Pressure actuated electrical switch

Claim 1

A REMOTE ACTUATOR FOR CONTROLLING AN ELECTRICAL CIRCUIT, COMPRISING AN ELECTRICAL SNAP ACTION SWITCH HAVING RESILIENT MEANS BIASING SAID SWITCH TO A STABLE STATE, SAID RESILIENT MEANS HAVING A RELEASE FORCE LESS THAN THE HOLDING FORCE, A DIAPHRAGM ASSEMBLY INCLUDING A METAL DIAPHRAGM FORMING AN OUTER WALL OF A CHAMBER AND HAVING A FLUID CONNECTOR FOR CONNECTION OF SAID CHAMBER TO A FLUID SOURCE, SAID DIAPHRAGM HAVING A SELECTED SPRING FORCE IN EXCESS OF THE RELEASE FORCE AND LESS THAN THE HOLDING FORCE OF THE RESILIENT MEANS OF SAID SWITCH, AN OPERATING MEMBER SECURED TO THE DIAPHRAGM FOR MOVEMENT THEREWITH, MEANS TO VENT SAID CHAMBER TO AN AMBIENT PRESSURE, AND PRESSURE SOURCE MEANS CONNECTED TO THE FLUID CONNECTOR AND HAVING MEANS TO APPLY A POSITIVE PRESSURE PULSE TO SAID CHAMBER TO MOVE SAID SWITCH FROM SAID STABLE STATE, SAID DIAPHRAGM SERVING TO HOLD SAID SWITCH IN SAID ACTUATED STATE, SAID PRESSURE SOURCE MEANS HAVING MEANS TO APPLY A NEGATIVE PRESSURE PULSE TO SAID CHAMBER TO RETURN SAID SWITCH TO SAID STABLE STATE.