JP2000291729A - Base isolation device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To minimize a device and prevent the impairing of the base isolation characteristic caused by the attachment of dust and the like by connecting a connecting member between the plates to be coated movably in the vertical direction or the lateral direction. SOLUTION: A base isolation device consists of the bases 1, 2 with an upper and lower pair of arm-shaped supports, a ball 3 rollingly held between the upper and lower supports 10, 20, the coated pieces 4, 5 mounted on the bases 1, 2 while surrounding the upper and lower bases 10, 20, and a connecting member 6 connecting the upper and lower coated pieces 4, 5. The coated pieces 4, 5 are fastened to the circumference of the bases 1, 2 by the bolts 7 in a state that they are opposite to a floor F and a storage M with the bases 1, 2. The upper and lower coated pieces 4, 5 are provided with the long slots, and the connecting member 6 such as a chain and a ring are inserted into the slots. As the connecting member 6 is inserted into the slots, more than the predetermined displacement in the lateral direction and the vertical direction of one base 2 is regulated by the connecting member 6.

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 a precision machine installed in a building.

[0002]

2. Description of the Related Art A conventional seismic isolation device for a building is intended to reduce the response acceleration of the building during an earthquake, in which support members having concave curved surfaces are arranged on the foundation side and the building side so as to face each other. There is disclosed an apparatus in which a roller and a ball are interposed between upper and lower supports and seismically isolated by damping due to rolling of the roller and the ball during an earthquake.

Further, a roller is provided between upper and lower concave curved surfaces facing each other,
In order to prevent horizontal displacement and vertical displacement of the building beyond a predetermined level by interposing a ball, the building or the foundation side is connected with a connecting member such as a chain with flexibility. 142239).

[0004]

The above-described seismic isolation device using rolling rollers and balls has a simpler structure than a conventional seismic isolation device comprising a laminated rubber, a damper, a linear guide, a coil spring, etc. If dirt, dust and the like adhere to the concave curved surface of the support, the rolling properties of the rollers and balls are impaired.

Therefore, it is difficult to apply a building to a seismic isolation device such as a lightweight precision machine.

In addition, since the connecting member is directly connected to the building and the foundation, the seismic isolation device has poor mounting properties, cannot be made compact, and is difficult to apply to the seismic isolation device such as the precision machine. Was.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a seismic isolation device using rolling members such as rollers and balls so that the device is compact and the seismic isolation is not impaired by adhesion of dust and dust. I do.

[0008]

A seismic isolation device according to the present invention for achieving the above object is mounted on an installation floor on one side and on a body placed on the installation floor on the other side, with concave curved surfaces facing each other. A pair of upper and lower bases with a bowl-shaped support, a ball rotatably held between the supports in the upper and lower bases, and a cover piece that needs to be coated on the base around each of the supports; And a connecting member connected between the upper and lower covering pieces so as to be movable in the up-down direction or the left-right direction.

Due to the covering pieces surrounding the upper and lower supports, dust and dirt do not enter the rolling surface of the ball on the support.

Also, since the connecting member is connected to the upper and lower covering pieces, the connecting member can be connected to the covering piece in advance. Therefore, the seismic isolation device with the connecting member can be set, and the mountability to the seismic isolation member is improved.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. The seismic isolation device according to the present invention is used for a precision machine installed in a building. In the figure, (F) is the floor of the building, (M) is a storage for storing the precision machine itself or the precision machine, and is mounted. The mounting table is shown.

[0012] The seismic isolation device according to the present invention is attached to four corners of the bottom of the precision machine, such as the bottom storage and the installation table.

The seismic isolation device comprises a pair of upper and lower bases with bowl-shaped supports (1) and (2), and a ball (3) rotatably held between the upper and lower supports (10) and (20). Covering pieces (4) and (5) attached to the bases (1) and (2) so as to surround the upper and lower supports (10) and (20), and upper and lower covering pieces (4) and (5)
And a connecting member (6) for connecting.

As shown in FIG. 4, the bases (1) and (2) are disc-shaped, and a substantially bowl-shaped support (10) (20) having a concave curved surface in the center on one side is integrally formed of a slide made of polyacetal or the like. It is molded with a hard synthetic resin having properties. In the figure, (11) and (21) are edges of the supports (10) and (20),
(12) and (22) indicate fastening portions of the bases (1) and (2).

It is preferable that the radius (curvature) of the concave curved surface of each of the supports (10) and (20) is about 150 mm when the diameter of the ball (3) is 38 mm.

The concave surfaces of the supports (10) and (20) are preferably covered with a chrome-plated stainless steel cap (not shown). (17) in the figure ...
Indicates base mounting holes opened at four locations in the fastening portions of the bases (1) and (2).

The ball (3) is a steel ball for a ball bearing made of stainless steel, is accommodated in the support (10), is sandwiched between the upper and lower supports (10) and (20), and rolls when an earthquake occurs. It is configured to be.

As shown in FIGS. 1 to 3, the coating pieces (4) and (5) are made of stainless steel having an annular L-shaped cross section.
Bolts (7) are fastened around the bases (1) and (2) together with the bases (1) and (2) so as to face the floor (F) and the storage (M), respectively. (7A) in the figure shows a washer.

The upper and lower coating pieces (4) and (5) have vertically long slots (40A) and (50A), respectively. A connecting member (6) such as a chain, a ring,...

The connecting member (6) is also formed of stainless steel similarly to the covering pieces (4) and (5), and is inserted into the long holes (40A) and (50A) with some clearance.

Therefore, one base (2) at the time of the earthquake
The displacement of more than a predetermined amount in the left-right direction and the up-down direction is restricted by the connecting member (6).

The upper and lower bases (1) and (2), the supports (10) and (20), and the covering pieces (4) and (5) are attached as shown in the drawing, and the upper and lower covering pieces (4) are provided. (5) is connected by four connecting pieces (6).

The covering pieces (4) and (5) are composed of bases (1) and (2)
May be integrally formed with the base (1) as shown in the figure.
(2) Separately attached directly to the floor (F) and the storage (M) side with bolts (7) together with the bases (1) and (2) separately from the base (1) and (2), so that it can be attached to the floor (F) during an earthquake The condition becomes good.

Thus, the seismic isolation device according to the present invention is configured as described above, so that horizontal and vertical forces act during an earthquake, but the upper and lower supports (10), (20) While supporting the vertical load by the ball (3), which is rolled between the balls (3), the ball smoothly moves along the concave curved surface, and the restoring force against horizontal and vertical displacements works to exert the seismic isolation function. .

When a horizontal displacement or a vertical (vertical) displacement exceeding a predetermined value occurs due to an earthquake, the horizontal displacement or the vertical displacement is regulated to a certain value or less by the connecting member (6).

[0026]

According to the present invention, since the bowl-shaped supports provided on the upper and lower bases are surrounded by the covering pieces, dirt, dust and the like are formed on the concave curved surface of the supports on which the balls roll during an earthquake. Does not enter. Therefore, the rolling properties of the ball are not impaired, and seismic isolation can be maintained for a long time.

Also, since it is composed of a pair of upper and lower bases with a support and a cover piece, the moldability of the component parts is good,
In addition, the structure is simple and compact, and it is ideal as a seismic isolation device for precision machinery.

[Brief description of the drawings]

FIG. 1 is a sectional view of a seismic isolation device according to the present invention.

FIG. 2 is a sectional view taken along line II-II of FIG.

FIG. 3 is an enlarged view of a portion A in FIG. 1;

FIG. 4 is a perspective view of a base with a support used in the present invention.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 base 2 base 3 ball 4 covering piece 5 covering piece 6 connecting material 10 support 20 support

Claims (3)

[Claims] 1. A pair of upper and lower bowl-shaped support-supported bases, one of which is mounted on an installation floor and the other of which is mounted on an installation floor with concave curved surfaces facing each other. Ball to be clamped Covering piece required to cover the support fixed to the base around each of the supports The seismic isolation device consisting of a connecting material connected between the upper and lower coating pieces so as to be movable in the vertical and horizontal directions. . 2. The seismic isolation device according to claim 1, wherein the connecting member is movably connected to long holes provided in upper and lower covering pieces. 3. The seismic isolation device according to claim 1, wherein the base is made of a hard synthetic resin and is integrally formed with a bowl-shaped support.