JPH0925992A - 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 mounted horizontally on a bottom plate 1 horizontally installed, through coil springs 9 and hydraulic dampers 10. Box-type frame parts 7 provided integrally with the base plate so as to extend downward from the outer periphery of the base plate 5, cover the outer periphery of the bottom plate 1, in order for both the frame parts and the bottom plate to be slidably fitted each other. Thus, a displacement guide means permitting the base plate 5 to move vertically in a horizontal position, is formed. Plural coil springs 9 (elastic supporting means) arranged between the bottom plate 1 and the base plate 5 in a compressed state, support the load applied to the base plate 5 to suitably keep spacing between the bottom plate 1 and the base plate 5. Plural hydraulic dampers 10 (damping means), both ends of which are respectively connected to the bottom plate 1 and the base plate 5, and which are arranged to be tilted, absorb 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. The movable coupling mechanism is configured to support the load applied to the base plate by a plurality of coil springs arranged in a compressed state between the bottom plate and the base plate, and Elastic support means for appropriately maintaining the space between the base plates and a plurality of hydraulic dampers diagonally arranged with both ends respectively coupled to the bottom plate and the base plate absorb the kinetic energy of the vertical displacement of the base plate. And braking means.

When an article is placed on the base plate, the base plate is kept horizontal and slightly descended by a displacement guide means composed of a slide fitting mechanism of the box frame part and the bottom plate, and is composed of the coil spring. The elastic support means bears the weight of the article. 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 displacement guide means causes the base plate and the bottom plate to relatively vibrate in a parallel state and vibrates. Energy is absorbed by the braking means composed of the hydraulic damper. 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.

[0008]

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 of the bottom plate 1 via a movable connecting mechanism including four coil springs 9 and four hydraulic dampers 10. In this embodiment, a showcase 6 for displaying articles is integrally provided on the base plate 5.

The bottom plate 1 and the base plate 5 are rectangles of 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.

Coil springs 9 serving as the elastic support means are attached in a compressed state at four positions near the four corners of the rectangular bottom plate 1 and base plate 5. Each coil spring 9
Are mounted between a spring receiver 11 fixed to the lower surface of the base plate 5 and a spring receiver 12 fixed to the upper surface of the bottom plate 1.

As shown in FIG. 2, four hydraulic dampers 10 are provided.
Are arranged in pairs on both sides between the rectangular bottom plate 1 and the base plate 5. Further, as shown in FIG. 1, a set of two hydraulic dampers 10 is obliquely arranged between the bottom plate 1 and the base plate 5 so as to form an X shape. The lower end of the hydraulic damper 10 is rotatably coupled to the bracket 13 on the bottom plate 1 side about a horizontal axis, and the upper end of the hydraulic damper 10 is rotatable on a bracket 14 on the base plate 5 side about a horizontal axis. Are combined.

The hydraulic damper 10 is a direct-acting dashpot. As is well known, the piston rod 10b moves in and out of the cylinder 10a to expand and contract its entire length. The pot braking action works. As the distance between the bottom plate 1 and the base plate 5 increases or decreases, the hydraulic damper 10 expands and contracts to absorb the energy of the relative motion of the bottom plate 1 and the base plate 5 for braking.

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.

[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. 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 layout explanatory diagram of components corresponding to a cross section taken along the line AA in FIG.

[Explanation of symbols]

 1 Bottom plate 2 Casters 3 Floor 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 Spring bearing 13, 14 Bracket

Claims (1)

[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 supporting a load applied to the base plate by a plurality of coil springs arranged in a compressed state between the bottom plate and the base plate and appropriately maintaining a space between the bottom plate and the base plate, and both ends of the base plate. A vibration absorbing table, comprising: braking means for absorbing the kinetic energy of the vertical displacement of the base plate by a plurality of hydraulic dampers which are respectively coupled to the base plate and are obliquely arranged.