Protective breathing device having a filtering apparatus and add

Details Protective breathing device having a filtering apparatus and add Protective breathing device having a filtering apparatus and add

1975-09-24

1977-04-26

Fisher, J. Reed

Surgery

Truss

Pad

1281426, A62B 708, A62B 710, A61M 1600

Patent

active

040195074

ABSTRACT:
A protective breathing device comprises a housing having a filter therein and with an inlet air passage through the filter and through an internal passage in the housing to a breathing tube having a mouthpiece which is adapted to be fitted to the wearer. The breathing tube includes an exhaling valve for expelling air which is exhaled through the breathing tube. The housing carries an oxygen cartridge which is fired or opened by a firing pin which penetrates the cartridge in order to supply oxygen into the housing passage for flow through the breathing tube when this is necessary. In addition, the housing has an annular chamber surrounding the inhalation duct carrying an economy bag through which portions of the exhaled air may be recirculated for flow back into the breathing tube on a successive respiration in order to maintain the oxygen content within acceptable limits.

REFERENCES:
patent: 1532654 (1925-04-01), Drager
patent: 2324716 (1943-07-01), Nohl
patent: 2348074 (1944-05-01), Lambertsen
patent: 2695022 (1954-11-01), Hamilton et al.
patent: 3202150 (1965-08-01), Miller
patent: 3390676 (1968-07-01), Warncke et al.
patent: 3397693 (1968-08-01), Warncke
patent: 3607122 (1971-09-01), Hwoschinsky
patent: 3655346 (1972-04-01), Cotabish
patent: 3942524 (1976-03-01), Yi-Sheng

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