Respiratory devices

Claim 1

A RESPIRATORY DEVICE INCLUDING A BELLOWS, A PAIR OF BELLOWS ENDS ATTACHED TO THE ENDS OF SAID BELLOWS, A FACE MASK CONNECTED TO ONE OF SAID BELLOWS ENDS, A VALVE CHAMBER, A CONDUIT CONNECTING SAID VALVE CHAMBER TO THE INTERIOR OF SAID MASK, AN AIR CONDUIT EXTENDING FROM OUTER ATMOSPHERE AND TERMINATING IN SAID VALVE CHAMBER, A RESILIENT FLAP VALVE SECURED IN SAID VALVE CHAMBER, SAID VALVE MEMBER HAVING AN OPENING THERETHROUGH COMMUNICATING WITH THE INTERIOR OF SAID BELLOWS WHICH OPENING IS NORMALLY CLOSED BY SAID FLAP VALVE, SAID CONDUITS BEING NORMALLY CONNECTED THROUGH SAID VALVE CHAMBER, SAID FLAP VALVE BEING MOVABLE INTO POSITION TO CLOSE SAID AIR CONDUCT, WALLS IN SAID VALVE CHAMBER CONTACTING THE SIDE AND END EDGES OF SAID FLAP VALVE IN SEALING RELATION THEREWITH UNTIL SAID FLAP VALVE FLEXES INTO AIR CONDUIT CLOSING POSITION, FURTHER FLEXING OF SAID FLAP VALVE OPENING CONNECTION BETWEEN SAID FIRST NAMED CONDUIT AND THE INTERIOR OF SAID BELLOWS, AND MEANS OPERABLE FOR ADMITTING AIR INTO SAID BELLOWS UPON EXPANSION THEREOF.