Title: Vacuum cleaner

Abstract: A vacuum cleaner comprising a first whirl chamber for receiving dust-laden air and separating heavy and light dust particles therefrom, a second whirl chamber communicating at its inlet end with said first whirl chamber for receiving air therefrom and concentrating very light dust particles in said air, an intermediate chamber arranged at the outlet end of the second whirl chamber for receiving the very light dust particle-containing air therefrom, and a separate air-passage connection between the intermediate chamber and the first whirl chamber for return of said very light dust particle-containing air thereto.

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Inventors: van der Molen, Jacobus H. (Groningen, NL)

Application Number: 854780
Filing Date: 1977-11-25
Publication_date: 1979-10-30
Assignee: U.S. Philips Corporation (New York, NY)
Primary Class(es): 55/340 15/353, 55/337, 55/339, 55/403, 55/409, 55/470, 55/DIG3
Other Classes:
US Patent Ref:

2188031	Jan, 1940	Brock	55/403.
2372514	Mar, 1945	Pootjes	209/144.
2498832	Feb, 1950	Watson et al.	209/144.
3174264	Mar, 1965	McKnab	55/401.
3234716	Feb, 1966	Sevin et al.	55/401.

Other Refs: 7191291482454

Oct, 1965	CA
Jul, 1971	DE

Primary Examiner: Lacey, David L.
Assistant Examiner:
Attorney: Briody; Thomas A., Streeter; William J., Schneider; Rolf E.