Contamination prevention device for diver's breathing apparatus

Details Contamination prevention device for diver's breathing apparatus Contamination prevention device for diver's breathing apparatus

1987-11-13

1989-04-11

Burr, Edgar S.

Surgery

Respiratory method or device

Including body or head supported means covering user's scalp

12820426, 12820524, A62B 1800

Patent

active

048196266

ABSTRACT:
A diver's mask for use in contaminated water includes a shroud (12) which manifolds the demand regulator exhale port (7) with a second exhale port (9) from the diver's oral
asal mask (2) to form a gas filled cavity (11). The shroud (12) has an outlet port (13) to the surrounding water (15). When the diver breathes out exhaled gas enters the cavity (11) and the pressure causes the non-return valve (14) of the outlet port (13) to open, allowing gas to escape from the cavity (11) into the surrounding water (15). When the diver stops exhaling, the pressure of the water (15) causes the non-re turn valve (14) to close, leaving a residue of exhaled gas in the cavity (11). When the diver inhales again, the outlet port non-return valve (14) prevents water being drawn into the cavity (11) and non-return valves (8,10) of the exhale ports (7,9) prevent the exhaled gas from being drawn back into the inhaled gas.

REFERENCES:
patent: 2906262 (1959-09-01), Braunstein
patent: 3028859 (1962-04-01), Mitchell
patent: 3050055 (1962-08-01), Vautiz
patent: 3343535 (1967-09-01), Plytle et al.
patent: 3348539 (1967-10-01), McDonald
patent: 3370586 (1968-02-01), Araqona et al.
patent: 3547146 (1970-12-01), Jones
patent: 3680555 (1972-08-01), Warncke
patent: 4250877 (1981-02-01), Owens et al.
patent: 4467797 (1984-08-01), Franke
patent: 4608976 (1986-09-01), Suchy

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