Quiet and efficient motor cooling fan assembly for a blender

  • US 5,273,358 A
  • Filed: 04/13/1992
  • Issued: 12/28/1993
  • Est. Priority Date: 04/13/1992
  • Status: Expired due to Term
First Claim
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1. A blender comprising a pitcher having a mixing blade therein;

  • a motor to operate said mixing blade;

    first housing means supporting said pitcher and providing a chamber for said motor, said first housing means having air intake apertures therein;

    a radial flow cooling fan driven by said motor and having a plurality of radial vanes;

    second housing means below said first housing means and providing a chamber for said fan, said second housing means having an air exit aperture therein; and

    means positioned in said second housing means between said fan and said air exit aperture to muffle the noise generated by air moved by said fan, said means to muffle including a plate positioned below said fan, and rib means extending radially outwardly from said plate and dividing said second housing means into a plurality of chambers, the number of said radial vanes of said fan not being evenly divisible by the number of said plurality of chambers;

    said fan drawing air into said first housing means through said air intake apertures, around said motor to cool the same, through said second housing means and through said means to muffle so that the air is divided in said chambers and recombined as it passes out through said air exit aperture thereby reducing the noise generated by the moving air.

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