Interlock for multi-pole circuit breakers

Claim 1

A COMMON TRIP INTERLOCK FOR ADJOINING CIRCUIT BREAKERS EACH HAVING A FIXED CONTACT, A MOVABLE CONTACT, A CARRIER FOR SAID MOVABLE CONTACT, MOVABLE CURRENT RESPONSIVE MEANS HAVING A LATCH ENGAGEABLE WITH SAID CARRIER FOR HOLDING SAID CONTACTS IN ENGAGED POSITION, SAID INTERLOCK COMPRISING, A TRIP ELEMENT AND AN OPERATOR ELEMENT PIVOTALLY MOUNTED BETWEEN SAID BREAKERS, ONE OF SAID ELEMENTS HAVING A CAM SURFACE AND THE OTHER OF SAID ELEMENTS HAVING A ROLLER ENGAGEABLE WITH SAID CAM SURFACE, A TRIP PIN ON SAID TRIP ELEMENT ENGAGEABLE WITH SAID CURRENT RESPONSIVE MEANS, AN OPERATOR PIN ON SAID OPERATOR ELEMENT ENGAGEABLE BY SAID CARRIER TO MOVE SAID OPERATOR ELEMENT FROM A "NON-TRIPPED" POSITION THROUGH A "TRIP" POSITION TO A "TRIPPED" POSITION, SAID OPERATOR ELEMENT CAUSING SAID TRIP ELEMENT TO MOVE FROM A "NON-TRIPPED" POSITION IN WHICH SAID TRIP ELEMENT PERMITS SAID CURRENT RESPONSIVE MEANS TO REMAIN LATCHED WITH ITS CARRIER, TO A "TRIP POSITION IN WHICH SAID TRIP PIN FIRST FORCES AID CURRENT RESPONSIVE MEANS TO MOVE OUT OF LATCHED ENGAGEMENT WITH ITS CARRIER AND THEN RETURNS TO ITS ORIGINAL POSITION IN WHICH SAID CURRENT RESPONSIVE MEANS IS IN AN UNSTRAINED POSITION.