Load transfer switch mechanism

Claim 1

IN A TRANSFER MECHANISM FOR TRANSFERRING A LOAD BEBWEEN FIRST AND SECOND POWER SUPPLIES, FIRST AND SECOND SWITCH MECHANISMS RESPECTIVELY OPERABLE TO CONNECT AND DISCONNECT A LOAD TO AND FROM SAID FIRST AND SECOND SUPPLIES, SAID SWITCH MECHANISMS EACH HAVING A TOGGLE MECHANISM CONNECTED TO A CONTACT ARM AND ADAPTED TO MOVE SAID ARM BETWEEN AN OPEN POSITION AND A CLOSED POSITION, AND ALSO HAVING A LEVER WITH A SPRING LINK BETWEEN SAID LEVER AND TOGGLE MECHANISM FOR SNAPPING SAID ARM FROM ONE OF SAID POSITIONS TO THE OTHER, SAID LEVER AND SPRING ARRANGED TO PERMIT MOVEMENT OF SAID LEVER TO A DEAD CENTER POSITION BEFORE SAID TOGGLE MECHANISM IS ACTUATED, MEANS RIGIDLY INTERLOCKING SAID ARMS FOR SIMULTANEOUS MOVEMENT THEREOF, WHEREBY ONLY ONE OF SAID ARMS MAY BE CLOSED AT ONE TIME, AND, MEANS OPERATIVELY INTERENGAGING SAID LEVERS FOR SIMULTANEOUS OPPOSED MOVEMENT OF SAID CONTACT ARMS WHEREBY WHEN ONE SWITCH IS OPENED THE OTHER IS CLOSED SAID MEANS OPERATIVELY INTERENGAGING SAID LEVERS COMPRISING A CRANK ARM WITH A PAIR OF CONNECTING LINKS PIVOTABLY CONNECTED THERETO WITH ONE OF SAID LINKS CONNECTED TO ONE SWITCH MECHANISM AND THE OTHER LINK CONNECTED TO THE OTHER SWITCH MECHANISM, SAID CRANK ARM CONSTRUCTED AND ARRANGED TO ROTATE OVER AN ARC OF 180* TO CAUSE EACH OF SAID SWITCH MECHANISM LEVERS TO PASS THROUGH SAID DEAD CENTER POSITIONS TO ACTUATE SAID TOGGLE MECHANISMS.