Title: Air cushion mowers

Abstract: A lawnmower comprises a generally dome-shaped plenum chamber for supporting a motor or engine, a cutter and an air-impeller mounted for rotation within the said chamber, an air intake positioned centrally in the roof of said chamber above said impeller such that, in use, the impeller produces a cushion of air in the chamber bounded by a vortiginous air curtain, a peripheral flange extending outwardly from the bottom edge of said chamber in a direction substantially parallel to the ground, and means associated with said flange for partially trapping the turbulent air escaping from the said chamber beneath said flange whereby the rate of air loss from the said cushion is substantially reduced.

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Inventors: Dawson, Frank (Littleover, GB)

Application Number: 929663
Filing Date: 1978-07-31
Publication_date: 1980-05-27
Assignee: Qualcast (Lawn Mowers) Limited (Sunnyhill, GB2)
Primary Class(es): 56/320.1 56/DIG3, D15/17
Other Classes:
US Patent Ref:

3110996	Nov, 1963	Dalhman	56/12.
3338038	Aug, 1967	Camph	56/12.
3550718	Dec, 1970	Knuth	180/116.
3838558	Oct, 1974	Goodchild	56/DIG.
3877206	Apr, 1975	Cody et al.	56/DIG.
3912038	Oct, 1975	Bernaerts	180/116.

Other Refs: 129834623377211448539

Jun, 1969	DE
Feb, 1975	DE
Sep, 1976	GB

Primary Examiner: Mancene, Louis G.
Assistant Examiner: Hirsch, Paul J.
Attorney: