The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 20, 1994
Filed:
Jun. 19, 1992
Takuji Kobori, Tokyo, JP;
Koji Ishii, Tokyo, JP;
Motoichi Takahashi, Tokyo, JP;
Yoshinori Matsunaga, Tokyo, JP;
Naoki Niwa, Tokyo, JP;
Jun Tagami, Tokyo, JP;
Takayuki Mizuno, Tokyo, JP;
Kunio Furukawa, Kanagawa, JP;
Kajima Corporation, Tokyo, JP;
Kayaba Kogyo Kabushiki Kaisha, Tokyo, JP;
Abstract
A hydraulic cylinder type high damping device in which a cylinder member or a piston rod member is connected to the frame of a structure and the other member is connected to an earthquake-resisting element integrally secured to the frame. A plurality of passages through the piston connect hydraulic chambers on opposite sides of the piston. The passages are provided with pressure-governing valves which control the flow of oil between the hydraulic chambers. In addition, an accumulator system provides a bypass for oil to flow between the hydraulic cylinders in order to modulate the oil pressure in the damping device. Relief valves are provided in parallel with the pressure governing valves to provide a variable damping coefficient which protects the damping device from overloads caused by excessive seismic shock.