Underwater breathing apparatus

Details Underwater breathing apparatus Underwater breathing apparatus

1974-12-11

1976-07-13

Michell, Robert W.

Surgery

Truss

Pad

251 614, 137494, A62B 700

Patent

active

039687953

ABSTRACT:
Breathing gas from a remote source is supplied directly to a diver's helmet, without the requirement of a demand valve. Exhaust gas is returned back to the remote source through a series arrangement of a normally open fail-safe valve and an exhaust control valve which maintains the helmet pressure within predetermined limits relative to the ambient water pressure. Should the exhaust control valve fail in the open position, the fail-safe valve will actuate to insure that the helmet pressure does not decrease to a dangerous level. Valve actuation is a function of diver orientation so as to maintain helmet pressure within a range to minimize diver breathing effort, for the various positional orientations.
The helmet includes ducting for the exhaust gas and the valves are constructed and arranged to sense the helmet pressure directly for comparison with the ambient water pressure acting on the respective valves.

REFERENCES:
patent: 3370585 (1968-02-01), O'Neill
patent: 3402711 (1968-09-01), Emerson
patent: 3465752 (1969-09-01), Brychta et al.
patent: 3508542 (1970-04-01), Browner
patent: 3509899 (1970-05-01), Hewson
patent: 3526239 (1970-09-01), Oroza
patent: 3802427 (1974-04-01), Banjavich et al.
patent: 3841348 (1974-10-01), O'Neill
patent: 3859994 (1975-01-01), Almqvist et al.
patent: 3877425 (1975-04-01), O'Neill
patent: 3881480 (1975-05-01), Lafourcade

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