A current limiting circuit interrupter includes two parallel pivoting contact arms carrying contacts at the ends thereof. The upper contact arm is pivoted upon a carriage which is in turn pivotally mounted upon a mechanism frame. A latch rod is movably secured in arcuate slots in the sides of the mechanism...http://www.google.com.au/patents/US4259651?utm_source=gb-gplus-sharePatent US4259651 - Current limiting circuit interrupter with improved operating mechanism
