Apparel – Guard or protector – For wearer's head
Patent
1987-03-26
1988-06-07
Nerbun, Peter
Apparel
Guard or protector
For wearer's head
A61F 902
Patent
active
047486970
ABSTRACT:
A face mask which is characterized by a soft rubber or plastic cowl provided with a track insert having pair of tracks spanning an open lens window for receiving a transparent lens slidably mounted in the tracks and closing the lens window. In a preferred embodiment, the lens is a tear-away lens connected at a perforated interface to the next one of several additional lenses wound in end-to-end relationship in a roll, which roll is located inside a canister attached to the track insert of the face mask. Each lens is individually, selectively and sequentially extended through a slot in the canister and through the parallel lens tracks to a track lip projecting from the opposite side of the track insert, when the preceding lens is damaged or coated so as to adversely affect visibility and is removed from the lens tracks. When the damaged lens is slidably extended from the lens tracks in the face mask for removal, a second lens is unrolled from the canister and slidably positioned over the lens window and the damaged lens is torn from the leading edge of the newly positioned lens at the perforated interface between the lenses.
REFERENCES:
patent: 2119439 (1938-05-01), Parmelee
patent: 2592805 (1952-04-01), Hutchinson
patent: 2886819 (1959-05-01), Uphoff
patent: 4428081 (1984-01-01), Smith
patent: 4542538 (1985-09-01), Moretti et al.
Harrison John M.
Nerbun Peter
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