Circuit breaker

Details Circuit breaker Circuit breaker

2005-06-28

2005-06-28

Scott, James R. (Department: 2832)

Electricity: circuit makers and breakers

Toggle mechanisms

C200SDIG004, C335S191000, C337S070000

Reexamination Certificate

active

06911614

ABSTRACT:
A circuit breaker includes a fixed contact; a movable contact disposed in a rotary-type contact holder; a switching device; an operation handle; and an over-current tripping device. The operation handle is operated to open and close main-circuit contact points through the switching device. The switching device includes a handle lever connected to the operation handle; a toggle linkage having an upper toggle link and a lower toggle link; a switching spring placed between the handle lever and an arm connecting point of the toggle linkage; and a side plate for holding the components. The circuit breaker further includes a device for preventing the operation handle from moving to an off position when the contact points are stuck together. The device includes first stoppers formed on a cross bar of the contact holder and the handle lever facing the cross bar, and a second stopper formed on the side plate.

REFERENCES:
patent: 3605051 (1971-09-01), Casey et al.
patent: 3849751 (1974-11-01), Link et al.
patent: 4679016 (1987-07-01), Ciarcia et al.
patent: 5296664 (1994-03-01), Crookston et al.
patent: 5-182577 (1993-07-01), None

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