Reversible fan

Details Reversible fan Reversible fan

1977-05-26

1979-02-20

Powell, Jr., Everette A.

Fluid reaction surfaces (i.e., impellers)

Specific working member mount

Adjustable

F04D 2936

Patent

active

041404351

ABSTRACT:
A fan, with reversible blades, having a hub receiving the stem of the blades and an inner retaining ring, which has outwardly extending projections, supported concentric with the hub. A helical spring is received in, and actually extends into, a blind hole in each stem, and the inner end of the spring rests on the retaining ring at the projection urging the blades outward.

REFERENCES:
patent: 1479895 (1924-01-01), Colby
patent: 1509286 (1924-09-01), Colby
patent: 1685323 (1928-09-01), Hansen
patent: 3174553 (1965-03-01), Spears
patent: 3428244 (1969-02-01), Palmer
patent: 3799699 (1974-03-01), Master et al.
patent: 3904314 (1975-09-01), Pedersen

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