1978-09-18
1980-06-10
Yuen, Henry C.
98 60, 98 66R, 98 83, F23L 1702
Patent
active
042066930
ABSTRACT:
A chimney cowl has a vertically-spaced series of five annular vanes centered on a common vertical axis. The vanes are carried by three supports equi-spaced around the inner peripheries of the vanes, the supports mounting co-axially with said vanes and between the uppermost vane and the vane immediately subjacent thereto a device providing upper and lower aerofoils. The uppermost and lowermost vanes are parallel and are of frusto-conical shape and the three intermediate vanes are parallel and are normal to the vertical axis of the vanes. The upper aerofoil is a wall of conical shape parallel to the uppermost vane and the lower aerofoil is a wall of inverted conical shape seating within and secured to the wall of the upper aerofoil. Means for clamping the cowl in position in a chimney outlet is provided.
REFERENCES:
patent: 211872 (1879-02-01), Van Noorden
patent: 238185 (1881-02-01), Van Noorden
patent: 564368 (1896-07-01), Esperson
patent: 1097487 (1914-05-01), Van Auken
patent: 1097487 (1914-05-01), Van Auken
patent: 1283374 (1918-10-01), Vaughn et al.
patent: 2742846 (1956-04-01), Alward
patent: 2922354 (1960-01-01), Breidert
patent: 2933036 (1960-04-01), Breidert
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