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:
Oct. 26, 1999
Filed:
Jan. 14, 1997
Willie B Freeman, Irwin, PA (US);
ABB Power T&D Company Inc., Raleigh, NC (US);
Abstract
Disclosed is a seismic damper for ground equipment such as high voltage breakers and disconnect switches. The disclosed seismic damper is reactive to low frequency seismic disturbances and provides damping in response to both upward and downward vertical forces. The seismic damper is adapted to be connected to such equipment without modifying the equipment. When the seismic dampers are connected to the equipment, the equipment's natural frequency in response to seismic disturbances is reduced. This reduction results from the particular use of a stacked ring compression spring and the particular configuration and assembly of the components of the seismic damper.