Electric circuit interrupter

Claim 1

AN ELECTRIC CIRCUIT INTERRUPTER CONTACT STRUCTURE COMPRISING: A BASE MEMBER; A RELATIVELY STATIONARY CONTACT MEMBER MOUNTED ON THE BASE MEMBER; A PAIR OF SPACED-APART LUGS MOUNTED ON THE BASE MEMBER IN SPACED RELATION TO THE STATIONARY CONTACT MEMBER; A PIVOT PIN SUPPORTED BY THE LUGS TO SPAN THE SPACE THEREBETWEEN; A RELEASABLE CLAMP CONNECTED TO THE PIVOT PIN INTERMEDIATE THE LUGS TO PREVENT AXIAL MOVEMENT OF SAID PIN, THE CLAMP COMPRISING A RESILIENT COIL ENCIRCLING THE PIN AND HAVING TANGENTIALLY EXTENDING OPPOSITE ENDS DISPOSED IN A COOPERATING RELEASABLY SELF-MAINTAINED POSITION WHEREIN THE CIRCUMFERENCE OF THE COIL IS CONTRACTED SO THAT THE COIL IS FIRMLY GRASPING THE ENCIRCLED PIN, SAID OPPOSITE ENDS BEING MOVABLE RELATIVE TO EACH OTHER TO A DIFFERENT COOPERATING POSITION WHEREIN THE COIL CIRCUMFERENCE IS EXPANDED AND THE PIN THEREBY RELEASED FOR PURPOSES OF REMOVAL FROM SAID LUGS; A MOVABLE CONTACT ARM ROTATABLY MOUNTED ON THE PIVOT PIN AND DISPOSED IN COOPERATIVE RELATIONSHIP WITH THE STATIONARY CONTACT MEMBER; AND ACTUATING MEANS COUPLED TO THE MOVABLE CONTACT ARM FOR MOVING SAID ARM INTO AND OUT OF CIRCUIT MAKING ENGAGEMENT WITH THE STATIONARY CONTACT MEMBER.