JP3441034B2 - Seismic isolation device - Google Patents

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 that blocks vibration energy such as an earthquake to prevent damage to an installation body.

[0002]

2. Description of the Related Art If an installation body such as a shelf installed on the floor falls due to a vibration such as an earthquake, it may cause personal injury or damage.
The items housed inside the installation body may be damaged. Therefore, it has been performed to fix the installation body to a wall by using earthquake-resistant metal fittings, or to provide the installation body or the building itself with a sturdy structure to have earthquake resistance.

However, even with the above structure, in the event of a severe earthquake, stress concentrates on any part of the seismic resistant fitting, the installation body or the building, causing deformation or damage, and the reliability of seismic resistance is increased every time an earthquake occurs. Sex is reduced.

Therefore, the movable floor is movably supported in a movable floor provided between the floor and the installation body and in a plane parallel to the floor provided between the floor and the movable floor. A seismic isolation device that has an intervening member and absorbs vibration energy such as an earthquake is proposed in Japanese Utility Model Publication No. 4-13846.

This seismic isolation device is also used in museums and art galleries, in which case an exhibit is placed on the upper surface of a movable floor. At this time, if the seismic isolation device is exposed, the aesthetic appearance is impaired. Therefore, the seismic isolation device used in such a place is mainly covered with a cover.

[0006]

In the seismic isolation device, the movable floor moves according to the vibration energy.
Since it is necessary to cover the seismic isolation device even during this movement,
There is a problem that the cover must be formed in a size that includes the moving allowance of the movable floor, which increases the installation space for the seismic isolation device.

An object of the present invention is to solve the above problems and to provide a seismic isolation device which does not take up a large installation space and does not spoil the appearance.

[0008]

The invention according to claim 1 is
A seismic isolation device, which is disposed between a floor surface and an installation body and blocks vibration energy transmitted from the floor surface side, wherein the fixed base placed on the floor surface has substantially the same size as the fixed base. It
And the installation body, which is arranged to face the fixed base, is mounted.
A movable base placed on the movable base, an urging means arranged below the movable base between the fixed base and the movable base, for returning the movable base after the movement to the position before the movement, the movable base or At least the side surface of the fixing base located on the front surface is covered.
And a cover that opens as the movable table moves .

According to a second aspect of the present invention, in the seismic isolation apparatus according to the first aspect, the cover further comprises the vibration energy.
When the luge does not reach the specified value, it is separated from the movable table.
Without restricting the movement of the movable table with respect to the fixed table,
When the vibration energy reaches a predetermined value, the movable
Move away from the fixed table by moving the movable table relative to the fixed table.
Characterized by allowing .

According to a third aspect of the present invention, in the seismic isolation device according to the first or second aspect, the cover is further provided.
A plurality of adjacent covers are provided.
The mating ends are releasably fixed to each other,
When the ghee does not reach the predetermined value, the multiple covers
Movement of the movable table relative to the fixed table without separating from each other
When the vibration energy reaches a specified value,
Is characterized in that the plurality of covers are separated from each other to allow movement of the movable table with respect to the fixed table.

[0011]

[0012]

1 is a perspective view showing a seismic isolation device adopting a first embodiment of the present invention. In the figure, seismic isolation device 1
Has a lower frame 2 as a fixed base, an upper frame 3 as a movable base, and a cover 21. As shown in FIG. 2, the lower frame 2 is mainly composed of a frame body 4, a reinforcing member 5, a flat plate 6, an upper frame fixing means (not shown) and the like.

The frame body 4 is formed in a substantially square shape by connecting a plurality of square pipes 7 by welding. A total of four flat plates 6 are arranged at the four corners of the frame body 4, and a reinforcing member 5 made of a channel material or the like is arranged in the space between the flat plates. Further, mounting pieces 19 for mounting a tension spring 20 described later are fixed to two corner portions on one diagonal line of the frame body 4 by screwing or welding.

The reinforcing member 5 is fixed to the frame body 4 by welding or the like, and an upper frame fixing member (not shown) having an operation piece which is composed of a motor, a cylinder and the like, and is engageable with a stopper described later on the upper surface thereof. Means are fixed. The upper frame fixing means (not shown) is connected to a seismic sensing device (not shown), and has a well-known structure that receives a signal from the seismic sensing device to actuate the operating piece.

As shown in FIG. 3, the flat plate 6 constituting the supporting means is a square plate member 8 made of a hardened and polished steel plate having a high hardness and a high flatness, and an elastic body such as rubber or urethane. And a regulating member 9 consisting of.

The plate member 8 has holes 8a at four corners on its diagonal.
Are formed, and counterbored holes 8b are formed on the diagonals located inside each hole 8a. Further, taps 8c and 8c are formed at positions facing each other across the diagonal line from the position where each countersunk hole 8b is formed.

A regulating member 9 having the same outer shape as the plate member 8.
Has an octagonal perforated portion 9a in the center thereof and is adhered to the upper surface of the plate member 8. The perforated portion 9a is provided with each countersunk hole 8b when the regulating member 9 is bonded onto the plate member 8.
And each tap 8c are formed to be exposed. Further, four through holes 9b that are slightly larger than the holes 8a are formed at the four corners of the regulating member 9 and at the positions corresponding to the positions where the holes 8a of the plate member 8 are formed. .

Four ribs 10 each having a triangular shape and fixed to a square pipe 7 by welding or the like are provided at a mounting portion of the plane plate 6 of the frame body 4. Each of the ribs 10 is formed with four taps 10a formed at positions corresponding to the counterbored holes 8b when the flat plate 6 is placed on the ribs 10, and at positions corresponding to the holes 8a. And four taps 10b are formed respectively.

As shown in FIG. 4, the upper frame 3 includes a frame body 14,
It is mainly composed of a reinforcing member 15, a ball bearing 16 having a ball 16a which is a sphere, a stopper (not shown) and the like.

The frame body 14 is constructed to have a substantially same outer shape as the frame body 4 by connecting a plurality of square pipes 17 by welding. The flat plate 6 is provided at the four corners of the frame body 14.
4 ball bearings 16 each corresponding to
Individually arranged. A ball bearing 16 that rotatably supports a ball 16a on its upper surface and constitutes a supporting means together with the flat plate 6 is fixed to a mounting member 18 made of a channel material or the like welded between the square pipes 17 by screwing or the like. It is fixed. At the time of this attachment, each ball bearing 16 is arranged so that the apex of each ball 16a protrudes from the upper surface of the frame body 14 to a predetermined height (a position exceeding the height of the upper frame fixing means (not shown)) or more, and The vertices of each ball 16a are attached so as to form the same plane. Further, mounting pieces 19 for mounting a tension spring 20 described later are fixed to two corner portions on one diagonal line of the frame body 14 by screwing, welding or the like.

A reinforcing material 15 made of a channel material or the like is arranged in the space between the mounting positions of the mounting members. Reinforcement material 1
The numeral 5 is fixed to the frame body 4 by welding or the like, and a stopper (not shown) that engages with the operating piece of the upper frame fixing means (not shown) is fixed to the upper surface thereof.

As shown in FIG. 5, the cover 2 is made of a steel plate material or a resin material whose outer surface is painted or decorated.
Four bases 1 are attached to the frame body 4 of the lower frame 2 by hinges 22 to cover the four side surfaces of the lower frame 2 and the upper frame 3, respectively. The cover 21 has a magnet 21a that extends over substantially the entire width of the cover 21 near the free end thereof. When the seismic isolation device 1 is inoperative, the operating piece of the upper frame fixing means (not shown) is engaged with the stopper (not shown). In the figure, the magnet 21a is magnetically attached to the frame body 14 of the upper frame 3 and is placed at the solid line position in the figure.

Assembly and adjustment of the seismic isolation device 1 having the above-described structure will be described below. First, with reference to FIG. 3, the attaching operation of the plane plate 6 and the horizontal level adjusting operation will be described. The plane plate 6 is attached to the frame body 4 by fastening means such as bolts.

The first flat plate 6 is attached to the four ribs 1 of the frame body 4.
0, and the set screw 11 is screwed into each tap 8c. After that, a level adjusting device such as a spirit level is placed on the plate member 8, and each set screw 11 is screwed in, and the tip end thereof is brought into contact with each rib 10 to adjust the level of the plate member 8. Then, when the level of the plate member 8 becomes appropriate, the flat plate 6 is fixed to the frame body 4 by screwing the bolts 12 into the taps 10a through the counterbore holes 8b.

After the first plane plate 6 is fixed to the frame body 4, the frame body 4 diagonally located from the first plane plate 6 is placed on the frame body 2.
The second flat plate 6 is attached in the same procedure as described above. At this time, level adjustment is performed so that the plate member 8 of the second flat plate 6 is located in the same plane as the plate member 8 of the first flat plate 6. After that, similarly, the third flat plate 6 and the fourth flat plate 6 are attached to the frame body 4.

As described above, since each of the flat plates 6 can create a horizontal plane with the floor surface, the lower frame 2 adapts to whatever floor surface is placed. be able to. Further, since the individual flat plates are independent, the replacement work of the flat plate 6 due to abrasion or the like can be easily performed.

When four plane plates 6 forming the same plane are attached to the frame body 4, the level adjustment of the frame body 4 and each plane plate 6, that is, the lower frame 2 is performed.

The lower frame 2 has four flat plates 6 for each flat plate 6.
A total of 16 adjusters 13 are attached. Adjuster 13 including screw portion 13a and leg portion 13b
Has a threaded portion 13a screwed into the tap 10b from below. Each adjuster 13 is attached such that the head portion of the screw portion 13a is located at a position in the through hole 9b that does not project from the upper surface of the regulation member 9.

When the adjuster 13 is attached to the lower frame 2, the level adjusting device is placed on the lower frame 2 with each leg 13b being grounded to the floor, and the screw portion 13a is turned by a screwdriver to rotate the lower frame. Adjust the level for the 2nd floor. After the horizontal level adjustment of the lower frame 2 with respect to the floor is completed, the upper frame 3 is attached to the lower frame 2.

FIG. 6 is a diagram schematically showing a mounting state of the lower frame 2 and the upper frame 3. The upper frame 3 is placed on the lower frame 2 so that the diagonal line having the actuating piece 19 coincides with the diagonal line of the lower frame 2 having no operating piece 19. In a state where the upper frame 3 is placed on the lower frame 2, the balls 16a of the four ball bearings 16 mounted on the upper frame 3 are attached to the lower frame 2 and the plate members 8 of the four flat plates 6 are attached. And the upper frame 3 is movably supported by the lower frame 2 in all directions.

Next, a tension spring 20 as a biasing means is attached to each of the mounting pieces 19 attached to the lower frame 2 and the upper frame 3 two by two.
Attach A, 20B, 20C and 20D respectively. The four extension springs 20A, 20B, 20C and 20D having the same shape and the same spring constant have one end on the mounting piece 19 provided on the lower frame 2 and the other end on the upper side. The tension springs 20A, 20B, 20C, and 20D, which are respectively attached to the attachment pieces 19 provided on the frame 2, are stretched while being preloaded.

With the above structure, the upper frame 3 is movably attached to the lower frame 2 in all directions, and each tension spring 20
It is held at the initial position (the position where each ball 16a contacts the center of each plate member 8) by the urging force of A, 20B, 20C, 20D. In this state, the operating piece of the upper frame fixing means (not shown) is engaged with the stopper (not shown) to fix the upper frame 3. After fixing the upper frame 3, the four covers 21 are magnetically attached to the frame body 14 and positioned at the positions indicated by the solid lines in FIG.

When vibration energy is detected by a seismic device (not shown), the upper frame fixing means (not shown) is activated, and the engagement between the operating piece and the stopper is released, so that the upper frame 3 with respect to the lower frame 2 is released. Can be moved. At this time, the frame 1
With the movement from the solid line position in FIG.
When the moving force of the frame body 14 becomes larger than the magnetic force of the magnet 21a, the cover 21 is opened from the solid line position in FIG. 5 to the two-dot chain line position.

During this movement, as shown in FIG.
When the upper frame 3 moves in the direction of the broken line arrow A in FIG. 5, the tension spring 20A extends in the direction of the broken line arrow a, and when the upper frame 3 moves in the direction of the solid line arrow B, the tension spring 20B moves in the solid line arrow b.
When the upper frame 3 moves in the direction of the alternate long and short dash line arrow C, the tension spring 20C extends in the direction of the alternate long and short dash line c, and when the upper frame 3 moves in the direction of the alternate long and two short dashes line arrow D, the tension spring 20D extends in the direction of the alternate long and two short dashes line. It extends in the direction of arrow d. Further, when the upper frame 3 is moved in an oblique direction (for example, a white arrow E direction), the two extension springs (the extension spring 20B and the extension spring 20).
C) grows.

Further, when the upper frame 3 is moved, the balls 16a of the ball bearing 16 roll on the plate member 8 in the perforated portion 9a, and when the moving amount of the upper frame 3 is large,
The ball bearing 16 collides with the regulation member 9 to regulate the movement of the upper frame 3. Regulation member 9 of ball bearing 16
Since the restriction member 9 is made of an elastic body at the time of collision with the restriction member 9, the shock transmitted to the upper frame 3 is absorbed by the restriction member 9.

When the vibration energy disappears, the upper frame 3 becomes 4
The tension springs 20A, 20B, 20C, and 20D return to the initial position again by the urging force. After that, the operation piece of the upper frame fixing means (not shown) is engaged with the stopper (not shown) to fix the upper frame 3, and the four covers 21 are magnetically attached to the frame body 14, respectively. It becomes the initial state.

In this first embodiment, the upper frame 3 as a movable base has a single stage, and as shown in FIG. 7, the lower frame 2 and the upper frame 3 each have a square shape and serve as a biasing means. Each tension spring 20 is attached at one end to the lower frame 2 and at the other end to the upper frame 3 so that the mounting shape is a shape along each side of the square and the mounting lengths are all equal. Although the seismic isolation device 1 described above is used, the seismic isolation device to which the present invention is applicable is not limited to this. For example, as shown in FIG. 8, each of the lower frame 24 and the upper frame 25 has a long side length. W has a rectangular shape having a length of at least twice the length L of the short side, and each tension spring 26 as a biasing means has its mounting shape centered on the center line S of the lower frame 24 and the upper frame 25. Make sure that the shape is along each side of the two squares, and that the mounting lengths are all equal. The seismic isolation device 23 differs from the seismic isolation device 1 in that the end is attached to the lower frame 24 and the other end is attached to the upper frame 25 symmetrically, or, as shown in FIG. 9, a lower frame 28 and an upper frame 29. Each has a long side length W
1 is a rectangular shape that is less than twice the length L1 of the short side, and each tension spring 30 as a biasing means is formed when the lower frame 28 and the upper frame 29 are divided into two from the center line S1. One diagonal line X1 of two rectangles X and Y parallel to each other
, And at the two corners of Y1, on the rectangular X side, attach one end of each tension spring 30A, 30B, 30C, 30D to the lower frame 2.
8, the extension springs 30E, 30F, 30 on the rectangular Y side
One end of each of G and 30H is attached to the upper frame 29, and the other end of each tension spring 30 is such that its attachment shape is a shape along each side of two rectangles, and its attachment length is all. Tension springs 30A, 30B, 30
C and 30D have upper frames 29 and tension springs 30E, 30F and 3
0G and 30H differ from the seismic isolation device 1 in that they are attached to the lower frame 28, respectively, and further,
As shown in FIG. 10, two stages of upper frames 33, 3 are used as movable bases.
4, each upper frame 33, 34 has a plurality of rollers 35, and the lower frame 32 and the upper frame 33 are rollers 3.
It is also possible to apply the seismic isolation device 31 having a well-known configuration having the rails 36 corresponding to the six.

When the seismic isolation devices 23 and 27 are used, the cover 2 is used as in the first embodiment using the seismic isolation device 1.
1 is used and the seismic isolation device 31 is used, as shown in FIG.
The cover 37 shown in is used.

Similar to the cover 21, a cover 37 made of a steel plate material or a resin material whose outer surface is coated or decorated to cover the four sides of the lower frame 32 and the upper frames 33 and 34, respectively. The base end is hinged to a lower frame 32.
Four are attached to the lower part of. The cover 37 has a magnet 3 that extends over the substantially entire width of the cover 37 near its free end.
7a, and a cushioning member 37b made of rubber or the like arranged in the width direction at a substantially central portion thereof.
When the seismic isolation device 31 in which the operating piece of the upper frame fixing means (not shown) is engaged with the stopper (not shown) is inoperative, the magnet 37a is magnetically attached to the side surface of the upper frame 34 and the cushioning member 37b is attached to the side surface of the upper frame 33. Is placed in the position indicated by the solid line in the figure.

When the seismic isolation device 31 whose vibration energy is detected by a seismic sensor (not shown) is operating,
When the moving force of the upper frame 34 becomes larger than the magnetic force of the magnet 37a as the upper frame 34 moves from the solid line position in FIG. 11 to the two-dot chain line position, the cover 37 moves from the solid line position in FIG. 11 to the two-dot chain line position. Is released.

FIG. 12 shows a seismic isolation device 1 which employs a second embodiment of the present invention. This second embodiment is based on the first
Compared with the embodiment described above, the only difference is that the cover 38 and the hinge 39 are used instead of the cover 21 and the hinge 22, and that the lower frame 2 is arranged below the floor surface.

Like the cover 21, the cover 38 is made of a steel plate material or a resin material whose outer surface is painted or decorated, and the size in the height direction of the cover 38 is approximately half the size of the cover 21. To cover each of the four sides of the upper frame 3,
Four base ends are attached to the upper corners of the frame body 4 by hinges 39. The cover 38 has a magnet 38a that extends over substantially the entire width of the cover 38 at approximately the center thereof, and when the seismic isolation device 1 is inoperative when the operating piece of the upper frame fixing means (not shown) is engaged with the stopper (not shown). The magnet 38a is attached to the frame body 14 at the solid line position in the figure.

Then, when the seismic isolation device 1 whose vibration energy is detected by a seismic sensing device (not shown) is in operation, the magnet 38 is moved along with the movement of the frame 14 to the position of the chain double-dashed line.
When the moving force of the frame body 14 becomes larger than the magnetic attraction force of a, the cover 38 is opened from the solid line position in the figure to the two-dot chain line position.

As described above, when the lower frame 2 is arranged below the floor surface and the lower frame 2 is hard to be seen from the outside when the seismic isolation device 1 is not operating, it is necessary to cover the outer periphery of the lower frame 2. If not, the cost can be reduced by using the cover 38 that covers only the upper frame 3.

This second embodiment can be applied to the seismic isolation devices 23, 27, 31 and the like in addition to the seismic isolation device 1 as in the first embodiment. In this case, when applied to the seismic isolation devices 23 and 27, the cover 38 can be used, and when applied to the seismic isolation device 31, as shown in FIG. A base end is rotatably supported by 39, and a magnet 40a is provided near the free end.
Further, the cover 40 having the cushioning member 40b may be used slightly closer to the base end portion than the center thereof.

14 and 15 show seismic isolation devices 1 and 31, respectively, which employ the third embodiment of the present invention. The third embodiment differs from the first embodiment only in that covers 41 and 42 are used instead of cover 21 and hinge 22.

Similar to the cover 21, a fixed portion 41a and a movable portion rotatably connected to the fixed portion 41a by a hinge 43 are made of a steel plate material or a resin material whose outer surface is painted or decorated. The cover 41 composed of 41b is attached to the respective side surfaces of the frame body 4 with the fixing portions 41a by screwing or bonding so as to cover the four side surfaces of the lower frame 2 and the upper frame 3, respectively. The cover 41 has a magnet 41c that extends over substantially the entire width of the cover 41 at approximately the center of the movable portion 41b, and the seismic isolation device 1 is inoperative when the operating piece of the upper frame fixing means (not shown) is engaged with the stopper (not shown). At this time, the frame body 14 is placed at the position indicated by the solid line in FIG.

Then, when the seismic isolation device 1 in which vibration energy is detected by a seismic sensing device (not shown) is operating, the magnet 41 is moved along with the movement of the frame body 14 to the position of the chain double-dashed line.
When the moving force of the frame body 14 becomes larger than the magnetic coercive force of c, the movable portion 41b is opened to the two-dot chain line position in the figure. The cover 41 is applicable to the seismic isolation devices 23 and 27 as well as the seismic isolation device 1.

The cover 42 used for the seismic isolation device 31 and made of the same material as the cover 41 includes a fixing portion 42a,
The movable portion 42b is rotatably connected to the fixed portion 42a by a hinge 43, and the fixed portion 42a is screwed or bonded to each side surface of the lower frame 32 to cover the four side surfaces of the upper frames 33 and 34. Installed by. Movable part 42b
A magnet 42c is provided near the free end of the movable part 42b, and a cushioning member 42d is provided near the center of the movable part 42b. During operation of the seismic isolation device 31, the cover 42 moves the movable portion 42b as shown in FIG. It is opened to the position indicated by the dashed line.

In each of the first to third embodiments, the cover or the movable portion is rotatably supported by the lower frame or the fixed portion, but the cover or the movable portion and the lower frame or the fixed portion are engaged with each other. The cover may be detachable, and the cover may be removed from the device body when the seismic isolation device is activated.

In each of the first to third embodiments, the tip of the free end of the cover is set to the upper end of the side surface of the upper frame. However, the tip of the free end of the cover is set to the installation body mounting surface on the upper surface of the upper frame. You may bend and extend it to the position except. In this case, the tip of the free end of the cover is set to a position that does not hinder the movement of the upper frame when the cover is opened.

FIG. 16 and FIG. 17 show seismic isolation devices 1 and 31 adopting the fourth embodiment of the present invention, respectively. Compared with the first embodiment, the fourth embodiment has the covers 44 and 45 and the hinge 4 instead of the cover 21 and the hinge 22.
The only difference is that 6 is used.

Similar to the cover 21, a cover 44 made of a steel plate material or a resin material whose outer surface is painted or decorated has its base end hinged by hinges 46 so as to cover the four side surfaces of the lower frame 2. Four pieces are attached to the lower part of the lower frame 2. The cover 44 has a magnet 44a that extends over substantially the entire width of the cover 44 at approximately the center thereof. When the seismic isolation device 1 is inoperative when the operating piece of the upper frame fixing means (not shown) is engaged with the stopper (not shown), The magnet 44a is attached to the frame body 14 at the solid line position in the figure.

Then, when the seismic isolation device 1 whose vibration energy is detected by a seismic sensing device (not shown) is operating, the magnet 44 is moved along with the movement of the frame 14 to the position of the chain double-dashed line.
When the moving force of the frame body 14 becomes larger than the magnetic attraction force of a, the cover 44 is opened to the position of the chain double-dashed line in the figure. This cover 4
4 is applicable to the seismic isolation devices 23 and 27.

The cover 45 used for the seismic isolation device 31 is
Four base ends of the lower frame 32 and the upper frame 33 are attached to the lower portion of the lower frame 32 by hinges 46 so as to cover the four side surfaces of the lower frame 32 and the upper frame 33, respectively. The cover 45 has a magnet 45a that extends over substantially the entire width of the cover 45 near the free end thereof, and when the seismic isolation device 31 in which the operating piece of the upper frame fixing means (not shown) is engaged with the stopper (not shown) is inactive. , The magnet 45a is magnetically attached to the upper frame 33, and the upper frame 3 is placed at the position indicated by the solid line in the figure.
When the moving force of the upper frame 34 becomes larger than the magnetic force of the magnet 45a as the moving force of 4 to the position of the chain double-dashed line, the cover 4
5 is opened to the position of the chain double-dashed line in the figure.

FIG. 18 shows a seismic isolation device 31 which adopts a modification of the fourth embodiment of the present invention. This variation is
Compared with the fourth embodiment, the only difference is that a cover 47 is used instead of the cover 45.

Four covers 47 are attached to the lower part of the lower frame 32 by hinges 46 so as to cover the four side surfaces of the lower frame 32. The cover 47 has a magnet 47a that extends over substantially the entire width of the cover 47 at a substantially central portion thereof, and when the seismic isolation device 31 is inoperative when the operating piece of the upper frame fixing means (not shown) is engaged with the stopper (not shown). The magnet 47a is attached to the lower frame 32 at the solid line position in the figure, and when the seismic isolation device 31 operates, the upper frame 3
When the moving force of the upper frame 33 becomes larger than the magnetic force of the magnet 47a as the moving force of 3 to the position of the chain double-dashed line, the cover 4
7 is opened at the position indicated by the chain double-dashed line in the figure.

In the fourth embodiment and the modification, the covers 44, 45, 47 are rotatably supported by the lower frames 2, 32, but the covers 44, 45, 47 and the lower frame 2, Three
It is also possible to adopt a configuration in which the cover 2 and the cover 2 are detachable from each other, and the covers 44, 45, 47 fall off from the main body of the device when the seismic isolation device operates.

In each of the first to fourth embodiments, the seismic isolation device has the upper frame fixing means (not shown), the stopper (not shown), and the seismic device (not shown). By adjusting the magnetic force or the number of magnets installed in the upper frame, movement of the upper frame is restricted when the cover is closed, and movement of the upper frame is allowed when the vibration energy exceeds the magnetizing force of the magnet. It can be configured to.

FIG. 19 shows a seismic isolation device 1 which adopts the fifth embodiment of the present invention. This fifth embodiment is shown in FIG.
Compared with the first embodiment shown in FIG. 0, the only difference is that a cover 48 is used instead of the cover 21.

The cover 48, which is made of a steel plate material or a resin material or the like whose outer surface is coated or decorated, covers the four side surfaces of the lower frame 2 and the upper frame 3 with hinges (not shown) at their base ends. Four pieces are attached to the lower part of the lower frame 2. The cover 48 has a magnet 48a and a magnetic piece 48b at both ends thereof, and the magnet 48a of its own is arranged so as to correspond to the magnetic piece of the adjacent cover 48. The cover 48 is a solid line in the figure in which the magnets 48a and the magnetized pieces 48b are magnetically attached to each other when the seismic isolation device 1 is inactive when the operating piece of the upper frame fixing means (not shown) is engaged with the stopper (not shown). When the seismic isolation device 1 is placed in a position and the movement of the upper frame 3 causes the moving force of the upper frame 3 to be larger than the magnetic force of the magnet 48a when the seismic isolation device 1 is operating, the cover 48 opens to the two-dot chain line position in the figure. To be done.

Although the magnet 48a and the magnetic piece 48b are used in the above-mentioned embodiment, a member such as a magic tape which can be freely contacted and separated may be used instead. Alternatively, the cover 48 may be formed of a member such as a decorated paper, and the ends of the covers 48 may be fixed with an adhesive or the like so that the cover 48 is damaged when the seismic isolation device 1 operates. In this case, the damaged cover 48 is replaced with a new one.

Although the cover 48 is rotatably supported by the lower frame 2 in the fifth embodiment and the modified example, the cover 48 and the lower frame 2 can be engaged and disengaged to each other, and A configuration may be adopted in which the cover 48 drops off from the main body of the apparatus during operation.

Further, in the fifth embodiment, the seismic isolation device 1 has the upper frame fixing means (not shown), the stopper (not shown), and the seismic device (not shown). By adjusting the magnetic force of the magnets 48a or the number of the magnets 48a arranged, the movement of the upper frame 3 is restricted in the state where the cover 48 is closed, and when the vibration energy exceeds the magnetic attraction force of the magnets 48a, the upper frame 3 is moved.
Can be allowed to move.

Furthermore, in each of the first to fifth embodiments,
The seismic isolation device has a rectangular upper and lower frame and independent covers are provided on each of the four sides, but as the seismic isolation device, the upper and lower frames are semicircular, triangular, A polygon such as a polygon having one or more sides can be used, and as shown in FIGS.
Depending on the installation location of the seismic isolation device, it is possible to install a cover independently at only the necessary place.

[0066]

According to the present invention, since the seismic isolation device has a cover that can be opened when the seismic isolation device is in operation, the outer shape of the cover when the device is not in operation is substantially the same as the outer shape of the seismic isolation device. Therefore, the appearance of the seismic isolation device can be improved and the installation space of the seismic isolation device can be reduced.

[Brief description of drawings]

FIG. 1 is a perspective view of a seismic isolation device that employs a first embodiment of the present invention.

FIG. 2 is a partial perspective view showing a fixing base used in the first to third embodiments of the present invention.

FIG. 3 is an exploded perspective view showing a plane plate used in the first to third embodiments of the present invention.

FIG. 4 is a partial perspective view showing a movable table used in the first to third embodiments of the present invention.

FIG. 5 is a partial side view showing a cover used in the first embodiment of the present invention.

FIG. 6 is a perspective view showing a mounting state of biasing means used in the first to third embodiments of the present invention.

FIG. 7 is a schematic top view of the seismic isolation device used in the first embodiment of the present invention.

FIG. 8 is a schematic top view of a seismic isolation device used in a modification of the first embodiment of the present invention.

FIG. 9 is a schematic top view of a seismic isolation device used in another modification of the first embodiment of the present invention.

FIG. 10 is a side view of a seismic isolation device used in another modification of the first embodiment of the present invention.

FIG. 11 is a partial side view showing a cover used in another embodiment of the first embodiment of the present invention.

FIG. 12 is a partial side view showing a cover used in a second embodiment of the present invention.

FIG. 13 is a partial side view showing a cover used in a modification of the second embodiment of the present invention.

FIG. 14 is a partial side view showing a cover used in the third embodiment of the present invention.

FIG. 15 is a partial side view showing a cover used in a modification of the third embodiment of the present invention.

FIG. 16 is a partial side view showing a cover used in a fourth embodiment of the present invention.

FIG. 17 is a partial side view showing a cover used in the fourth embodiment of the present invention.

FIG. 18 is a partial side view showing a cover used in a modification of the fourth embodiment of the present invention.

FIG. 19 is a top view showing a cover used in the fifth embodiment of the present invention.

FIG. 20 is a top view showing a cover used in the first embodiment of the present invention.

FIG. 21 is a diagram showing one use state of a seismic isolation device for explaining a modified example of the present invention.

FIG. 22 is a view showing one usage state of a seismic isolation device for explaining a modified example of the present invention.

[Explanation of symbols]

1, 23, 27, 31 Seismic isolation device 2, 24, 28, 32 Fixed base (lower frame) 3, 25, 29, 33, 34 Movable base (upper frame) 20, 26, 30 Biasing means (tensile spring) 21, 37, 38, 40, 41, 42, 44, 45, 4
7,48 cover

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Ichiro Ikenaga               Kumamoto City, Kumamoto Prefecture, 3-8-1, Kumamoto, Fri               Gou Co., Ltd.                (56) References JP-A-8-284115 (JP, A)                 Japanese Patent Sho 60-39831 (JP, B2)

Claims (3)

(57) [Claims] Is disposed between the 1. A floor and installation body, a seismic isolation device for blocking vibration energy transmitted from the floor side, a fixing base to be placed on the floor, the fixed It is almost the same size as the base and faces the fixed base.
Arranged between the movable table on which the installation body is mounted and the fixed table and the movable table below the movable table, and returning the movable table after the movement to the position before the movement. Urging means, and located at least in front of the movable table or the fixed table .
Cover that covers the side surface that opens and that opens as the movable table moves.
Seismic isolation device characterized by being provided and. 2. The cover has a predetermined vibration energy.
When it does not reach the value, it does not separate from the movable table and
The movement of the movable table with respect to the fixed table is restricted, and the vibration energy is reduced.
When the luge reaches a predetermined value, it is removed from the movable table.
2. The seismic isolation device according to claim 1, wherein the movable table is allowed to move with respect to the fixed table . 3. A plurality of the covers are provided adjacent to each other.
The adjacent ends of the covers are detachable from each other.
Fixed and the vibration energy does not reach a predetermined value
In this case, the plurality of covers are fixed to each other without being separated from each other.
The movement of the movable table with respect to the table is restricted, and the vibration energy is reduced.
When the gear reaches a predetermined value, the covers are in contact with each other.
Seismic isolation device according to claim 1 or claim 2 wherein disengaged to have characterized by allowing the movement of said movable base with respect to the fixed base.