B - Operations – Transporting – 60 – H
Patent
B - Operations, Transporting
60
H
45/4, 170/63, 98
B60H 1/14 (2006.01) B05B 1/34 (2006.01) B05B 3/16 (2006.01) B60H 1/00 (2006.01) B60H 1/24 (2006.01)
Patent
CA 1175280
SWEEPING AIR STREAM APPARATUS AND METHOD ABSTRACT In an automobile air flow system, air is forced through an air outlet element or nozzle (13, 21, 24) in a sweeping air stream pattern by an oscillating reed or vane member (42) supported solely at the downstream end (43) for air initiated oscillatory movement in the flow path of the air from the source; a weight (41) is on the free, upstream end of the vane and is of a size such that the rate of oscillation is determined by the spring constant of a spring in the vane member and the weight. The oscillating vane (42) is proportioned with respect to the cross sectional size of the outlet such that at any extreme of its oscillatory movement is does not physically contact any other structural member. In one embodiment the oscillating reed is a flat spring which is rendered clickless or silent by limiting directions or bending of the reed element to an axis transverse to the direction of air flow preferably by a bend (78) in the body of the element. The oscillatory member includes an weight or impinge- ment element secured to the upstream end of the flat spring, the rate of oscillation of the impingement mem- ber being directly related to and substantially deter- mined by the spring constant and the weight of the weight or air impingement element. In a further emboidment of the vane, a pair of spaced apart, elongated coil springs (91, 92) carry a flexible sheet (95:) therebetween and a weight (98A and 98B) on the upstream end. The sweep frequency in a defrost system for a wind- shield is low enough compared to the velocity of the jet so that the wavelength is long compared to the nozzle to windshield distance, This will assure minimal mixing of defrost air with ambient and this maximize the inten- sity of heated air on the windshield.
349839
Bowles Fluidics Corporation
Macrae & Co.
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