Brushing – scrubbing – and general cleaning – Machines – With air blast or suction
Patent
1976-09-01
1978-04-11
Moore, Christopher K.
Brushing, scrubbing, and general cleaning
Machines
With air blast or suction
A47L 534
Patent
active
040830799
ABSTRACT:
An upright vacuum cleaner having a suction nozzle at the front of the bottom of the chassis is provided with a nozzle height adjusting mechanism for varying the elevation of the rear wheels relative to the chassis to provide a multiplicity of nozzle height positions. The rear axle is journaled on the chassis and includes a pair of off-set legs on which a respective rear wheel is mounted. A wheel bracket is journaled on one end of one off-set crank leg and supports a guide member and a helical end cam track. A follower member having a conjugate helical surface rides on the cam track and supports a locking member on its upper surface. The locking member is secured to the chassis and includes a plurality of detent teeth between each two of which at least one tooth on the follower member is received to lock the follower in a selected position. Turning of the knob allows the follower tooth to slide over the detent teeth to allow rotation of the follower which effects a vertical movement thereof on the cam track surface.
REFERENCES:
patent: 1837315 (1931-12-01), Becker
patent: 1921033 (1933-08-01), Kitto
patent: 2048518 (1936-07-01), Ray
patent: 2107016 (1938-02-01), Snyder
Bell Edward L.
Moore Christopher K.
Ruderman Alan
Smith Robert E.
The Singer Company
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