Patent ID: 6484350
Filing Date: 2002-11-26
Classification: A47L

Abstract:
A canister vacuum cleaner comprising:(a) a chassis having a housing unit, the housing unit having an air inlet and roller means for moving the chassis; (b) an air blower disposed within the housing unit; (c) a dust extraction and collection unit disposed within the housing unit, the dust extraction and collection unit comprising: (i) an enclosed inlet chamber, the inlet chamber being substantially cylindrical in shape with an internal diameter between about 130 mm and about 200 mm, the inlet chamber comprising a bottom wall, at least one generally vertical sidewall, an upper section, and a lower section, the sidewall having an interior height between about 200 mm and about 250 mm, the upper section of the inlet chamber having an air inlet opening through the sidewall; and (ii) an enclosed outlet chamber disposed concentrically within the upper section of the inlet chamber, the outlet chamber having a bottom wall, a top wall and at least one generally vertical sidewall, the bottom wall of the outlet chamber being disposed spaced apart from the bottom wall of the inlet chamber, the top wall having a top wall opening, the sidewall having an interior height between about 50 mm and about 100 mm, the sidewall also having between about 1000 and about 1500 inlet apertures, each inlet aperture defining an area between about 3 mm2 and about 30 mm2, the inlet apertures being disposed in a band around the sidewall of the outlet chamber, the band having a width between about 20 mm and about 50 mm and a median line disposed between about 30 mm and about 100 mm above the bottom wall, the outlet chamber further having an upper section, a lower section and a circular exterior perimeter edge member disposed around the sidewall in the lower section of the outlet chamber, the exterior edge member having a diameter between about 10 mm and about 60 mm less than the internal diameter of the inlet chamber; and (d) duct work for serially connecting in fluid communication the air inlet in the housing unit, the inlet chamber, the outlet chamber and the air blower.