Interlocking mechanism

Claim 1

IN COMBINATION WITH A PAIR OF CONTACTOR UNITS EACH HAVING AT LEAST ONE CONTACT ACTUATING ELEMENT DISPLACEABLE TO A DISPLACED POSITION IN AN ACTUATED CONDITION OF THE CONTACTOR UNIT, A BASE SUPPORTING BOTH UNITS, AND INTERLOCKING MECHANISM COMPRISING A PAIR OF MEMBERS MOUNTED FOR ROCKING ABOUT PARALLEL AXES ON SAID BASE, ARMS PROJECTING FROM THE RESPECTIVE MEMBERS IN MUTUALLY CROSSED RELATION, MEANS ACTUATED BY EACH ELEMENT ON DISPLACEMENT THEREOF TO ITS DISPLACED POSITION TO ROCK A RELATED ONE OF SAID MEMBERS FROM A FIRST TO A SECOND ANGULAR POSITION IN A DIRECTION TENDING TO MOVE THE RELATED ARM AWAY FROM ITS CROSSED RELATION WITH THE OTHER ARM, A PART ON EACH ARM PROJECTING TOWARDS THE OTHER ARM IN A DIRECTION GENERALLY PARALLEL TO SAID AXES AND SO POSITIONED THAT WITH BOTH MEMBERS IN THEIR FIRST POSITIONS SAID PARTS ARE CLEAR OF EACH OTHER SO THAT EITHER MEMBER CAN BE DISPLACED TO ITS SECOND POSITION, WHILE WITH ONE MEMBER IN ITS SECOND POSITION THE PROJECTING PART THEREOF STANDS IN THE PATH OF THE PROJECTING PART OF THE OTHER MEMBER WHEREBY THE LATTER CANNOT BE DISPLACED TO ITS SECOND POSITION AND SPRING MEANS FOR URGING EACH OF SAID MEMBERS TOWARD ITS FIRST POSITION.