Respirator with speaking diaphragm

Claim 1

IN COMBINATION WITH A RESPIRATOR FACE PIECE HAVING A CIRCULAR OPENING FORWARDLY THEREOF, A SPEAKING DIAPHRAGM UNITARY ASSEMBLY COMPRISING A RING OF CHANNEL SHAPED CROSS-SECTION INTO THE CHANNEL OF WHICH THE FACE PIECE PORTION DEFINING SAID OPENING IS SNUGLY FITTED, A CYLINDRICAL SHELL INTEGRAL WITH ONE LEG OF THE CHANNEL OF SAID RING AND PROJECTING FORWARDLY OF SAID RESPIRATOR; A DISCSHAPED DIAPHRAGM MOUNTED COAXIALLY WITHIN SAID SHELL, A SEALING RING FOR PROVIDING A GAS-TIGHT SEAL BETWEEN SAID SHELL AND THE PERIPHERAL PORTION OF SAID DIAPHRAGM, A GUARD ELEMENT HAVING A RADIAL FLANGE PROVIDED WITH HOLES AND HAVING A CENTRAL OPENING, A CAP ELEMENT HAVING FINGERLIKE EXTENSIONS ON SPACED PERIPHERAL PORTIONS THEREOF EXTENDING THROUGH SAID HOLES AND BENT AT THE END PORTIONS THEREOF, SAID FINGER-LIKE EXTENSIONS HAVING SHOULDERS TO PROVIDE A SPACE EXTENDING RADIALLY OUTWARDLY BETWEEN SAID CAP ELEMENT AND SAID RADIAL FLANGE TO PERMIT VOICE SIGNALS TO EMERGE THERETHROUGH, THE OUTER EDGE OF SAID SHELL BEING ROLLED INWARDLY AGAINST THE PERIPHERAL PORTION OF SAID GUARD ELEMENT SO AS TO TIGHTLY SANDWICH SAID DIAPHRAGM BETWEEN SAID GUARD ELEMENT AND SAID SEALING RING.