E - Fixed Constructions – 21 – F
Patent
E - Fixed Constructions
21
F
E21F 1/00 (2006.01) F04D 25/16 (2006.01)
Patent
CA 2303589
An air ventilation device for bringing fresh air into mine drifts from ground level. The air ventilation device has a pair of air circulation units disposed side by side, each air circulation unit having a power rotor, a rotor casing partly enclosing the rotor, and a plurality of blades rotatably carried by the power rotor radially thereof. A single fan casing surrounds both air circulation units and is integral to the rotor casings. The fan casing is of cross-sectionally oblong shape widthwisely , to increase ground clearance in the mine shaft while maintaining suitable air flowthrough capabilities.
Knight Claude R.
Knight Ronald J.
Nieminen Robert E.
Knight Claude R.
Knight Ronald J.
Lesperance & Martineau
Nieminen Robert E.
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