Brushing – scrubbing – and general cleaning – Machines – With air blast or suction
Patent
1983-10-05
1987-07-28
Coe, Philip R.
Brushing, scrubbing, and general cleaning
Machines
With air blast or suction
15347, A47L 524
Patent
active
046823840
ABSTRACT:
The vacuum generating system for a hand-held vacuum cleaner comprises a fan or impeller having backwardly curved arcuate blades extending between preferably frusto-conical wall portions of front and rear fan shrouds. The front fan shroud is associated with the fan housing to provide a slip seal against vacuum loss around the sides of the fan. The centers of curvature of the arcuate blades are parallel to the central axis of the fan. Although the air flow passages defined by the blades and front and rear shrouds are of complex shapes, the fan may be manufactured economically. The air watts performance curve of the fan is desirably blunted or flattened without significant reduction of altitude or maximum height as compared to prior cleaners.
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Fluid Flow, 2d ed., Rolf H. Sabersky, Allan J. Acosta & Edward G. Hauptmann, McMillan, pp. 428, 429.
Kochte Werner W.
Prahl Joseph M.
Coe Philip R.
Stinson Frankie L.
The Scott & Fetzer Company
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