Discrete-operating pneumatic element for logical function

Claim 1

A pneumatic discrete-operating device for carrying out logical functions, said device comprising a hollow body defining a chamber and having at least one inlet orifice for the delivery of a control airflow into said chamber, an outlet orifice coupled to an air pressure source for the delivery of air into said chamber at opposite ends thereof, and a diaphragm freely displaceable in said chamber and disposed between said inlet orifice and control orifice being located in said chamber at opposite ends thereof, and a diaphragm freely displaceable in said chamber and disposed between said inlet orifice and control orifice for displacement in said chamber, under the pressure of the air at said inlet and control orifices, away from the orifice with the higher pressure and toward the other orifice wither to control flow from the inlet orifice to the outlet orifice by approaching the inlet orifice and blocking flow therefrom or to move away from the inlet orifice and thus enable relatively unrestricted flow from the inlet orifice to the outlet orifice, said outlet orifice opening into the chamber at the same end at a position relative to the control orifice to be in communication therewith when the diaphragm blocks the inlet orifice whereby air may pass from the control orifice to the outer orifices, and at a position such that the diaphragm can simultaneously block the outlet and control orifices.