JP2000018324A - Base isolation device for exhibit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a small and inexpensive base isolation device for an exhibit which can relieve a big vibration. SOLUTION: This device is provided with a lower surface plate 21, an upper surface plate 22 arranged upward the lower surface plate 21, an intermediate plate 23 arranged between the lower surface plate 21 and upper surface plate 22, a guide rail 34 and roller 29 which can move the intermediate plate 23 provided between the lower surface plate 21 and upper surface plate 22 in one straight line direction for the lower surface plate 21, a guide rail 36 and roller 40 which can move the upper surface plate 22 provided between the intermediate plate 23 and upper surface plate 22 in the other straight line direction orthogonally crossing with the said one straight line direction for the intermediate plate 23 and restoration springs 32, 33, 42, 43 for returning the moved intermediate plate 23 and upper surface plate 22 to the position before moving.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a seismic isolation device for exhibits, which protects exhibits such as museums and art galleries from vibrations such as earthquakes.

[0002]

2. Description of the Related Art FIG. 8 is a perspective view of a conventional seismic isolation device using a linear guide rail, in which a plurality of lower linear guides are provided on an upper surface of a support 1 fixed on a foundation. The guide rails 2 are fixed in one linear direction.

A plurality of upper linear guide rails 4 are provided on the lower surface of a base-isolated object 3 such as a pedestal or an exhibition case on which an exhibit is placed, in another linear direction orthogonal to the lower linear guide rail 2. It is aligned and fixed.

A connecting block 5 is disposed between each of the lower linear guide rails 2 and the upper linear guide rail 4, and a lower portion of the connecting block 5 extends along the lower linear guide rail 2 via a ball. It is supported so that it can move smoothly, and the upper part of the connection block 5
The seismic isolation object 3 is supported together with the upper linear guide rail 4 via a ball so as to be able to move smoothly in the longitudinal direction of the upper linear guide rail 4.

As a result, the seismic isolation member 3 is supported so as to be able to move smoothly in all horizontal directions within the lengths of the lower linear guide rail 2 and the upper linear guide rail 4. Both ends of a plurality of coil-shaped restoring springs 6 arranged in parallel with the lower linear guide rail 2 and the upper linear guide rail 4 are connected to the upper surface of the support base 1 and the lower surface of the seismic isolation member 3, and are horizontal. The seismic isolation object 3 that has been moved to the position is returned to the position before the movement, so that horizontal vibration with respect to the seismic isolation object 3 is reduced and protected.

FIG. 9 is a longitudinal sectional view of another conventional seismic isolation device using a curved surface. A plurality of support blocks 9 are attached to the lower surface of a lower plate 7 by set screws 8. The lower plate 7 is fixed on a foundation (not shown) via a support block 9. A sphere support cap 10 is fixed to the upper surface of the lower plate 7, and a sphere 11 is rotatably supported on the upper portion thereof via a ball bearing.

Above the lower plate 7, an upper plate 12 is arranged, and on the upper plate 12, a pedestal or a display case on which a not-shown exhibit is mounted is attached.

A support plate 14 having a concave spherical curved surface 13 formed on the lower side is fixed to the lower surface of the upper surface plate 12, and the curved surface 13 is placed on the sphere 11. Supports the upper surface plate 12.

A bolt 15 is attached to the center of the lower surface of the upper plate 12, and the bolt 15 passes through a large-diameter hole 16 formed in the center of the lower plate 7, and a retaining plate 17 is attached to the lower end. A cover 18 is attached around the upper surface plate 12.

When the above-described seismic isolation device shown in FIG. 9 receives vibration such as an earthquake, the support plate 1 placed on the sphere 11
4, the top plate 12 can move smoothly in all horizontal directions, and the horizontal vibration against the top plate 12 is reduced by the restoring force due to the weight applied to the sphere 11 from the curved surface 13. Seismic isolation materials such as a pedestal or an exhibition case on which an exhibit is mounted are protected from vibration.

[0011]

In the conventional seismic isolation device shown in FIG. 8, in order to horizontally hold the seismic isolation object 3 supported on the lower linear guide rail 2, three or more connecting blocks 5 are provided. If a displacement of one-sided amplitude of 200 mm is required, 20
Since the lower linear guide rail 2 and the upper linear guide rail 4 each having 0 mm are required, there is a problem that the seismic isolation device cannot be downsized.

In the conventional seismic isolation device shown in FIG.
Without using the connecting block, the sphere 11 is sandwiched between the lower surface plate 7 and the upper surface plate 12 and the displacement amount can be obtained from the vertical displacement.
The curved surface 13 requires at least a radius of 200 mm or more, so that the seismic isolation device cannot be miniaturized, and there is a problem that it is very expensive and expensive to manufacture the support plate 14 having the curved surface 13. .

It is an object of the present invention to solve such a problem and to provide an inexpensive seismic isolation device for an exhibit which is small and can reduce large vibrations.

[0014]

According to a first aspect of the present invention, there is provided a lower plate attached to a foundation, an upper plate disposed above the lower plate and attached to a lower surface of a seismic isolation member, and the lower plate and the upper plate. An intermediate plate disposed between the lower plate and the intermediate plate, a guide rail and a roller provided between the lower plate and the intermediate plate to allow the intermediate plate to move in one linear direction with respect to the lower plate; A guide rail and a roller provided between the upper plate and the upper plate so as to move the upper plate in another linear direction orthogonal to the one linear direction with respect to the intermediate plate; A restoring spring to return to the position of
The top plate can be smoothly moved in any horizontal direction via the guide rails and rollers, and is returned to the position before the movement by the restoring spring. As a result, horizontal vibration is reduced, and the height of the entire device can be reduced to a small size.

According to a second aspect of the present invention, there is provided the exhibition according to the first aspect, further comprising damping means provided by magnets provided between the lower surface plate and the intermediate plate and between the intermediate plate and the upper surface plate. It relates to a seismic isolation device for goods, and it is possible to easily attenuate vibration displacement simply by using a magnet.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a plan view showing an embodiment of the present invention, FIG. 2 is a front view of FIG.
FIG. 3 is a side view of FIG. 1 as viewed from the III direction. As shown in FIG. 2 and FIG. 3, the display seismic isolation device of the present invention includes a lower plate 21 attached to a foundation 20 and a lower plate 21. An upper plate 22 is disposed above the base 21 and is attached to the lower surface of a base-isolated object such as a pedestal or an exhibition case (not shown), and is horizontally disposed between the lower plate 21 and the upper plate 22. The upper plate 22 is a substantially square flat plate as shown in FIG.
3. The lower plate 21 is also a square flat plate having the same dimensions. In FIG. 1, an intermediate plate 23 and an upper plate 22 of the same shape are overlaid on the lower plate 21 at intervals. Has become.

FIG. 4 is a plan view showing an example of the embodiment of the lower plate 21. FIG.
As shown in FIG. 4, a connecting block 24 is attached, and a stopper 25 to which a cushion rubber is attached is attached above and below in FIG.

Further, in the vicinity of the upper edge and the lower edge in FIG. 4 of the upper surface of the lower plate 21, the upper surface in the left-right direction of FIG. 4, and in FIG. A roller guide rail 27 having a concave groove 26 is attached to the roller guide rail 27, and a roller stop plate 28 is fixed to both ends of the roller guide rail 27. Roller guide rail 27
As shown in FIGS. 2 and 3, a roller 29 is fitted into the concave groove 26, and rolls along the concave groove 26.

As shown in the front view of FIG. 2 and the plan view of FIG. 5, the roller 29 is formed by combining two rollers 29 so that their axes are parallel by a connecting plate 30 to form a roller unit 31. I have.

As shown in FIG. 4, restoring springs 32, 33 of coil springs are disposed at positions along the roller guide rail 27 on the upper surface of the lower plate 21.
3 is closed near the edge of the upper surface of the lower plate 21, and the inner ends of the restoring springs 32 and 33 are on the center line of the lower surface of the intermediate plate 23 as shown in FIGS. It has been stopped.

The connecting block 24 attached to the center of the upper surface of the lower plate 21 has an X-direction guide rail 34 fixed to the lower surface of the intermediate plate 23 in the X direction, as shown in FIGS. , So that it can be moved smoothly in the longitudinal direction via a ball.

The above-described X-direction guide rail 34 is fixed to the lower surface of the intermediate plate 23, and a concave groove 26 (FIG. 2) is formed on the lower surface so as to face the roller guide rail 27 on the upper surface of the lower plate 21. , FIG. 3) is attached in the X direction, and a roller stop plate 28 is fixed to both ends of the roller guide rail 27.

The concave groove 26 of the roller guide rail 27 attached to the lower surface of the intermediate plate 23 is fitted from above into the roller 29 as shown in FIGS. It is guided by the X-direction guide rail 34 and can move smoothly in the X direction with respect to the lower surface plate 21.

When the intermediate plate 23 is moved in the X direction with respect to the lower plate 21, as shown in FIG. 1 and FIG. , A stopper 35 to which a cushioning rubber is attached is attached so as to face the stopper 25 on the upper surface of the lower plate 21.

In the center of the upper surface of the intermediate plate 23, the vertical direction in FIG. 1 and the vertical direction in FIG.
That. ), A Y-direction guide rail 36 is fixed, and a roller guide rail 38 having a concave groove 37 on the upper surface is attached near the Y-direction edge of the upper surface of the intermediate plate 23. At both ends, Figure 3
The roller stop plate 39 is fixed as shown in FIG. The roller 40 (see FIGS. 1 to 3) of the roller unit 31 (see FIG. 1) similar to the roller 29 described in FIG. 5 is fitted into the concave groove 37 of the roller guide rail 38, and the concave groove 37 is provided.
It rolls along.

As shown in FIGS. 1 and 2, a stopper 4 with a cushion rubber attached thereto is provided near the X-direction edge of the upper surface of the intermediate plate 23.
1 are installed facing each other.

Roller guide rail 38 on the upper surface of the intermediate plate 23
1 and 2, restoring springs 42 and 43 of coil springs are provided at positions along
The outer ends of the springs 2 and 43 are closed near the X-direction edge of the upper surface of the intermediate plate 23, and the inner ends of the restoring springs 42 and 43 are stopped on the X-direction center line of the lower surface of the upper plate 22. I have.

As shown in FIGS. 1 and 2, a connecting block 44 is attached to the center of the lower surface of the upper plate 22. The connecting block 44 is fixed in the Y direction on the upper surface of the intermediate plate 23. The Y-direction guide rail 36 is sandwiched via balls so as to be able to move smoothly in the longitudinal direction of the guide rail 36.

On the lower surface of the upper plate 22, the above-mentioned intermediate plate 23 is provided.
A roller guide rail 38 having a concave groove 37 (see FIGS. 2 and 3) on the lower surface is attached in the Y direction so as to face the roller guide rail 38 on the upper surface. As shown in FIG. 3, a roller stop plate 39 is fixed.

The groove 37 of the roller guide rail 38 attached to the lower surface of the upper plate 22 is fitted into the roller 40 from above as shown in FIGS. It is guided by the Y-direction guide rail 36 and can move smoothly in the Y direction with respect to the intermediate plate 23.

When the upper plate 22 moves in the Y direction with respect to the intermediate plate 23, as shown in FIGS. 1 and 2, the center of the lower surface of the upper plate 22 in the X direction is prevented from falling off the intermediate plate 23. On the line, a stopper 45 to which buffer rubber is attached is attached so as to be located between the stoppers 41 on the upper surface of the intermediate plate 23.

As shown in FIG. 1 and FIG. 3, a magnet 46 is attached to the lower surface of the intermediate plate 23 as shown in FIGS. As shown in FIGS. 1 and 2, a magnet 48 is also provided on the upper surface of the intermediate plate 23 as a damping means toward the upper surface plate 22.
Attached via an adjustable length rod 49.

In order to operate the magnets 46 and 48 as damping means against the movement displacement, a non-magnetic plate is attached to the upper surface of the lower plate 21 so as to face the magnet 46, and the upper plate 22 is made to face the magnet 48. A non-magnetic plate is also attached to the lower surface, or the lower plate 21 and the upper plate 22 themselves are made of a non-magnetic plate so that when a displacement occurs, the displacement is attenuated by the generation of an eddy current.

Next, the operation of the seismic isolation device for exhibits shown in FIGS.

Even if the lower plate 21 is displaced in any of the horizontal directions due to the horizontal vibration, the upper plate 22 and the base or the display case on which the exhibit mounted thereon are seismically isolated. Objects attempt to hold their position due to inertia.

FIG. 6 is a plan view when the lower plate 21 is vibrated in the direction of 45 degrees with respect to the X and Y directions.
6 is a front view of FIG. 6 as viewed from the direction VII. In this case, the lower plate 21 is an intermediate plate 23 and an upper plate 22.
, And the intermediate plate 23 and the lower surface plate 21 are displaced in the Y direction with respect to the upper surface plate 22.

When the lower plate 21 is displaced in the X direction with respect to the intermediate plate 23, the connecting block 24 attached to the center of the upper surface of the lower plate 21 is fixed to the X direction guide fixed on the lower surface of the intermediate plate 23 in the X direction. The roller guide rail 2 moves smoothly in the X direction with respect to the rail 34 and
7 rotates the roller 29 and moves in the X direction. Then, as shown in FIG. 7, the restoring spring 32 contracts, and the restoring spring 33 expands to generate a restoring force, and a damping force by the magnet 46 is generated. Even if the displacement of the lower plate 21 in the X direction is large, the stopper 35 contacts the stopper 25 and the roller 29
Is brought into contact with the roller stop plate 28 so that the intermediate plate 23
Is prevented from falling off from the lower plate 21.

The lower plate 21 is vibrated and displaced in a direction of 45 degrees with respect to the X and Y directions, and the intermediate plate 23 is moved to the upper plate 2.
2, the Y-direction guide rail 36 fixed in the Y direction on the upper surface of the intermediate plate 23 moves in the Y direction with respect to the connecting block 44 fixed in the center of the lower surface of the upper plate 22. The roller guide rail 38 on the upper surface of the intermediate plate 23 moves in the Y direction by rotating the roller 40.

The restoring spring 42 contracts, and the restoring spring 43
Is extended to generate a restoring force, and a damping force by the magnet 48 is generated. Also, even if the displacement of the intermediate plate 23 in the Y direction is large,
The stopper 41 comes into contact with the stopper 45 and the roller 40 comes into contact with the roller stop plate 39, so that the upper plate 22 is prevented from being displaced from the intermediate plate 23 and falling.

The damping force by the magnets 46, 48 can be adjusted by expanding and contracting the rods 47, 49 whose lengths can be adjusted, and changing the gaps between the lower plates 21, 22 and the magnets 46, 48. it can.

[0042]

According to the first aspect of the present invention, since a compact and low-height device can be manufactured, it can be mounted even in a narrow space in an exhibition case, and a large displacement can be obtained.
Seismically isolated objects such as museums, museums, and other exhibits are kept horizontal against vibration, effectively seismically isolated, and a minimum number of expensive guide rails can be configured using rollers. There is an effect that the total cost can be reduced.

According to the second aspect of the present invention, the use of an inexpensive magnet has the effect of promptly attenuating and stabilizing the vibration displacement.

[Brief description of the drawings]

FIG. 1 is a plan view showing an example of an embodiment of the present invention.

FIG. 2 is a front view of FIG. 1 viewed from a direction II.

FIG. 3 is a side view of FIG. 1 as viewed from a direction III.

FIG. 4 is a plan view showing an example of an embodiment of a lower plate used in the present invention.

FIG. 5 is a plan view showing an example of an embodiment of a roller used in the present invention.

FIG. 6 is a plan view showing an example of an operation state of the present invention.

FIG. 7 is a front view of FIG. 6 as viewed from the direction VII.

FIG. 8 is a perspective view of a conventional seismic isolation device using a linear guide rail.

FIG. 9 is a longitudinal sectional view of another conventional seismic isolation device using a curved surface.

[Description of Signs] 21 Lower surface plate 22 Upper surface plate 23 Intermediate plate 29 Roller 32, 33 Restoring spring 34 X-direction guide rail 36 Y-direction guide rail 40 Roller 42, 43 Restoring spring 46, 48 Magnet

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[Procedure amendment]

[Submission date] May 17, 1999 (1999.5.1
7)

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Claims

[Correction method] Change

[Correction contents]

[Claims]

[Procedure amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0014

[Correction method] Change

[Correction contents]

According to the present invention, there is provided a lower plate mounted on a foundation, an upper plate disposed above the lower plate and mounted on a lower surface of a seismic isolation object, and an intermediate plate disposed between the lower plate and the upper plate. Origin return between each plate
-Shaped seismic isolation device provided with elastic return means and damping means
In one, a central portion between the lower plate and the intermediate plate
Linear guide rail, and parallel to the linear guide rail
That at both ends, and the guide rails and rollers to be movable in one linear direction, centrally between the intermediate plate and the upper plate
Part, one linear guide rail and the linear guide
Both ends parallel to the rail can be moved in one linear direction
Guide rails and rollers, and
Linear guide rails and guides located above and below
This is a seismic isolation device for exhibits, characterized in that rails and rollers are orthogonal to each other . The top plate can move smoothly in any horizontal direction through the guide rails and rollers, and can be moved by elastic return means . By returning to the previous position, the horizontal vibration is reduced, and the height of the entire device can be reduced to a small size.

[Procedure amendment 3]

[Document name to be amended] Statement

[Correction target item name] 0015

[Correction method] Deleted

Claims (2)

[Claims] 1. A lower plate attached to a foundation, an upper plate disposed above the lower plate and attached to a lower surface of a seismic isolation member, and an intermediate plate disposed between the lower plate and the upper plate. A guide rail and a roller provided between the lower surface plate and the intermediate plate and capable of moving the intermediate plate in one linear direction with respect to the lower surface plate; and an upper surface plate provided between the intermediate plate and the upper surface plate. A guide rail and a roller that can move in the other linear direction perpendicular to the one linear direction with respect to the intermediate plate; and a restoring spring that returns the moved intermediate plate and the upper surface plate to positions before the movement. A seismic isolation device for exhibits, characterized in that: 2. The seismic isolation device for exhibits according to claim 1, further comprising a magnet damping means provided between the lower plate and the intermediate plate and between the intermediate plate and the upper plate. .