Re-breathing apparatus

Details Re-breathing apparatus Re-breathing apparatus

1974-08-21

1976-05-18

Michell, Robert W.

Surgery

Truss

Pad

128191R, 128204, 137 88, A62B 702

Patent

active

039570436

ABSTRACT:
This invention relates to a diver's re-breathing apparatus of a closed circuit type. The gas circuit is provided with a solenoid valve coupled to an oxygen cylinder and arranged to be energised to introduce oxygen into the breathable atmosphere when the oxygen content therein drops below a certain proportion.
The electrical circuit comprises a pair of transducers in the gas circuit, one of which is sensitive to oxygen partial pressure and the other sensitive to total pressure, the outputs of the two transducers being amplified and fed into an analogue divider, the output of the divider being responsive to percentage of oxygen in the breathable atmosphere and being effective to energise the solenoid to thereby maintain the oxygen content of the breathable atmosphere within limits of percentage, rather than within limits of partial pressure.

REFERENCES:
patent: 3556098 (1971-01-01), Kanwisher
patent: 3593735 (1971-07-01), Reiher
patent: 3675649 (1972-07-01), Basham
patent: 3794059 (1974-02-01), Burt, Jr.
patent: 3805590 (1974-04-01), Ringwall et al.

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