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:
Dec. 03, 1996
Filed:
Dec. 17, 1993
George A Smith, N. Huntingdon Twp., Westmoreland County, PA (US);
Thomas K Fogle, Pittsburgh, PA (US);
Larry S Lakes, Tyner, KY (US);
Eaton Corporation, Cleveland, OH (US);
Abstract
An apparatus selectively connects a normal power line and an emergency power line to a load, and includes two interlocked switching mechanisms, each having individual interlocks, for selectively connecting the power lines to the load, and an interlock mechanism for interlocking the switching mechanisms in order that only one of the power lines at a time is connected to the load. The switching mechanisms may each have two drawout cassettes including associated switching devices for switching the power lines to the load and, also, including an isolated position for isolation of the associated switching device from at least one of the switched power lines and the load. Each switching device may be a circuit breaker having a trip unit for sensing current flowing from a power line to the load and tripping the circuit breaker. The interlock mechanisms may include keylock mechanisms which selectively disable closing of the switching devices. Each keylock mechanism may have individual locks on associated cassettes and a single key for operating only one of the locks. The individual interlocks of the switching mechanisms may cooperate with the keylock mechanisms to selectively disable connection of a power line to the load. Each key may be retained by an unlocked associated lock and may be removed from a locked associated lock.