Brushing – scrubbing – and general cleaning – Machines – With air blast or suction
Patent
1976-11-05
1978-03-14
Moore, Christopher K.
Brushing, scrubbing, and general cleaning
Machines
With air blast or suction
A47L 534
Patent
active
040782751
ABSTRACT:
An upright-type vacuum sweeper has a motor-driven fan in a housing supported by a pair of front wheels on an axle which is vertically adjustable to vary the nozzle height relatively to a floor surface. A ratchet member having two parallel arcuate sets of teeth constitutes in part a lever for effecting the relative movement. A foot-depressible spring-returnable vertically disposed plunger carries a pawl-type escapement element which reciprocates between the sets of teeth to permit stepwise lowering by gravity of the housing and thus the sweeper nozzle. A foot-depressible ratchet-swinging lever provides one-stroke elevation of the housing. Novelly an adjustable screw is positioned to limit downward movement of the housing to provide a vernier adjustment in the low end of the nozzle-adjustment range to facilitate pushing the sweeper, especially over short-nap floor coverings which have been found to produce bothersome frictional resistance to sweeper movement.
REFERENCES:
patent: 1081340 (1913-12-01), Spangler
patent: 2079293 (1937-01-01), Kirby
patent: 2172911 (1939-09-01), Kirby
Moore Christopher K.
Staubly Ralph F.
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