Servo controlled oxygen regulator

Claim 1

An oxygen regulator for use in an aircraft, comprising: a housing having a mixing chamber connected to a first inlet port through a first passageway, a second inlet port through a second passageway, and an outlet port adapted to be connected to a breathing means, said first inlet port being connected to a source of oxygen under pressure, said second inlet port being connected to ambient air, said mixing chamber being adapted to retain a breathable fluid under pressure capable of maintaining the physiological well being of a recipient; actuation means adjacent said first inlet port for controlling the flow of said oxygen into said first passageway; first wall means located in and separating a first chamber in said housing into a first sensing chamber and a first ambient chamber, said first sensing chamber being connected to said mixing chamber by a first sensing passage, said first sensing passage being adapted to carry a pressure signal representative of the breathable fluid under pressure in said mixing chamber to said first sensing chamber, said first wall means being responsive to and moved by a first pressure differential created between said first sensing chamber and said first ambient chamber by said pressure signal and ambient air; first valve means responsive to movement of said first wall means for allowing said oxygen flow to pass from said first passageway into said mixing chamber; second wall means located in and separating a second chamber in said housing into a second sensing chamber and a second ambient chamber, said second sensing chamber being connected to said mixing chamber by a second sensing passage, said second sensing passage being adapted to carry said pressure signal representative of the breathable fluid under pressure in said mixing chamber to said sensing chamber, said second wall means being responsive to and moved by a second pressure differential created between the second sensing chamber and said second ambient chamber by said pressure signal and ambient air; third wall means located in and separating a third chamber in said housing into an oxygen chamber and a third ambient chamber, said oxygen chamber being connected to said first passageway to receive said oxygen under pressure contained therein, said oxygen chamber being separated into a first section and a second section by a restriction, said restriction regulating the flow of oxygen under pressure from the first section into the second section, said third wall means moving in response to a third pressure differential created between the first and second sections of the oxygen chamber and said third ambient chamber; second valve means responsive to movement of said second wall means for communicating said second section of the oxygen chamber with said second sensing chamber to eliminate said third pressure differential; third valve means connected to said third wall means which iS now moved by a fourth pressure differential created between the first section and the second section and said third ambient chamber and the first section, said third valve means upon moving controlling the flow of ambient air from the third ambient chamber into said mixing chamber through said second inlet port; and control means responsive to changes in altitude for modifying the pressure signal communicated through said first sensing passage and the second sensing passage by proportionally restricting the creation of said first and second pressure differential respectively to allow ambient air and oxygen under pressure into said mixing chamber which satisfies the physiological needs of said recipient.