Patent ID: 7922794
Filing Date: 2011-04-12
Classification: A47L,B04C,Y10S

Abstract:
1. A cyclone separator for a vacuum cleaner, the cyclone separator comprising: a cyclone chamber having an air inlet and an air outlet, the cyclone chamber being adapted to direct an airflow into a cyclonic pattern to remove a first amount of debris from the airflow; a filter shroud located within the cyclone chamber and separating the air inlet from the air outlet, the filter shroud comprising an air-pervious filter surface adapted to allow the airflow to pass from the air inlet to the air outlet and remove a second amount of debris from the airflow; and one or more protrusions associated with the filter surface, the one or more protrusions being configured and dimensioned to direct at least a portion of the airflow passing generally parallel to the filter surface away from the filter surface before passing through the filter surface; wherein the filter surface is generally cylindrical or frustoconical, and the one or more protrusions comprise a plurality of ribs extending in a generally helical pattern around the filter surface, the ribs being oriented generally perpendicular to the portion of the airflow passing generally parallel to the filter surface.