Fluid reaction surfaces (i.e. – impellers) – Specific drive or transmission means – Hand mixers
Reexamination Certificate
1999-09-09
2001-02-06
Lopez, F. Daniel (Department: 3745)
Fluid reaction surfaces (i.e., impellers)
Specific drive or transmission means
Hand mixers
C416S062000
Reexamination Certificate
active
06183201
ABSTRACT:
This invention pertains to fans.
More particularly, the invention pertains to a method and apparatus for reducing the risk that dust and other allergenic contaminants will accumulate on the leading edge of the blade of a ceiling fan.
In a further respect, the invention pertains to a method and apparatus for reducing the risk of harm to an individual struck by the leading edge of a ceiling fan.
The blade of a conventional ceiling fan has, as is depicted in
FIG. 1
, a squared-off leading edge. Movement of this edge through the air produces turbulent air flow
50
which promotes the accumulation of dust and other contaminants on the upper
51
and lower
52
surfaces adjacent the face
53
of the blade. In fact, over time surfaces
51
and
52
often become black as a result of the build up of dust, pollen, and other particles. When a ceiling fan is turned on and the blades begin to rotate, some of these particles escape into the air and are inhaled by inhabitants of the building in which the ceiling fan is mounted. In addition, pollen and other particles are believed to provide a food source for airborne bacteria, fungi, and other microorganisms, causing what appears to be a relatively harmless buildup of dust to function as a breeding ground for harmful disease-causing substances.
Accordingly, it would be highly desirable to provide an improved ceiling fan which would, to reduce the health risk associated with the ceiling fan, significantly reduce the accumulation of dust and other contaminants on the ceiling fan blades during operation of the ceiling fan.
Therefore, it is a principal object of the invention to provide an improved fan.
A further object of the instant invention is to provide an improved ceiling fan which functions to clean automatically and prevent the accumulation of dust and other particulate on top and bottom surfaces of the leading portion of the blades of the ceiling fan.
Another object of the invention is to provide an improved ceiling fan of the type described which includes blades each having a substantially rigid portion and a resilient leading edge which apportions air flow unequally between the top and bottom surfaces of the blade.
A further object of the invention is to provide an improved ceiling fan of the type described which includes blades each having a leading edge which flexes and alters shape during operation of the ceiling fan.
REFERENCES:
patent: 4738594 (1988-04-01), Sato et al.
Butler, III George
Lopez F. Daniel
McAleenan James M.
Nissle P.C. Tod R.
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