Means for manually slow-closing a circuit breaker that has a spr

Details Means for manually slow-closing a circuit breaker that has a spr Means for manually slow-closing a circuit breaker that has a spr

1976-07-21

1979-01-30

Tudor, Harold

Electricity: circuit makers and breakers

Liquid contact

Time delay

185 40B, 200 50A, 200 50AA, H01H 300

Patent

active

041374363

ABSTRACT:
An operating device for an electric circuit breaker comprises a closing spring and a rotatable spring-controller mounted for rotation between first and second dead-center positions with respect to the spring. The spring is charged by transmitting rotational forces to the spring-controller through a main pawl mounted on the spring-controller and an abutment on a rotatable driving member. The main pawl is released from driven engagement with the abutment at the end of a spring-charging operation. Normal circuit-breaker closing is effected by allowing the spring to quickly discharge after a charging operation.
A manual slow-close operation of the circuit breaker is effected through an auxiliary pawl mounted on the spring-controller in a position angularly-spaced from the main pawl. During normal spring-charging and discharging operations, this auxiliary pawl is prevented from engaging the abutment on the driving member. But when a manual slow-close operation is to be effected, engagement between the auxiliary pawl and the abutment is allowed. Rotation of the driving member during such engagement rotates the spring-controller through a slow-close operation. This slow-close operation is effected without assistance from the closing spring since prior to the manual slow-close operation, the closing spring is disabled while in its charged condition and held disabled during the slow-close operation.

REFERENCES:
patent: 2909629 (1959-10-01), McCloud
patent: 3045083 (1962-07-01), Gamel et al.
patent: 3084238 (1963-04-01), Baskerville
patent: 3876847 (1975-08-01), Dykes
patent: 3905247 (1975-09-01), Cook

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