Apparel – Guard or protector – For wearer's head
Patent
1999-02-05
1999-10-26
Calvert, John J.
Apparel
Guard or protector
For wearer's head
2 10, 2424, A41D 1300, A61F 906
Patent
active
059705140
ABSTRACT:
A face mask includes an arcuate transparent sheet which extends about a central axis, and which has an upper engaging edge portion extending therealong. The upper engaging edge portion has a central positioning hole formed in a middle thereof to define a reference line with the central axis, two elongated first grooves formed respectively at two side ends of the upper engaging edge portion to define a first chord therebetween perpendicular to the reference line, and two elongated second grooves respectively inboard to the first grooves. The second grooves define a second chord therebetween perpendicular to the reference line. Each of the first and second grooves extends along the upper engaging edge portion. Each second groove is longer than each first groove. As such, the face mask can be assembled on different kinds of helmets and the like.
REFERENCES:
patent: 2610323 (1952-09-01), Johnson
patent: 2729820 (1956-01-01), Anderson
patent: 3214767 (1965-11-01), Weber
patent: 3868727 (1975-03-01), Paschall
patent: 4495657 (1985-01-01), Bay
patent: 5365615 (1994-11-01), Piszkin
patent: 5673431 (1997-10-01), Batty
patent: 5699556 (1997-12-01), Chen
patent: 5765223 (1998-06-01), McCausland
Calvert John J.
Patel Tejosh
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