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Vacuum cleaner

  • US 8,881,342 B2
  • Filed: 01/25/2008
  • Issued: 11/11/2014
  • Est. Priority Date: 01/26/2007
  • Status: Active Grant
First Claim
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1. A vacuum cleaner comprising:

  • a main separating unit;

    a porous filter;

    an auxiliary separating unit having a higher airflow resistance than the porous filter and a higher airflow resistance that the main separating unit, and wherein the auxiliary separating unit comprises a cyclone separator,a vacuum source adapted to generate an airstream; and

    airflow passages configured to operate in a vacuum cleaning mode and a filter cleaning mode, wherein;

    in the vacuum cleaning mode, the airflow passages are configured to direct the airstream through the main separating unit and then through the filter in a first direction, and the airflow substantially bypasses the auxiliary separating unit, andin the filter cleaning mode, the airflow passages are configured to direct the airstream through the filter in a second direction, opposite the first direction, and then through the auxiliary separating unit.

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