Electricity: circuit makers and breakers – Interlocking – Between plural switches
Patent
1977-09-19
1980-03-18
Hall, George T.
Electricity: circuit makers and breakers
Interlocking
Between plural switches
220326, 220366, H01H 922, H01H 920
Patent
active
041941004
ABSTRACT:
The following specification describes a circuit breaker enclosure having a cover, which is latched closed by spring biased latch handles. The handles and cover move in response to gas pressure for relieving the pressure generated on tripping of the circuit breaker. The latch handles are arranged to point outwardly of the enclosure, when open, to provide a clear visual indication of their being open. The circuit breaker handle and enclosure handle are directly engaged with a common pivot pin for synchronous movement to enable the enclosure handle to indicate the trip condition of the breaker. When the cover is open, the handles are interlocked against movement to an ON position by a biased pivotable interlock plate. The cover in turn is latched closed through the interlock plate and a breaker handle plate, when the circuit breaker enclosure handles are in the ON position. A pair of spaced edge projections on the enclosure wall engage the cover sealing gasket to avoid a permanent compression set in the gasket.
REFERENCES:
patent: 3609261 (1971-09-01), Rys
patent: 3768321 (1973-10-01), Cox
patent: 3777084 (1973-12-01), Rys
patent: 3911235 (1975-10-01), Venzke et al.
patent: 4104491 (1978-08-01), Dulle
patent: 4107488 (1978-08-01), Keller et al.
patent: 4109819 (1978-08-01), Kushman et al.
Cox Russell
Drilling Joseph C.
Stanback Harris I.
Golden Larry I.
Guttman Richard T.
Hall George T.
Lesser Norton
Square D Company
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