JPH11247925A - Base isolation table - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To provide a seismic isolation table that does not reduce the seismic isolation effect even when the amplitude is large, and that can reliably return the intermediate frame and upper frame that have moved relatively to the initial position. I do. An X-direction support mechanism (5) for supporting an intermediate frame (3) movably in an X direction with respect to a lower frame (2) comprises a rail (51) and a bogie (52). On the upper surface of the rail 51, a guide groove 53 is formed in one half of one end in the longitudinal direction, and a guide groove 54 is formed in the other half of the other end. The bottom surfaces 53a, 54a of the guide grooves 53, 54 are inclined at a fixed angle and in opposite directions. Rolling roller 5 of carriage 52
5 is rolled on the bottom surfaces 53a and 54a. The Y-direction support mechanism 6 that supports the upper frame 4 so as to be movable in the Y direction with respect to the intermediate frame 3 is configured similarly to the X-direction support mechanism 5.

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 display case or the like from rolling.

[0002]

2. Description of the Related Art Generally, a seismic isolation table of this type includes a lower frame, an intermediate frame, and an upper frame which are sequentially arranged from bottom to top, and two directions orthogonal to each other in a horizontal plane are defined as an X direction and a Y direction. In this case, the intermediate frame is supported by the lower frame via a supporting mechanism so as to be movable in the X direction, and the upper frame is supported by the intermediate frame so as to be movable in the Y direction via the supporting mechanism.

FIG. 15 shows an example of an X-direction support mechanism used in a conventional seismic isolation table.
The direction support mechanism a includes a rail a provided on the lower frame b.
_1, and a truck a ₂ provided on the intermediate frame c. On the upper surface of the rail a _1, the rolling surface a ₃ formed of circularly arcuate surfaces are formed. Rolling elements a ₄ of the rolling surface a ₃ bogie a ₂
Rolls. As a result, the intermediate frame c can be moved relative to the lower frame b in the X direction. When the intermediate frame c is located at the initial position that does not move relative to the lower frame b, the rolling elements a ₄ is located at the center of the lowest position of the rolling surface a _3. Intermediate frame c
A Y-direction support mechanism (not shown) is provided between the upper frame (not shown) and the upper frame. This Y-direction support mechanism is configured similarly to the X-direction support mechanism a, except that the rail is provided along the Y direction.

In the seismic isolation table having the X-direction support mechanism a and the Y-direction support mechanism having the above structure, when the lower frame b moves in the X and Y directions due to an earthquake or the like, the intermediate frame c is moved in the X direction. The upper frame relatively moves in the direction opposite to the lower frame b, and the upper frame relatively moves in the direction opposite to the lower frame b and the intermediate frame c in the Y direction. Therefore, the upper frame hardly moves in the X direction and the Y direction. Therefore, the display case or the like placed on the seismic isolation table does not roll.

[0005] When the intermediate frame c and the upper frame are relatively moved from the initial position, the rolling element a ₄ increases rolling raceways a ₃ in accordance with the relative movement distance. Therefore, when the lower frame b stops, rolling elements a ₄ descends rolling raceways a _3. Thereby, the intermediate frame c and the upper frame are returned to the initial positions.

In the [0006] above-mentioned conventional MenShindai, rolling surface a ₃ is composed of a circular arc surface, the inclination angle of the rolling surface a ₃ is larger at both ends, rolling elements a ₄
Becomes less up roll toward the opposite ends of the rolling surface a _3, resistance to the relative movement of the intermediate frame c and the upper frame is increased. Therefore, when the intermediate frame c and the upper frame relatively move relatively, as in the case of an earthquake having a large amplitude, there is a problem that the seismic isolation effect is reduced. Further, the vicinity of the center portion of the rolling surface a ₃ is almost horizontal, have little effect of lowering rolling the rolling elements a _4. For this reason, there is a problem that the intermediate frame c and the upper frame, which have relatively moved, are stopped with a slight shift from the initial position.

[0006]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and the invention according to claim 1 is a lower frame which is sequentially arranged from bottom to top,
When an intermediate frame and an upper frame are provided, and two directions orthogonal to each other in a horizontal plane are defined as an X direction and a Y direction,
A seismic isolation device in which the intermediate frame is supported by the lower frame via an X-direction support mechanism so as to be movable in the X direction, and the upper frame is supported by the intermediate frame so as to be movable in the Y direction via a Y-direction support mechanism. In the table, the X-direction support mechanism is provided on one of the lower frame and the intermediate frame, and at a certain angle with respect to the X direction, and a pair of X-direction inclined surfaces inclined in opposite directions to each other. An X-direction rolling element that is fixedly provided on the other side and rolls on the pair of inclined surfaces, and the Y-direction support mechanism is provided on one of the intermediate frame and the upper frame. ,
It has a pair of Y-direction inclined surfaces that are inclined at a fixed angle to the Y-direction and opposite to each other, and a Y-direction rolling element that is provided at the other position and fixed and that rolls on the pair of inclined surfaces. It is characterized by doing.

In this case, the pair of inclined surfaces in the X direction are arranged in a straight line in the X direction and adjacent ends are arranged so as to be continuous with each other. May be arranged in a straight line in the direction, and adjacent ends may be arranged so as to be continuous with each other,
Alternatively, the pair of X-direction inclined surfaces are arranged in a straight line in the X direction, and the adjacent ends are arranged so as to be separated from each other, and the pair of Y-direction inclined surfaces are arranged in a straight line in the Y direction, and Adjacent ends may be arranged so as to be separated from each other.
The two pairs of the inclined surfaces in the Y direction may be arranged in two rows so as to be adjacent to each other in the X direction.

When the pair of X-direction inclined surfaces and the pair of Y-direction inclined surfaces are arranged in a straight line and are continuous with each other, the pair of X-direction inclined surfaces and the pair of Y-directional inclined surfaces are Each may be formed in a concave shape as a whole, or may be formed in a convex shape as a whole. When the pair of X-direction inclined surfaces and the pair of Y-direction inclined surfaces are formed in a concave shape as a whole, when the intermediate frame is located at an initial position, the X-direction rolling element is moved to the pair of X-direction inclined surfaces. When the upper frame is located at the initial position, the Y-direction rolling element is desirably located at a continuous position between the pair of Y-directional inclined surfaces.

A plurality of the X-direction rolling elements are used so as to roll the pair of X-direction inclined surfaces, and a plurality of the Y-direction rolling elements are used so as to roll the pair of Y-direction inclined faces. May be used.

The pair of X-direction inclined surfaces are respectively formed on the bottom surfaces of a pair of X-direction guide grooves extending in the X direction, and the X-direction rolling elements are rolled in the X-direction guide grooves to move in the Y direction. , The pair of Y-direction inclined surfaces are formed on the bottom surfaces of a pair of Y-direction guide grooves extending in the Y direction, and the Y-direction rolling elements are rolled in the Y-direction guide grooves. It is desirable to prevent movement in the direction.

An X-direction ridge extending in the X-direction is formed on one of the lower frame and the intermediate frame, and the X-direction inclined surface is formed on a facing surface facing the other of the X-direction ridges. A Y-direction ridge extending in the Y direction is formed on one of the intermediate frame and the upper frame.
The Y-direction inclined surface may be formed on an opposing surface opposing the other of the direction protrusions. In that case, a flange portion is formed on at least one side of the X-direction rolling element to prevent the X-direction rolling element from moving in the Y direction by contacting the side surface of the X-direction ridge, It is desirable to form a flange on at least one side of the Y-direction rolling element to prevent the Y-direction rolling element from moving in the X direction by contacting the side surface of the Y-direction ridge.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to FIGS. 1 to 4 show a seismic isolation table 1 according to a first embodiment of the present invention. As shown in FIG. 2, the seismic isolation table 1 is mounted on a floor F or another installation table or the like. Mounted or fixed on The display case C is placed or fixed on the seismic isolation table 1. Of course, something other than the display case C may be placed.

As shown in FIG. 1, the seismic isolation table 1 includes a lower frame 2, an intermediate frame 3 and an upper frame 4, which are sequentially arranged from bottom to top. These frames 2 to 4 have a square plate shape, but may have other shapes. The frames 2 to 4 have their centers aligned in the horizontal direction during normal times when no external force due to an earthquake or the like is applied. Hereinafter, the position of the intermediate frame 3 when the center of the lower frame 2 matches the center of the intermediate frame 3 and the position of the upper frame when the center of the intermediate frame 3 matches the center of the upper frame 4 are respectively initialized. Called position.

When two directions orthogonal to each other in the horizontal plane are defined as an X direction and a Y direction, the intermediate frame 3 is supported between the lower frame 2 and the intermediate frame 3 so as to be movable in the X direction with respect to the lower frame 2. An X-direction support mechanism 5 is provided. Four X-direction support mechanisms 5 are used. The two X-direction support mechanisms 5 are arranged on one end and the other end of the lower frame 2 and the intermediate frame 3 along one of two sides parallel to the X direction.
The other two X-direction support mechanisms 5 are respectively arranged on one end side and the other end side along the other side. And
The intermediate frame 3 is provided by these four X-direction support mechanisms 5.
Are supported movably in the X direction with respect to the lower frame 2.

Between the intermediate frame 3 and the upper frame 4, a Y-direction support mechanism 6 for supporting the upper frame 4 so as to be movable in the Y direction with respect to the intermediate frame 3 is provided.
Four Y-direction support mechanisms 6 are used. The two Y-direction support mechanisms 6 are provided for the intermediate frame 3 and the upper frame 4.
It is arranged at one end and the other end along one of the two sides parallel to the direction. The other two Y-direction support mechanisms 6 are arranged at one end and the other end, respectively, along the other side. The upper frame 4 is supported by the four Y-direction support mechanisms 6 so as to be movable in the Y direction with respect to the intermediate frame 3.

The X-direction support mechanism 5 includes a rail 51 and a bogie 5
And 2. The rail 51 is fixed to the upper surface of the lower frame 2 with its longitudinal direction oriented in the X direction. On the upper surface of the rail 51, slope surfaces 51a and 51b are formed on one half and the other half in the longitudinal direction, respectively. The slope 51a has a downward slope from one end of the rail 51 toward the center, and the slope 51b has a downward slope from the other end of the rail 51 toward the center. That is, the inclined surfaces 51a and 51b are inclined in opposite directions. Moreover, each of the gradient surfaces 51a, 51
They are inclined at the same constant angle with each other,
1 are continuous with each other at the center. As a result, when viewed from the Y direction, the upper surface of the rail 51 has a concave shape as a whole such that the central portion is recessed from both ends.

A guide groove 53 extending from one end to the other end is formed on the inclined surface 51a. A guide groove 54 extending from one end to the other end is formed on the inclined surface 51b. The pair of guide grooves 53 and 54 is
a, 51b are formed in parallel with each other. Therefore, the bottom surfaces 53a and 54a (see FIG. 4) of the guide grooves 53 and 54 also have the same inclination angle and the opposite inclination directions. The bottom surfaces 53a and 54a constitute a pair of inclined surfaces of the present invention. Therefore, in the following, the bottom surfaces 53a and 54a are referred to as inclined surfaces 53a and 54a. The guide grooves 53 and 54 have the same cross-sectional shape, and are continuous with each other at the center of the rail 51. Therefore, the inclined surfaces 53a and 54a are also continuous with each other, and have a concave shape in which the central portion is recessed from both ends as a whole.

As shown in FIG. 3 and FIG.
2 is fixed to the lower surface of the intermediate frame 3. A rolling roller (rolling element) 55 is rotatably provided on the carriage 52 via a shaft 56. This rolling roller 55
The lower side thereof enters the guide groove 53 or the guide groove 54, and rolls on the inclined surfaces 53a, 54a.
The width of the rolling roller 55 is substantially the same as the width of the guide grooves 53 and 54. Therefore, the rolling roller 55 cannot move in the Y direction. This prevents the intermediate frame 3 from moving in the Y direction with respect to the lower frame 2. Further, when the intermediate frame 3 is located at the initial position, the rolling roller 55 is located in the middle of the inclined surfaces 53a, 54a, that is, at the continuous portion of the inclined surfaces 53a, 54a. Therefore, when the intermediate frame 3 is located at the initial position, the rolling roller 55 is driven by the inclined surfaces 53a, 54a.
Are in contact with both. Of course, when the intermediate frame 3 is moved, the rolling roller 55 becomes the inclined surface 53a and the inclined surface 54a.
Contact only with either one of

The Y-direction support mechanism 6 also has a rail and a bogie, and its structure is such that the rail is arranged parallel to the Y-direction, and thus the bogie moves in the Y-direction. Similar to the mechanism. Therefore, in the Y-direction support mechanism 6, the same components as those in the X-direction support mechanism 5 are denoted by the same reference numerals, and description thereof is omitted. This applies to each of the embodiments described later.

In the seismic isolation table 1 having the above structure, the pair of inclined surfaces 53a and 54a are inclined at a fixed angle, and the inclination angle of the pair of inclined surfaces 53a and 54a is set at the center of the rail 51 or at both ends. Are identical. Therefore, even if the intermediate frame 3 and the upper frame 4 are relatively moved relatively, the seismic isolation effect does not decrease, and a constant seismic isolation effect is always obtained. Further, since the pair of inclined surfaces 53a and 54a have a constant inclination angle even in the center of the rail 51, the intermediate frame 3 and the upper frame 4 which have been relatively moved can always be returned to the initial positions.

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, and the same components as those in the above embodiment will be denoted by the same reference numerals and description thereof will be omitted.

FIG. 5 shows a second embodiment of the present invention. In this embodiment, the rail 51 is fixed to the lower surface of the intermediate frame 3, and the carriage 52 is fixed to the upper surface of the lower frame 2. Correspondingly, guide grooves 53 and 54 are formed on the lower surface of the rail 51, and a rolling roller 55 is provided above the carriage 52.

FIG. 6 shows a third embodiment of the present invention. In the seismic isolation table 1 of this embodiment, two carriages 52 are used for one X-direction support mechanism 5. Each of the carts 52 is arranged such that when the intermediate frame 3 is located at the initial position, the respective rolling rollers 55 are located at the longitudinal center portions of the guide grooves 53, 54, respectively. .

In the seismic isolation table 1 shown in FIG. 6, when the intermediate frame 3 is located at the initial position, the rolling rollers 55 of the carriages 52 of the X-direction support mechanism 5 have inclined surfaces 53a. , 54a. However, when the intermediate frame 3 moves relatively, for example, the intermediate frame 3
6 moves rightward in FIG. 6 from the initial position, as shown in FIG. 7, only the rolling roller 55 of the right bogie 52 comes into contact with the inclined surface 54a, and the rolling roller 55 of the left bogie 52 becomes , Rising from the inclined surface 53a. Conversely, when the intermediate frame 3 moves to the left, the rolling roller 55 of the left bogie 52 only comes into contact with the inclined surface 53a, and the rolling roller 55 of the right bogie 52 rises from the inclined surface 54a. Such an operation is achieved by a pair of inclined surfaces 53a, 54a.
The same applies to the following embodiments in which the carts 52 are respectively arranged.

FIG. 8 shows a fourth embodiment of the present invention. In this embodiment, the slope 51
a, 51b are inclined so as to form an upward gradient from both ends of the rail 51 toward the center. Correspondingly,
The guide grooves 53 and 54 and the inclined surfaces 53a and 54a are also inclined upward from both ends of the rail 51 toward the center. As a result, the pair of inclined surfaces 53a and 54a are convex as a whole when viewed from the Y direction.

FIG. 9 shows a fifth embodiment of the present invention. In this embodiment, the rail 51
Is divided into two at the center, and is constituted by two rail halves 51A and 51B. The rail halves 51A and 51B are arranged slightly apart in the X direction. The guide groove 53 and the inclined surface 53a are formed in the rail half 51A, and the guide groove 54 and the inclined surface 54a are inclined in the rail half 51B. The rail halves 51A and 51B are arranged so as to be in contact with each other, thereby connecting the guide grooves 53 and 54, and
The inclined surfaces 53a and 53b may be continuous.

FIGS. 10 and 11 show a sixth embodiment of the present invention. In this embodiment, as in the embodiment shown in FIG. 9, the rail 51 is divided into two rail halves 51A and 51B. However, in this embodiment, the rail halves 51A and 51B are not arranged in a straight line, but are arranged in parallel. In other words, the rail halves 51A and 51B are arranged in two rows slightly apart in the Y direction, and are arranged at the same position in the X direction. The rail halves 51A and 51B may be arranged in contact with each other.

In this embodiment, since the two rail halves 51A and 51B are arranged in two rows, compared to the case where the rail halves 51A and 51B are arranged in one row, the rail halves 51A and 51B are arranged in a single row. The length can be doubled. Therefore, the movable range of the intermediate frame 3 and the upper frame 4 can be increased, and it is possible to cope with an earthquake having a large amplitude. In other words, since the length of the rail 51 can be reduced to half, the X of the lower frame 2, the intermediate frame 3 and the upper frame 4 is smaller than when the rail halves 51A and 51B are arranged in a line. , Y length can be reduced by half, and the seismic isolation table can be downsized.

FIG. 12 shows a seventh embodiment of the present invention. In this embodiment, two rolling rollers 55 are provided on one carriage 52. Of course, three or more rolling rollers 55 may be provided on one carriage 52. As described above, when a plurality of rolling rollers 55 are provided on one carriage 52, the load of the display case C acting on each rolling roller 55 is reduced, so that a large display case can be supported.

FIG. 13 shows an eighth embodiment of the present invention. In this embodiment, the guide groove 5
3, 54 are formed in a semicircular cross section. Of course, the inclined surfaces 53a and 54a are also semicircular in cross section. Correspondingly, the outer peripheral portion of the rolling roller 55 is formed in a semicircular cross section.

FIG. 14 shows a ninth embodiment of the present invention. In this embodiment, no guide groove is formed on the upper surface of the rail (protrusion) 51. For this reason, the rolling roller 55 may move in the Y direction and come off the rail 51. Therefore, the width of the rolling roller 55 is made substantially the same as that of the rail 51, and flange portions 55a, 55a are formed on both sides of the rolling roller 55, and the flange portions 55a, 55a are brought into contact with both side surfaces of the rail 51, respectively. This prevents the rolling roller 55 from moving in the Y direction.

The flange 55a need not necessarily be formed on both sides of the rolling roller 55, but may be formed only on one side. However, in this case, the flanges 5 are provided on the opposite sides of each of the rolling rollers 55 of the two carriages 52, 52 which are arranged apart in the Y direction.
5a must be formed. Specifically, FIG.
If a flange 55a is formed on the left side (right side) of the rolling roller 55 of the left bogie 52 of FIG. 4, the right side (left side) of the rolling roller 55 of the right bogie 52 is formed with a flange. 55a are formed.

The present invention is not limited to the above embodiment, but can be changed as appropriate. For example, in the above-described embodiment, the X-direction support mechanism 5 and the Y-direction support mechanism 6 having the same structure are used, but different structures may be used. Further, although the rolling roller 55 is used as the rolling element, a spherical body may be used.

[0034]

As described above, according to the first to eleventh aspects of the present invention, a constant seismic isolation effect is always obtained even when the intermediate frame and the upper frame are relatively moved relatively, so that the amplitude It can fully cope with large earthquakes. Further, there is an effect that the intermediate frame and the upper frame that have been relatively moved can be reliably returned to the initial position. In particular, according to the invention according to claim 7, the relative movable range of the intermediate frame and the upper frame can be increased, whereby it is possible to cope with an earthquake having an even greater amplitude. Can be reduced in size. Claim 9,
According to the eleventh aspect, an effect is obtained that the intermediate frame can be reliably prevented from moving in the Y direction and the upper frame can be reliably prevented from moving in the X direction.

[Brief description of the drawings]

FIG. 1 is a view showing an embodiment of the present invention, FIG. 1 (A) is a plan view thereof, and FIG. 1 (B) is a view showing a state in which an intermediate frame is located at an initial position. ) View from arrow B,
FIG. 1C is a view similar to FIG. 1B showing a state in which the intermediate frame has moved relative to the lower frame.

FIG. 2 is a front view showing a display case placed on the seismic isolation table shown in FIG. 1;

FIG. 3 is an enlarged view of a circle part of FIG. 1 (B).

FIG. 4 is an enlarged sectional view taken along line PP of FIG. 3;

FIG. 5B shows a second embodiment of the present invention.
FIG.

FIG. 6 shows a third embodiment of the present invention.
FIG.

FIG. 7 is a diagram showing a state in which the intermediate frame has relatively moved with respect to the lower frame in the embodiment shown in FIG. 6;

FIG. 8 shows a fourth embodiment of the present invention.
FIG.

FIG. 9 (B) shows a fifth embodiment of the present invention.
FIG.

FIG. 10 is a partially omitted plan view showing a sixth embodiment of the present invention, and in FIG. 10, an intermediate frame and an upper frame are removed.

FIG. 11 is a view as viewed in the direction of the arrow Q in FIG. 10;

FIG. 12 shows a seventh embodiment of the present invention.
FIG. 12B is a view similar to FIG. 12B, and the upper frame and the Y-direction support mechanism are removed in FIG. 12.

FIG. 13 is a sectional view of a rail and a bogie according to an eighth embodiment of the present invention.

FIG. 14 is a partially omitted side view showing the ninth embodiment of the present invention viewed from the Y direction in FIG. 1, and the upper frame and the Y direction support mechanism are removed in FIG.

FIG. 15 is a front view showing a conventional seismic isolation table without an upper frame and a support mechanism for supporting the upper frame.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Seismic isolation table 2 Lower frame 3 Intermediate frame 4 Upper frame 5 X-direction support mechanism 6 Y-direction support mechanism 51 Rail (projection) 53 Guide groove 53a Bottom of guide groove (inclined surface) 54 Guide groove 54a Bottom of guide groove ( Slope) 55 Rolling roller (rolling element) 55a Flange

Claims (11)

[Claims] 1. An intermediate frame, comprising: a lower frame, an intermediate frame, and an upper frame which are sequentially arranged from bottom to top, wherein two directions orthogonal to each other in a horizontal plane are defined as an X direction and a Y direction. A seismic isolation table supported on the lower frame movably in the X direction via an X-direction support mechanism, and the upper frame supported on the intermediate frame movably in the Y direction via a Y-direction support mechanism, An X-direction support mechanism is provided on one of the lower frame and the intermediate frame, and has a pair of X-direction inclined surfaces that are inclined at a certain angle with respect to the X direction and are opposite to each other, and are located on the other side. An X-direction rolling element that is fixedly provided and rolls on the pair of inclined surfaces, the Y-direction support mechanism is provided on one of the intermediate frame and the upper frame, and It has a pair of Y-direction inclined surfaces inclined at opposite angles to each other at a fixed angle to each other, and a Y-direction rolling element that is fixedly provided on the other and that rolls on the pair of inclined surfaces. A seismic isolation table characterized by the following. 2. The pair of X-direction inclined surfaces are arranged in a straight line in the X-direction, and adjacent ends are arranged so as to be continuous with each other, and the pair of Y-direction inclined surfaces are straight in the Y direction. 2. An end which is arranged on a line and which is adjacent to each other and adjacent to each other.
Seismic isolation table described in. 3. The pair of X-direction inclined surfaces are formed so as to be entirely concave so that a central portion is depressed from both ends when viewed from the Y direction, and the pair of Y-direction inclined surfaces are viewed from the X direction. The seismic isolation table according to claim 2, wherein the central portion is formed as a whole so as to be concave from both ends. 4. When the intermediate frame is located at an initial position without moving with respect to the lower frame, the X-direction rolling element is located at a continuous portion of the pair of X-direction inclined surfaces, and The seismic isolation table according to claim 3, wherein when the frame is located at the initial position, the Y-direction rolling element is located at a continuous portion of the pair of Y-direction inclined surfaces. 5. The pair of X-direction inclined surfaces are formed so as to be entirely convex so that a central portion projects from both ends when viewed from the Y direction, and the pair of Y-direction inclined surfaces are formed from the X direction. The seismic isolation table according to claim 2, wherein the seismic isolation table is formed so as to have a central portion projecting from both end portions when viewed. 6. The pair of X-direction inclined surfaces are arranged in a straight line in the X-direction, and adjacent end portions are arranged so as to be separated from each other, and the pair of Y-direction inclined surfaces are formed in a straight line in the Y-direction. The seismic isolation table according to claim 1, wherein adjacent end portions are arranged so as to be separated from each other. 7. The pair of Y-direction inclined planes are arranged in two rows so as to be adjacent to each other in the Y-direction.
The seismic isolation table according to claim 1, wherein the direction inclined surfaces are arranged in two rows so as to be adjacent to each other in the X direction. 8. A plurality of said X-direction rolling elements are used to roll on said pair of X-direction inclined surfaces, respectively, and a plurality of said Y-direction rolling elements are rolled on said pair of Y-direction inclined surfaces. Claim 3, characterized in that it is used
Seismic isolation table described in any of 5, 6, and 7. 9. A pair of X-direction inclined surfaces are formed on the bottom surfaces of a pair of X-direction guide grooves extending in the X direction, respectively, and the X-direction rolling element rolls in the X-direction guide grooves to form a Y-direction. And the pair of Y-direction inclined surfaces are formed on the bottom surfaces of a pair of Y-direction guide grooves extending in the Y direction, respectively, and the Y-direction rolling elements roll in the Y-direction guide grooves. The seismic isolation table according to any one of claims 1 to 8, wherein movement in the X direction is prevented by this. 10. An X-direction ridge extending in the X direction is formed on one of the lower frame and the intermediate frame,
The X-direction sloping surface is formed on an opposing surface facing the other of the X-direction ridges, and a Y-direction ridge extending in the Y direction is formed on one of the intermediate frame and the upper frame. The said Y direction inclination surface is formed in the opposing surface which opposes the other of a ridge, The Claim 1 characterized by the above-mentioned.
Seismic isolation table described in any of 9 above. 11. A flange portion is formed on at least one side of the X-direction rolling element to prevent the X-direction rolling element from moving in the Y direction by contacting a side surface of the X-direction ridge. In addition, at least one side of the Y-direction rolling element is provided with a flange portion that contacts the side surface of the Y-direction ridge to prevent the Y-direction rolling element from moving in the X direction. The seismic isolation table according to claim 10, characterized in that: