JP2015017638A - Base isolation support device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a base isolation support device that can be installed by utilizing a building floor etc., where a base isolation support object such as furniture including a display rack and a book shelf is installed as it is, and can easily make cycles longer.SOLUTION: A base isolation support device 1 includes: a support body 8 which is fixed to an outer case 4 of furniture 3 and also has an arcuately-sectioned convex outer surface 7 so as to bear the load of the furniture 3 to be supported on a floor 2 in a vertical direction V; and a rotary body 12 which is in a shape complementary to the arcuately-sectioned convex outer surface 7 of the support body 8, has an arcuately-sectioned concave outer surface 9 brought into contact with the arcuately-sectioned convex outer surface 7 at the same position as a center O1 as the center of curvature slidably in an R direction around the center O1 and also has an arcuately-sectioned convex outer surface 11, having a center O2 as the center of curvature, brought into contact with a flat surface 10 of the floor 2 around the center O2 rotatably in the R direction, and bears the load of the furniture 3 in the vertical direction V together with the support body 8.

Description

  The present invention relates to an eccentric rolling pendulum type seismic isolation support device.

  In order to provide seismic isolation support for fixtures such as display stands, bookcases, etc., a sliding seismic isolation support device using a sliding plate or a sliding surface, a rolling seismic isolation support device using a rolling member, or the like is used.

Japanese Patent Laid-Open No. 7-310459

  By the way, the sliding seismic isolation support device, the rolling seismic isolation support device, and the like have no restoring force, and after the vibration, it is necessary to restore the original position by pushing the furniture, the bookshelf, etc. manually.

  In order to eliminate such a complicated and forceful return operation, for example, the pendulum type seismic isolation device described in Patent Document 1 has been proposed. Is formed with a gentler curvature than the curved surface of the lower surface of the rotating body, and the period of the seismic isolation device is determined by the radius of curvature of the curved surface of the lower surface.

  However, since the pendulum type seismic isolation device described in Patent Document 1 requires a support base having a concave portion, a fixture such as a display stand, a building floor on which a book shelf, etc. are installed is directly attached to the seismic isolation device. In order to increase the period of such a pendulum type seismic isolation device in order to cope with long-period earthquakes, a large support base is required, and as a result, installation targets are limited.

  The present invention has been made in view of the above-mentioned points, the purpose of which can be installed as it is, such as fixtures such as display stands, building floors on which seismic isolation support objects such as bookshelves are installed, It is an object of the present invention to provide a seismic isolation support device that can easily increase the period.

  The seismic isolation support device of the present invention is fixed to one of the ground or base and the base isolation support object so as to receive the load of the base isolation support object to be supported on the ground or base. And a support body having a convex outer surface with a first cross-section arc, and a cross-section arc concave outer surface that slidably contacts the first cross-section arc convex outer surface of the support body, while the ground or base and A rotating body that is configured to freely contact the flat surface of the other of the seismic support objects at the convex outer surface of the second cross-section arc and that receives the load of the seismic isolation support object together with the support body. The rotating body is rotatable about the center of curvature of the outer surface of the circular arc concave section of the rotating body with respect to the support, and the second outer surface of the circular arc of the rotating body is concave to the circular arc section of the rotating body. Has a radius of curvature larger than the radius of curvature of the outer surface, and is stationary The center of curvature of the convex outer surface of the second cross-sectional arc of the rotating body is perpendicular to the center of curvature of the concave outer surface of the cross-sectional arc of the rotating body on one side of the ground or base and the base isolation support object Is located eccentrically.

  According to the seismic isolation support device of the present invention, the rotating body has a cross-section arc convex outer surface adapted to freely contact a flat surface in the other of the ground or the base and the base isolation support object, The rotating body can rotate with respect to the support centering on the center of curvature of the concave outer surface of the circular arc of the rotating body, and the convex outer surface of the second circular arc of the rotating body is more than the radius of curvature of the concave outer surface of the circular arc of the rotating body. In the stationary state, the center of curvature of the convex outer surface of the second cross-sectional arc of the rotating body is perpendicular to the center of curvature of the outer surface of the concave arc of the rotating body. As a result of being located eccentrically on one side of the seismic support object, it is possible to install it as it is, such as a display floor or other fixtures, a building floor where bookcases are installed, etc. , The cross-section of the rotating body in a stationary state In order to be able to determine in eccentricity in the vertical direction between the center of curvature and the center of curvature of the arcuate sectional 凹外 surface of the rotating body, may work to readily long period of.

  In the present invention, the seismic isolation support object to be supported includes furniture such as a display stand such as a store, a book shelf such as an office, a library or a general house, office equipment, a factory machine and a machine bed. , Hospital examinations, diagnostic equipment, small warehouses, etc., but the present invention is not limited to these, and the base is a foundation floor built in the ground, a store, an office, a library, etc. Or the floor of structures, such as a general house, a hospital, a warehouse, etc. can be mentioned, but this invention is not limited to these.

  In the present invention, the first cross-section arc convex outer surface of the support body and the cross-section arc concave outer surface and the second cross-section arc convex outer surface of the rotating body are part of a cylindrical surface or part of a spherical surface. If it consists of a part of a cylindrical surface, it can give directionality to the seismic isolation effect, and if it consists of a part of a spherical surface, it can resist vibrations in all directions of the horizontal plane. Can exhibit seismic isolation effect. When giving directionality to the seismic isolation effect, it is not necessary to configure all of the first cross-section arc convex outer surface of the support body and the cross-section arc concave outer surface and second cross-section arc convex outer surface of the rotating body from a part of the cylindrical surface. Any one of them may be constituted by a part of the cylindrical surface.

  Trigger function (function that does not slide at vibration acceleration below a certain level, and causes sliding at a certain level or higher) And if it does not require vibration damping function (function to dissipate vibration as heat and absorb vibration energy that causes sliding during sliding), it should have a surface with a very small friction coefficient. On the other hand, when the trigger function and the vibration damping function are required, the surface should have a moderate coefficient of friction. If the trigger function is provided, the vibration acceleration of the ground or base will be small. If the vibration isolation function is necessary, it is possible to avoid unnecessary and sensitive relative vibration of the base isolation support object by applying a small vibration acceleration to the base isolation support object. Relative vibration once It can be returned to the stationary state seismic isolation support object prematurely.

  On the other hand, the convex outer surface of the circular arc of the rotating body that serves as a rolling surface is moderate so that it does not slide easily against the ground or base or the flat surface of the base-isolated support object in a horizontal earthquake vibration. It preferably has a magnitude coefficient of friction.

  In a preferred example of the present invention, the first cross-section arc convex outer surface of the support has the same radius of curvature as that of the cross-section arc concave outer surface of the rotating body, in this case, the first cross-section of the support. The center of curvature of the arc convex outer surface and the cross-section arc concave outer surface of the rotating body may be located at the same position, and in another example, the first cross-section arc convex outer surface of the support is the section arc of the rotating body. The radius of curvature is smaller than the radius of curvature of the concave outer surface.

  In the present invention, the seismic isolation support device is stationary (the seismic isolation support object to be supported does not vibrate relative to the ground or the base in the horizontal direction, and the seismic isolation support device exhibits the seismic isolation function. In such a case, the center of curvature of the first cross-section arc convex outer surface of the support and the cross-section arc concave outer surface and the second cross-section arc convex outer surface of the rotating body may be located on the same vertical line.

  In the present invention, the entire rotating body may be made of a rigid member. However, the rotating body has a rigid body having an arc concave outer surface in cross section, and an elastic member fixed to the rigid body and having an arc convex outer surface in the second cross section. And, on the contrary, an elastic body having a cross-section arc concave outer surface, and a rigid body fixed to the elastic body and having a second cross-section arc convex outer surface. If the elastic body is interposed between the support and the flat surface in this way, the elastic body can absorb the vertical vibration of the ground or the base, and the seismic isolation support device. If the elastic body has a convex outer surface with a second cross-sectional arc, the triggering action can be obtained by a slight elastic deformation of the elastic body in a stationary state of Prevents unintentional slippage on the convex outer surface of the second cross-section arc The rotating body can be reliably rotated and rolled, and such an elastic body is applied to at least one of the main body portion and the sliding portion of the support body to You may enable it to absorb the vibration of the ground or a base in the vertical direction by elastic deformation of the body.

  The elastic body may be made of natural rubber, synthetic rubber or a synthetic resin material having elasticity. When the elastic body is made of natural rubber or synthetic rubber, the elastic body is fixed to the rigid body by vulcanization adhesion. However, it may be fixed to the rigid body using another adhesive.

  In the present invention, the support body may be fixed to the seismic isolation support object. In this case, the rotating body can freely roll on the ground surface or the flat surface of the base with the convex outer surface of the second cross section. The center of curvature of the convex outer surface of the second cross-sectional arc of the rotating body is eccentrically positioned in the vertical direction with respect to the center of curvature of the concave outer surface of the cross-sectional arc of the rotating body. Alternatively, the support body may be fixed to the ground or the base. In this case, the rotating body is flat on the seismic isolation support object with the convex outer surface of the second cross-section arc. The center of curvature of the convex outer surface of the second cross-sectional arc of the rotating body is decentered downward in the vertical direction with respect to the center of curvature of the concave outer surface of the arc of the rotating body. It only has to be located.

  The seismic isolation support device according to the present invention prohibits the rotation of the rotating body from the support by preventing the rotation of the rotating body beyond a certain level when the rotating body collides with the rotating body around the center of curvature of the concave outer surface of the circular arc. A separation prevention mechanism for preventing separation may further be provided, and the separation prevention mechanism may include a surrounding body that is attached to the support body and surrounds the rotating body. The surrounding body may have an inner surface with which the rotating body comes into contact in a rotation of a certain level or more around the center of curvature of the concave outer surface of the circular arc of the rotating body with respect to the support.

  In the seismic isolation support device equipped with the separation prevention mechanism, even if the rotating body is about to rotate greatly due to unintended large vibrations, the rotating body is prohibited from rotating beyond a certain level to prevent the rotating body from being detached from the support body. As a result, it is possible to prevent the seismic isolation support object from falling, and to minimize damage caused by the earthquake.

  According to the present invention, there is provided a seismic isolation support device that can be installed using a building floor or the like on which a seismic isolation support object such as a display stand or a bookshelf is installed, and that can easily increase the period. Can be provided.

FIG. 1 is a side view illustrating an example of a preferred embodiment according to the present invention. FIG. 2 is an operation explanatory diagram of the example shown in FIG. FIG. 3 is a side view of another example of a preferred embodiment according to the present invention. FIG. 4 is a side view of still another example of a preferred embodiment according to the present invention. FIG. 5 is a side view of still another example of a preferred embodiment according to the present invention. FIG. 6 is an operation explanatory diagram of the example shown in FIG.

  Next, the present invention will be described in more detail based on an example of a preferred embodiment shown in the drawings. The present invention is not limited to these examples.

  In FIG. 1, the seismic isolation support device 1 of this example is a load in the vertical direction V of a fixture 3 such as a store display stand that is a base isolation support object to be supported on the floor 2 of the store which is the ground or base. In order to receive, it has a cross-section arc convex outer surface 7 having a center O1 which is a center of curvature, and is fixed to the lower portion of the outer box 4 of the fixture 3 through a fixture 6 by a screw 5 or the like. The support 8 has a shape complementary to the convex outer surface 7 of the cross-section arc of the support 8 and has a center of curvature at the same position as the center O1, and is slidable in the R direction around the center O1 on the convex outer surface 7 of the cross-section arc. While having a cross-section arc concave outer surface 9 in contact with the flat surface 10 in the floor 2, a cross-section arc convex outer surface 11 having a center O2 that is the center of curvature is in contact with the center O2 so as to be rotatable in the R direction. It is designed to be able to roll freely around And it comprises a rotating body 12 receives a load in the vertical direction V of furniture 3 with the support 8 together.

  The support body 8 includes a cylindrical main body portion 22 having a screw portion 21 at an upper portion, and a partially spherical convex surface 23 that is integrally formed at a lower portion of the main body portion 22 and is a part of a spherical surface. It has a cross section arc convex outer surface 7, and includes a main body 22 and a sliding portion 24 disposed between the rotating bodies 12, and the main body 22 is vertical by a nut 25 screwed into the screw portion 21. The screw portion 21 is fixed to the fixture 6 so that the position thereof can be adjusted with respect to the direction V, and is fixed to the lower portion of the outer casing 4 of the fixture 3 via the fixture 6. Includes a disk part 26 formed integrally with the lower part of the main body part 22, and a partial sphere part 27 formed integrally with the disk part 26 and having a partial sphere convex surface 23. Yes.

  The rotating body 12 includes a cross-section arc concave outer surface 9 formed of a partial spherical concave surface 31 as a part of a spherical surface, and a cross-section arc convex outer surface 11 formed of a partial spherical convex surface 32 as a part of a spherical surface. And an annular end surface 33 connected to the cross-sectional arc convex outer surface 11 at the inner peripheral edge and connected to the cross-sectional arc convex outer surface 11 at the outer peripheral edge. 12 is slidable and rotatable in the R direction around the center O1 which is also the center of curvature of the circular arc concave outer surface 12 of the cross section, and the circular arc convex outer surface 11 is larger than the radius of curvature r1 of the circular arc concave outer surface 9 of the rotating body 12. The center O2, which has a large radius of curvature r2 and is the center of curvature of the cross-section arc convex outer surface 11 of the rotator 12, is the cross section of the rotator 12 when the seismic isolation support device 1 is stationary (the state shown in FIG. 1). For the center O1 that is the center of curvature of the concave outer surface 9 of the circular arc In the straight direction V, it is located eccentrically with an eccentricity δ (= r2−r1) above the fixture 3 side, and the cross-section arc convex outer surface 7 of the support 8 and the cross-section arc concave outer surface of the rotating body 12. The center O1 that is the center of curvature of 9 and the center O2 that is the center of curvature of the convex outer surface 11 of the cross-sectional arc of the rotating body 12 are located on the same vertical line 35 in the stationary state of the seismic isolation support device 1, Thus, the cross-section arc convex outer surface 7 of the support 8 has the same radius of curvature r1 as that of the cross-section arc concave outer surface 9 of the rotating body 12. The center O1 that is the center of curvature with the concave outer surface 9 of the circular arc of the rotating body 12 is located at the same position.

  Each of the above-mentioned seismic isolation support devices 1 arranged in the lower part of the outer box 4 of the fixture 3 has a stationary state shown in FIG. 1 when the horizontal vibration H caused by the earthquake is not applied to the floor 2. In the state, the load of the fixture 3 is shared on the floor 2 to support the fixture 3, and when the horizontal vibration H due to the earthquake is applied to the floor 2, the rotating body 12 of each seismic isolation support device 1. 2 is centered with respect to the partial circular sphere portion 27 at the cross-section arc convex outer surface 11 on the flat surface 10 of the floor 2 with the sliding of the cross-section arc concave outer surface 9 with respect to the cross-section arc convex outer surface 7 as shown in FIG. Rotating in the R direction around O1, the seismic isolation support device 1 prevents the horizontal H vibrations applied to the floor 2 from being transmitted to the fixture 3, thus causing the fixture 3 to move. While the base is isolated, the curvature of the convex outer surface 11 of the circular arc caused by the eccentricity δ between the center O1 and the center O2 Due to the difference between the radius r2 and the radius of curvature r1 of the cross-section arc concave outer surface 9, the rotating body 12 that lifts the fixture 3 in the vertical direction V along with the rotation in the R direction is stationary at each rotational position of the rotating body 12. Returning moment M = W · δ · sin θ (W is a load applied to the rotating body 12, δ is an eccentricity δ = (r2-r1), and θ is the rotating body 12 relative to the vertical line 35. The rotating body 12 that performs a pendulum motion with a so-called period T by the return moment M causes the cross-sectional arc convex outer surface 7 to disappear after the vibration of the floor 2 in the horizontal direction H due to the earthquake disappears. Returned to the rotational position in the stationary state together with the convergence of the pendulum motion due to the dissipation of the vibration energy due to the sliding friction of the circular arc concave outer surface 9 and the rolling friction on the circular arc convex outer surface 11 of the rotating body 12 with respect to the flat surface 10 of the floor 2, The vessel 3 has returned to the original position before the earthquake vibration.

  The period T of the pendulum motion of the rotator 12 is expressed by the equation (1). When θ is small, θ / sin θ≈1. As a result, the period T is expressed by the equation (2) and is a cross-sectional arc. The smaller the amount of eccentricity δ (= r2-r1), which is the difference between the radius of curvature r2 of the convex outer surface 11 and the radius of curvature r1 of the concave outer surface 9 of the circular arc, the longer it is, and conversely, the amount of eccentricity δ (= The larger r2-r1), the shorter.

ここで、ｇは、重力加速度である。

Here, g is a gravitational acceleration.

  In the seismic isolation support device 1 described above, the rotating body 12 has the cross-section arc convex outer surface 11 configured to roll and rotate in contact with the flat surface 10 of the floor 2, and the cross-section arc convex outer surface 11 in the stationary state. The center O2, which is the center of curvature, is eccentric with respect to the center O1, which is the center of curvature of the concave arcuate outer surface 9 in the vertical direction V by the amount of eccentricity δ. As a result, the flat surface 10 of the floor 2 is used as it is. And the period T of the pendulum motion of the rotating body 12 can be determined by the eccentricity δ, which is the difference between the curvature radius r1 of the cross-section arc concave outer surface 9 and the curvature radius r2 of the cross-section arc convex outer surface 11. In addition, it is possible to easily increase the period, and the cross-section arc convex outer surface 7 is formed of the partial circular convex surface 23 and the cross-section arc concave outer surface 9 is formed of the partial circular concave surface 31. Consists of a convex part 32 In other words, since each of them is made of a spherical surface, the fixture 3 can be isolated from the vibration of the omnidirectional earthquake with respect to the horizontal direction H. In addition, the support body is supported by the screw portion 21 and the nut 25. Since the attachment position to the fixture 6 can be adjusted, the fixture 3 can be seismically isolated at an arbitrary position in the vertical direction V.

  Incidentally, in the seismic isolation support device 1 shown in FIG. 1, the rotating body 12 is formed as an integral body from a rigid body, but instead, for example, as shown in FIG. A rigid body 42 having a partial spherical concave surface 31, an annular end surface 33 and a partial circular convex surface 41, which are formed of the outer surface 9, and a cross-sectional arc convex fixed to the partial spherical convex surface 41 of the rigid body 42 by vulcanization adhesion. The elastic body 43 made of natural rubber having a partially circular convex surface 32 made of the outer surface 11 may be provided. Thus, the rotating body 12 includes the elastic body 43 as a coating layer for the rigid body 42. In this case, the fixture 3 can be isolated and supported against earthquakes in all directions with respect to the horizontal direction H, and also due to the elastic deformation of the elastic body 43, against the earthquake caused by the vertical V earthquake applied to the floor 2. Supports the seismic isolation of the fixture 3, and the fixture 3 itself and The article in the vessel 3 can also be protected, and in addition, by flattening the cross-section arc convex outer surface 11 due to the dent of the part due to the partial elastic deformation of the part of the elastic body 43 that receives the load in the vertical direction V in the stationary state. A trigger action can be obtained.

  In the seismic isolation support device 1 shown in FIGS. 1 and 3, the cross-section arc convex outer surface 7 of the support 8 has a center O1 at the same position as the center O1 of the cross-section arc concave outer surface 9 of the rotating body 12, and Although the radius of curvature r1 is the same as the radius of curvature r1 of the circular arc concave outer surface 9 of the rotating body 12, instead of this, for example, as shown in FIG. From the curvature radius r1 of the cross-section arc concave outer surface 9 of the rotary body 12 having a center O3 on the same vertical line 35 that is different from the position of the center O1 of the cross-section arc concave outer surface 9 of the rotary body 12 in the vertical direction V. May have a small radius of curvature r3. In this case, the slidable surface contact between the cross-section arc convex outer surface 7 and the cross-section arc concave outer surface 9 of the seismic isolation support device 1 shown in FIGS. Compared to the above, the cross-section arc convex outer surface 7 and the cross-section arc concave outer surface 9 are slidable. A substantially point contact.

  In the seismic isolation support device 1 described above, there is a possibility that the rotary body 12 may be detached from the support body 8 in the earthquake vibration accompanied by the large rotation angle θ of the rotary body 12. However, as shown in FIG. The apparatus 1 supports the rotation of the rotating body 12 in the R direction around the center O1 that is the center of curvature of the concave outer surface 9 of the circular arc with respect to the supporting body 8 by prohibiting the rotating body 12 from rotating beyond a certain level. A detachment preventing mechanism 61 that prevents the rotator 12 from being detached from the body 8 may be further provided. The detachment preventing mechanism 61 is attached to the support 8 and surrounds the rotator 12. 62.

  The surrounding body 62 is sandwiched between the fixture 6 and the nut 25 and fixed to the screw portion 21 of the support body 8, and the rotating body 12 is integrated with the outer peripheral edge of the ceiling portion 63 at the upper end. And a cylindrical portion 64 that surrounds the lower portion of the cylindrical portion 64, and protrudes outward in the horizontal direction H from the lower end of the cylindrical portion 64 and contacts the flat surface 10 of the floor 2 with the annular lower surface 65. The annular outer flange 66 and the annular outer flange 66 are integrally formed with the cylindrical portion 64 above the annular outer flange 66 and protrude inward in the horizontal direction H from the cylindrical inner surface 67 of the cylindrical portion 64, and the rotating body 12 rotates. And an annular inner flange 70 having a cylindrical inner peripheral surface 69 defining an opening 68 to be obtained.

  In the seismic isolation support device 1 having such a detachment prevention mechanism 61, as shown in FIG. 6, a large rotation angle of the rotator 12 around the center O <b> 1 that is the center of curvature of the cross-section arc convex outer surface 7 of the support 8. In the rotation of the rotating body 12 in the R direction more than a certain level due to the vibration of the horizontal H earthquake with θ, the rotating body 12 collides with and comes into contact with the lower surface 71 of the ceiling portion 63 that is the inner surface of the surrounding body 62. The rotation in the R direction as described above is prohibited. Thus, in the rotation of the rotating body 12 above a certain point around the center O1 that is the center of curvature of the convex outer surface 7 of the cross-section arc of the support 8, The surrounding body 62 having the lower surface 71 of the ceiling portion 63 that is the inner surface with which the rotating body 12 comes into contact is configured to prevent the rotating body 12 from being detached from the sliding portion 24 of the support 8.

  According to the seismic isolation support device 1 provided with the separation prevention mechanism 61, even if the rotating body 12 is about to rotate greatly due to an unintended large horizontal H vibration, the rotating body 12 is prohibited from rotating beyond a certain level. As a result of preventing the detachment of the rotating body 12 from 8, the fall of the fixture 3 can be prevented, and damage caused by the earthquake can be minimized.

  In the detachment prevention mechanism 61 having the surrounding body 62, the seismic isolation support device 1 is provided with the annular outer flange portion 66 that is in contact with the flat surface 10 with the annular lower surface 65 when the seismic isolation support device 1 is stationary. The inside 72 of the surrounding body 62 in the stationary state can be sealed from the outside, dust can be prevented from entering the inside 72, and malfunction of the seismic isolation support device 1 due to dust can be avoided.

  In the above-described seismic isolation support device 1, the support 8 is fixed to the outer box 4 of the fixture 3, and the cross-section arc convex outer surface 11 of the rotating body 12 is brought into rolling contact with the flat surface 10 of the floor 2. Instead, the support 8 is fixed to the floor 2 with the screw portion 21, and the cross-section arc convex outer surface 11 of the rotating body 12 is rotatably contacted with the flat surface 81 (see FIG. 1) that is the lower surface of the outer box 4 of the fixture 3. In other words, the combination of the support body 8 and the rotating body 12 may be upside down. In such a seismic isolation support device that is upside down, the cross-section of the arcuate outer surface 11 of the rotating body 12 The center O2, which is the center of curvature, is decentered downward on the floor 2 side in the vertical direction V with respect to the center O1, which is the center of curvature of the concave outer surface 9 of the cross-section arc of the rotating body 12, when the seismic isolation support device is stationary. It may be positioned eccentrically with an amount δ.

DESCRIPTION OF SYMBOLS 1 Seismic isolation support apparatus 2 Floor 3 Fixture V Vertical direction 4 Outer box 5 Screw 6 Attachment 7 Cross section circular convex outer surface 8 Support body 9 Cross section circular concave outer surface 10 Flat surface 11 Cross section circular convex outer surface 12 Rotating body

Claims (15)

  In order to receive the load of the seismic isolation support object to be supported on the ground or the base, the first cross-section arc is fixed to one of the ground or the base and the base isolation support target On the other side of the ground or the base and the seismic isolation support object, while having a support having a convex outer surface and a cross-section arc concave outer surface slidably contacting the convex outer surface of the first cross-section arc of the support The flat surface is configured to freely contact with the convex outer surface of the second cross-section arc, and includes a rotating body that receives the load of the seismic isolation support object together with the support body. On the other hand, it is rotatable about the center of curvature of the concave outer surface of the circular arc of the rotating body, and the convex outer surface of the second circular arc of the rotating body is larger than the radius of curvature of the concave outer surface of the circular arc of the rotating body. And in a stationary state, the second of the rotating body The center of curvature of the surface arc convex outer surface is eccentrically positioned on one side of the ground or the base and the base-isolated support object in the vertical direction with respect to the center of curvature of the concave outer surface of the circular arc of the rotating body. Seismic isolation support device.   2. The seismic isolation support device according to claim 1, wherein the first cross-section arc convex outer surface of the support body and the cross-section arc concave outer surface of the rotating body are formed of a part of a cylindrical surface.   The seismic isolation support device according to claim 1, wherein the first cross-section arc convex outer surface of the support body and the cross-section arc concave outer surface of the rotating body are formed of a part of a spherical surface.   The support body is fixed to one of the ground or the base and the seismic isolation support object, and is formed integrally with the main body section and has the first cross-section arc convex The seismic isolation support device according to any one of claims 1 to 3, further comprising an outer surface and a sliding portion disposed between the main body portion and the rotating body.   The seismic isolation support device according to any one of claims 1 to 4, wherein the first cross-section arc convex outer surface of the support has the same radius of curvature as that of the cross-section arc concave outer surface of the rotating body.   6. The seismic isolation support device according to claim 5, wherein the centers of curvature of the first cross-section arc convex outer surface of the support and the cross-section arc concave outer surface of the rotating body are located at the same position.   5. The seismic isolation support device according to claim 1, wherein the first cross-section arc convex outer surface of the support body has a curvature radius smaller than the curvature radius of the cross-section arc concave outer surface of the rotating body.   The seismic isolation support device according to any one of claims 1 to 7, wherein, in a stationary state, the centers of curvature of the cross-section arc concave outer surface and the second cross-section arc convex outer surface of the rotating body are located on the same vertical line. .   9. The center of curvature of the first cross-section arc convex outer surface of the support and the cross-section arc concave outer surface and the second cross-section arc convex outer surface of the rotating body is located on the same vertical line in a stationary state. The seismic isolation support device according to any one of the above.   The rotating body includes a rigid body having a concave outer surface of a circular arc and an elastic body fixed to the rigid body and having a convex outer surface of a second cross section. The seismic isolation support device described in 1.   The rotary body includes an elastic body having a concave outer surface of a circular arc and a rigid body fixed to the elastic body and having a convex outer surface of a second cross sectional arc. The seismic isolation support device according to item.   The support body is designed to be fixed to the seismic isolation support object, and the rotating body is configured to freely come into contact with the ground surface or the flat surface of the base at the second section arc convex outer surface, The center of curvature of the convex outer surface of the second cross-sectional arc of the rotating body is located eccentrically upward in the vertical direction with respect to the center of curvature of the concave outer surface of the circular arc of the rotating body. The seismic isolation support device according to item.   The support is adapted to be fixed to the ground or the base, and the rotating body is adapted to freely contact the flat surface of the seismic isolation support object at the second section arc convex outer surface, The center of curvature of the convex outer surface of the second cross-section arc of the rotating body is located eccentrically downward in the vertical direction with respect to the center of curvature of the concave outer surface of the section arc of the rotating body. The seismic isolation support device according to item.   A detachment prevention mechanism that prevents the rotation of the rotating body from the support by prohibiting the rotation of the rotating body beyond a certain level when the rotating body collides with the rotating body around the center of curvature of the concave outer surface of the circular arc with respect to the supporting body. The seismic isolation support device according to any one of claims 1 to 13, which is provided.   The detachment prevention mechanism includes a surrounding body that is attached to the support body and surrounds the rotating body, and the surrounding body is constant around the center of curvature of the concave outer surface of the circular arc of the rotating body relative to the supporting body. The seismic isolation support device according to claim 14, which has an inner surface with which the rotating body contacts in the above rotation.

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