Negative pressure full face respirator having a replaceable view

Details Negative pressure full face respirator having a replaceable view Negative pressure full face respirator having a replaceable view

1989-11-20

1991-02-05

Burr, Edgar S.

Surgery

Respiratory method or device

Face mask covering a breathing passage

2 8, A62B 1808

Patent

active

049895982

ABSTRACT:
A full face negative pressure respirator having a replaceable viewing window is described. The respirator is especially useful as a welder's negative pressure full face respirator where the viewing window is subject to chipping and/or scratching that can impair the vision of the wearer. The full face negative pressure respirator of the present invention utilizes a viewing window insert assembly that comprises an integrally molded curved insert wall and viewing window chamber that accommodates easy replacement of an optically damaged viewing window while providing a gas tight seal between the viewing window and the insert assembly which is not subject to failure by an increase in negative pressure within the facial cavity of the respirator during normal use conditions.

REFERENCES:
patent: 2631285 (1953-03-01), Maillart
patent: 3220408 (1965-11-01), Silverberg
patent: 3278943 (1966-10-01), Manz
patent: 3315673 (1967-04-01), Morton

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