Protective helmets

Details Protective helmets Protective helmets

1992-10-09

1994-02-08

Crowder, Clifford D.

Apparel

Guard or protector

For wearer's head

21713, 12820124, 12820125, A42B 300

Patent

active

052839141

ABSTRACT:
A protective helmet incorporates a visor retractable therewithin, a fan for providing filtered airflow through a duct within the shell to the visor, and ear defenders mounted substantially within the profile of the shell.

REFERENCES:
patent: 3178723 (1965-04-01), Aileo
patent: 3223086 (1965-12-01), Denton
patent: 3239842 (1966-03-01), Marchello
patent: 3310811 (1967-03-01), Lacono
patent: 3736927 (1973-06-01), Misaqi
patent: 3906547 (1975-09-01), Aileo
patent: 3963021 (1976-06-01), Bancroft
patent: 4103359 (1978-08-01), Rieppel et al.
patent: 4133308 (1979-01-01), Lowe et al.
patent: 4136688 (1979-01-01), Gorman
patent: 4227520 (1980-10-01), Lord
patent: 4280491 (1981-07-01), Berg et al.
patent: 4752974 (1988-06-01), Haino
patent: 4852562 (1989-08-01), Howie
G. K. Greenough, "The Dust Helmet", Safety in Mines Research Development, pp. 8-12 (U.K. 1974).

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