Breathing oxygen mask inhalation and exhalation diaphragm valve unit

Claim 1

A PRESSURE OPERATED INHALATION AND EXHALATION DEVICE FOR HIGH ALTITUDE OXYGEN GAS MASKS COMPRISING, A CLOSED CASING, DIAPHRAGM VALVE MEANS THEREIN COMPRISING A PAIR OF PARALLEL SPACED FLEXIBLE DIAPHRAGM VALVES DISPOSED ACROSS SAID CASING DIVIDING THE SAME INTO SPACED INHALATION AND PRESSURE EQUALIZING CHAMBERS AND AN INTERMEDIATE EXHALATION CHAMBER, AN OXYGEN SUPPLY CONDUIT ADAPTED TO BE CONNECTED AT ONE END TO A PREDETERMINED LOW PRESSURE OXYGEN SUPPLY MEANS, SAID CONDUIT HAVING BRANCH CONDUITS THEREFROM DISPOSED IN OPEN COMMUNICATION WITH SAID INHALATION CHAMBER AND WITH SAID PRESSURE EQUALIZATION CHAMBER RESPECTIVELY, AN INHALATION AND EXHALATION CONDUIT CONNECTED AT ONE END TO SAID CASING IN OPEN COMMUNICATION WITH THE INTERIOR OF SAID EXHALATION CHAMBER HAVING AN OPPOSITE END ADAPTED TO BE CONNECTED TO A HIGH ALTITUDE GAS MASK, A BRANCH CONDUIT CONNECTED IN OPEN COMMUNICATION WITH SAID INHALATION AND EXHALATION CONDUIT INTERMEDIATE THE ENDS THEREOF, SAID BRANCH CONDUIT EXTENDING THROUGH SAID INHALATION CHAMBER HAVING A CONCENTRIC VALVE SEATING INLET PORT FACING SAID DIAPHRAGM MEANS AND OPENED OR CLOSED BY OPPOSITE DEFLECTIONS OF THE DIAPHRAGM VALVE BETWEEN SAID INHALATION AND EXHALATION CHAMBERS, TOWARD OR AWAY FROM SAID EXHALATION CHAMBER, AN EXHALATION TUBE OPEN TO AMBIENT ATMOSPHERE AT ONE END, EXTENDING INTO SAID EXHALATION CHAMBER HAVING AN OUTLET VALVE SEAT CONCENTRICALLY FACING THE OTHER DIAPHRAGM VALVE, AND OPENED OR CLOSED THEREBY INCIDENT TO DEFLECTION OF THAT DIAPHRAGM VALVE AWAY FROM OR TOWARD THE OTHER DIAPHRAGM VALVE, EXTENSIBLE RESILIENT BELLOWS MEANS CONCENTRICALLY FIXED IN SAID CASING IN SAID EQUALIZING CHAMBER HAVING AN INNER CLOSED END AND AN OUTER END OPEN TO THE AMBIENT ATMOSPHERE EXTERIOR OF SAID CASING, AND A POSITIVE ACTUATING CONNECTION BETWEEN THE CLOSED INNER END OF SAID BELLOWS MEANS AND THE DIAPHRAGM VALVE LOCATED BETWEEN THE EXHALATION CHAMBER AND THE EQUALIZATION CHAMBER FOR TENSIONING THE LATTER DIAPHRAGM IN PREDETERMINED RELATION TO THE PRESSURE DIFFERENTIAL BETWEEN THE AMBIENT AIR EXTERIOR OF SAID CASING AND THE OXYGEN PRESSURE IN THE EQUALIZATION CHAMBER FROM THE OXYGEN SUPPLY MEANS TO CONTROL THE OPENING AND CLOSING DEFLECTIONS OF SAID LATTER DIAPHRAGM VALVE MEANS ON SAID EXHALATION TUBE OUTLET VALVE SEAT IN PREDETERMINED RATIO TO SAID PRESSURE DIFFERENTIAL.