Two circuit door switch

Claim 1

A SWITCH COMPRISING A GENERALLY CYLINDRICAL INSULATING HOUSING WITH A CAVITY THEREIN, SAID CAVITY INCLUDING FIRST AND SECOND PAIRS OF ANGULARLY SPACED AND DIAMETRICALLY OPOSED LONGITUDINALLY EXTENDING INTERNAL CHANNELS FORMED IN THE INNER WALLS OF SAID CAVITY, A FIXED CONTACT POSITIONED IN EACH OF SAID CHANNELS THEREBY TO PROVIDE FIRST AND SECOND PAIRS OF DIAMETRICALLY OPPOSED FIXED CONTACTS, A DIAMETRICALLY OPPOSED PAIR OF EXTERNAL CHANNELS EXTENDING LONGITUDINALLY IN THE OUTER WALLS OF SAID HOUSING, SAID EXTERNAL CHANNELS BEING ANGULARLY SPACED FROM SAID INTERNAL CHANNELS, SAID INTERNAL AND EXTERNAL CHANNELS BEING GENERALLY PARALLEL TO THE AXIS OF SAID HOUSING, A PLUNGER EXTENDING AXIALLY THROUGH A WALL OF SAID HOUSING INTO SAID CAVITY AND GUIDED FOR MOVEMENT BY SAID CAVITY, A FIRST MOVABLE BRIDGING CONTACT ACTUATED BY SAID PLUNGER AND GUIDED FOR MOVEMENT WITHIN THE FIRST PAIR OF INTERNAL CHANNELS TO COOPERATE WITH THE FIRST PAIR OF FIXED CONTACTS THEREBY TO CONTROL A FIRST CIRCUIT, A SECOND MOVABLE BRIDGING CONTACT ACTUATED BY SAID PLUNGER AND GUIDED FOR MOVEMENT WITHIN THE SECOND PAIR OF INTERNAL CHANNELS TO COOPERATE WITH THE SECOND PAIR OF FIXED CONTACTS THEREBY TO CONTROL A SECOND CIRCUIT, AND A U-SHAPED MOUNTING SPRING FOR FASTENING SAID SWITCH WITHIN AN APERTURE OF A SUPPORTING PANEL, SAID SPRING HAVING A PAIR OF RESILIENT ARMS POSITIONED IN SAID EXTERNAL CHANNELS AND ENGAGED WITH THE PANEL APERTURE THEREBY TO FASTEN THE SWITCH TO THE PANEL, SAID ARMS INCLUDING A MEANS FOR HOLDING SAID ARMS WITHIN SAID EXTERNAL CHANNELS.