JPH058003B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a base isolation table for reducing the lateral shaking of an object due to ground vibrations caused by an earthquake.

BACKGROUND ART When ground vibration occurs due to an earthquake or the like, vases and other ornaments placed on tables, sideboards, etc., fall over due to the lateral shaking. In order to prevent this, conventional methods have been to place a rubber plate under these figurines to alleviate the lateral vibrations transmitted to the figurines, or to attach suction cups to the underside of the figurines to secure them to tables, etc. Was.

Problems to be Solved by the Invention However, with the above techniques, it is not possible to sufficiently reduce the horizontal shaking of the ornaments and prevent them from falling over, resulting in vases falling over and water scattering around the room, etc. There were cases where falling ornaments hit the body and was dangerous.

In view of these points, the present invention provides, in the event of an earthquake, etc.
To provide a seismic isolation stand that reduces the horizontal shaking of a vase, etc. placed on a table, etc., and prevents the vase, etc., from falling over.

Means for Solving the Problems In order to achieve the above object, the present invention includes a substrate,
It consists of a base plate disposed facing above the substrate, and at least three spherical members disposed interposed between the substrates, and the upper surface of the substrate is provided with at least spherical members arranged at equal intervals along the outer periphery of the substrate. Three circular dish-shaped recesses are formed, and similar circular dish-shaped recesses are formed on the lower surface of the base plate at positions corresponding to the respective dish-shaped recesses of the substrate along its outer periphery, and the base plate and Each of the dish-shaped recesses of the base plate is inclined with a gentle slope toward the center so that the center part of each recess is the deepest, and the spherical member is located between the opposite sides of the base plate and the base plate. At the position of each of the dish-shaped recesses, it is accommodated so that it can roll freely within each of the dish-shaped recesses by simultaneously rolling into contact with the bottom surface of each of the dish-shaped recesses, and the plate-shaped recesses of the base plate and base plate are The seismic isolation table is characterized in that a spherical member locking peripheral wall is provided at the periphery of the opening.

Effect According to the above configuration, when an object is placed on the base plate and the base plate shakes horizontally due to an earthquake or the like, the spherical member responds to the horizontal shake between the opposing recesses of the base plate and the base plate. However, the substrate rolls along the bottom surface of the recess, and the horizontal shaking of the substrate is absorbed by the spherical member. Therefore, the base plate hardly sways horizontally and the object does not fall over. When the earthquake stops and the horizontal shaking of the board stops, the spherical member returns to the center of the recess under the gravity of the object and the base plate, and the base plate and the base plate also return to their original resting positions.

In addition, if the diameter of the recess cannot be made large enough due to the dimensions of the substrate and base plate, the diameter of the spherical member, etc., the spherical member locking peripheral wall provided around the opening of the recess should be used to prevent large lateral vibrations. Therefore, the range of motion of the base plate relative to the substrate is appropriately limited, and at the same time, the spherical member is prevented from protruding from between the bottom surfaces of the recess. As a result, when a plurality of seismic isolation tables are used side by side, it is possible to prevent adjacent base plates from colliding with each other during vibration.

In addition, since the recesses are formed at regular intervals along the outer periphery of the upper surface of the substrate and the lower surface of the base plate, stability is very good.

Embodiments Hereinafter, embodiments of the present invention will be described with reference to the drawings.

In this embodiment, as shown in FIG. 1, the upper surface of a square substrate 1 is opposed to the lower surface of a square base plate 2. The substrate 1 is installed on the upper surface of a table 3, etc., and the base plate A vase 4, etc., is placed on the top surface of the container 2.

As shown in FIG. 3, four circular dish-shaped recesses 5 are formed at equal intervals along the outer periphery of the substrate 1 at the four corners of the upper surface of the substrate 1. Similarly, four circular dish-shaped recesses 6 are formed on the lower surface of the base plate 2. Also, between the concave portion 5 of the substrate and the concave portion 6 of the base plate that face each other,
Two spherical members 7 are accommodated. Further, the diameter of the spherical member 7 is smaller than the diameter of the recesses 5 and 6, so that the spherical member 7 can roll on the bottom surface of the recess.

Further, as shown in FIG. 4, the recesses 5 and 6
is inclined with a gentle slope toward the center so that the center is deepest, and the diameter of the spherical member 7 is larger than the sum of the depths of the center of the recesses 5 and 6. , the spherical member 7 rollably contacts between the bottom surfaces of the recess, and the spherical member 7 causes the base plate 2 to
It is now possible to support

In this case, when the bottom surfaces of the recesses 5 and 6 form part of a spherical surface, the radius of curvature of the bottom surface of the recess is made larger than the radius of curvature of the spherical member, and
The diameter of the spherical member 7 is set to be larger than the sum of the depths of the center portions of the recesses 5 and 6.

Furthermore, spherical member locking peripheral walls 5a and 6a are formed around the openings of the recesses 5 and 6.

In this example, the length L of one side of the substrate and the base plate is 30 cm, the interval r between the centers of the recesses is 20 cm, the diameter d of the recesses is 8 cm, the depth f of the centers of the recesses is 3.5 mm,
The height h of the peripheral wall was 1 mm, and the diameter 1 of the spherical member was 10 mm.

According to the above configuration, when the substrate 1 is stationary, the spherical member 7 is stationary at the center between the recesses due to the gravity of the base plate 2 and the vase 4, as shown in FIG. At the same time, the substrate 1 and the base plate 2 are
Take a resting position as shown in FIG. When ground vibration occurs due to an earthquake or the like, for example, as shown in FIG. 2, the table 3 etc. shakes horizontally in the direction of the arrow, and the board 1 shakes integrally with the table 3 in the direction of the arrow. As shown in FIG. 5, between the opposing recesses of the substrate 1 and the base plate 2, the spherical member 7
rolls along the bottom of the recess from its rest position, the horizontal shaking of the base plate 1 is absorbed, and the base plate 2 and vase 4 hardly follow this movement, and the base plate 2
The rolling of the spherical member 7 and the displacement of the concave portion 5 of the substrate are repeated in a substantially stationary state. In this way, the horizontal vibration transmitted to the base plate 2 is suppressed to a minimum, so that the vase 4 does not fall.

In this case, the diameter of the recesses 5 and 6 is
If the diameter of the spherical member 7 is sufficiently larger than the diameter of the spherical member 7, the above-mentioned seismic isolation effect can be exerted without being locked by the spherical member locking peripheral walls 5a and 6a even in the case of large horizontal shaking. On the other hand, if the diameters of the recesses 5 and 6 cannot be made sufficiently large due to the dimensions of the substrate 1 and the base plate 2, the diameter of the spherical member 7, etc., the movement of the base plate 2 with respect to the base plate 1 in response to large horizontal vibrations may occur. The range is limited and the spherical member is prevented from jumping out of the concave groove. Therefore, when a plurality of base isolation tables are used side by side, if each base isolation base is arranged at appropriate intervals, it is possible to prevent adjacent base plates from colliding with each other during vibration.

When the earthquake stops and the horizontal shaking of the board 1 stops, the spherical member 7 receives the gravity of the vase 4 and the base plate 2 and returns to the center of the recess, and the base plate 1 and the base plate 2 also return to their original resting positions. to return to.

In this embodiment, the height of the top surface of the base plate 2 is 46
As a result of experimenting with a vase with a base diameter of 15 cm, it was found that it was seismically isolated even against horizontal shaking equivalent to a seismic intensity of 8.

In this experimental example, the number of spherical members accommodated between the opposing recesses was set to one, but as shown in Fig. 6, the same effect can be obtained even if three spherical members are accommodated between the recesses. be able to.

Furthermore, the shapes of the substrate and the base plate, and the number and arrangement of recesses are not limited to those in this embodiment. As shown in FIGS. 7 and 8, both the base plate and the base plate are circular. Alternatively, the three recesses may be arranged at the vertices of an equilateral triangle.

Effects of the Invention As described above, the present invention has the upper surface of the substrate facing the lower surface of the base plate, and the spherical member interposed between the bottom surfaces of the dish-shaped recess on the upper surface of the base plate and the bottom surface of the dish-shaped recess on the lower surface of the base plate. Even if the table etc. shakes sideways due to
Since the horizontal vibration transmitted to the base plate is kept to a minimum, a vase placed on the base plate will not fall over.

Further, since the present invention has a simple structure, it is easy to manufacture and has a low manufacturing cost, and is also applicable to a wide range of applications, such as installation stands for vending machines, bases of buildings, etc.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing one embodiment of the present invention, FIG. 2 is a perspective view showing a state in which the board of the same embodiment has been moved due to horizontal shaking, and FIG. FIG. 4 is a cross-sectional view showing the relationship between the opposing recesses of the base plate and the base plate of the same embodiment and the spherical member, and FIG.
FIG. 6 is a perspective view showing another embodiment of the present invention; FIG. FIG. 8 is a perspective view showing the embodiment, and FIG. 8 is a top view showing the arrangement of the substrate recess and the spherical member of the same embodiment. 1...Substrate, 2...Bed plate, 5, 6...Recess, 5
a, 6a... Locking peripheral wall for preventing spherical member escape, 7...
...Spherical member.

Claims (1)

[Claims] 1 Consisting of a substrate, a base plate disposed facing above the base plate, and at least three spherical members interposed between the base plate and the base plate, and on the upper surface of the base plate, along the outer periphery. At least three circular dish-shaped recesses are formed at equal intervals, and similar circular dish-shaped recesses are formed on the lower surface of the base plate at positions corresponding to the respective dish-shaped recesses of the substrate along the outer periphery thereof. each dish-shaped recess of the substrate and base plate is formed;
Each of the spherical members is inclined with a gentle slope toward the center so that the center thereof is the deepest, and the spherical member is at the position of each of the dish-shaped recesses facing each other in the base plate and the base plate. The spherical member locking peripheral wall is housed in such a manner that it can roll freely in each of the dish-shaped recesses by simultaneously rolling into contact with the bottom surface of each of the dish-shaped recesses, and a spherical member locking peripheral wall is provided at the opening periphery of the dish-shaped recess of the base plate and the base plate. A seismic isolation platform is provided.