Electricity: circuit makers and breakers – Interlocking – Between plural switches
Patent
1983-01-26
1984-12-25
Pellinen, A. D.
Electricity: circuit makers and breakers
Interlocking
Between plural switches
200 82R, 361 42, H01H 920
Patent
active
044905904
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.
REFERENCES:
patent: 2084877 (1937-06-01), Uhde
patent: 2389856 (1945-11-01), Jones
patent: 2750464 (1956-06-01), Viboud
patent: 2824978 (1958-02-01), Knudsen
Ginsburg Morris
Mitsubishi Denki & Kabushiki Kaisha
Pellinen A. D.
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