Cryogenic pressure switch

Claim 1

A PRESSURE SWITCH PROVIDING RESISTANCE TO VIBRATIONS AND TO LOW TEMPERATURE CONDITIONS, WHICH COMPRISES IN COMBINATION, A FLEXIBLE ACTUATING DIAPHRAGM HELD WITHIN A CONFINED HOUSING, AN ACTUATING FLUID PRESSURE INLET TO SAID HOUSING POSITIONED TO PROVIDE COMMUNICATION WITH ONE SIDE OF SAID DIAPHRAGM, COMPRESSIVE SPRING MEANS CONNECTING TO AND OPPOSING THE ACTION OF SAID FLEXIBLE DIAPHRAGM, SHAFT MEANS EXTENDING FROM A CENTRAL MOVABLE PORTION OF SAID DIAPHRAGM TO CONNECT WITH AND ACTUATE A SWITCH ARM, WITH THE LATTER BEING POSITIONED TO MOVE BETWEEN SPACED ELECTRICAL CONTACT POINTS RESPONSIVE TO PRESSURE CHANGES ON SAID DIAPHRAGM, SAID CONTACT POINTS FOR SAID SWITCH ARM CONNECTING WITH A MAGNETIC BALL RELAY OF SINGLE POLE, DOUBLE THROW TYPE FOR LATCHING IN BOTH OPERATING POSITIONS OF SAID SWITCH ARM, AND A SECOND FLEXIBLE DIAPHRAGM POSITIONED IN SAID HOUSING TO ENCLOSE A CONFINED DASH-POT ZONE, A FLUID MEDIUM IN SAID DASH-POT ZONE, CONTACT MEANS FROM SAID SECOND FLEXIBLE DIAPHRAGM TO BE CONNECTIVE WITH SAID SHAFT MEANS WHEREBY TO OPPOSE THE ACTION OF SAID ACTUATING DIAPHRAGM FOR MODULUS OF ELASTICITY COMPENSATION AND TO DAMP IT AGAINST VIBRATIONS.