Patent ID: 6224532
Filing Date: 2001-05-01
Classification: B04B

Abstract:
An apparatus comprising:a centrifuge having a first scraping blade and a second scraping blade rotating around a longitudinal axis;said first blade having a first forward face and a first rear face, each of said faces extending between a first radially inner edge located substantially along a first inner radius from said axis and a first radially outer edge located substantially along a first outer radius from said axis, said faces of said first blade having a first width between said first inner radius and said first outer radius;said second blade having a second forward face and a second rear face, each of said faces extending between a second radially inner edge located substantially along a second inner radius and a second radially outer edge located substantially along a second outer radius, said faces of said second blade having a second width between said second inner radius and said second outer radius; and,wherein said first outer radius and said second inner radius are such that said first and said second blades have at least some radial overlap, and wherein said first inner radius is smaller than said second inner radius and said first outer radius is smaller than said second outer radius.