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:
May. 02, 1995
Filed:
Feb. 11, 1993
Mitsuo Sakamoto, Tokyo, JP;
Norihide Koshika, Tokyo, JP;
Isao Nishimura, Tokyo, JP;
Katsuyasu Sasaki, Tokyo, JP;
Satoshi Orui, Tokyo, JP;
Kajima Corporation, Tokyo, JP;
Abstract
A vibration control device of an active type for a structure comprising a first additional mass body movable relative to the structure; spring means for giving a period to the additional mass body which synchronizes with the natural period of the structure; a second additional mass body supported by and movable relative to the first additional mass body; and drive means for applying a control force between the first and second additional mass bodies in response to a sensed vibrations of an earthquake or the like. Laminated rubber support provides main spring means for synchronizing with the assumed natural period of the structure. Auxiliary spring means, such as laminated rubber or coil springs, is separately provided for fine tuning the period of the device. The responses from the structure are reduced by adjusting the difference between the assumed and actual natural periods of the structure by use of the auxiliary spring means and by providing the control force from the drive means.