Adjustable-pitch axial fan wheel

Details Adjustable-pitch axial fan wheel Adjustable-pitch axial fan wheel

1985-06-10

1986-09-09

Powell, Jr., Everette A.

Fluid reaction surfaces (i.e., impellers)

Specific working member mount

Adjustable

416 93R, 416239, 416248, F04D 2936

Patent

active

046106006

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.

REFERENCES:
patent: 1878816 (1932-09-01), Bucklen
patent: 2262695 (1941-11-01), Moeller
patent: 2664961 (1954-01-01), Goede
patent: 3255827 (1966-06-01), Nichols
patent: 3300123 (1967-01-01), Freyholdt et al.
patent: 3323710 (1967-06-01), Daly
patent: 3545884 (1970-12-01), Schroeter et al.
patent: 3957381 (1976-05-01), Schafer
patent: 3993415 (1976-11-01), Hauser
patent: 4169693 (1979-10-01), Brubaker

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