Adjustable-pitch axial fan wheel
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United States of America Patent
Stats
-
Sep 9, 1986
Grant Date -
N/A
app pub date -
Jun 10, 1985
filing date -
Jun 10, 1985
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An adjustable-pitch axial fan wheel. A hub has an outer surface forming a portion of a sphere. A plurality of blades are attached to the hub, each blade having a substantial flange at the base portion, the inner surface of the flange being spherical to match the surface of the hub. A central strengthening bolt extends through the blade and projects into the hub to form a pivot axis for the blade. Arcuate holes are formed in the flange, the arcuate holes being alignable with bolt holes in the hub to bolt the flange to the hub while permitting blade pitch adjustment within about 28.degree. of rotation of each blade with respect to the hub.
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