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Fan device

  • US 4,846,399 A
  • Filed: 10/03/1988
  • Issued: 07/11/1989
  • Est. Priority Date: 10/03/1988
  • Status: Expired due to Term
First Claim
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1. A fan device usable for increasing the flow of air through a register, comprising a housing containing both a fan impeller and an electric motor for driving the impeller, said housing having a skirt surrounding an air inlet and having edges capable of at least partially sealing a space around said register, the impeller being arranged to direct air generally upwardly through a top outlet in the casing when the device is resting on said skirt;

  • said housing having a peripheral wall and a top wall joined to said peripheral wall, said top outlet being provided by a generally central aperture in said top wall overlying the impeller, said peripheral wall including two sidewalls joined by endwalls, central portions at least of said sidewalls being generally flat;

    the spaces between said sidewalls and said impeller being free of any ducts or vane means so that air can move freely across said spaces;

    wherein said outlet aperture is defined in part by side edges extending between the central portions of the sidewalls, said edges lying outside a circular area which corresponds to the perpendicular projection of the impeller circumference on the top wall, said side edges being curved around said circular area but deviating from the circular area sufficiently to provide discrete enlargements of said aperture lying outside said circular area and adjacent the sidewalls;

    wherein said fan impeller has blades which increase in width with increasing radius, the blades having tips which are sufficiently close to the aperture that air expelled from the corners of the impeller tips closest to the aperture in a largely radial direction at 35°

    to the impeller plane passes substantially entirely outwardly through the aperture.

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