JP2015014319A - 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, for example, 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 perpendicular direction V; and a rotary body 13 which is slidable in an R direction around a center O1 so as to have an arcuately-sectioned outer surface 9 brought into rotatable contact with the arcuately-sectioned convex outer surface 7 of the support body 8 and also to have an arcuately-sectioned convex outer surface 11 brought into contact with a flat surface 10 of the floor 2 rotatably around the center O1, and bears the load of the furniture 3 in the perpendicular direction V via the support body 8 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, the floor of a building such as a display stand or a shelf where bookcases are installed is directly used for the seismic isolation device. However, 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, An object of the present invention is 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 cross-section arc outer surface, a cross-section arc outer face having a shape complementary to the cross-section arc outer face of the support body, and a cross-section arc outer face having a shape complementary to the cross-section arc outer face of the support body. While being slidably in contact with the outer surface of the arc of the cross section of the support, it is configured to come into contact with the outer surface of the arc of the cross section so that it can freely roll to the flat surface on the other of the ground or base and the base isolation support object. A rotating body that receives the load of the seismic isolation support object together with the body, and the outer surface of the rotating body has a larger radius of curvature than the outer surface of the rotating body. In the state, the cross-sectional arc convex of the rotating body Curvature of the surface center is located eccentrically to one side of one of the ground or base and seismic isolation support object in the vertical direction relative to the center of curvature of arcuate cross-sectional outer surface of the rotating body.

  According to the seismic isolation support device of the present invention, the rotating body comes into contact with the convex outer surface of the cross-section arc so that it can freely roll to the flat surface of the other of the ground or the base and the base isolation support object. In a stationary state, the center of curvature of the convex outer surface of the circular arc of the rotating body is eccentric to one side of the ground or the base and the base isolation support object in the vertical direction with respect to the center of curvature of the outer circular arc surface of the rotating body. As a result, it can be installed using the display floor and other fixtures, the building floor where the bookshelf etc. are installed as it is, and the vibration cycle is the center of curvature of the convex outer surface of the circular arc of the rotating body in a stationary state. And the center of curvature of the outer surface of the circular arc of the rotating body can be determined by the amount of eccentricity in the vertical direction.

  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 cross-sectional arc outer surface of the support body may be a cross-section arc convex surface, and the cross-section arc outer surface of the rotating body may be a cross-section arc concave surface. It is a concave surface, and the cross-sectional arc outer surface of the rotating body may be a cross-section arc convex surface.

  The outer cross-section arc outer surface of the support body and the outer cross-section arc outer surface of these rotating surfaces are trigger functions (functions in which sliding does not occur at vibration acceleration below a certain level, and sliding occurs at vibration acceleration above a certain level) and If the vibration damping function (the function of absorbing vibration energy that dissipates vibration as heat during sliding and absorbs the vibration energy that causes sliding) is not required, it should be composed of a surface with a very small coefficient of friction. Thus, when the trigger function and the vibration damping function are required, it is preferable that the trigger function and the vibration damping function have a friction coefficient with an appropriate size. Having a trigger function can avoid unnecessary and sensitive relative vibrations of the base-isolated support object by applying a small vibration acceleration of the ground or base and applying a small vibration acceleration to the base-isolated support object. If it has a vibration damping function, the base-isolated support object that once vibrates relative to the ground or the base can be quickly returned to a stationary state.

  On the other hand, the convex outer surface of the circular arc of the rotating body that serves as the rolling surface is moderate in order not to slip easily against the ground or the 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 the present invention, the cross-section arc outer surface of the support body and the cross-section arc outer surface and the cross-section arc convex outer surface of the rotating body may be part of a cylindrical surface or part of a spherical surface. When it consists of parts, it can give directionality to the seismic isolation effect, and when it consists of a part of a spherical surface, it can exhibit the seismic isolation effect against vibrations in all directions of the horizontal plane. When giving directionality to the seismic isolation effect, it is not necessary to configure all of the cross-section arc outer surface of the support and the cross-section arc outer surface and the cross-section arc convex outer surface of the rotating body from a part of the cylindrical surface. What is necessary is just to comprise from a part.

  In the present invention, the rotating body only needs to be rotatable about the center of curvature of the outer surface of the cross-section arc of the support. In this case, the seismic isolation support device is stationary (the seismic isolation support object to be supported is the ground or the base. The center of curvature of the cross-section arc outer surface of the support and the curvature of the cross-section convex outer surface of the rotating body in a state where the seismic isolation support device does not exhibit seismic isolation function) The center is preferably 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 includes a rigid body having a cross-section arc outer surface and an elastic body fixed to the rigid body and having a cross-section arc convex outer surface. Conversely, an elastic body having a cross-section arc outer surface and a rigid body fixed to the elastic body and having a cross-section arc convex outer surface may be provided. If the elastic body is interposed between the support and the flat surface, the elastic body can absorb the vertical vibration of the ground or the base, and the elastic body in the stationary state of the seismic isolation support device In addition, if the rotating body has an elastic body having a cross-sectional arc convex outer surface, an unintended flat surface on the cross-section arc convex outer surface that comes into contact with the flat surface can be obtained. Rotating body can be reliably rotated Rolling can be performed, also the such elastic body is applied to a support, it may be able to absorb vibrations in the vertical direction of the ground or base by the elastic deformation of the elastic body of the support.

  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, and in this case, the rotating body is able to freely roll on the ground surface or the flat surface of the base at the convex outer surface of the cross-section arc. As long as the center of curvature of the convex outer surface of the circular arc of the rotating body is located eccentrically upward in the vertical direction with respect to the center of curvature of the outer surface of the circular arc of the rotating body, On the contrary, the support may be fixed to the ground or the base, and in this case, the rotating body can freely roll on the flat surface of the seismic isolation support object at its convex arc outer surface. The center of curvature of the convex outer surface of the circular arc of the rotating body only needs to be located eccentrically downward in the vertical direction with respect to the center of curvature of the outer surface of the circular arc of the rotating body.

  The seismic isolation support device according to the present invention prevents the rotation of the rotating body from the support by prohibiting the rotation of the rotating body by a collision of the rotating body around the center of curvature of the outer surface of the circular arc of the support. May be further provided with a detachment prevention mechanism, and the detachment prevention mechanism may be provided with 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 when the rotating body rotates at a certain level or more about the center of curvature of the outer surface of the cross-section arc of 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 used as it is by installing a floor such as a display stand, a building floor on which a seismic isolation support target such as a book shelf is installed, and can easily increase the period. Can be offered.

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 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, a support body 8 which is fixed to a lower portion of the outer box 4 of the fixture 3 via a fixture 6 by a screw 5 or the like and has a cross-section arc convex outer surface 7; The cross-section arc convex outer surface 7 has one cross-section arc concave outer surface 9 complementary to the cross-section arc convex outer surface 7 and is slidable in the R direction around the center O1 on the cross-section arc convex outer surface 7 of the support 8. While rotating freely in contact with the flat surface 10 of the floor 2 around the center O1 in the R direction with the cross-section arc convex outer surface 11, that is, rolling around the center O1 with the cross-section arc convex outer surface 11 Of the fixture 3 through the support 8 while being in contact with each other And it comprises a rotating body 13 for receiving a load straight direction V with the support 8.

  The support body 8 has a cylindrical main body 23 having a screw portion 21 and a constricted portion 22, and a partial spherical portion 24 provided integrally with the constricted portion 22 of the main body 23. The screw portion 21 is fixed to the fixture 6 so that the position thereof can be adjusted with respect to the vertical direction V by a screwed nut 25, and the cross-section arc convex outer surface 7 is a portion of a partial circular sphere portion 24 as a part of a spherical surface. It consists of a circular convex surface 26.

  The rotating body 13 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. On the one hand, a frustoconical outer surface including a frustoconical outer surface or a frustoquad pyramid outer surface connected to the arcuate convex outer surface 11 on the cross section, and on the other hand, an outer surface of the truncated polygonal pyramid, etc. And the center of curvature of the cross-section arc convex outer surface 7 of the support 8 and the center of curvature of the cross-section arc concave outer surface 9 of the rotating body 13 with respect to the cross-section arc convex outer surface 7 of the support 8. A center O2 that is freely rotatable in the R direction around a center O1 and that is the center of curvature of the cross-section arc convex outer surface 11 of the rotating body 13 is in a stationary state (state shown in FIG. 1) of the seismic isolation support device 1. The cross section of the rotating body 13 is opposite to the center O1 which is the center of curvature of the concave outer surface 9 of the arc. In the vertical direction V, it is located eccentrically with an eccentricity δ above the fixture 3 side, the center O1 that is the center of curvature of the convex outer surface 7 of the cross-section arc of the support 8 and the cross-section arc of the rotating body 13. The center O2 which is the center of curvature of the convex outer surface 11 is located on the same vertical line 35 in the stationary state of the seismic isolation support device 1, and the cross-section arc convex outer surface 11 of the rotating body 13 is the seismic isolation support device. 1 has a radius of curvature r2 that is larger than the distance r1 between the center O1 and the position P where the cross-section arc convex outer surface 11 contacts the flat surface 10 of the floor 2 in the stationary state. The quantity δ is r2-r1.

  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 13 of each seismic isolation support device 1. As shown in FIG. 2, on the flat surface 10 of the floor 2, the seismic isolation support device 1 rotates in the R direction around the center O 1 with respect to the partial spherical portion 24. 2 prevents the horizontal H vibrations applied to 2 from being transmitted to the fixture 3 and thus supports the fixture 3 in isolation, while the cross-section of the convex outer surface of the circular arc due to the eccentricity δ between the center O1 and the center O2 11 with the radius of curvature r2 and the distance r1, lift the fixture 3 in the vertical direction V along with the rotation in the R direction The rotating body 13 thus configured has a return moment M = W · δ · sin θ at each rotational position of the rotating body 13 (where W is a load applied to the rotating body 13 and δ is an eccentricity). The quantity δ = (r2−r1), θ is the rotation angle of the rotator 13), and this return moment M causes the rotator 13 that performs a so-called pendulum motion with a period T to move horizontally due to an earthquake. After the disappearance of the vibration of the floor 2 of H, the pendulum motion converges due to the dissipation of the vibration energy due to the sliding friction of the concave outer surface 9 of the circular arc against the convex outer surface 7 of the cross section and the rolling friction of the rotating body 13 to the flat surface 10 of the floor 2. Returning to the rotational position in the state, the fixture 3 is returned to the original position before the earthquake vibration.

  The period T of the pendulum motion of the rotating body 13 is expressed by the formula (1). When θ is small, θ / sin θ≈1. As a result, the period T is expressed by the formula (2) and is a cross-sectional arc. The smaller the eccentricity amount δ (= r2-r1), which is the difference between the radius of curvature r2 of the convex outer surface 11 and the distance r1, the longer it is, and conversely, the larger the eccentricity amount δ (= r2-r1) is. The larger the size, the shorter.

ここで、ｇは、重力加速度である。

Here, g is a gravitational acceleration.

  In the above seismic isolation support device 1, the rotating body 13 is configured to come into contact with the flat surface 10 of the floor 2 so as to be able to roll and rotate freely at its cross-section arc convex outer surface 11. 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. In addition, the period T of the pendulum motion of the rotating body 13 can be determined by the eccentric amount δ which is the difference between the distance r1 and the radius of curvature r2 of the convex outer surface 11 of the cross-section arc. In addition, the cross-section arc convex outer surface 7 is composed of a partial spherical convex surface 26, the cross-section arc convex outer surface 9 is composed of a partial spherical concave surface 31, and the cross-section arc convex outer surface 11 is formed from the partial spherical convex surface 32. That is, each is a spherical surface Therefore, the fixture 3 can be isolated from the vibrations in all directions with respect to the horizontal direction H. In addition, the mounting position of the support 8 on the fixture 6 by the screw portion 21 and the nut 25 is provided. Therefore, 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 13 is formed as an integral body from a rigid body, but instead, for example, as shown in FIG. A rigid body 42 having an outer surface 9, a frustoconical outer surface 33 and a partial spherical convex surface 41, and a natural rubber which is fixed to the partial spherical convex surface 41 of the rigid body 42 by vulcanization and has a cross-sectional arc convex outer surface 11. If the rotating body 13 is provided with the elastic body 43 as a covering layer for the rigid body 42 as described above, it is possible to prevent earthquakes in all directions with respect to the horizontal direction H. In addition to being able to support the fixture 3 in a seismic isolation manner, the elastic body 43 can also support the isolation of the fixture 3 against the vibration caused by the earthquake in the vertical direction V applied to the floor 2 due to the elastic deformation of the elastic body 43. Can also protect the goods, and in addition So that it is possible to obtain a trigger action in flattening of the cross-sectional arc convex outer surface 11 due to the recess of the partial by partial elastic deformation of the portion of the elastic body 43 for receiving a load of V.

  In the seismic isolation support device 1 shown in FIG. 1 and FIG. 3, there is a possibility that the rotating body 13 may be detached from the supporting body 8 in the earthquake vibration accompanied by the large rotation angle θ of the rotating body 13, as shown in FIG. 4. In addition, the seismic isolation support device 1 rotates more than a certain amount due to the collision of the rotating body 13 in the R direction rotation of the rotating body 13 around the center O1 which is the center of curvature of the convex outer surface 7 of the circular arc of the support 8. And a detachment prevention mechanism 51 that prevents the rotator 13 from being detached from the support 8. The detachment prevention mechanism 51 is attached to the support 8 and surrounds the rotator 13. The surrounding body 52 is provided.

  The surrounding body 52 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 13 is integrally formed at the upper end with the outer peripheral edge of the ceiling portion 55. And a cylindrical portion 56 that surrounds the lower portion of the cylindrical portion 56, projecting outward in the horizontal direction H from the lower end of the cylindrical portion 56, and contacting the flat surface 10 of the floor 2 at the annular lower surface 57. An annular outer flange 58 and an upper portion of the annular outer flange 58 integrally with the cylindrical portion 56 project inward in the horizontal direction H from the cylindrical inner surface 59 of the cylindrical portion 56 and the rotating body 13 can rotate. And an annular inner flange 62 having a cylindrical inner peripheral surface 61 defining an opening 60.

  In the seismic isolation support device 1 having such a detachment prevention mechanism 51, as shown in FIG. 5, a large rotation angle of the rotator 13 about 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 13 in the R direction more than a certain level due to the vibration of the horizontal H earthquake with θ, the rotating body 13 collides with and comes into contact with the lower surface 63 of the ceiling portion 55 that is the inner surface of the enclosure 52. The above rotation is prohibited, and therefore, in the rotation of the rotating body 13 around the center O1, which is the center of curvature of the cross-section arc convex outer surface 7 of the support 8, the rotating body The surrounding body 52 having the lower surface 63 of the ceiling portion 55, which is the inner surface with which the 13 contacts, prevents the rotator 13 from being detached from the partial spherical portion 24 of the support 8.

  According to the seismic isolation support device 1 provided with the separation preventing mechanism 51, even if the rotating body 13 is about to rotate greatly due to an unintended large horizontal H vibration, the rotating body 13 is prohibited from rotating beyond a certain level. As a result of preventing the detachment of the rotating body 13 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 51 having the surrounding body 52, the seismic isolation support device 1 includes the annular outer flange portion 58 that is in contact with the flat surface 10 at the annular lower surface 57 in the stationary state of the seismic isolation support device 1. The inside 65 of the enclosure 52 in a stationary state can be sealed with respect to the outside, dust can be prevented from entering the inside 65, 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 rotating body 13 is brought into rolling contact with the flat surface 10 of the floor 2 with its cross-section arc convex outer surface 11. Instead of this, the support 8 may be fixed to the floor 2 with the screw portion 21, and the cross-section arc convex outer surface 11 of the rotating body 13 may be brought into contact with the flat surface 71 which is the lower surface of the outer box 4 of the fixture 3 to be rotatable. In other words, the combination of the support body 8 and the rotating body 13 may be reversed upside down, and in such a seismic isolation support device that is upside down, the center of curvature of the cross-section arc convex outer surface 11 of the rotating body 13 is obtained. The center O2 is deviated from the center O1, which is the center of curvature of the circular arc concave outer surface 9 of the rotator 13, with a decentering amount δ below the floor 2 in the vertical direction V when the seismic isolation support device is stationary. It is good to be positioned in the center.

DESCRIPTION OF SYMBOLS 1 Seismic isolation support device 2 Floor 3 Fixture 4 Outer box 5 Screw 6 Attachment 7, 11 Cross section circular convex outer surface 8 Support body 9 Cross section circular concave outer surface 10 Flat surface 13 Rotating body O1, O2 Center r1 Distance r2 Curvature radius

Claims (13)

  In order to receive the load of the seismic isolation support object to be supported on the ground or base, it is fixed to one of the ground or base and the seismic isolation support object, and has a cross-section arc outer surface. And a cross-sectional arc outer surface of a shape complementary to the outer surface of the cross-section arc of the support and slides on the outer surface of the cross-section arc of the support with the outer shape of the cross-section arc complementary to the outer surface of the cross-section arc of the support. While freely contacting, the load of the seismic isolation support object together with the support is designed to be able to roll on the flat surface in the other of the ground or base and the seismic isolation support object so that it can freely contact with the convex outer surface of the cross-section arc. The outer surface of the circular arc of the rotating body has a radius of curvature larger than the radius of curvature of the outer surface of the circular arc of the rotating body. The center of curvature of the outer surface is a rotating body While seismic isolation support device is positioned eccentrically to the side of one of the ground or base in the vertical direction relative to the center of curvature of circular arc cross sectional outer surface and seismic isolation support object.   The seismic isolation support device according to claim 1, wherein the cross-sectional arc outer surface of the support body is a cross-section arc convex surface, and the cross-section arc outer surface of the rotating body is a cross-section arc concave surface.   The seismic isolation support device according to claim 1, wherein the cross-sectional arc outer surface of the support body is a cross-sectional arc concave surface, and the rotary body cross-section arc outer surface is a cross-section arc convex surface.   The seismic isolation support device according to any one of claims 1 to 3, wherein the cross-sectional arc outer surface of the support body and the cross-section arc outer surface and the cross-section arc convex outer surface of the rotating body are part of a cylindrical surface.   The seismic isolation support device according to any one of claims 1 to 3, wherein the cross-section arc outer surface of the support body and the cross-section arc outer surface and the cross-section arc convex outer surface of the rotating body are part of a spherical surface.   The seismic isolation support device according to any one of claims 1 to 5, wherein the rotating body is rotatable with respect to the support body about a center of curvature of an outer surface of the cross-section arc of the support body.   The seismic isolation support device according to claim 6, wherein the center of curvature of the outer surface of the arc of the support and the center of curvature of the outer surface of the arc of the rotor of the rotating body are located on the same vertical line in the stationary state.   The rotator includes a rigid body having a cross-sectional arc outer surface and an elastic body fixed to the rigid body and having a cross-sectional arc convex outer surface. Seismic support device.   The rotating body includes an elastic body having a cross-section arc outer surface, and a rigid body fixed to the elastic body and having a cross-section arc convex outer surface. Seismic isolation support device.   The support body is fixed to the seismic isolation support object, and the rotating body is configured to freely contact the ground surface or the flat surface of the base at the outer surface of the convex arc of the cross section. The center of curvature of the outer surface of the convex arc of the cross section is located eccentrically upward in the vertical direction with respect to the center of curvature of the outer surface of the circular arc of the rotating body. Support device.   The support body is fixed to the ground or the base, and the rotating body is configured to freely contact the flat surface of the seismic isolation support object at the outer surface of the circular arc of the cross section. The center of curvature of the outer surface of the convex arc of the cross section is located eccentrically downward in the vertical direction with respect to the center of curvature of the outer surface of the arc of the cross section of the rotating body. Support device.   Further provided with a separation preventing mechanism for preventing the separation of the rotating body from the support body by prohibiting the rotation of the rotating body more than a certain amount due to the collision of the rotating body in the rotation of the rotating body around the center of curvature of the outer surface of the arc of the cross section of the support body The seismic isolation support device according to any one of claims 1 to 11.   The separation prevention mechanism includes an enclosure that is attached to the support and surrounds the rotating body, and the enclosure is more than a certain amount of the rotating body centered on the center of curvature of the outer surface of the cross-section arc of the support. The seismic isolation support device according to claim 12, which has an inner surface with which the rotating body comes into contact.

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