PRE-FILTER OR SHROUD WITH HELICAL STEPPED WALL
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United States of America Patent
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Issued Date -
May 16, 2013
app pub date -
Nov 10, 2011
filing date -
Nov 10, 2011
priority date (Note) -
Abandoned
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Abstract
A vacuum cleaner includes a body. A suction generator and a dirt collection vessel are both carried on the body. The dirt collection vessel includes an arcuate side wall, a tangentially directed inlet, an axially directed outlet, a dirt collection chamber and a shroud provided between the dirt collection chamber and the axially directed outlet. The shroud includes a filter surface having a plurality of air flow apertures and a helical step extending around the shroud through the filter surface.
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