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- US3794021
(A)
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Bibliographic data: US3794021 (A) ― 1974-02-26
DUAL MODE MIXED GAS BREATHING APPARATUS
| Page bookmark | US3794021 (A) - DUAL MODE MIXED GAS BREATHING APPARATUS | ||||
|---|---|---|---|---|---|
| Inventor(s): | LAMBERTSEN C + (LAMBERTSEN C,US) | ||||
| Applicant(s): | LAMBERTSEN C + (LAMBERTSEN C,US) | ||||
| Classification: |
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| Application number: | USD3794021 19711103 | ||||
| Priority number(s): | US19710195199 19711103 | ||||
Abstract of
US3794021
(A)
|
Breathing apparatus, including provisions for carbon dioxide scrubbing and rebreathing, wherein basic resting oxygen supply is maintained by constant mass flow of an oxygen-containing gas, and oxygen in a ventilating gas in excess of the basic requirement is provided, in each inhalation cycle, by a demand valve actuated by collapse of a flexible gas storage chamber, the expansion of which is limited to normal exhalation volume for a predetermined level of physical exertion and means for dumping the exhalation volume in excess of that amount and sub-assemblies of such apparatus. By utilizing, as the demand supplied gas, a gas leaner in oxygen than that supplied at a constant mass flow rate, the tendency to oxygen toxicity during periods of exertion is reduced. Preferably, the system includes a flow-responsive, fail-safe valve to inactivate the rebreather circuit upon failure of the constant mass flow supply.