JPH0925997A - Vibration absorbing table - Google Patents

Abstract

PROBLEM TO BE SOLVED: To protect articles placed on a vibration absorbing table from vibration even when the floor of a building is violently vibrated vertically due to earthquake, etc., by allowing a base plate and a bottom plate to be relafively vibrated in state where they are kept in parallel by a displacement guide means, and absorbing the vibrational energy of the base plate and the bottom plate by a damping means consisting of hydraulic dampers. SOLUTION: When precision apparatuses or industrial art handcrafts are arranged in the showcase 6 on a base plate 5, respective coil springs are compressed by their weight in order for the base plate 5 to be lowered while it is kept horizontal. Further, when the floor 3 of a building in which a vibration absorbing table is placed, is violently vibrated vertically due to earthquake, etc., the base plate 5 and a bottom plate 1 are relatively vibrated in state where they are kept in parallel, by a displacement guide means consisting of parallel link mechanisms 7, and their vibrational energy is absorbed by a damping means composed of respective hydraulic dampers. As a result, even when the bottom plate 1 is violently vibrated vertically together with the floor 3, vertical vibration of the base plate 5 is suppressed to become extremely small. Thus, the exhibited articles in the showcase 6 are protected from vibration.

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 table of the present invention, a base plate is horizontally mounted on a horizontally installed bottom plate through a movable connecting mechanism, and the movable connecting mechanism comprises: 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 the base plate being horizontal. Displacement guide means for allowing vertical displacement as it is, and braking means for absorbing kinetic energy of vertical displacement of the base plate by hydraulic dampers having opposite ends coupled to the bottom plate and the base plate, respectively. further,
One end of the first arm is rotatably coupled to the base plate by a horizontal first shaft, and one end of the second arm is horizontal to the bottom plate.
The other ends of the first arm and the second arm are rotatably axially coupled to each other, and one end of the third arm is parallel to the base plate at a predetermined distance from the base plate. A third shaft is rotatably coupled, and one end of a fourth arm is rotatably coupled to the bottom plate by a fourth shaft parallel to the second shaft at a predetermined interval. The other ends are rotatably axially coupled, and the connection point of the first arm / second arm and the connection point of the third arm / fourth arm are connected by a horizontal connection rod, so that the first arm and the third arm are connected. A parallel link mechanism in which the arms are parallel to each other and the second arm and the fourth arm are parallel to each other is configured, and the displacement guide means is realized by the parallel link mechanisms having a plurality of different directions.

When an article is placed on the base plate, the base plate is slightly lowered while being horizontal by the displacement guide means composed of the parallel link mechanism, and the weight of the article is supported by the elastic support means composed of the coil spring. . Although the bottom plate is placed on the floor of the building, when the floor violently vibrates vertically due to an earthquake or the like, the base plate and the bottom plate are relatively vibrated by the displacement guide means while relatively vibrating,
The vibration energy is absorbed by the braking means including 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]

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 and four sets of parallel link mechanisms 7. In this embodiment, a showcase 6 for displaying articles is integrally provided on the base plate 5. The above-mentioned movable connecting mechanism is composed of four couplers 4 and four sets of parallel link mechanisms 7, and the elastic supporting means, displacement guide means, and braking means described above are realized as follows.

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 rotatably attached to the bracket 13 fixed to the lower surface of the base plate 5 about 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).

The detailed construction of the parallel link mechanism 7 is shown in FIG. One end of the first arm 71 is horizontal to the base plate 5
The second arm 72 is rotatably connected, and one end of the second arm 72 is rotatably connected to the bottom plate 1 by a horizontal second shaft b, and the other ends of the first arm 71 and the second arm 72 are rotated. The third arm 73 is freely coupled by an intermediate shaft c, and one end of the third arm 73 is rotatably coupled to the base plate 5 by a third shaft d parallel to the first shaft a at a predetermined interval. Is rotatably coupled to the bottom plate 1 by a fourth shaft e parallel to the second shaft b at a predetermined interval, and the other ends of the third arm 73 and the fourth arm 74 are rotatably connected by an intermediate shaft f. The connecting point c of the first arm / second arm and the connecting point of the third arm / fourth arm f are connected by a horizontal connecting rod 75, and the first arm 71 and the third arm 73 are parallel to each other. The parallel link mechanism 7 in which the second arm 72 and the fourth arm 74 are parallel to each other is configured. When the bottom plate 1 and the base plate 5 are viewed two-dimensionally, four sets of parallel link mechanisms 7 are arranged so as to form a quadrangle. This realizes the displacement guide means.

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 up and down due to an earthquake or the like, the base plate 5 and the bottom plate 1 are kept relatively parallel by the displacement guide means including the parallel link mechanism 7. And the vibration energy is absorbed by the braking means including the hydraulic dampers 10. As a result, the bottom plate 1
Even if the floor vibrates violently with the floor 3, the vertical 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 table of the present invention, when an article is placed on the base plate, the base plate is slightly lowered while being horizontal by the displacement guide means composed of the parallel link mechanism, and the coil spring is moved. The weight of the article is supported by the elastic support means. 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 with the floor,
Vertical vibrations of the base plate are suppressed and become 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 perspective view of a parallel link mechanism 7 according to the embodiment.

[Explanation of symbols]

 1 Bottom plate 2 Casters 3 Floor 4 Combiner 5 Base plate 6 Showcase 7 Parallel link mechanism 9 Coil spring 10 Hydraulic damper 10a Cylinder 10b Piston rod 11, 12 Base plate 13, 14 Bracket 71-74 1st-4th link 75 Connecting rod

Claims (1)

[Claims] 1. A base plate is horizontally mounted on a horizontally installed bottom plate through a movable connecting mechanism, and the movable connecting mechanism is arranged in a compressed state between the bottom plate and the base plate. Elastic support means for supporting a load applied to the base plate by a plurality of coil springs and appropriately maintaining a distance between the bottom plate and the base plate; and displacement guide means for allowing the base plate to be vertically displaced while being horizontal. , A braking means for absorbing kinetic energy of vertical displacement of the base plate by hydraulic dampers, both ends of which are respectively connected to the bottom plate and the base plate, and one end of the first arm is horizontal to the base plate. Is rotatably coupled to the second plate with one end of the second arm being horizontal to the bottom plate.
The first arm and the second arm are pivotally coupled to each other at their other ends, and one end of the third arm is parallel to the base plate at a predetermined distance from the base plate. The third arm is rotatably connected, and one end of the fourth arm is rotatably connected to the bottom plate by a fourth shaft parallel to the second shaft at a predetermined interval. The other ends are rotatably axially coupled, and the connection point of the first arm / second arm and the connection point of the third arm / fourth arm are connected by a horizontal connection rod, so that the first arm and the third arm are connected. A vibration absorbing table, wherein a parallel link mechanism having parallel arms and parallel second arm and fourth arm is configured, and the displacement guide means is realized by the parallel link mechanisms having a plurality of different directions.