Sumitomo Gomu Kogyo Kabushiki Kaisha

Sumitomo Kensetsu Kabushiki Kaisha

Yoshiaki Miyamoto

Teruo Sasaki

Kazuhiro Fujisawa

Seinosuke Kato

Makoto Sakuraoka

Akemi Kawanabe

Mitsuo Miyazaki

Yuji Mitsusaka

Fumiaki Arima

A shakeproof bearing or an earthquake-proofing structure (10) comprises a columnar bearing body (13) and a surrounding high damping elastomer (14). The bearing body (13) includes a stack of rigid plates (12) and elastic plates (11) alternating with one another. The high damping elastomer (14) may be shaped into an annular cylinder or, alternatively, may be in the form of a columnar stack of alternating annular rigid plates (18) and annular high-damping-elastomer plates (17).

Shakeproof bearing

The present invention relates to a vibration-proofing device which supports an upper structure, such as a building, computers and other machines or a floor having such machines mounted thereon, on a lower structure, as a foundation, to allow the upper structure to swing, thereby isolating earthquakes, traffic vibrations and vibrations from the equipment installed in another room so as to protect the upper structure from vibrations. The invention is to provide a bearing type of vibration-proofing device which is simple in construction and capable of reliably absorbing not only horizontal but also vertical components of earthquakes, traffic vibrations and other vibrations, whether they are weak or strong, and which properly operates under low load and produces little vibration during operation. The invention provides an arrangement wherein interposed between upper and lower structures are rolling bodies for horizontally supporting the upper structure for swing movement. The rolling bodies are in the form of cylindrical rollers, elastomeric bodies are interposed between the cylindrical rollers and the upper and lower structures. It is desirable that the cylindrical rollers be stacked in n rows and that these rows of cylindrical rollers form an angle of 180.degree. /n. An air spring or coil spring device is disposed vertically of the cylindrical rollers and a plurality of taper rollers is radially arranged in a horizonial plane vertically of the cylindrical rollers.

Vibration-proofing device

The present invention relates to an earthquake-proofing device wherein a superstructure is placed and supported for horizontal movement on a foundation structure so as to increase the natural vibration period of the superstructure, thereby protecting the superstructure against earthquake energy and traffic vibration. More particularly, the outer periphery of an elastic body, visco-elastic body or viscous body which hardly exhibits rigidity by itself is surrounded by a restrainer which restrains it from bulging outward, thereby enabling the body to develop high vertical rigidity while allowing it to retain horizontal deformability, the body being used as a load carrier. The restrainer and/or load carrier absorbs vibration energy by frictional damping action. According to this construction, besides the above-described basic performance essential to earthquake-proofing devices, there are the following advantages: (1) The points of action of the restoring force and damping force coincide with each other, so that the structure is protected against unnecessary torsional vibration; (2) the range of selection of materials for the load carrier is wide, so that characteristics can be designed in a wide range as desired; and (3). The initial shear rigidity at the start of vibration is so low that the structure can also be protected against slight vibration.

Earthquake-proofing device of peripherally restraining type

An earthquake-proofing device of peripherally restrained type including a laminate constructed by alternately laminating rigid plates and rubber-like elastic plates, the laminate being formed with a cylindrical hollow portion which opens at its opposite ends as viewed in the direction of lamination, and a visco-elastic body to be inserted into the cylindrical hollow portion to fill the latter. The earthquake-proofing device is characterized in that the volume of the visco-elastic body is greater than that of the cylindrical hollow portion by an amount corresponding to the product of the portion of the inner surface area of the cylindrical hollow portion opposed to the rubber-like elastic plates and 5-60% of the thickness of a single rubber-like elastic plate. The visco-elastic body having such excessive volume is pressed into the cylindrical hollow portion.

Growing community of inventors

Takarazuka, Japan

Yoshiaki Miyamoto