Molded case circuit breaker having changing pivot locations for

Details Molded case circuit breaker having changing pivot locations for Molded case circuit breaker having changing pivot locations for

1993-07-29

1994-05-17

Barrett, Glenn J.

Electricity: circuit makers and breakers

Toggle mechanisms

200329, 200553, H01H 500, H01H 2300

Patent

active

053130332

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: 4158119 (1979-06-01), Krakik
patent: 4491814 (1985-01-01), Bellows
patent: 4642431 (1987-01-01), Tedesco et al.
patent: 4650944 (1987-03-01), Tedesco et al.

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