Device for replacing the filter of a gas mask in a polluted atmo

Details Device for replacing the filter of a gas mask in a polluted atmo Device for replacing the filter of a gas mask in a polluted atmo

1988-10-06

1990-06-12

Burr, Edgar S.

Surgery

Respiratory method or device

Means for quickly connecting or disconnecting apparatus...

12820524, 12820617, A62B 904

Patent

active

049323997

ABSTRACT:
A device is provided for preventing the inflow of air into a gas mask during the substitution of its filter in the presence of a contaminated atmosphere. The device includes a small plate having a central stem which passes through the support for a check valve admitting air to the respiratory tract of the user and a spring which pushes the small plate against the diaphragm of the check valve when the filter is removed from the mask to prevent inflow of air into the mask.

REFERENCES:
patent: 3072119 (1963-01-01), Matheson
patent: 3308815 (1967-03-01), Wilcox et al.
patent: 3474783 (1969-10-01), Ulmann
patent: 3704002 (1972-11-01), Skarzynski
patent: 3858910 (1975-01-01), Oetiker
patent: 4433684 (1984-02-01), Sarnoff et al.
patent: 4453544 (1984-06-01), Silverthorn
patent: 4559939 (1985-12-01), Levine et al.
patent: 4793342 (1988-12-01), Haber et al.
patent: 4831664 (1989-05-01), Suda
patent: 4844409 (1989-07-01), Lackler et al.

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