Protective breathing mask with compressed air supply for breathi

Details Protective breathing mask with compressed air supply for breathi Protective breathing mask with compressed air supply for breathi

1974-07-01

1976-02-03

Michell, Robert W.

Surgery

Truss

Pad

1281422, 1281467, A62B 700

Patent

active

039358615

ABSTRACT:
A protective breathing mask comprises a face encircling mask body which is connected to a compressed gas line for the supply of compressed gas thereto. The mask includes an encircling rim portion which defines an air seal cavity and it is provided with a passage in the body or separated from the body which is connected to the compressed gas line for supplying gas into the seal cavity. The rim includes an inner lip which engages over the face of the wearer and the gas which is circulated to the cavity escapes between the lip and the face into the mask interior. The gas conduit advantageously includes a lung demand inlet valve which opens into the front or into one side of the mask and which has a by pass passage through a throttle to the seal cavity. The seal cavity is advantageously defined by an outwardly formed annular bead or by an annular tubular member which may for example have openings around its periphery for directing the compressed gas from the cavity into the mask interior.

REFERENCES:
patent: 1288647 (1918-12-01), Miller
patent: 2444393 (1948-06-01), Woo
patent: 2882896 (1959-04-01), Seeler
patent: 3018776 (1962-01-01), Saitta et al.
patent: 3149632 (1964-09-01), Colley
patent: 3167070 (1965-01-01), Silverman
patent: 3343535 (1967-09-01), Lytle et al.
patent: 3348538 (1967-10-01), Benzel
patent: 3680555 (1972-08-01), Warncke
patent: 3833935 (1974-09-01), Ansite et al.

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