A - Human Necessities – 62 – B
Patent
A - Human Necessities
62
B
A62B 18/04 (2006.01) A42B 3/22 (2006.01) A42B 3/28 (2006.01)
Patent
CA 2141336
2141336 9403235 PCTABScor01 Respirator apparatus (10) comprises a monocoque helmet (11), with a visor (14), which is pivotal between an inoperative raised position and an operative lowered position. The helmet (11) is formed of outer shells (17, 18) joined together along the rim and at strategic locations within the domed area of the helmet but are selectively spaced apart in various regions to provide an air chamber (19), at the rear of the helmet (11) and an air chamber (20) at the forward part of the helmet. These chambers (19, 20) are interconnected by three ducts (21, 22, 23). The chamber (19), opens through the outer shell and is fitted with an air filter (25), to receive incoming air. The chamber (20) opens through the inner shell (17) and is fitted with a fan (26) to propel air through the ducts (21, 22, 23) into a breathing zone formed behind the visor (14). The rear portion of the helmet is provided with a chamber (29) which is isolated from the ducts (21, 22, 23) and which accommodates batteries for energising the fan (26). The visor (14) may be arranged to activate the fan automatically when it is moved to its lowered position.
Gowling Lafleur Henderson Llp
Mine Safety Appliances Company Limited
LandOfFree
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