Molded case circuit breaker having rectangular knee pin non-rota

Electricity: circuit makers and breakers – Toggle mechanisms

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Details

200337, 74 96, 74 971, 74520, 403 66, H01H 2304

Patent

active

053191692

ABSTRACT:
A molded case circuit breaker having an operating mechanism including a collapsible toggle linkage, an operating handle and a movable frame. The collapsible toggle linkage includes a rectangular cross section knee pin non-rotatably held within an open rectangular slot in an upper link of the linkage. The operating handle pivots about a first pivot point when moving between ON, OFF and TRIPPED positions. The operating handle pivots about a second pivot point when moving to a RESET position thereby reducing the lateral force component of the operating springs of the operating mechanism for reliable return of the handle to the OFF position. Also, bifurcated movable contact fingers are provided for pivotal movement about a fixed pin to break contact welds and a trapezoidal cross section shaft interconnects the movable contact fingers.

REFERENCES:
patent: 1633812 (1927-06-01), Goff
patent: 2889428 (1959-06-01), Kingdon et al.
patent: 3301985 (1967-01-01), Wilson
patent: 3401363 (1968-09-01), Vyskocil et al.
patent: 3470507 (1969-09-01), Hall et al.
patent: 3562469 (1971-02-01), Peck
patent: 3768321 (1973-10-01), Cox
patent: 4642430 (1987-02-01), Tedesco

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