Electric fan with detachable blades

Details Electric fan with detachable blades Electric fan with detachable blades

2006-10-17

2006-10-17

Look, Edward K. (Department: 3745)

Fluid reaction surfaces (i.e., impellers)

Specific working member mount

Distally supported on radial arm

C416S21900R, C416S22000A, C416S234000

Reexamination Certificate

active

07121805

ABSTRACT:
An electric fan comprises a rotary hub comprising a hollow two-layer cylinder including a plurality of units each including: a gap between the layers, an axial first coupling edge abutted on an adjacent unit, an arcuate second coupling edge at its inner end joined with the first coupling edge, two internal ridges, and a rib interconnected the cylinder and a central sleeve; and a plurality of detachable blades comprising a blade section and a base including a raised member, a connecting edge in a joining portion of the blade section and the raised member, two side shoulders, and a forward, downward projection. Each base is inserted into the gap with the shoulders engaged with the ridges, the connecting edge engaged with the second coupling edge, and one side of the raised member engaged with the first coupling edge respectively. Also, each projection is threadedly secured to each rib.

REFERENCES:
patent: 752670 (1904-02-01), Hamilton
patent: 4060338 (1977-11-01), Macauley
patent: 5354177 (1994-10-01), Chang
patent: 5476366 (1995-12-01), Weihsmann
patent: 5573376 (1996-11-01), Hayden et al.
patent: 2004/0052641 (2004-03-01), Chen

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