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US 4,899,323 AGranted
Anti-seismic device
AssigneeBridgestone Corporation
InventorsYoshihide Fukahori, Hiromu Kojima, Akihiko Ogino, Shigenobu Suzuki, Toshikazu Yoshizawa
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AssigneeBridgestone Corporation
InventorsYoshihide Fukahori, Hiromu Kojima, Akihiko Ogino, Shigenobu Suzuki, Toshikazu Yoshizawa
Estimating the term…
An anti-seismic device which comprises anti-seismic rubber bearings and dampers arranged in parallel, the anti-seismic rubber bearing being formed by laminating a plurality of rigid hard plates and soft boards having a viscoelastic property one over another, the damper being composed mainly of a viscoelastic material having the physical properties (i) and (ii) defined below. (i) the hysteresis ratio (h.sub.50) is greater than 0.3 at 50% tensile deformation at 25.degree. C. (ii) the storage modulus (E) measured dynamically at a frequency of 5 Hz, a strain of 0.01%, and a temperature of 25.degree. C. is in the range of 1.ltoreq.E.ltoreq.2.times.10.sup.4 (kg/cm.sup.2).
An anti-seismic device which comprises anti-seismic rubber bearings and dampers arranged in parallel, said anti-seismic rubber bearing being formed by laminating a plurality of rigid hard plates and soft boards having a viscoelastic property one over another, said damper being composed mainly of a viscoelastic material having the physical properties (i) and (ii) defined below.
Dependencies are inferred from the claim text.