Respirator

Details Respirator Respirator

1989-02-17

1990-06-19

Sykes, Angela D.

Surgery

Respiratory method or device

Means for removing substance from respiratory gas

A62B 700

Patent

active

049343610

ABSTRACT:
Breathing equipment, e.g., a half mask-type respirator, is disclosed. A mask is provided with three ports of common dimension in any one of which inhalation or exhalation fittings housing inhalation or exhalation valves may be mounted. Disclosed are chemical and mechanical filtration cartridges usable alternatively or in combination. Disposable chemical filtration cartridges having novel lock and seal structure are disclosed. Bayonet-type couplings for coupling the filter housings to the inhalation respiratory fittings and an audible device to indicate that the filter housings are properly coupled are disclosed. The respirator valve is a thin umbrella-shaped disk valve having a multiplicity of radiating ribs which biases the valve to the closed position. A novel crown strap suspension is also provided.

REFERENCES:
patent: 2505173 (1948-12-01), Conley
patent: 2652828 (1951-03-01), Matheson
patent: 2701030 (1955-02-01), Hazelton
patent: 2744524 (1956-05-01), Whipple
patent: 2744525 (1956-05-01), Whipple
patent: 3307543 (1967-03-01), Silverman
patent: 4179274 (1979-12-01), Moon
patent: 4453544 (1984-06-01), Silverthorn
patent: 4573464 (1986-03-01), Yo
patent: 4592350 (1986-06-01), Maryyanek et al.
patent: 4686976 (1987-08-01), Bakkila
patent: 4688567 (1987-08-01), Kikuchi et al.

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