Surgery – Respiratory method or device – Including body or head supported means covering user's scalp
Patent
1979-01-08
1980-10-14
Recla, Henry J.
Surgery
Respiratory method or device
Including body or head supported means covering user's scalp
12820125, 21713, 2 6, A62B 1804
Patent
active
042275202
ABSTRACT:
A miner's safety helmet having a lamp mounted on the front thereof comprising inner and outer shells made of tough, hard plastic material having a generally hemispheric shape to conform with the upper part of the wearer's head, the shells being spaced apart, and closed around the rims thereof, to form an enclosed space therebetween, a slot-like opening at the front part of the rim of the helmet into the enclosed space, a visor of tranparent plastic material rectractably and telescopically mounted in the slot and having a doubly curved shape to conform with the shape of the enclosed space such that when the visor is in a fully retracted position it lies almost completely in the enclosed space and when in fully extended position it extends over the face of the wearer, an air supply connection at the rear of the helmet adapted for connection to a source of clean filtered air, switch means mounted in the helmet in the enclosed space in relation to the visor configuration, and electrical leads from the switch to the air source, such that when the visor is in the fully extended position the switch is operative to turn on the air source to provide a flow of air down over the wearer's face inside the visor and when the visor is in a partially or fully retracted position the switch is operative to turn off the air supply.
REFERENCES:
patent: 3258010 (1966-06-01), Austin et al.
patent: 3293659 (1966-12-01), Shepard
patent: 3310811 (1967-03-01), Iacono, Jr.
patent: 3413972 (1968-12-01), Depping
patent: 3649964 (1972-03-01), Schoelz
patent: 3657740 (1972-04-01), Cialone
patent: 3910269 (1975-10-01), Ansite et al.
patent: 3963021 (1976-06-01), Bancroft
Canadian Patents & Development Ltd.
Recla Henry J.
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