When an article is placed on the base plate, the base plate is slightly lowered by the displacement guide means while being horizontal,
The elastic support means bears the weight of the article. The bottom plate is placed on the floor of the building, but when the floor vibrates up and down violently due to an earthquake or the like, the displacement guide means causes the base plate and the bottom plate to relatively vibrate in parallel with each other and vibrates. Energy is absorbed by the braking means. As a result, even if the bottom plate vibrates up and down violently along with the floor, the up and down vibration of the base plate is suppressed and becomes extremely small.

[0009]

1 and 2 show the structure of a vibration absorber according to an embodiment of the present invention. Four casters 2 are attached to the lower surface of the bottom plate 1, and are horizontally placed on the floor 3 of the building and movable. A base plate 5 is horizontally mounted on the upper surface side of the bottom plate 1 via four couplers 4. In this embodiment, a showcase 6 for displaying articles is integrally provided on the base plate 5. The above-mentioned movable coupling mechanism is composed of four couplers 4, and these couplers 4 realize the above-mentioned elastic support means, displacement guide means, and braking means as follows.

The detailed structure of the coupler 4 is shown in FIG. The upper end of the upper cylinder 7a is fixed to the lower surface of the base plate 5, and the lower end of the lower cylinder 7b is fixed to the upper surface of the bottom plate 1. The upper tubular body 7a and the lower tubular body 7b are arranged on the same vertical line, and the inner diameter of the upper tubular body 7a and the outer diameter of the lower tubular body 7b are substantially equal to each other. The upper portion of 7b is slidably fitted. Each of the four couplers 4 has a fitting mechanism for the upper cylinder body 7a and the lower cylinder body 7b, which serves as the displacement guide means, and the base plate 5 remains horizontal with respect to the bottom plate 1 so that only vertical movement is possible. Permissible.

Inside the cylindrical bodies 7a and 7b of the coupler 4, a coil spring 9 is mounted in a compressed state by being sandwiched between upper and lower spring receivers 8a and 8b attached to the base plate 5 and the bottom plate 1, respectively. The coil springs 9 are the elastic supporting means described above, and the weight of the article placed on the base plate 5 is elastically supported by each coil spring 9.

Inside the coil spring 9 of the coupler 4, a hydraulic damper 10 as the braking means is attached. The hydraulic damper 10 is a direct-acting dashpot, is vertically arranged, and has a lower end axially coupled to the bracket 11 of the bottom plate 1 and an upper end axially coupled to the bracket 12 of the base plate 5. As is well known, in the hydraulic damper 10, the piston rod moves in and out of the cylinder to expand and contract over its entire length, and the hydraulic dashpot has a braking action on its expanding and contracting motion.

As is clear from the above description of the structure, the base plate 5
When precision equipment, arts and crafts, etc. are arranged in the showcase 6 above, the coil springs 9 are compressed by the weight thereof and the base plate 5 is slightly lowered while being horizontal. When the floor 3 of the building on which the vibration absorbing base is placed violently vibrates vertically due to an earthquake or the like, the base plate 5 and the bottom plate 1 are parallel to each other by the displacement guide means composed of the slide fitting mechanism of the cylinders 7a and 7b. The vibration energy is absorbed by the braking means including the hydraulic dampers 10. As a result, even if the bottom plate 1 vibrates up and down violently along with the floor 3, the up and down vibration of the base plate 5 is suppressed and becomes extremely small. Therefore, the displayed articles in the showcase 6 are protected from vibration.

[0014]

According to the vibration absorbing base of the present invention, when an article is placed on the base plate, the displacement guide means causes the base plate to be slightly lowered while being horizontal, and the elastic support means allows the elastic support means to move the article. Supports weight. The bottom plate is placed on the floor of the building, but when the floor vibrates up and down violently due to an earthquake or the like, the displacement guide means causes the base plate and the bottom plate to relatively vibrate in parallel with each other and vibrates. Energy is absorbed by the braking means. As a result, even if the bottom plate vibrates up and down violently along with the floor, the up and down vibration of the base plate is suppressed and becomes extremely small. Therefore, the article placed on the base plate is protected from vibration. In addition, as described above, it is desirable to place the vibration absorbing base of the present invention on the floor of the building that adopts the vibration isolation floor structure that effectively suppresses the horizontal vibration, and thus, the effect of protecting the placed article from the vibration can be obtained. It will be extremely high.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of a vibration absorber according to an embodiment of the present invention.

FIG. 2 is a detailed configuration diagram of a coupler 4 in the embodiment.

[Explanation of symbols]

 1 bottom plate 2 caster 3 floor 4 coupler 5 base plate 6 showcase 7a upper cylinder 7b lower cylinder 8a, 8b spring receiver 9 coil spring 10 hydraulic damper 11, 12 bracket

Claims (2)

[Claims] 1. A base plate is horizontally mounted via a movable connecting mechanism on a horizontally installed bottom plate, and the movable connecting mechanism supports a load applied to the base plate and the bottom plate and the base plate. Equipped with elastic support means for appropriately maintaining the space between the base plates, displacement guide means for allowing the base plate to be vertically displaced while being horizontal, and braking means for absorbing the kinetic energy of the vertical displacement of the base plate. A vibration absorber that is characterized by 2. The braking means comprises a plurality of hydraulic dampers, the lower end of which is coupled to the bottom plate and the upper end of which is coupled to the base plate, and which expands and contracts in the vertical direction. The elastic supporting means includes a plurality of hydraulic dampers. The displacement guide means is mounted on the outer periphery and is compressed between the bottom plate and the base plate, the displacement guide means is disposed on the outer periphery of each of the coil springs, and an upper cylinder body having an upper end fixed to the base plate; A lower cylinder arranged at the outer circumference of the coil spring and having a lower end fixed to the bottom plate, and a lower part of the upper cylinder and an upper part of the lower cylinder are slidably fitted together. The vibration absorber according to claim 1.