JP2003172401A - Support device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a support device which hardly impaires its characteristics even if dust adheres, reduces an area of a slide face, and also reduces cost. <P>SOLUTION: This support device 10 is composed of a flat plate 20 and a support member 30 movable on the flat plate 20. The flat plate 20 is composed of a hard plate 21 such as a steel plate and a rubber layer 22 as a soft layer provided on an upper face of the hard plate 21. The support member 30 is provided with a recessed part 31 on its bottom face. A surface of the recessed part 31 is constituted by a slide member 32. The slide member 32 has a semispherical shell structure, and a stainless spherical body 33 is fitted in the slide member 32. This spherical body 33 abuts on the rubber layer 22. When vibration caused by earthquake occurs, the spherical body 33 rolls on the flat plate 20 to absorb the vibration of the earthquake. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bearing device, and more particularly to a bearing device suitable for making a building or mechanical equipment a seismic isolation structure.

[0002]

2. Description of the Related Art In order to make a building, mechanical equipment and the like a seismic isolation structure, a sliding bearing device in which a sliding bearing member is slidably arranged on a smooth plate is used. As the sliding bearing member, a member in which a low friction material layer such as polytetrafluoroethylene (PTFE) is provided on the lower surface of a laminated body of a hard plate such as a metal plate and a soft plate such as rubber is often used. As the smooth plate, a stainless plate is usually used.

In such a slide bearing device, when a vibration such as an earthquake occurs, the laminated body mounted with the PTFE material slides on the stainless steel plate which is a mating member, and the vibration force such as an earthquake is absorbed.

FIG. 2 is a sectional view showing a conventional slide bearing device.

A stainless steel smooth plate 2 is fixedly installed on a concrete base plate 1. A sliding bearing member 3 is slidably arranged on the smooth plate 2. The sliding support member 3 is a seismic isolation laminated body 4 in which a metal plate 4a such as an iron plate and a soft plate 4b such as rubber are laminated, and a fluororesin (for example, poly A sliding plate 5 made of a low friction material such as tetrafluoroethylene) and a metal flange 6 bonded to the upper surface of the laminate 4 by vulcanization adhesion or the like. The flange 6 has a bolt insertion hole for fixing a supported member 7 such as a building. At the time of an earthquake, the sliding support member 3 slides on the smooth plate (stainless plate) 2.

If the stainless steel plate is left exposed, dust, water and the like will be deposited on the smooth plate, and the original friction characteristics of the elastic slide bearing may change. Therefore, a cover for covering the elastic sliding bearing is necessary in terms of dustproofness, waterproofness, and appearance. As this cover, conventionally, a panel such as an acrylic plate is assembled with an adhesive, screws, or the like.

[0007]

Even if such a cover is provided, dust or the like may be accumulated on the smooth plate 2 and the characteristics of the sliding bearing may be impaired.

Further, in the above-mentioned conventional slide bearing device, the smooth plate 2 having a size of, for example, about 60 × 60 cm to 100 × 100 cm, and having an even upper surface and having a smooth surface is required, resulting in high cost. is there.

Although a rolling bearing device is also used as the bearing device, it needs to be treated like a precision machine, and a structure for preventing rusting and foreign matter mixing is required, which is also expensive. .

It is an object of the present invention to provide a bearing device in which the characteristics are hardly impaired even if dust or the like is attached, the area of the sliding surface is small, and the cost can be reduced.

[0011]

The bearing device of the present invention is a bearing device having a flat plate and a bearing member movable on the flat plate, wherein the bearing member has a substantially hemispherical recess on the bottom surface. A spherical body is rotatably fitted in the concave portion, and the spherical body is in contact with the upper surface of the flat plate.

In the bearing device of the present invention, the sphere rolls on the flat plate during vibration such as an earthquake, and the vibration such as an earthquake is absorbed. In this support device, since the sphere rolls on the flat plate, the sphere rolls smoothly even if dust or the like adheres to the upper surface of the flat plate. Therefore, a cover for covering the flat plate so that dust does not enter at all is unnecessary, and a cover having a simple structure is sufficient. Further, when the surrounding environment is a dust-free environment, the cover may not be provided. Therefore, the manufacturing cost of the bearing device is low.

[0013]

DETAILED DESCRIPTION OF THE INVENTION Embodiments will be described below with reference to the drawings. FIG. 1 is a sectional view of a bearing device according to an embodiment.

The support device 10 comprises a flat plate 20 and a support member 30 movable on the flat plate 20. Flat plate 2
0 is composed of a hard plate 21 such as a steel plate, and a rubber layer 22 as a soft layer provided on the upper surface of the hard plate 21.

The support member 30 may be made of a rigid body (for example, metal) or may be a seismic isolation structure in which a metal plate and a rubber layer are laminated.

The support member 30 has a recess 31 on its bottom surface.
Is equipped with. The surface of the recess 31 is made of a sliding material 32 made of a low friction material such as fluororesin (eg polytetrafluoroethylene). The sliding member 32 has a hemispherical shell structure, and a spherical body 33 made of stainless steel is fitted into the sliding member 32. The sphere 33 is in contact with the rubber layer 22. A flange 34 is provided on an upper portion of the support member 30, and is fixed to a support member 7 such as a building or mechanical equipment by a bolt 35.

In the bearing device configured as described above,
At the time of vibration such as an earthquake, the spherical body 33 rolls on the flat plate 20, and the vibration such as the earthquake is absorbed. In this support device, the spherical body 33 rolls on the flat plate 22, so that the spherical body 33 rolls smoothly even if dust or the like adheres to the rubber layer 22 forming the upper surface of the flat plate 22. Therefore, a cover that covers the flat plate 20 to prevent dust from entering at all is unnecessary, and a cover having a simple structure is sufficient. Further, when the surrounding environment is a dust-free environment, the cover may not be provided.

In this bearing device, the surface area of the sliding member 32 sliding on the spherical body 22 is as small as 1/2 of the surface area of the spherical body 33, and the sliding member 32 itself can be small, so that the cost is low. is there.

Although the spherical body 33 is made of stainless steel in the above embodiment, it may be a steel ball other than stainless steel having a rust preventive coating film formed thereon.

In the above embodiment, the sliding member 32 is half the size of the spherical body 33, but may be smaller than the spherical body 33 as long as the spherical body 33 is held so as not to come off. Also, sphere 3
If the structure is such that 3 can be taken in and out, the sliding member may be larger than a hemisphere.

In the above embodiment, the sliding member 32 has a hemispherical shell shape, but the sliding member may have a cylindrical shape, a rectangular parallelepiped shape or a cubic shape, and a hemispherical concave portion is formed on the bottom surface thereof.

In this embodiment, since the upper surface of the flat plate 20 is the rubber layer 22, the spherical body 33 does not slip,
The sphere 33 always rolls on the flat plate 20 at the time of an earthquake or the like. A soft synthetic resin other than rubber may be used.

[0023]

As described above, according to the present invention, the countermeasure against dust adhesion is unnecessary or simple, and the low-friction material is also small. Therefore, the overall structure is relatively simple and the cost is reduced. A possible bearing device is provided.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of a bearing device according to an embodiment.

FIG. 2 is a vertical sectional view of a bearing device according to a conventional example.

[Explanation of symbols]

1 Foundation floor 2 smooth plate 3 Sliding bearing members 5 Sliding plate 7 Supported members 10 Bearing device 20 flat plate 21 hard plate 22 Rubber layer 30 Support member 31 recess 32 sliding material 33 sphere

Claims (8)

[Claims] 1. A supporting device having a flat plate and a supporting member movable on the flat plate, wherein the supporting member has a substantially hemispherical recess on the bottom surface, and the spherical body is rotatably fitted in the recess. The bearing device is characterized in that the sphere is in contact with the upper surface of the flat plate. 2. The bearing device according to claim 1, wherein the flat plate includes a hard plate and a soft layer provided on an upper surface of the hard plate. 3. The bearing device according to claim 2, wherein the soft layer is a rubber layer. 4. The bearing device according to claim 1, wherein the sphere is made of stainless steel. 5. The bearing device according to claim 1, wherein the sphere is a steel ball having a coating film provided on the surface thereof. 6. The bearing device according to claim 1, wherein the surface of the recess is a smooth surface. 7. A bearing device according to claim 1, wherein the surface of the recess is made of a low friction material. 8. The bearing device according to claim 1, wherein a flange is provided on an upper surface of the bearing member.