JPH11173376A - Base isolated bed - Google Patents

Abstract

PROBLEM TO BE SOLVED: To increase a relative displacement amount of an intermediate frame and an upper frame without increasing a size of a base isolated bed. SOLUTION: A track material 14 is provided in one end part and the other end part of two sides along X direction on a top face of a lower frame 11, respectively. A pair of inclined faces (not shown in the drawing) which form a downward gradient from one end part and the other end part toward the center are formed on a top face of the track material 14. A track material 18 is provided on a lower face of an intermediate frame 12 in the same way, and inclined faces which oppose to a pair of inclined faces, respectively, and are inclined at the same angle in the same direction are formed on a lower face of the track material 18. Movable bogies 21, 22 having rolling rollers 21a, 22a in rolling-contact with each inclined face are arranged between a pair of inclined faces an the inclined faces opposing to them. Track material 24, 28 extended in Y direction are provided in the intermediate frame 12 and an upper frame 13, respectively, and a section between them is constituted in the same way as a section between the track materials 14 and 18.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

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

[0002]

2. Description of the Related Art Generally, a seismic isolation table of this type is provided with a lower frame 1, which is disposed to face up and down, as shown in FIG.
An intermediate frame 2 and an upper frame 3;
The lower frame 1 is mounted and fixed on a fixed system such as a floor, and a display case (not shown) is mounted on the upper surface of the upper frame 3. Bogies 4 are provided on the lower surface of the intermediate frame 2 and the lower surface of the upper frame 3, respectively. This allows
The intermediate frame 2 is attached to the lower frame 1
The upper frame 3 is supported by the intermediate frame 2 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, the intermediate frame 2 and the upper frame 3 are displaced in the opposite directions relative to the lower frame 1, Thereby, the display case 1 can be prevented from being displaced in the X direction and the Y direction.

[0003]

In the above conventional seismic isolation table, as shown in FIG. 14, when the intermediate frame 2 is displaced relative to the lower frame 1 by a distance L, the carriage 4 is displaced by the same distance L. I do. Therefore, the intermediate frame 2
In order to increase the allowable displacement (maximum displacement) of the vehicle, in order to prevent the carriage 4 from coming off the lower frame 1,
The lower frame 1 needs to be enlarged. The same applies to the relationship between the intermediate frame 2 and the upper frame 3. Therefore, the intermediate frame 2 and the upper frame 3
There is a problem in that if the allowable displacement of the base is increased, the entire seismic isolation table becomes large.

[0004]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a seismic isolation table capable of increasing the allowable displacement of an intermediate frame and an upper frame without increasing the size of the entire 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 which are sequentially arranged from bottom to top, and two horizontal directions which are orthogonal to each other. X
The base frame is movably supported by the lower frame in the X direction, and the upper frame is supported by the intermediate frame movably in the Y direction. By providing a rolling element that is in rolling contact with both between the and the intermediate frame, by providing a rolling element that is in rolling contact with both between the intermediate frame and the upper frame, the intermediate frame in the lower frame, The upper frame is movably supported by the intermediate frame.

[0005] In this case, the rolling element may be a rolling roller or a sphere. Alternatively, a plurality of rolling elements may be used as one set, and the set of rolling elements may be rotatably supported by a retainer.

On the upper surface of the lower frame, a pair of inclined surfaces forming an upward gradient and a downward gradient in one of the X directions is formed along two sides of a virtual quadrilateral extending in the X direction. And two pairs are provided apart from each other in the X direction, and on the lower surface of the intermediate frame, inclined surfaces which are respectively vertically opposed to the inclined surfaces of the lower frame and which are inclined in the same direction are provided, and the lower frame and the intermediate The rolling elements are arranged between the inclined surfaces facing each other with the frame, and a pair of inclined surfaces forming an upward gradient and a downward gradient in one of the Y directions are formed on the upper surface of the intermediate frame. Are provided along two sides of the quadrilateral extending in the Y direction and separated from each other in the Y direction. Two pairs are provided on the lower surface of the upper frame so as to vertically face the inclined surfaces of the intermediate frame, respectively, in the same direction. Incline An inclined surface provided to place the rolling element between the inclined surfaces facing each other between the intermediate frame and the upper frame is desirable.

It is preferable that the inclined surface is formed in a V-shaped cross section by a pair of guide surfaces, and the rolling elements are arranged on each guide surface. Further, the pair of inclined surfaces may be arranged in one line or in two lines. In addition, a stopper is provided on each of the inclined surfaces provided on the upper surface of the lower frame and the upper surface of the intermediate frame to prevent the rolling elements disposed on each inclined surface from rolling downward. It is desirable.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to FIGS. First, a base isolation table 10 according to an embodiment of the present invention will be described with reference to FIGS.
To describe, as shown in FIG. 1 to FIG. 3, the seismic isolation table 10 includes a lower frame 1
1, an intermediate frame 12 and an upper frame 13.

The lower frame 11 has a square frame 11a formed of a hollow steel material having a rectangular cross section, and the same outer shape as the frame 1a in a plan view, and is mounted and fixed on the upper surface of the frame 11a. And a mounting plate 11b. A regulating shaft 11c is fixed upright at the center of the mounting plate 11b. The intermediate frame 12 is formed of a plate having the same outer shape as the mounting plate 11b in plan view, and has a circular regulating hole 1 penetrated by a regulating shaft 11c at the center thereof.
2a is formed. The upper frame 13 is
A frame 13a having the same shape and the same dimensions as a, and a mounting plate 13b having the same shape and the same dimensions as the mounting plate 11b and fixed to the lower surface of the frame 13a. A circular regulating hole 13c penetrated by the regulating shaft 11c is formed at the center of the mounting plate 13b.

The lower frame 11 is mounted and fixed horizontally on a floor or other fixing system (not shown). The intermediate frame 12 is disposed horizontally above the lower frame 11,
Assuming that two directions orthogonal to each other in the horizontal plane are an X direction and a Y direction, a movable cart 2
It is supported so as to be movable in the X direction via the first and second parts.
The upper frame 13 is horizontally disposed above the intermediate frame 12, and is connected to the intermediate frame 1 via movable carts 21 and 22.
2 is movably supported in the Y direction. On the upper frame 13, a display case C and the like are placed and fixed.

Intermediate frame 12 and upper frame 13
Means that no external force is acting on them (when the lower frame 11 is not displaced in the X and Y directions by the earthquake)
Have lower, middle and upper frames 11, 12,
13 are arranged so that the sides thereof coincide with each other in a plan view, and the regulating shaft 11c penetrates each central part of the regulating holes 12a and 13c. Hereinafter, the positions of the intermediate frame 12 and the upper frame 13 in this state are referred to as initial positions.

The intermediate frame 12 has a regulating shaft 11c.
Can be moved in the X direction in a range from when it abuts the inner peripheral surface of one side in the X direction of the regulating hole 12a to when it abuts the inner peripheral surface of the other side. It is possible to move in the Y direction in a range from abutment on one side inner peripheral surface in the direction to abutment on the other side inner peripheral surface.

A track member 14 is provided on the upper surface of the mounting plate 11b of the lower frame 11. The track members 14 are arranged along one end and the other end of two sides of the mounting plate 11b extending in the X direction. The upper surface of each track member 14 has a sloped surface 14 at one end half and at the other end half.
a and 14b are respectively formed. One slope surface 1
4a has a downward gradient in one direction in the X direction (a direction from left to right in FIG. 1), and the other gradient surface 14b has an upward gradient in the same direction. That is, the two inclined surfaces 14a and 14b are inclined in opposite directions. In addition, the inclination angles of the inclined surfaces 14a and 14b with respect to the horizontal plane are the same.

As shown in FIG. 4 and FIG.
At the center in the width direction (Y direction) of a, a recess 15 having a rectangular cross section is formed extending from one end to the other end. The recess 15 extends along the slope 14a, and has a constant depth. Therefore, recess 1
5 has a bottom surface 15a inclined at the same angle as the inclined surface 14a. At the center in the width direction (Y direction) of the inclined surface 14b, a concave portion 16 having a rectangular cross section extending from one end to the other end is formed, and the bottom surface 16a of the concave portion 16 is inclined at the same angle as the inclined surface 14b. I have. Therefore, the bottom surfaces 15a and 16a of the concave portions 15 and 16 are inclined at the same angle but in opposite directions, and are arranged in a straight line. As is clear from this, the bottom surfaces 15a and 16a constitute a pair of inclined surfaces of the present invention. Less than,
The bottom surfaces 15a and 16a are referred to as inclined surfaces 15a and 16a.

As shown in FIGS. 1-3, the intermediate frame 1
A track member 18 is provided on the lower surface of 2. Track material 1
Numerals 8 are arranged along one end and the other end of the two sides extending in the X direction, respectively, and so as to vertically face the track member 14. Slope surfaces 18a and 18b are formed on one half of the lower surface of each track member 18 and the other half thereof, respectively. Each of the inclined surfaces 18a, 18b is inclined at the same angle as the inclined surfaces 14a, 14b.

As shown in FIG. 8, a recess 19 having a rectangular cross section extending from one end to the other end is formed at the center of the slope 18a in the width direction (Y direction). The recess 19 extends along the slope 18a, and has a constant depth. Therefore, the bottom surface 19 of the concave portion 19
a is inclined at the same angle as the inclined surface 18a, and is also inclined at the same angle and in the same direction as the inclined surface 15a. Similarly, a concave portion 20 having a rectangular cross section extending from one end to the other end thereof is formed along the inclined surface 18b, and the bottom surface 20a of the concave portion 20 is also inclined in the same direction at the same angle as the inclined surface 16a. I have. The inclined surfaces of the present invention are constituted by the bottom surfaces 19a and 20a. Therefore, in the following, the bottom surfaces 19a and 20a are referred to as inclined surfaces 19a and 20a.

A movable carriage 21 is provided between the recesses 15 and 19.
Is arranged. As shown in FIGS. 4 to 6, the movable carriage 21 includes a plurality of rolling rollers (rolling elements) 21a arranged in parallel on a plane and a retainer 21b rotatably supporting each rolling roller 21a. The rolling rollers 21a are in rolling contact with the inclined surfaces 15a and 19a, respectively. A rolling roller 2 is provided between the recesses 16 and 20.
A movable trolley 22 composed of 2a and a retainer 22b is arranged, and the rolling rollers 22a are in rolling contact with the inclined surfaces 16a and 20a. Therefore, the intermediate frame 2 includes four movable carts 21 and four movable carts 2 on the lower frame 1.
2 so as to be movable in the X direction. Moreover, since the pair of inclined surfaces 15a and 16a are inclined in opposite directions and the inclined surfaces 19a and 20a are inclined in opposite directions, the intermediate frame 2 has its own weight in a natural state where no force acts on it. At the initial position.

The length of each of the rolling rollers 21a, 22a is substantially the same as the width of the recesses 15, 19;
The lower side portions of the rolling rollers 21a and 22a are recessed portions 15 and 1 respectively.
6 and the upper side portions are fitted into the recesses 19 and 20. This prevents the intermediate frame 2 from moving in the Y direction with respect to the lower frame 1.

As shown in FIGS. 4 to 6 and FIG.
A stopper 23 is arranged and fixed at an intermediate portion in the longitudinal direction of each of 5 and 16. Each stopper 23 is provided with a movable carriage 21,
2 respectively, so that they are inclined surfaces 1
This is for preventing rolling down of 5a and 16a, and is arranged so as to hit the movable carriages 21 and 22 when the intermediate frame 2 is located at the initial position.

As shown in FIGS. 1 to 3, track members 24 and 28 extending in the Y direction are provided on the intermediate frame 12 and the lower surface of the mounting plate 13a of the upper frame 13, respectively. The track member 24 is provided on the upper surface of the intermediate frame 12 in the Y direction.
It is arranged at one end and the other end of two sides along the direction. The track members 28 are respectively disposed at one end and the other end of two sides along the Y direction on the lower surface of the mounting plate 13a. A movable carriage (not shown) is disposed between the track members 24 and 28, and the track member 24 is provided with a stopper (not shown). These track members 24, 28, movable carriage and stopper are the same as the track members 14, 18, movable carriage 21, 22 and stopper 23 except that the track members 24, 28 are arranged along the Y direction. Is configured. Therefore, a detailed description thereof will be omitted.
Of course, the upper frame 3 is supported by the intermediate frame 2 movably in the Y direction by the track members 24, 28 and the movable carriage, and is prevented from moving in the X direction.

As shown in FIGS. 1 and 7, the upper frame 13 is supported via brackets 32 with support shafts 31 extending along four sides thereof. The upper end of a decorative plate 33 that covers the side of the seismic isolation table 10 is rotatably supported by each support shaft 31. This decorative board 33
Is biased by a return spring 34 so that its lower end is directed toward the inside of the seismic isolation table 10, and its lower end is
5 and abuts on the lower frame 11. Here, the urging forces of the return springs 34, 34 for rotating the two facing decorative plates 33, 33 are the same as each other. Therefore, the intermediate frame 2 and the upper frame 3 not only return to the initial position due to their own weights, but also return to the initial position by the return spring 34.
In addition, the return spring 34 prevents the intermediate frame 2 and the upper frame 3 from being easily displaced when a slight force acts on the intermediate frame 2 and the upper frame 3 by, for example, a human hand. The decorative plate 33 may be configured such that the lower end thereof is rotatably provided on the lower frame 11 and the upper end thereof is abutted against the upper frame 13.

In the seismic isolation table 10 having the above-described structure, as shown in FIG.
When the vibration is displaced in the direction or the combined direction thereof, the intermediate frame 12 and the upper frame 13 are relatively displaced against their own weight and the urging force of the return spring 34.
In this case, the intermediate frame 12 and the upper frame 13
Is displaced relative to the lower frame 11 in the opposite direction by an amount substantially equal to the displacement amount. In other words, since the intermediate frame 12 and the upper frame 13 are relatively displaced with respect to the lower frame 11, there is almost no displacement from the initial position. Therefore, the display case C placed on the upper frame 13 hardly displaces. Therefore, it is possible to prevent the exhibit displayed in the display case C from falling down and being damaged. When the lower frame 11 stops, the entire frame returns to its original state. Of course, when the lower frame 11 is stopped, the intermediate frame 12 and the upper frame 13 may be slightly displaced from the initial positions. In such a case, due to their own weight and the urging force of the return spring 34, It is returned to the initial position.

Here, as shown in FIG. 8, it is assumed that the intermediate frame 12 (track member 18) is relatively displaced rightward in FIG. At this time, since the rolling rollers 22a of the movable carriage 22 are in rolling contact with the inclined surface 16a of the lower frame 11 and the inclined surface 20a of the intermediate frame 12, the movable carriage 2
2 is displaced rightward by a distance L, the intermediate frame 12
It is displaced by twice the displacement distance L ₁ of the movable carriage 22. In other words, the amount of displacement of the movable carriage 22 is
Is half of the displacement of Therefore, the intermediate frame 12
, The lower frame 11 does not need to be increased accordingly. The same applies to the relationship between the movable trolley 21 and the intermediate frame 12 when the intermediate frame 12 moves to the left.
The same applies to the relationship between 2 and the upper frame 13.
Therefore, according to the seismic isolation table 10 of the present invention, the maximum displacement of the intermediate frame 12 and the upper frame 13 can be increased without increasing the overall size.

It should be noted that the intermediate frame 12 is
When it is displaced with respect to 1, for example, when it is displaced to the left (right) in FIG.
, But the intermediate frame 12 is
Two movable carts 22, 22 arranged at both ends in the X direction
Since it is supported by (21, 21), a horizontal state can be maintained even when displaced. This is the same for the upper frame 13. When the track member 18 rises from the movable carriage 21 (22), the movable carriage 21 (22) abuts against the stopper 23.
It does not roll down the inclined surface 15a (16a).

When the intermediate frame 12 and the upper frame 13 are greatly displaced, the movable carriages 21, 22
Before the shaft comes off the track members 14 and 18, the regulating shaft 11c abuts on the inner peripheral surfaces of the regulating circles 12a and 13c. Therefore, the movable carts 21 and 22 do not come off the track members 14 and 18.

Next, another embodiment of the present invention will be described. In the following embodiment, only the configuration different from the above embodiment will be described. The configuration other than the description is the same as the above-described embodiment. Further, the embodiments can be combined with each other.

In the embodiment shown in FIGS. 9 and 10, the inclined surfaces 15a and 16a are arranged in parallel. That is, in this embodiment, a pair of track members 14A and 14B are used instead of the track member 14 of the above embodiment, and they are arranged in parallel with each other.
The upper surface of one track member 14A is a slope surface 14a that rises to the right.
, And the upper surface of the other track member 14B is a slope surface 14b that is inclined downward to the right. Concave portions 15 and 16 extending along the slope surfaces 14a and 14b are formed respectively.

Corresponding to the use of the pair of track members 14A and 14B, a pair of track members 18A and 18B are used instead of the track member 18 of the above embodiment. Each lower surface of the track members 18A, 18B is connected to a track member 14A,
Slope surface 18 corresponding to slope surface 14a, 14b of 14B
a, 18b. Concave portions 19 and 20 extending along the slope surfaces 18a and 18b are formed respectively.

A movable carriage 21 (only the rolling roller 21a is shown) is provided between the recesses 15 and 19, and a movable carriage 22 (only the rolling roller 22a is shown) is provided between the recesses 16 and 20. The rolling rollers 21a of the movable carriage 21 are
The rolling contact 22a of the movable carriage 22 is brought into contact with the bottom surfaces (inclined surfaces) 15a, 19a of the
Are in rolling contact with the respective bottom surfaces (inclined surfaces 16a, 20a). In addition, the movable carriages 21 and 22 are provided in the recesses 15 and 19, respectively.
There is provided a stopper (not shown) for preventing rolling down. Note that such a configuration is the same for the track members 24 and 28 provided on the intermediate frame 12 and the upper frame 13 in the above-described embodiment.

In this embodiment, a pair of track members 14A, 14B;
A, 16a; 19a, 20a are arranged in two rows in parallel, so that the length of the lower frame 11 and the intermediate frame 12 in the X direction can be made shorter than when they are arranged in one row. . In other words, when the lengths of the lower frame 11 and the intermediate frame 12 are the same as those in the above embodiment, the inclined surfaces 15a, 16a;
The length of “a” can be lengthened, whereby the maximum displacement of the intermediate frame 12 in the X direction can be increased. Of course, the maximum displacement of the upper frame 13 in the Y direction can be increased.

In the embodiment shown in FIG. 11, a pair of gradient surfaces 14a ', 14a ";18a',18a" is used instead of the gradient surfaces 14a, 18a of the above embodiment. The pair of sloped surfaces 14a ', 14a "has a downward slope inward so as to be generally concave. The pair of sloped surfaces 18a', 18a" is generally convex. , Descending inward. A concave portion 15 is formed on each of the inclined surfaces 14a 'and 14a ". A concave portion 19 is formed on each of the inclined surfaces 18a' and 18a". Recess 15,1
A movable carriage 21 (only the rolling rollers 21a are shown) is disposed between the nine carriages. Such a configuration is the same for the gradient surfaces 16 and 20 and the gradient surfaces formed on the track members 24 and 28 in the above-described embodiment. The slope 14
a ', 14a "are formed so as to be entirely convex.
The inclined surfaces 19a ', 19a "may be formed so as to be entirely concave. In this embodiment, the movable carts 21 and 22 may be arranged twice as in the above embodiment. As a result, a large load can be withstood, and a heavy object can be placed on the upper frame 13.

In the embodiment shown in FIG. 12, a ball 21a '(22a') made of a steel ball or the like is used in place of the rolling roller 21a (22a) of the above embodiment. Also, the recesses 15, 19 (16,
20) is formed into a right triangle in cross section, and its two side surfaces 1
5a ', 15a'; 19a ', 19a' (16a ', 1
6a ';20a', 20a ') are inclined surfaces.
In the case of this embodiment, since the rolling friction of the sphere 21a 'is smaller than that of the rolling roller 21a, the intermediate frame 12 and the upper frame 13 can be smoothly displaced.

The present invention is not limited to the above embodiment, but can be changed as appropriate. For example, in the above-described embodiment, the return means for positioning the intermediate frame 12 and the upper frame 13 at the initial positions is an inclined surface (for example, the inclined surfaces 15a, 16a, 19).
a, 20a) and the return spring 34 are used, but only one of them may be used. Return spring 3
When 4 is used, the inclined surface may be a horizontal surface. Also, the slope surfaces 14a, 14b, 18 of the track members 14, 18
Although the concave portions 15, 16, 19, and 20 are formed in the a and 18b, and the bottom surfaces thereof are the inclined surfaces 15a, 16a, 19a, and 20, the inclined surfaces 14a, 14b, 18a, and 18b may be used as the inclined surfaces. . In that case, between the lower frame 11 and the intermediate frame 12 and the intermediate frame 1
It is desirable to form a guide portion between the upper frame 13 and the upper frame 13 for guiding relative displacement and preventing displacement in a direction perpendicular to the relative displacement direction.

[0034]

As described above, according to the first aspect of the present invention, it is possible to increase the maximum displacement of the intermediate frame and the upper frame without increasing the size of the seismic isolation table. Can be According to the second aspect of the invention, an effect that a large load can be endured is obtained. According to the third aspect of the invention, there is obtained an effect that a larger load can be withstood. Claim 4
According to the invention, the effect that the upper frame and the lower frame can be returned to the initial position by their own weight can be obtained. According to the fifth aspect of the present invention, an effect is obtained that a larger load can be endured.
According to the invention according to claim 6, an effect is obtained that a pair of inclined surfaces can be formed in one track member. According to the invention according to claim 7, an effect is obtained that the maximum displacement amount of the intermediate frame and the upper frame can be further increased. According to the invention according to claim 8,
The effect that the rolling element can be prevented from rolling down the inclined surface can be obtained.

[Brief description of the drawings]

FIG. 1 is an enlarged sectional view taken along line XX of FIG. 2 showing one embodiment of the present invention, and FIG. 1 (A) shows a state where an intermediate frame is located at an initial position, and FIG. 3) shows a state in which the intermediate frame is displaced in the X direction.

FIG. 2 is a plan view of the embodiment.

FIG. 3 is a sectional view taken along line XX of FIG. 2;

FIG. 4 is a sectional view showing a main part of the embodiment.

FIG. 5 is a sectional view taken along line XX of FIG. 4;

FIG. 6 is a sectional view taken along line YY of FIG. 5;

7A and 7B are views showing the mounting structure of the decorative board of the embodiment, and FIG. 7A is an enlarged view of a part of FIG.
FIG. 7B is a sectional view taken along line BB of FIG.

FIG. 8 is a diagram showing a relationship between the track members 14, 18 and the movable carts 21, 22. FIG. 8A shows a state where the intermediate frame is located at the initial position, and FIG. ) Shows a state in which the intermediate frame is displaced in the X direction.

FIG. 9 is a diagram showing a main part of another embodiment of the present invention.
It is a figure similar to (A).

FIG. 10 is a sectional view taken along line XX of FIG. 9;

FIG. 11 is a sectional view similar to FIG. 6, showing a main part of still another embodiment of the present invention.

FIG. 12 shows a main part of another embodiment of the present invention.
It is sectional drawing similar to.

FIG. 13 is a diagram showing an example of a conventional seismic isolation table, and FIG.
3 (A) is a plan view thereof, and FIG. 13 (B) is a side view thereof.

14 is a view showing a state in which the intermediate frame has relatively moved with respect to the lower frame in the seismic isolation table shown in FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Seismic isolation base 11 Lower frame 12 Intermediate frame 13 Upper frame 14 Track material 15a Inclined surface 15a 'Inclined surface 16a Inclined surface 16a' Inclined surface 18 Track material 19a Inclined surface 19a 'Inclined surface 20a Inclined surface 20a' Inclined surface 21a Rolling Roller (rolling member) 21a 'Spherical member (rolling member) 22a Rolling roller (rolling member) 22a' Spherical member (rolling member) 23 Stopper

Claims (8)

[Claims] 1. A lower frame, an intermediate frame, and an upper frame which are sequentially arranged from bottom to top, wherein when two horizontal directions orthogonal to each other are defined as an X direction and a Y direction, the intermediate frame is connected to the lower frame. X on frame
In the seismic isolation table supported movably in the direction and the upper frame supported movably in the Y direction by the intermediate frame, a rolling element is provided between the lower frame and the intermediate frame for rolling contact with the lower frame and the intermediate frame. By providing a rolling element rolling between the intermediate frame and the upper frame, the intermediate frame is movably supported by the lower frame, and the upper frame is movably supported by the intermediate frame. Characteristic seismic isolation table. 2. The seismic isolation table according to claim 1, wherein the rolling element is a rolling roller. 3. The seismic isolation table according to claim 1, wherein a plurality of the rolling elements are formed as a set, and the set of the rolling elements is rotatably supported by a retainer. 4. A pair of inclined surfaces forming an upward gradient and a downward gradient in one of the X directions on the upper surface of the lower frame are formed on two sides of a virtual quadrilateral extending in the X direction. Along and two pairs apart in the X direction,
On the lower surface of the intermediate frame, an inclined surface that is vertically opposed to each inclined surface of the lower frame, and that is inclined in the same direction is provided, and the inclined surface between the opposed lower surfaces of the lower frame and the intermediate frame is provided. Rolling elements are arranged,
On the upper surface of the intermediate frame, a pair of inclined surfaces forming an upward gradient and a downward gradient in one of the Y directions is along two sides of the virtual quadrilateral extending in the Y direction, and Two pairs are provided apart from each other in the direction, and a lower surface of the upper frame is provided with an inclined surface that is vertically opposed to each inclined surface of the intermediate frame, and that is inclined in the same direction. The seismic isolation table according to any one of claims 1 to 3, wherein the rolling elements are arranged between inclined surfaces facing each other. 5. The seismic isolation table according to claim 4, wherein the inclined surface is formed in a V-shaped cross section by a pair of guide surfaces, and the rolling elements are arranged on each guide surface. 6. The base isolation table according to claim 4, wherein the pair of inclined surfaces are arranged in a line. 7. The base isolation table according to claim 4, wherein the pair of inclined surfaces are arranged in two rows. 8. A stopper provided on the upper surface of the lower frame and on each of the inclined surfaces provided on the upper surface of the intermediate frame for preventing the rolling elements disposed on the respective inclined surfaces from rolling downward. The seismic isolation table according to any one of claims 4 to 7, which is provided respectively.