Pressure switch with diaphragm and adjustable contact

Claim 1

A pressure responsive electric switch assembly comprising a dielectric body member, a chamber in said body member, adjustable switch terminal means comprising a metal terminal post threadedly engaged in said dielectric body member with one end extending into said chamber, a thin flexible diaphragm arranged in said chamber said diaphragm comprising a dielectric polymer approximately 0.0025 inches thick and surfaced on the side opposite said adjustable switch terminal means with a coating of metal for contact therewith, and two air passages in said body member, one air passage opening at one end into said chamber and the opposite end of said one air passage having an unrestricted opening directly exposed to the atmosphere, the 2nd air passage intersecting said one air passage, said 2nd air passage being connected at one end to a continuous source of pressurized air and at the other end closed at a point beyond the intersection of the passages, the said one air passage exposing one side of said flexible diaphragm intermittently to positive and negative air pressure in accordance with the non-flow and flow respectively of air from said unrestricted opening to the atmosphere whereby the metal surfaced side of said diaphragm is selectively moved into and from electrical contact with said adjustable switch terminal means.