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. 25, 1984
Filed:
Jan. 26, 1983
Setsuyuki Matsuda, Kobe, JP;
Mitsubishi Denki Kabushiki Kaisha, Tokyo, JP;
Abstract
The disclosed switching system comprises a circuit breaker, a grounding device, a locking device for the grounding device, and a fluid filled axially movable cylinder connected at one end to the circuit breaker and including at the other end a spring loaded piston connected to the locking device. When the circuit breaker is opened upon the occurrence of a fault on a mating electric path, the cylinder and then an internal piston is moved to release the locking device to ground the electric path through the closure of the grounding device which is then opened. After about one second determined by a first flow passageway for throttling a flow of fluid between two compartments of the cylinder disposed on both sides of the piston and a second flow passageway with a check valve extending between those compartments, the piston and the cylinder are returned back to their original positions to lock the grounding device in its open position by the locking device. The abovementioned cylinder may be replaced by a stationary cylinder including a first piston connected to the circuit breaker and a second piston loaded with a spring and connected to the locking device. The cylinder includes the two outermost compartments interconnected through a communicating tube and two compartments on both sides on the first piston bridged by a throttle device and a check valve.