Patent ID: 6087913
Filing Date: 2000-07-11
Classification: H01H

Abstract:
A mechanism for a multipole circuit breaker comprising:at least one side frame; cradle attached to said side frame, said cradle movable between a latched and tripped position;a toggle linkage formed by an upper link member having a first and second ends and rotatably attached at said first end to said cradle and a lower linkage having a first and second ends, said lower linkage first end being secured to said upper linkage second end by a spring spindle;a crank member being attached for rotation to said side frame and having a first and second ends, said crank first end being pivotally attached to said lower linkage second end by a pin and is attached to said side frame by a pivot;at least one rotary contact assembly mounted for rotation proximate to said crank, said contact assembly including a rotor movable between closed and open position and having an opposing first and second side faces, a contact arm having a first and second ends, said contact arm mounted for rotation to said rotor and at least one contact mounted to said contact arm on one of said ends;a handle lever attached for rotation to said side frame;a spring attached between said toggle linkage spring spindle and said handle lever;said crank first end is arranged such that a line between the center of said crank pivot and the center of said pin is perpendicular to a line of force created by said spring and transmitted through said lower link when said rotor is in the closed position.