JP7471153B2 - Seismic isolation device - Google Patents

Description

The present invention relates to a seismic isolator for fixtures, furniture, electrical equipment, etc., and in particular to a seismic isolator suitable for storage shelves with legs at the four corners, such as steel racks.

Conventionally, seismic isolation devices are known that are attached to the underside of seismic isolation objects such as fixtures, furniture, and electrical equipment, and are positioned between the seismic isolation object and the installation surface on which the seismic isolation object is installed, protecting the seismic isolation object from shaking of the installation surface caused by earthquakes, etc.

For example, Patent Document 1 discloses a seismic isolation device that is attached to each of the four corners of the underside of an object to be isolated. This seismic isolation device includes a base plate, an adhesive layer that is attached to the upper surface of the base plate and adheres to the underside of the object to be isolated, a gel-like seismic isolation pad that is attached to the underside of the base plate and has adhesive surfaces on both the front and back sides, and a number of spikes that are integrally formed on the underside of the base plate and bite into the adhesive surface of the seismic isolation pad.

This seismic isolation device allows the seismic isolation pad to absorb shaking of the installation surface caused by earthquakes, etc., and prevents this shaking from being transmitted to the seismic isolation object that is attached to the adhesive layer. In addition, spikes formed integrally with the underside of the base plate bite into the adhesive surface of the seismic isolation pad, preventing lateral slippage between the underside of the base plate and the adhesive surface of the seismic isolation pad.

JP 2006-312008 A

However, with the seismic isolation device described in Patent Document 1, if a large vibration occurs on the installation surface on which the seismic isolation object is installed that cannot be absorbed by the seismic isolation pad, this vibration may be transmitted to the seismic isolation object, causing the contents contained in the seismic isolation object to topple over, or the contents may fall from the seismic isolation object, or even the seismic isolation object itself topples over.

The present invention was made in consideration of the above circumstances, and its purpose is to provide a seismic isolation device that can more reliably prevent shaking of the installation surface caused by an earthquake or the like from being transmitted to the seismically isolated object.

In order to solve the above problems, the seismic isolation device of the present invention is attached to each of the four corners of a seismic isolation object such as fixtures, furniture, or electrical equipment, and is interposed between the seismic isolation object and the installation surface on which the seismic isolation object is installed. The sliding surface made of synthetic resin that slides against the installation surface protects the seismic isolation object from shaking of the installation surface due to earthquakes, etc. Also, the device has notches formed on the edge of the sliding surface that correspond to the corners of the seismic isolation object to which the seismic isolation device is attached.

For example, the first aspect of the present invention is
A seismic isolation device attached to each of the four corners of a seismic isolation object and interposed between the seismic isolation object and an installation surface on which the seismic isolation object is installed,
A plate-shaped body made of synthetic resin having an upper surface formed with a mounting surface on which the seismic isolation object is placed and a lower surface formed with a sliding surface that slides against the installation surface;
The edge of the sliding surface corresponding to the corner of the seismic isolation object to which the seismic isolation device is attached has a cutout portion formed so as not to reach the area sandwiched between the seismic isolation object placed on the placement surface and the installation surface .
In addition, a second aspect of the present invention is
A seismic isolation device attached to each of the four corners of a seismic isolation object and interposed between the seismic isolation object and an installation surface on which the seismic isolation object is installed,
A plate-shaped body made of synthetic resin having an upper surface formed with a mounting surface on which the seismic isolation object is placed and a lower surface formed with a sliding surface that slides against the installation surface;
and a cutout portion formed on an edge portion of the sliding surface corresponding to a corner portion of the seismic isolation object to which the seismic isolation device is attached.
The cutout portion is
The area of the cutout portion increases from the center side to the edge side of the sliding surface.
Moreover, a third aspect of the present invention is
A seismic isolation device is attached to each of the legs provided at the four corners of a seismic isolation object and is interposed between the seismic isolation object and an installation surface on which the seismic isolation object is installed,
A plate-shaped body made of synthetic resin having an upper surface formed with a mounting surface on which the seismic isolation object is placed and a lower surface formed with a sliding surface that slides against the installation surface;
A notch portion is formed on an edge portion of the sliding surface corresponding to a corner portion of the seismic isolation object to which the seismic isolation device is attached,
a pair of side walls that sandwich the leg portion and a connecting portion that connects the pair of side walls, the pair of side walls being integrally formed on an upper surface of the plate-like main body;
The plate-like main body has a rectangular shape,
The cutout portion is
Among the four sides constituting the edge portion of the sliding surface, three sides including two sides corresponding to the corners of the seismic isolation object to which the seismic isolation device is attached are formed,
The pair of side walls include
the notch is formed integrally on the upper surface of the plate-shaped main body along two opposing sides on which the notch is formed, among the four sides constituting the edge of the sliding surface;
The connecting portion is
The notch portions are formed integrally on the upper surface of the plate-shaped main body along the four sides constituting the edge of the sliding surface other than the three sides on which the notches are formed.
Moreover, a fourth aspect of the present invention is
A seismic isolation device is attached to each of the legs provided at the four corners of a seismic isolation object and is interposed between the seismic isolation object and an installation surface on which the seismic isolation object is installed,
A plate-shaped body made of synthetic resin having an upper surface formed with a mounting surface on which the seismic isolation object is placed and a lower surface formed with a sliding surface that slides against the installation surface;
A notch portion formed on an edge portion of the sliding surface corresponding to a corner portion of the seismic isolation object to which the seismic isolation device is attached;
a pair of side walls that sandwich the leg portion and a connecting portion that connects the pair of side walls, the pair of side walls being integrally formed on an upper surface of the plate-like main body;
The pair of side walls include
It has an engaging portion that engages with an engaged portion provided on the leg of the seismic isolation object.
Moreover, the fifth aspect of the present invention is
A seismic isolation device is attached to each of the legs provided at the four corners of a seismic isolation object and is interposed between the seismic isolation object and an installation surface on which the seismic isolation object is installed,
A plate-shaped body made of synthetic resin having a mounting surface on an upper surface on which the seismic isolation object is placed and a sliding surface on a lower surface which slides against the installation surface;
A notch portion formed on an edge portion of the sliding surface corresponding to a corner portion of the seismic isolation object to which the seismic isolation device is attached;
a pair of side walls that sandwich the leg portion and a connecting portion that connects the pair of side walls, the side walls being integrally formed on an upper surface of the plate-like body;
The plate-shaped main body has a column portion integrally formed on its upper surface and, together with the pair of side wall portions, sandwiches the legs of the seismic isolation object, which has a U-shaped cross section perpendicular to the axis.

In the present invention, when a large vibration occurs on the installation surface on which the seismic isolation object is installed, the sliding surface of the synthetic resin plate-shaped body slides against the installation surface, thereby preventing the vibration from being transmitted to the seismic isolation object. In addition, a notch is formed on the edge of the sliding surface corresponding to the corner of the seismic isolation object to which the seismic isolation device is attached, so that the contact area at the edge of the sliding surface can be reduced and the friction coefficient can be reduced. For this reason, for example, in a case where the seismic isolation object tilts (lifts) due to earthquake motion and the load of the seismic isolation object is concentrated on the edge of the sliding surface, the sliding surface and the installation surface are in a state of lower friction, so that the moment about the end of the seismic isolation object in the vibration direction of the installation surface is suppressed from occurring in the seismic isolation object, and the seismic isolation object can be prevented from falling over. Therefore, according to the present invention, it is possible to more reliably prevent the vibration of the installation surface due to an earthquake or the like from being transmitted to the seismic isolation object.

Figures 1(A), 1(B) and 1(C) are a front view, a side view and a bottom view of a storage shelf 2 to which a seismic isolation device 1 according to one embodiment of the present invention is attached, and Figure 1(D) is an enlarged view of part A of leg 20 of storage shelf 2 shown in Figure 1(A). 2A and 2B are BB and CC cross-sectional views of the leg 20 of the storage shelf 2 shown in FIG. 1D. Figures 3(A), 3(B) and 3(C) are a front view, a side view and a rear view of a seismic isolator 1 according to one embodiment of the present invention, and Figure 3(D) is a cross-sectional view taken along line D-D of the seismic isolator 1 shown in Figure 3(A). Figures 4(A), 4(B), 4(C) and 4(D) are enlarged cross-sectional views E-E, F-F, G-G and H-H of the seismic isolation device 1 shown in Figure 3(A). 1 is a diagram for explaining a modified example 1a of the seismic isolator 1 according to one embodiment of the present invention, and corresponds to FIG. 3(C). 3(C) is a diagram for explaining a modified example 1b of the seismic isolator 1 according to one embodiment of the present invention. FIG. 3(C) is a diagram for explaining a modified example 1c of the seismic isolator 1 according to one embodiment of the present invention. FIG.

The following describes one embodiment of the present invention.

Figures 1(A), 1(B) and 1(C) are front, side and bottom views of a storage shelf 2 to which a seismic isolator 1 according to this embodiment is attached, and Figure 1(D) is an enlarged view of part A of leg 20 of storage shelf 2 shown in Figure 1(A). Also, Figures 2(A) and 2(B) are cross-sectional views taken along lines B-B and C-C of leg 20 of storage shelf 2 shown in Figure 1(D).

As shown in the figure, the seismic isolation device 1 according to this embodiment is attached to each of the legs 20 at the four corners of a storage shelf 2 such as a steel rack, and is interposed between the storage shelf 2 and an installation surface 3 such as a floor on which the storage shelf 2 is installed, protecting the storage shelf 2 from shaking of the installation surface 3 due to earthquakes, etc.

The seismic isolation device 1 uses a sliding material made of synthetic resin such as polyacetal resin, polyamide resin, polybutylene terephthalate resin, polyester resin, polyphenylene sulfide resin, phenolic resin, polyimide resin, polyamideimide resin, polyether ether ketone resin, polypropylene resin, polycarbonate resin, high density polyethylene resin, ultra-high molecular weight polyethylene resin, etc., with lubricants such as lubricating oil, silicone, wax, polytetrafluoroethylene, etc. added as necessary.

Figures 3(A), 3(B) and 3(C) are a front view, a side view and a rear view of the seismic isolator 1 according to this embodiment, and Figure 3(D) is a cross-sectional view taken along line D-D of the seismic isolator 1 shown in Figure 3(A). Figures 4(A), 4(B), 4(C) and 4(D) are enlarged cross-sectional views taken along lines E-E, F-F, G-G and H-H of the seismic isolator 1 shown in Figure 3(A).

As shown in the figure, the seismic isolation device 1 has a plate-shaped main body 10 on which the legs 20 of the storage shelf 2 are placed, a pair of side walls 11 that sandwich the legs 20, a connecting portion 12 that connects the pair of side walls 11, and a pair of columns 13.

The plate-like body 10 has a rectangular shape that matches the underside of the legs 20 of the storage shelf 2 (see FIG. 2), and has a support surface 101 formed on the upper surface 100 for supporting the legs 20 of the storage shelf 2, and a sliding surface 103 formed on the lower surface 102 for sliding against the installation surface 3.

The sliding surface 103 has a plurality of notches 105 formed in the edge portion 104 and a plurality of recesses 107 formed in the center portion 106. Note that it is sufficient that at least one recess 107 is formed in the sliding surface 103.

The notch 105 is formed on three sides 104a to 104c, including two sides 104a and 104b that correspond to the corner α of the storage shelf 2, among the four sides 104a to 104d that constitute the edge 104 of the sliding surface 103 (see FIG. 2). In this way, by forming the notch 105 on three sides 104a to 104c of the four sides 104a to 104d that constitute the edge 104 of the sliding surface 103, the notch 105 can be positioned at the corner α of the storage shelf 2 when the seismic isolator 1 is attached to all of the legs 20 that the storage shelf 2 has at the four corners. However, it is sufficient that the notch 105 is formed so as to be located at the edge 104 of the sliding surface 103 that corresponds to the corner α of the storage shelf 2 when the seismic isolator 1 is attached to the legs 20 of the storage shelf 2.

The pair of side walls 11 are integrally formed on the upper surface 100 of the plate-shaped body 10 along the two opposing sides 104a, 104c on which the notch 105 is formed, among the four sides 104a to 104d that constitute the edge 104 of the sliding surface 103 of the plate-shaped body 10, and sandwich the leg 20 of the storage shelf 2 placed on the mounting surface 101 of the plate-shaped body 10. This prevents the seismic isolator 1 attached to the leg 20 of the storage shelf 2 from rattling. The side walls 11 also have a snap-fit portion 110 that engages with the engaged portion (through hole) 200 formed on the leg 20 of the storage shelf 2 (see Figure 2). This prevents the seismic isolator 1 from falling off the leg 20 of the storage shelf 2.

The connecting portions 12 are formed integrally with the upper surface 100 of the plate-shaped body 10 along the four sides 104a-104d constituting the edge 104 of the sliding surface 103 of the plate-shaped body 10, except for the three sides 104a-104c on which the notch 105 is formed, and connect the pair of side walls 11 at their ends. This increases the force with which the pair of side walls 11 clamp the legs 20 of the storage shelf 2 placed on the placement surface 101 of the plate-shaped body 10. The connecting portions 12 also prevent the pair of side walls 11 from collapsing inward due to shrinkage during resin molding.

A convex portion 14 is provided on the inner wall 120 of the connecting portion 12. As shown in FIG. 2, the leg portion 20 of the storage shelf 2 has a U-shaped cross section perpendicular to the axis O (see FIG. 1(D)). Due to the convex portion 14 provided on the inner wall 120 of the connecting portion 12, the seismic isolator 1 can be attached to the leg portion 20 only when the convex portion 14 is positioned in the opening of the U-shaped leg portion 20. This makes it possible to prevent the seismic isolator 1 from being erroneously attached to the leg portion 20.

The pair of columns 13 are integrally formed on the upper surface 100 of the plate-shaped main body 10. As shown in FIG. 2, the leg 20 of the storage shelf 2 has a U-shaped cross section perpendicular to the axis O (see FIG. 1(D)), and both ends 200 are bent inwardly into an L-shape. The pair of columns 13, together with the pair of side walls 11 and the connecting portion 12, sandwich both ends 200 of the L-shape of the leg 20 of the storage shelf 2 placed on the mounting surface 101 of the plate-shaped main body 10. This prevents the seismic isolation device 1 attached to the leg 20 of the storage shelf 2 from rattling. Note that here, a pair of columns 13 are provided corresponding to both ends 200 of the leg 20 of the storage shelf 2, respectively, but both ends 200 of the leg 20 of the storage shelf 2 may be sandwiched together with the pair of side walls 11 and the connecting portion 12 by a single column.

The above describes one embodiment of the present invention.

In this embodiment, when a large vibration occurs on the installation surface 3 on which the storage shelf 2 is installed, the sliding surface 103 of the synthetic resin plate-shaped body 10 slides against the installation surface 3, thereby preventing the vibration from being transmitted to the storage shelf 2. In addition, since a plurality of notches 105 are formed on the edge 104 of the sliding surface 103 corresponding to the corner α of the storage shelf 2, the contact area at the edge 104 of the sliding surface 103 can be reduced to reduce the friction coefficient. For this reason, for example, in a case where the storage shelf 2 is tilted due to seismic motion and the load of the storage shelf 2 is concentrated on the edge 104 of the sliding surface 103, the sliding surface 103 slides more easily against the installation surface 3, so that the moment about the end of the storage shelf 2 in the vibration direction of the installation surface 103 as the center of rotation is suppressed from being generated in the storage shelf 2, and the storage shelf 2 can be prevented from falling over. Therefore, according to this embodiment, it is possible to more reliably prevent the vibration of the installation surface 3 due to an earthquake or the like from being transmitted to the storage shelf 2.

In addition, in this embodiment, a recess 107 is formed in the sliding surface 103, so that the contact area over the entire surface of the sliding surface 103 can be reduced, further reducing the coefficient of friction. As a result, when a large vibration occurs on the installation surface 3 on which the storage shelf 2 is installed, the sliding surface 103 can slide more easily against the installation surface 3, so that the vibration can be more efficiently prevented from being transmitted to the storage shelf 2.

The present invention is not limited to the above-described embodiment, and many variations are possible within the scope of the invention.

For example, in the above embodiment, a solid lubricant such as polytetrafluoroethylene resin or paraffin-based wax may be embedded in the notches 105 formed in the edge 104 of the sliding surface 103 of the plate-shaped body 10 so that its end face is exposed on the sliding surface 103. In this way, for example, in a case where the storage shelf 2 tilts due to earthquake motion and the load of the storage shelf 2 is concentrated on the edge 104 of the sliding surface 103, the solid lubricant embedded in the notches 105 makes it easier for the sliding surface 103 to slide against the installation surface 3, so that the storage shelf 2 can be prevented from tipping over more efficiently. The solid lubricant may be formed integrally with the plate-shaped body 10 by insert molding.

In addition, in the above embodiment, the multiple notches 105 formed on the edge 104 of the sliding surface 103 of the plate-shaped body 10 may be filled with lubricating grease. Even in this case, for example, if the storage shelf 2 tilts due to earthquake motion and the load of the storage shelf 2 is concentrated on the edge 104 of the sliding surface 103, the lubricating grease filled in the notches 105 makes it easier for the sliding surface 103 to slide against the installation surface 3, so that the storage shelf 2 can be prevented from tipping over more efficiently.

In the above embodiment, three notches 105 are formed on each of the three sides 104a to 104c, including the two sides 104a, 104b that correspond to the corner α of the storage shelf 2, among the four sides 104a to 104d that constitute the edge 104 of the sliding surface 103. However, the present invention is not limited to this. It is sufficient that at least one notch is formed on each of the two sides 104a, 104b that correspond to the corner α of the storage shelf 2. For example, as in modified example 1a of the seismic isolator 1 shown in FIG. 5, one notch 105a may be formed on each of the three sides 104a to 104c, including the two sides 104a, 104b that correspond to the corner α of the storage shelf 2.

In the above embodiment, among the four sides 104a to 104d constituting the edge portion 104 of the sliding surface 103, two sides 104a, 104b corresponding to the corner portion α of the storage shelf 2 may be provided with a notch such that the area of the notch increases from the center side of the sliding surface 103 toward the edge portion 104. For example, as in the modified example 1b of the seismic isolator 1 shown in FIG. 6, a triangular notch 105b having an apex on the center side of the sliding surface 103 may be provided on each of the three sides 104a to 104c including the two sides 104a, 104b corresponding to the corner portion α of the storage shelf 2. Alternatively, as in the modified example 1c of the seismic isolator 1 shown in FIG. 7, an arc-shaped notch 105c with a chord located on the edge portion 104 of the sliding surface 103 may be provided on each of the three sides 104a to 104c including the two sides 104a, 104b corresponding to the corner portion α of the storage shelf 2.

In this way, for example, in the case where the storage shelf 2 tilts due to seismic motion and the load of the storage shelf 2 is concentrated on the edge 104 of the sliding surface 103, the greater the tilt of the storage shelf 2, the smaller the contact area of the sliding surface 103 and the smaller the coefficient of friction. Therefore, the greater the tilt of the storage shelf 2, the more the moment generated in the storage shelf 2 about the end of the storage shelf 2 as the center of rotation in the swaying direction of the installation surface 103 is suppressed, and the storage shelf 2 can be prevented from tipping over.

In the above embodiment, the seismic isolation device 1 is attached to the legs 20 at the four corners of the storage shelf 2. However, the present invention is not limited to this and can be applied to seismic isolation objects that do not have legs at the four corners. In other words, the seismic isolation device of the present invention can be attached to the underside of a seismic isolation object such as fixtures, furniture, electrical equipment, etc., and can be interposed between the seismic isolation object and the installation surface on which the seismic isolation object is installed, protecting the seismic isolation object from shaking of the installation surface due to an earthquake, etc.

When attaching the seismic isolation device of the present invention to a seismic isolation object that does not have legs at the four corners, for example, instead of forming a pair of side wall portions 11 and connecting portions 12 on the upper surface 100 of the plate-shaped main body 10, the seismic isolation device may be attached to the underside of the seismic isolation object by using the mounting surface 101 provided on the upper surface 100 of the plate-shaped main body 10 as the adhesive surface and positioning the notch portion 105 formed on the edge portion 104 of the sliding surface 103 at the corner portion α of the seismic isolation object.

1: Seismic isolation device 2: Storage shelf 3: Installation surface 10: Plate-shaped main body 11: Side wall portion 12: Connection portion 13: Pillar portion 14: Convex portion 20: Leg portion
100: Upper surface of plate-shaped main body 10 101: Placement surface 102: Lower surface of plate-shaped main body 10 103: Sliding surface 104: Edge portion of sliding surface 103 104a to 104d: Sides constituting edge portion 104 105: Notch portion 106: Central portion of sliding surface 103 107: Recess 110: Snap-fit portion 120: Inner wall of connecting portion 12 200: End portion of leg portion 20

Claims (9)

A seismic isolation device attached to each of the four corners of a seismic isolation object and interposed between the seismic isolation object and an installation surface on which the seismic isolation object is installed,
A plate-shaped body made of synthetic resin having an upper surface formed with a mounting surface on which the seismic isolation object is placed and a lower surface formed with a sliding surface that slides against the installation surface;
A cutout portion is formed on an edge of the sliding surface corresponding to a corner of the seismic isolation object to which the seismic isolation device is attached, so as not to reach an area between the seismic isolation object placed on the placement surface and the installation surface .
A seismic isolation device characterized by the above. A seismic isolation device attached to each of the four corners of a seismic isolation object and interposed between the seismic isolation object and an installation surface on which the seismic isolation object is installed,
A plate-shaped body made of synthetic resin having an upper surface formed with a mounting surface on which the seismic isolation object is placed and a lower surface formed with a sliding surface that slides against the installation surface;
A notch portion is formed on an edge portion of the sliding surface corresponding to a corner portion of the seismic isolation object to which the seismic isolation device is attached, and the notch portion is
A seismic isolation device, characterized in that the area of the cutout portion increases from the center side to the edge side of the sliding surface. The seismic isolator according to claim 1 or 2 ,
The seismic isolation object is attached to each of the legs provided at the four corners,
A seismic isolation device characterized by further comprising a pair of side wall portions that sandwich the leg portion and a connecting portion that connects the pair of side wall portions, which are integrally formed on the upper surface of the plate-shaped body. A seismic isolation device is attached to each of the legs provided at the four corners of a seismic isolation object and is interposed between the seismic isolation object and an installation surface on which the seismic isolation object is installed,
A plate-shaped body made of synthetic resin having an upper surface formed with a mounting surface on which the seismic isolation object is placed and a lower surface formed with a sliding surface that slides against the installation surface;
A notch portion is formed on an edge portion of the sliding surface corresponding to a corner portion of the seismic isolation object to which the seismic isolation device is attached,
a pair of side walls that sandwich the leg portion and a connecting portion that connects the pair of side walls, the pair of side walls being integrally formed on an upper surface of the plate-like main body;
The plate-like main body has a rectangular shape,
The cutout portion is
Among the four sides constituting the edge portion of the sliding surface, three sides including two sides corresponding to the corners of the seismic isolation object to which the seismic isolation device is attached are formed,
The pair of side walls include
the notch portion is formed integrally on the upper surface of the plate-shaped main body along two opposing sides on which the notch portion is formed, among the four sides constituting the edge portion of the sliding surface;
The connecting portion is
A seismic isolation device characterized in that the notch portion is integrally formed on the upper surface of the plate-shaped main body along the four sides that constitute the edge of the sliding surface other than the three sides on which the notch portion is formed. A seismic isolation device is attached to each of the legs provided at the four corners of a seismic isolation object and is interposed between the seismic isolation object and an installation surface on which the seismic isolation object is installed,
A plate-shaped body made of synthetic resin having an upper surface formed with a mounting surface on which the seismic isolation object is placed and a lower surface formed with a sliding surface that slides against the installation surface;
A notch portion formed on an edge portion of the sliding surface corresponding to a corner portion of the seismic isolation object to which the seismic isolation device is attached;
a pair of side walls that sandwich the leg portion and a connecting portion that connects the pair of side walls, the pair of side walls being integrally formed on an upper surface of the plate-like main body;
The pair of side walls include
A seismic isolation device comprising an engaging portion that engages with an engaged portion provided on a leg of the seismic isolation object. A seismic isolation device is attached to each of the legs provided at the four corners of a seismic isolation object and is interposed between the seismic isolation object and an installation surface on which the seismic isolation object is installed,
A plate-shaped body made of synthetic resin having a mounting surface on an upper surface on which the seismic isolation object is placed and a sliding surface on a lower surface which slides against the installation surface;
A notch portion formed on an edge portion of the sliding surface corresponding to a corner portion of the seismic isolation object to which the seismic isolation device is attached;
a pair of side walls that sandwich the leg portion and a connecting portion that connects the pair of side walls, the side walls being integrally formed on an upper surface of the plate-like body;
A seismic isolation device characterized by having a column portion integrally formed on the upper surface of the plate-shaped body and, together with the pair of side wall portions, sandwiching the legs of the seismic isolation object , which has a U-shaped cross section perpendicular to the axis. The seismic isolator according to any one of claims 1 to 6 ,
A seismic isolation device, further comprising a solid lubricant embedded in the notch with an end face exposed from the sliding surface. The seismic isolator according to any one of claims 1 to 6 ,
The seismic isolation device further comprises lubricating grease filled in the notch. The seismic isolator according to any one of claims 1 to 8 ,
The seismic isolation device further comprising a recess formed on the sliding surface.

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