JPH11294527A - Base isolation table - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a base isolation table capable of prolonging the maximum travels of an intermediate frame and an upper frame and smoothly moving them without enlarging the base isolation table. SOLUTION: An X direction support mechanism 40 movably supporting an intermediate frame in the X direction comprises a guide member 41 provided in a lower frame, a guide member 42 provided in an intermediate frame, and an X direction support carrier 43. The guide members 41 and 42 are formed with first and second faces 412 and 413 inclining downward, and first and second faces 422 and 423 inclining upward, which extend in the X direction and incline in opposite directions opposite to each other respectively. An X direction carriage 43 comprises rollers 431 contacting the inclined first and second inclined faces 412, 422, 413 and 423 while rolling and small retainer pieces 436 rotatably supporting each roller 431. The small retainer pieces 436 are rotatably connected to each other. A Y direction support mechanism movably supporting an upper frame in the Y direction is constituted in the same manner as in the X direction support mechanism 40.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a seismic isolation base for preventing a display case or the like from rolling due to an earthquake.

[0002]

2. Description of the Related Art Generally, as shown in FIG. 18, this type of seismic isolation table includes a lower frame 1, an intermediate frame 2, and an upper frame 3, which are sequentially arranged from bottom to top. The frame 1 is mounted and fixed on a floor or the like, and a display case (not shown) or the like is mounted on the upper frame 3. The intermediate frame 2 is supported by the lower frame 1 via a carriage 4 so as to be movable in the X direction, and the upper frame 3 is supported by the intermediate frame 2 via the carriage 4 so as to be movable in the Y direction. Therefore, when the lower frame 1 is vibrated in the X and Y directions due to an earthquake or the like,
Intermediate frame 2 and upper frame 3 are lower frame 1
Moves in the opposite direction relative to. As a result, the upper frame 3 is kept at a fixed position, and the display case placed on the upper frame 3 is prevented from rolling.

[0003]

In the above-mentioned conventional seismic isolation table, the bogie 4 is fixed to the intermediate frame 2, so that the intermediate frame 2 is separated from the lower frame 1 by a distance L as shown in FIG. , The carriage 4 also moves by the same distance L with respect to the lower frame 1. Therefore, in order to increase the maximum movement distance of the intermediate frame 2 so that a sufficient seismic isolation effect can be obtained even for an earthquake having a large amplitude, it is necessary to enlarge the lower frame 1.
Otherwise, the trolley 4 will come off the lower frame 1. The same applies to the relationship between the intermediate frame 2 and the upper frame 3. For this reason, when trying to increase the maximum movement distance of the intermediate frame 2 and the upper frame 3, there is a problem that the entire seismic isolation table becomes large.

[0004]

SUMMARY OF THE INVENTION An object of the present invention is to increase the maximum moving distance of an intermediate frame and an upper frame without increasing the size of a seismic isolation table.
In order to achieve such an object, the invention according to claim 1 includes a lower frame, an intermediate frame, and an upper frame that are sequentially arranged from bottom to top, and is disposed between the lower frame and the intermediate frame. And an X-direction support mechanism for supporting the intermediate frame so as to be relatively movable in one direction in the horizontal plane (hereinafter, referred to as X direction), and relatively moving the upper frame in the Y direction orthogonal to the X direction in the horizontal plane. A seismic isolation table having a Y-direction support mechanism that supports the X-direction support mechanism, wherein the X-direction support mechanism and the Y-direction support mechanism are each provided three or more, and the X-direction support mechanism is provided on the upper surface of the lower frame. The first, arranged in a line along the X direction and inclined in opposite directions to each other,
A second lower inclined surface, and first and second parallel surfaces which are disposed on the lower surface of the intermediate frame so as to face the first and second lower inclined surfaces, respectively, and are parallel to the first and second lower inclined surfaces. A first bogie having an upper inclined surface, a rolling element that is in rolling contact with the first lower inclined surface and the first upper inclined surface, a second lower inclined surface, and a second upper inclined surface A third carriage having a rolling body that comes into rolling contact with the second carriage, wherein the Y-direction support mechanism is arranged in a line along the Y direction on the upper surface of the intermediate frame, and is inclined in opposite directions to each other; A fourth lower inclined surface, and the third and fourth lower inclined surfaces are disposed on the lower surface of the upper frame so as to face the third and fourth lower inclined surfaces, respectively;
A third and a fourth upper inclined surface parallel to the lower inclined surface;
A third bogie having a rolling element that comes into rolling contact with the lower inclined surface and the third upper inclined surface, and a third carriage that has a rolling element that comes into rolling contact with the fourth lower inclined surface and the fourth upper inclined surface. And the first and second carriages are connected to each other so as to move integrally with each other in the X direction, and the third and fourth carriages are moved together with each other in the Y direction. Are connected to each other.

In this case, it is desirable that each of the first to fourth carriages has a plurality of rolling elements and a retainer for rotatably supporting each rolling element. Each of the retainers of the first and second bogies is formed separately from a retainer small piece for rotatably supporting the rolling elements on the second and first bogie sides, and the other rolling elements are rotatable. , And adjacent retainer small pieces, and adjacent retainer small pieces and retainer pieces are rotatably connected to each other. Each retainer of the third and fourth carriages is
The fourth and third bogies comprise a small retainer piece rotatably supporting the rolling element, and a retainer piece formed separately from the small retainer piece and rotatably supporting another rolling element,
Desirably, adjacent retainer small pieces and adjacent retainer small pieces and retainer pieces are rotatably connected. Each of the retainer pieces of the first to fourth carts is
It is desirable that the retainer includes a plurality of retainer pieces that rotatably support the rolling element, and that the retainer pieces are rotatably connected to each other.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to FIGS. 1 to 8
1 shows a first embodiment of the present invention. As shown in FIG. 1 and FIG.
Lower frame 1 sequentially arranged from bottom to top
0, an intermediate frame 20 and an upper frame 30. Although the shapes and sizes of these frames 10, 20, and 30 are arbitrary, in this embodiment, square plates of the same shape and the same size are used. The lower frame 10
It is placed and fixed on the floor F or on the upper surface of another table. On the upper surface of the upper frame 30, an article to be prevented from rolling due to an earthquake, for example, a display case C is placed.

[0007] Each frame 10, 20, 30 is normally located at the same position in the horizontal direction when no earthquake occurs, and its four sides are vertically overlapped with each other. Hereinafter, the positions of the intermediate frame 20 and the upper frame 30 at this time are referred to as initial positions. When two directions orthogonal to each other in the horizontal plane are defined as an X direction and a Y direction, two sides of each of the frames 10, 20, and 30 are parallel to the X direction, and the other two sides are parallel to the Y direction. ing.

The intermediate frame 20 has an X-direction support mechanism 40
Thus, it is supported by the lower frame 10 so as to be relatively movable in the X direction. The X-direction support mechanism 40 is disposed at one end and the other end of one of two sides parallel to the X direction, and at one end and the other end of the other side. A total of four with the other pair are arranged. Upper frame 30
Are supported by the intermediate frame 20 by the Y-direction support mechanism 50 so as to be relatively movable in the Y-direction. Y direction support mechanism 5
0 is a pair arranged at one end and the other end of one side of the two sides parallel to the Y direction, and another pair arranged at one end and the other end of the other side. And a total of four are arranged.

The X-direction support mechanism 40 includes a pair of guide members 41 and 42 and an X-direction support cart 43, as shown in FIGS. One guide member 41 is
It is arranged and fixed on the upper surface of the lower frame 10 along the side extending in the X direction. On an upper surface of the guide member 41, a guide groove 411 extending from one end to the other end in the longitudinal direction is formed. The bottom surface of the guide groove 411 is the first lower inclined surface 412 on one end side of the guide groove 411 in the longitudinal direction.
And a second lower inclined surface 413 on the other end side. The first and second lower inclined surfaces 412 and 413 have a downward slope from the longitudinal end of the guide groove 411 toward the center. That is, the first and second lower inclined surfaces 412, 4
13 are inclined in opposite directions. However, the inclination angles of the first and second lower inclined surfaces 412 and 413 are the same, and their adjacent ends are smoothly connected by an arc surface.

The other guide member 42 is connected to the upper frame 2.
On the lower surface of the “0”, its longitudinal direction is oriented in the Y direction, and furthermore, it is arranged and fixed facing the guide member 41. On the lower surface of the guide member 42, a guide groove 421 extending from one end to the other end in the longitudinal direction is formed. This guide groove 4
21 has a first upper inclined surface 422 on one end side in the longitudinal direction of the guide groove 421 and a second upper inclined surface 423 on the other end side.
Is divided. First and second upper inclined surfaces 422, 4
23 is parallel to the first and second lower inclined surfaces 412 and 413, respectively. Moreover, the first and second upper inclined surfaces 4
22 and 423 are first and second lower inclined surfaces 412 and 413 when the intermediate frame 20 is located at the initial position.
And the same position in the X and Y directions.

The X-direction support cart 43 includes a plurality of rolling rollers (rolling members) 431 and a retainer 435 for rotatably supporting each rolling roller 431. A plurality of rolling rollers 431, an odd number of which are used, are arranged at a constant pitch with the axis thereof oriented in the Y direction. Moreover, when the intermediate frame 20 is located at the initial position, one of the rolling rollers 431 is located at the connection portion of the first and second lower inclined surfaces 412 and 413, and the other half Are in rolling contact with the first lower inclined surface 412 and the first upper inclined surface 422, and the other half is in rolling contact with the second lower inclined surface 413 and the second upper inclined surface 423. ing. Therefore, the intermediate frame 20 is supported by the lower frame 10 via the rolling rollers 431 so as to be movable in the X direction. As for the rolling rollers 431, an even number of the rolling rollers 431 are used, and half of them are the first upper and lower inclined surfaces 412,
422 and the other half of the second upper and lower inclined surfaces 41
3,423.

As shown in FIG. 4C, the length of the rolling element 431 is substantially equal to the width of the guide grooves 411 and 421. Therefore, both end surfaces of the rolling roller 431 come into contact with both side surfaces of the guide grooves 411 and 421, respectively.
Thus, the movement of the intermediate frame 20 in the Y direction is prevented.

The retainer 435 is composed of a plurality of small retainer pieces 436 as shown in FIGS. Each retainer small piece 436 is formed by stamping and pressing a plate material, and has a connection hole 437 at one end thereof.
Is formed, and a substantially semicircular holding portion 437 is formed at the other end. The two retainer pieces 436 and 436 adjacent to each other in the X direction are turned in the opposite directions, and
7,437 are overlapped so that their axes coincide. And it is rotatably connected by a shaft 439 inserted through the connection holes 437, 437. As shown in FIGS. 7 and 8, the holding portion 438 of each retainer small piece 436 is fitted in an annular groove 432 formed on the outer peripheral surface of the central portion of the rolling roller 431, and is rotatably fitted on the bottom surface of the annular groove 432. I agree. As a result, the rolling rollers 431 become small retainer pieces 436.
It is supported rotatably. In this case, the rolling rollers 431 arranged at both ends in the X direction are supported only by one retainer small piece 436, while the other rolling rollers 4 are not supported.
31 is supported by two retainer pieces 436. As a result, the plurality of rolling rollers 431 are sequentially connected by the retainer small pieces 436, and constitute one X-direction support cart 43 as a whole.

The Y-direction support mechanism 50 is disposed between the intermediate frame 20 and the upper frame 30, and is disposed along the Y-direction.
It is configured similarly to. Therefore, the Y-direction support mechanism 50
The description of is omitted.

In the base isolation table A having the above configuration, FIG.
As shown in (A) and (B), it is assumed that the intermediate frame 20 located at the initial position has relatively moved to the right by a distance L. Then, as the intermediate frame 20 moves, the X-direction support cart 43 moves rightward. In this case, each rolling roller 431 of the X-direction support truck 43 is inclined
2, 413, 423 in contact with rolling
The moving distance of No. 3 is L / 2, which is half the moving distance of the intermediate frame 20. Therefore, even if the maximum movement distance of the intermediate frame 20 is increased, it is not necessary to increase the size of the lower frame 10. The same applies to the relationship between the intermediate frame 20, the upper frame 30, and the Y-direction support mechanism 50. Therefore, in the seismic isolation table A, the maximum movement distance of the intermediate frame 20 and the upper frame 30 can be increased without increasing the overall size.

In the seismic isolation table A, the intermediate frame 20 and the upper frame 30 can always be relatively smoothly moved. That is, as shown in FIGS. 3 and 4, the intermediate frame 20 moves upward with the rightward movement. Therefore, when the intermediate frame 20 moves to the right, the first upper inclined surface 422 separates upward from the left rolling roller 431 that was initially in contact with the first lower inclined surface 412. In this state, when the intermediate frame 20 turns its moving direction to the left and reaches the initial position, the first upper inclined surface 422 comes into contact with the left rolling roller 431.

If each of the left rolling rollers 431 is stopped, the stopped rolling rollers 431 must be instantaneously moved at the same speed as the intermediate frame 20. Has a large impact, and smooth relative movement is hindered. As a result, there is a possibility that the display case C may vibrate laterally. In this case, if the display case C allows a small roll, there is not much problem. However, if a precision machine which dislikes vibration is mounted on the upper frame 30, it becomes a big problem.

In this regard, in the seismic isolation table A, since the entire X-direction support truck 43 moves integrally, the intermediate frame 20 turns the moving direction to the left and returns to the initial position, and the first upper inclined surface When the roller 422 comes into contact with the roller 431, the roller 431 on the left side is also rotating at the same speed as the intermediate frame 20. Therefore, the intermediate frame 20 can move smoothly without an impact.
The same applies to the case where the intermediate frame 20 moves rightward and reaches the initial position, and the same applies to the upper frame 30.

When the X-direction support cart 43 moves,
The center rolling roller 431 is the first or second lower inclined surface 41
2, 413, and also depending on the moving distance of the X-direction moving carriage 43,
The rolling rollers 431, 431 or more rolling rollers 431 adjacent to both sides of the first 31 move the rolling surfaces from the first and second inclined surfaces 412, 413 to the second and first lower inclined surfaces 41.
Change to 3,412. However, since the small retainer pieces 436 are rotatably connected to each other, the rolling rollers 431 can easily change the rolling surface. Therefore, X
The direction support truck 43 can move smoothly.

The X-direction supporting cart 43 may be divided into first and second carts. In this case, the first bogie includes a plurality of rolling rollers that are in rolling contact with the first upper and lower inclined surfaces 412 and 422, and a retainer that rotatably supports each rolling roller. The second bogie includes a plurality of rolling rollers that are in rolling contact with the second upper and lower inclined surfaces 413 and 423, and a retainer that rotatably supports each rolling roller.

However, the X-direction support cart 43 is connected to the first and second
When divided into carts, they must be moved together. This is to prevent an impact from acting on the intermediate frame for the above reason. Therefore, when dividing the X-direction supporting cart 43 into the first and second carts,
They are connected by a connecting member so that they move together. In this case, the connecting member is rotatably connected to the first and second carts since the posture thereof changes with the movement of the first and second carts.

When the intermediate frame 2 moves leftward or rightward by the maximum moving distance, the rolling rollers of the first and second bogies roll to the second and first lower inclined surfaces 413 and 412, respectively. If it does not move, the entire retainers of the first and second carriages may be formed integrally. Conversely, when the intermediate frame 2 has moved by the maximum movement distance, some of the rolling rollers of the first bogie located on the second bogie side have the second lower inclined surface 413. , The retainer may be divided into a plurality of retainer pieces and the respective retainer pieces may be rotatably connected as in the above embodiment, or the second lower inclined surface of the retainer may be used. Only the portion that rotatably supports the rolling rollers that reach 413 is a retainer piece, the retainer pieces are rotatably connected to each other, and the retainer piece of the retainer piece that is arranged farthest from the second bogie. May be rotatably connected to the remaining portion (retainer piece) of the retainer.
This is the same for the retainer of the second carriage.

The above-described modification of the X-direction support trolley 40 can be similarly applied to the Y-direction support trolley 50. As is apparent from the above description, in the seismic isolation table A of this embodiment, the first and second carriages are integrally formed to form the X-direction support carriage 40, and the third and fourth carriages are integrally formed. To form a Y-direction support cart 50.

Next, another embodiment of the present invention shown in the drawings will be described. In the following embodiments, only configurations different from those in the above-described embodiment will be described, and components similar to those in the above-described embodiment will be omitted from the drawings, or will be given the same reference numerals and will not be described. Omitted. In addition, only the configuration related to the lower frame 10, the intermediate frame 20, and the X-direction support mechanism 40 will be described, but the configuration is the same for the intermediate frame 20, the upper frame 30, and the Y-direction support mechanism 50.

FIG. 9 shows a second embodiment of the present invention. In this embodiment, a horizontal lower connection is provided between the first and second lower inclined surfaces 412 and 413. A surface 414 is formed. It is desirable that both ends of the lower connection surface 414 be smoothly connected to the first and second lower inclined surfaces 412 and 413 via an arc surface. Similarly, the first,
A horizontal upper connecting surface 424 is formed between the second upper inclined surfaces 422 and 423 to smoothly connect them.

FIGS. 10A and 10B show a third embodiment of the present invention.
In this embodiment, the first and second lower inclined surfaces 412 and 413 are formed by one circular arc surface. First and second lower inclined surfaces 4
12, 413 are the lowest at the ends connected to each other, and gradually increase as the distance from the ends increases.
The first and second upper inclined surfaces 422 and 423 are also formed by one circular arc surface. Of course, the radius of curvature of the arc surface forming the first and second lower inclined surfaces 412, 413,
The radius of curvature of the arc surface forming the first and second upper inclined surfaces 422 and 423 is set to the same size.

In this embodiment, when the intermediate frame 20 moves in the X direction, only the rolling rollers 431 arranged on the rightmost or leftmost side are moved by the intermediate frame 2.
0 will be supported. However, the occurrence of an earthquake is short, and there is no problem in strength or durability since the rolling rollers 431 support the intermediate frame 20 at normal times when the intermediate frame 20 is located at the initial position.

FIG. 11 shows a modification of the retainer small piece 436. In this retainer small piece 436,
Holders 438 are formed at both ends. And
The two rolling rollers 43 are held by the holding portions 438 and 438.
1, 431 are rotatably supported. Therefore, two adjacent retainer pieces 436, 436
Are rotatably connected via one rolling roller 431 which both rotatably support.

FIGS. 12A and 12B show a modified example of the X-direction support truck 43.
In No. 3, shaft portions 433 and 433 are formed at the center of both end surfaces of the rolling rollers 431, respectively. Then, two adjacent retainer small pieces 436, 4
33 are rotatably connected to each other. However, the shaft portions 43 of the rolling rollers 431 arranged at both ends of the carriage 43
3, only one retainer piece 436 is rotatably connected. As described above, when the retainer small pieces 436 and 436 are connected to both sides of the rolling roller 431, the axis of the rolling roller 431 can always be directed in the Y direction. Therefore, the rolling roller 431 can smoothly roll in the guide grooves 411 and 421 in the X direction. It should be noted that the provision of the retainer small pieces 436 on both sides of the rolling rollers 431 can be applied to other embodiments in which the retainer small pieces 436 are fitted into the annular grooves 432, in which case the rolling rollers 431 are used. It is preferable to form two annular grooves 432 on the outer peripheral surface of.

FIG. 13 shows a modified example of the retainer small piece 436, and FIG. 14 shows the X-direction support truck 43 using the retainer piece 436. The retainer small piece 436 shown in these figures is formed by bending a relatively thick metal wire, and one end of the retainer small piece 436 has a substantially 2/3 arc-shaped holding portion 4.
38, and a substantially circular insertion hole 437 is formed at the other end.
Are formed. The holding portion 438 has an annular groove 4 of the rolling roller
The portion where 32 is formed is pushed in, whereby the rolling roller 431 is rotatably supported.

FIG. 15 shows the retainer small piece 43 shown in FIG.
6 is obtained by further deforming the retainer small piece 43.
In No. 6, holding portions 438 are formed at both ends.

FIGS. 16 and 17 show a fourth embodiment of the present invention. In this embodiment, the ends of a pair of X-direction support mechanisms 40, 40 adjacent to each other are connected to each other. They are arranged to overlap in the Y direction. With this arrangement, the X of the lower frame 10 necessary for disposing the pair of X-direction support mechanisms 40, 40 is arranged.
The length in the direction can be shortened, so that the seismic isolation table can be downsized. However, if the length of the overlapping portion (the length in the X direction) is too long, the support of the intermediate frame 20 by the four X-direction support mechanisms 40 becomes unstable. It is desirable that the length be equal to or less than half the length of 40. In this embodiment, the length of the overlapping portion is half that of the X-direction support mechanism.

The present invention is not limited to the above embodiment, but can be changed as appropriate. For example, in the above embodiment, four X-direction support mechanisms 40 and four Y-direction support mechanisms 50 are provided.
You may provide three each. In this case, it is desirable to arrange the X-direction support mechanism 40 and the Y-direction support mechanism so as to be located at triangle vertices such as isosceles triangles or equilateral triangles. Further, in the above embodiment, the X-direction support carriages 43, 43 of the pair of X-direction support mechanisms 40, 40 are moved independently of each other, but both move at the same speed and the same distance. Therefore, both may be connected by a connecting member so as to move integrally with each other. By doing so, the X-direction supporting carts 43, 43 can be surely moved at the same speed and the same distance. In the above-described embodiment, the first and second upper and lower inclined surfaces 412 and 413;
422 and 423 are formed on the guide members 41 and 42 fixed to the lower frame 10 and the intermediate frame 20, respectively.
May be formed directly. Further, rolling rollers 431 serve as rolling elements of the X-direction support mechanism 40 and the Y-direction support mechanism 50.
Is used, but a sphere may be used.

[0034]

As described above, according to the first to fourth aspects of the present invention, the maximum movement distance of the intermediate frame and the upper frame can be increased without increasing the size of the seismic isolation table. An effect is obtained that the intermediate frame and the upper frame can be smoothly moved relative to each other.

[Brief description of the drawings]

FIG. 1 is a front view showing a first embodiment of the present invention.

FIG. 2 is a plan view showing the display case of the embodiment with the display case removed;

FIG. 3 is a diagram showing a lower frame, an intermediate frame, and a pair of X-direction support mechanisms of the embodiment;
3A shows the initial state, and FIG. 3B shows the state in which the intermediate frame has moved.

4A and 4B are diagrams showing an X-direction support mechanism of the embodiment, wherein FIG. 4A shows an initial state, and FIG. 4B shows a state when an intermediate frame moves. (C) is FIG.
It is an expanded sectional view which follows a CC line of (A).

FIG. 5 is a side view illustrating a part of the X-direction support cart according to the embodiment, which is omitted;

FIG. 6 is a plan view showing a part of the X-direction support cart with the part omitted.

FIG. 7 is a side view showing a small retainer piece of the X-direction support cart.

FIG. 8 is a plan view showing the rolling rollers of the X-direction support cart.

FIG. 9 is a front view illustrating a part of an X-direction support mechanism according to a second embodiment of the present invention with the part omitted;

FIG. 10 is a view showing an X-direction support mechanism according to a third embodiment of the present invention, wherein FIG. 10 (A) shows an initial state,
FIG. 10B shows a state when the intermediate frame has moved.

FIG. 11 is a side view showing a modified example of a retainer piece.

FIG. 12 is a view showing a modification of the X-direction support truck with a part thereof omitted, and FIG. 12 (A) is a side front view thereof, FIG.
(B) is a plan view thereof.

FIG. 13 is a side view showing another modification of the retainer small piece.

FIG. 14 is a cross-sectional view showing a part of an X-direction support cart using the retainer small pieces shown in FIG.

FIG. 15 is a side view showing still another modified example of the retainer piece.

FIG. 16 is a plan view showing a fourth embodiment of the present invention except for an intermediate frame and an upper frame.

FIG. 17 is a front view showing a lower frame, an intermediate frame, and an X-direction support mechanism of the embodiment.

18 is a view showing an example of a conventional seismic isolation table, and FIG.
8A is a plan view thereof, and FIG. 18B is a front view thereof.

19 is an enlarged front view showing a part of the seismic isolation table shown in FIG. 18;

[Explanation of symbols]

 A seismic isolation table 10 lower frame 20 intermediate frame 30 upper frame 40 X-direction support mechanism 41 guide member 42 guide member 43 X-direction support carriage (first and second carriages) 50 Y-direction support mechanism 412 first lower inclined surface 413 second lower inclined surface 422 first upper inclined surface 423 second upper inclined surface 435 retainer 436 retainer small piece

Claims (4)

[Claims] 1. A lower frame, an intermediate frame, and an upper frame which are sequentially arranged from bottom to top, and are disposed between the lower frame and the intermediate frame, and the intermediate frame is disposed in one direction (hereinafter referred to as a horizontal plane). , X direction), and a Y direction support mechanism that supports the upper frame so as to be relatively movable in a Y direction perpendicular to the X direction in a horizontal plane. In the shaking table, three or more X-direction support mechanisms and three or more Y-direction support mechanisms are provided, and the X-direction support mechanisms are arranged on the upper surface of the lower frame in a line along the X direction, First and second lower inclined surfaces inclined in opposite directions to each other, and the first and second lower inclined surfaces are respectively arranged on the lower surface of the intermediate frame so as to face the first and second lower inclined surfaces. A first bogie having first and second upper inclined surfaces parallel to the lower inclined surface, a rolling element rollingly contacting the first lower inclined surface and the first upper inclined surface, A second bogie having a rolling element that is in rolling contact with the lower inclined surface and the second upper inclined surface, wherein the Y-direction support mechanism is arranged on the upper surface of the intermediate frame in a line along the Y direction. And third and fourth lower inclined surfaces inclined in opposite directions to each other, and disposed on the lower surface of the upper frame so as to face the third and fourth lower inclined surfaces, respectively. A third bogie having a third and a fourth upper inclined surface parallel to the lower inclined surface, a third bogie having a rolling element rollingly contacting the third lower inclined surface and the third upper inclined surface, A fourth bogie having a rolling element that is in rolling contact with the lower inclined surface and the fourth upper inclined surface; , A second truck is connected to each other so as to move integrally in the X direction, and the third and fourth trucks are connected to each other so as to move integrally in the Y direction. Seismic isolation table. 2. The seismic isolation table according to claim 1, wherein each of the first to fourth carts has a plurality of rolling elements and a retainer for rotatably supporting each rolling element. 3. The retainer of the first and second bogies,
A retainer small piece rotatably supporting the rolling elements on the second and first bogies side, and a retainer piece formed separately from the retainer small pieces and rotatably supporting other rolling elements,
Adjacent retainer small pieces, and adjacent retainer small pieces and retainer pieces are rotatably connected, and the retainers of the third and fourth bogies rotate the rolling elements on the fourth and third bogie sides. A retainer piece that freely supports, and a retainer piece that is formed separately from the retainer piece and that rotatably supports another rolling element, are constituted by adjacent retainer pieces, and adjacent retainer small pieces and retainer pieces. The seismic isolation table according to claim 2, wherein the base is rotatably connected. 4. A method according to claim 1, wherein each of the retainer pieces of the first to fourth carriages comprises a plurality of retainer pieces that rotatably support the rolling elements, and the retainer pieces are rotatably connected to each other. The seismic isolation table according to claim 3, characterized in that: