JPH0925993A - Vibration absorbing table - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vibration absorbing table which serves as a table for placing precision apparatuses or industrial art works, and which is especially capable of effectively absorbing vertical vibration to protect the placed articles from vibration. SOLUTION: A base plate 5 is horizontally mounted on a bottom plate 1 installed horizontally, through four connectors 4. Box-type frame parts 7 provided integrally with the base plate so as to extend downward from the outer perimeter of the base plate 5, cover the outer perimeter of the bottom plate 1 in order for both the frame parts and the bottom plate to be slidably fitted each other, and by the fitting, a displacement guide means permitting the base plate 5 to be displaced vertically in keeping a horizontal state is formed. The connectors 4 are provided with elastic supporting means (coil springs) for supporting the load applied to the base plate 5 to properly keep spacing between the bottom plate 1 and the base plate 5, and damping means (hydraulic dampers) 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]

According to the vibration absorber of the present invention, a base plate is horizontally mounted on a horizontally installed bottom plate through a movable connecting mechanism. A box form part integrally provided so as to extend downward covers the outer periphery of the bottom plate and slidably fits both, and this fitting allows the base plate to be vertically displaced while being horizontal. And a movable guide mechanism for supporting the load applied to the base plate to appropriately maintain the distance between the bottom plate and the base plate, and the upper and lower sides of the base plate. Braking means for absorbing kinetic energy of displacement.

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.

When an article is placed on the base plate, the base plate is slightly lowered in a horizontal state by a displacement guide means composed of a slide fitting mechanism of the box form part and the bottom plate, and the elastic supporting means is provided. Supports 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]

BEST MODE FOR CARRYING OUT THE INVENTION The structure of a vibration absorber according to an embodiment of the present invention is shown in FIGS. 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 the above-mentioned elastic support means and braking means are realized by these couplers 4 as follows.

The bottom plate 1 and the base plate 5 are rectangular with the same size. A rectangular box frame 7 is integrally formed on the rectangular outer periphery of the base plate 5 so as to extend downward. The box frame 7 is fitted so as to cover the rectangular outer periphery of the bottom plate 1. There is a very small gap in the fitting portion between the box form part 7 and the bottom plate 1, and a sliding member 8 is provided at a required portion at the contact portion between the two, so that both fit very smoothly and slidably. I am fit. The slide fitting structure between the box frame 7 and the bottom plate 1 serves as the displacement guide means described above, and the base plate 5 is allowed to move vertically while remaining horizontal to the bottom plate 1.

The detailed structure of the coupler 4 is shown in FIG. 2, and its mounting state is shown in FIG. The coupler 4 includes a coil spring 9 as the elastic support means and a hydraulic damper 10 as the braking means. The hydraulic damper 10 is a direct-acting dashpot, and as is well known, the piston rod 10b moves in and out of the cylinder 10a to expand and contract its entire length. It works.

A base plate 11 also serving as a spring receiver is fixed to one end of the hydraulic damper 10, and a base plate 12 also serving as a spring receiver is fixed to the other end. The coil spring 9 arranged so as to surround the outer periphery of the hydraulic damper 10 has two base plates 11 and 12.
It is sandwiched between them in a compressed state.

As shown in FIG. 3, the bracket 13 of the upper base plate 11 of the coupler 4 is attached to the bracket 13 fixed to the lower surface of the base plate 5 so as to be rotatable around a horizontal axis P. Further, the bracket of the lower base plate 12 of the coupler 4 is attached to the bracket 14 fixed to the upper surface of the bottom plate 1 so as to be rotatable around a horizontal axis Q. The axes P and Q are parallel. Further, although four couplers 4 are arranged near the four corners of the rectangular bottom plate 1 and the base plate 5, the axes P and Q of the two couplers 4 located diagonally are parallel to each other, and The axes P and Q of the two couplers 4
Is orthogonal to the above two (see FIG. 1).

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 table is placed violently vibrates up and down due to an earthquake or the like, the base plate 5 and the bottom plate 1 are moved by the displacement guide means composed of the slide fitting mechanism of the box frame 7 and the bottom plate 1.
And relatively vibrate in a state where they are parallel to each other, and 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.

Another embodiment of the mounting structure of the coupler 4 is shown in FIG. Here, the lower base plate 12 of the coupler 4 is non-rotatably fixed to the bracket 14 of the bottom plate 1, and the upper base plate 11 and the bracket 13 of the base plate 5 are fixed.
And are connected by a ball joint structure 15.

[0016]

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. Although the bottom plate is placed on the floor of the building, when the floor vibrates up and down violently due to an earthquake or the like, the base plate and the bottom plate are displaced by the displacement guide means including the slide fitting mechanism of the box form part and the bottom plate. Vibrate relatively while keeping parallel to each other, and the vibration 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.

FIG. 3 is a view showing a mounting structure of a coupler 4 in the above embodiment.

FIG. 4 is a view showing another example of a mounting structure of the coupler 4.

[Explanation of symbols]

 1 Bottom plate 2 Casters 3 Floor 4 Combiner 5 Base plate 6 Showcase 7 Box form part 8 Sliding material 9 Coil spring 10 Hydraulic damper 10a Cylinder 10b Piston rod 11, 12 Base plate 13, 14 Bracket 15 Ball joint structure

Claims (2)

[Claims] 1. A box form part integrally mounted so that a base plate is horizontally mounted on a horizontally installed bottom plate through a movable connecting mechanism and extends downward from the outer periphery of the base plate. Covers the outer periphery of the bottom plate and is slidably fitted to each other, and by this fitting, displacement guide means is configured to allow the base plate to be vertically displaced while being horizontal, and the movable connecting mechanism is Elastic support means for appropriately supporting the load applied to the base plate to keep the space between the bottom plate and the base plate appropriately, and a braking means for absorbing the kinetic energy of the vertical displacement of the base plate. Vibration absorption table. 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, and the elastic support means includes a plurality of hydraulic dampers. The vibration absorber according to claim 1, comprising a coil spring mounted on the outer periphery and compressed between the bottom plate and the base plate.