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. 15, 1992
Filed:
Feb. 27, 1992
Takuji Kobori, Tokyo, JP;
Koji Ishii, Tokyo, JP;
Motoichi Takahashi, Tokyo, JP;
Junichi Hirai, Tokyo, JP;
Yoshinori Adachi, Tokyo, JP;
Naoki Niwa, Tokyo, JP;
Shigeru Ariki, Tokyo, JP;
Toshiaki Kamei, Kangawa, JP;
Takeharu Shizume, Kangawa, JP;
Kajima Corporation, Tokyo, JP;
Kayaba Kogyo Kabushikikaisha, Tokyo, JP;
Abstract
A hydraulically-operated piston device installed between the frame of a structure and a vibration-resisting element provided separately from the frame varies the rigidity of the frame by changing the condition of connection between the frame and the vibration-resisting element. A valve controls the operation of the piston device and can be adjusted to change the coefficient of damping of the piston device. To obtain maximum rigidity of the frame, the piston is hydraulically locked in place. For maximum flexiblity of the frame, the piston can be hydraulically released from a locked position to move freely. Hydraulic resistance to movement of the piston can be graduated by metering the flow of oil into and out of the piston device. The coefficient of damping is a function of the metered flow of hydraulic fluid in the piston device.