Fan blade set for cooling fan

Fluid reaction surfaces (i.e. – impellers) – Diverse impellers or working members

Reexamination Certificate

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C416S19800R

Reexamination Certificate

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11019344

ABSTRACT:
A fan blade set (10) for a cooling fan includes a hub (12) having a first wall and a second wall extending from the first wall. First blades (14) extend radially from the second wall. Second blades (16) formed on the first wall extend from a central portion of the first wall to a border thereof. Each second blade has a twisted shape such that an angle formed between the surface of the second blade and the first wall varies continuously along the extending direction of the second blade.

REFERENCES:
patent: 3885888 (1975-05-01), Warhol
patent: 426263 (1980-04-01), Goff
patent: 6065936 (2000-05-01), Shingai et al.
patent: 6948912 (2005-09-01), Chang et al.
patent: 2002/0122724 (2002-09-01), Tseng

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