Circuit breaker with improved contact arm follower spring arrangement

  • US 5,504,467 A
  • Filed: 03/30/1995
  • Issued: 04/02/1996
  • Est. Priority Date: 03/30/1995
  • Status: Expired due to Term
First Claim
Patent Images

1. A circuit breaker comprising:

  • a base;

    a contact arm pivotally attached to the base to pivot about a first axis between open and closed positions, the contact arm having a first longitudinal axis generally perpendicular with the first axis, and including first and second cam followers supported by the contact arm in a spaced relationship on a second axis parallel to the first axis;

    a crossbar including first and second cam surfaces, the crossbar being pivotally attached to the base to pivot between open and closed positions about a third axis parallel to the first axis; and

    a spring including a second longitudinal axis and attached to the contact arm and the crossbar such that the spring is located between the first and second cam followers, wherein the spring forces the first cam follower against the first cam surface and the second cam follower against the second cam surface with substantially equal force such that the contact arm moves to its open position when the crossbar is moved to its open position, and the contact arm is permitted to move to its open position while the crossbar is in its closed position.

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