Molded case circuit breaker with handle lock

Details Molded case circuit breaker with handle lock Molded case circuit breaker with handle lock

1985-04-03

1985-11-19

Shepperd, John W.

Electricity: circuit makers and breakers

Switch activation inhibitor

Actuator locking device

H01H 928

Patent

active

045544212

ABSTRACT:
A molded case circuit breaker includes a handle lock or locking mechanism for preventing unauthorized use of the circuit breaker. The locking mechanism includes a lock cover disposed over a manually engagable handle of the circuit breaker and a spring biased locking cylinder and spindle assembly disposed normally above the lock cover and movable along an elongated slot formed through the lock cover. The cylinder and spindle assembly is mechanically connected to the handle for movement in unison therewith. The elongated slot includes an enlarged locking portion that is located along the lock cover in a position corresponding to the OFF position of the handle and the OPEN position of the separable electrical contacts of the circuit breaker. An elongated cylinder of the cylinder and spindle assembly is receivable through the locking portion of the elongated slot and when retained therein prevents substantial movement of the handle from its OFF position.

REFERENCES:
patent: 3171908 (1965-03-01), Malota
patent: 3260808 (1966-07-01), Dimond et al.
patent: 3816686 (1974-06-01), Budd et al.
patent: 3833784 (1974-09-01), Bobel et al.
patent: 4271342 (1981-06-01), Sistare

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