The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 14, 1978
Filed:
Nov. 05, 1976
Thomas E Baird, Springfield, IL (US);
Other;
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.