Fluid reaction surfaces (i.e. – impellers) – Specific blade structure – Irregular – flanged or channel forming blade surface
Patent
1996-02-14
1997-07-08
Look, Edward K.
Fluid reaction surfaces (i.e., impellers)
Specific blade structure
Irregular, flanged or channel forming blade surface
416 5, 416DIG3, F04D 2938
Patent
active
056454031
ABSTRACT:
A ceiling fan is disclosed as including a motor and a plurality of fan blades, each of which is a contoured metal blade. Each fan blade has an enlarged leading edge and an end edge, which have been rolled over to establish a thickness of three-sixteenths of an inch at the forward, or "impact" side. Such thickness meets the recognized industry safety standard for fans used in low height applications, wherein the fan is secured to a ceiling spaced eight feet above the floor, and the fan blades are suspended from a depending shaft at an elevation of seven feet above the floor. Such unique arrangement allows high velocity, contoured metal fan blades to be used in applications formerly reserved for wooden paddle fans with blade thicknesses of at least three-sixteenths of an inch.
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Look Edward K.
Verdier Christopher
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