A - Human Necessities – 61 – M
Patent
A - Human Necessities
61
M
240/104, 2/72, 1
A61M 16/00 (2006.01) A42B 3/22 (2006.01) A42B 3/28 (2006.01) A62B 7/00 (2006.01)
Patent
CA 1101755
ABSTRACT OF DISCLOSURE 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 transparent plastic material rectractably and telescopically mounted in the slot and having 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 in 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 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.
296945
Canadian Patents And Development Limited
Hughes James R.
LandOfFree
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