Breathing apparatus

Details Breathing apparatus Breathing apparatus

1990-10-10

1991-10-01

Lewis, Aaron J.

Surgery

Respiratory method or device

Means for supplying respiratory gas under positive pressure

12820513, 12820517, 12820127, A62B 700

Patent

active

050523848

ABSTRACT:
A breathing apparatus has first bellows and second bellows, the first bellows being so designed as to expand by a part of air exhaled by the diver or wearer of the breathing apparatus being supplied thereto through a mouth piece and the second bellows being so designed as to contract as the pressure of a surrounding atmosphere around the breathing apparatus, i.e., the atmospheric pressure under water. When the sum of an expanded amount of the first bellows and a contracted amount of the second means reaches a value which is equal to or larger than a predetermined value, an exhalation discharge valve disposed on a mouth piece is so opened as to discharge the exhaled air into a surrounding atmosphere around the breathing apparatus. This arrangement for the breathing apparatus enables the number of times of re-utilizing the exhaled air as air for inhalation to increase as the pressure of the surrounding atmosphere increases.

REFERENCES:
patent: 3827432 (1974-08-01), Lundgren et al.
patent: 4273120 (1981-06-01), Oswell
patent: 4793340 (1988-12-01), Ottestad
patent: 4879996 (1989-11-01), Harwood, Jr. et al.

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