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. 10, 1983
Filed:
Feb. 12, 1980
Yutaka Kakehi, Kudamatsu, JP;
Katsuyuki Terada, Kudamatsu, JP;
Kenjiro Kasai, Kudamatsu, JP;
Keiichiro Torii, Kudamatsu, JP;
Toru Saito, Kudamatsu, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
An earthquake-resistant crane including a plurality of girders supported on wheels for movement along rails includes a vertical vibration damping device to ensure safe operation of the crane. The vertical vibration damping device includes a resilient support for supporting the girders in a vertical direction, a vibration direction converting arrangement mounted between the girders and the wheels for converting vertical vibrations of the girders to a horizontal displacement of the wheels, and drive control device connected to the wheels. The vertical vibration damping device operates such that the vertical vibrations of the girders are converted to a horizontal displacement of the wheels to dissipate the energy of vibrations by the sliding friction produced between the wheels and the rails when the wheels move in the horizontal direction, whereby the amplitude of vibrations produced in response to the vertical vibrations of the girders can be reduced.