Vibratory screed including a spreading device for leveling and d

Details Vibratory screed including a spreading device for leveling and d Vibratory screed including a spreading device for leveling and d

1985-02-22

1987-03-10

Leppink, James A.

Road structure, process, or apparatus

Apparatus

Screed or drag

404120, 404114, E01C 1922, E01C 1930

Patent

active

046487417

ABSTRACT:
A vibratory concrete screed includes a frame and a substantially horizontal screed blade. A pair of end-mounted winches advance the screed along concrete forms into an area of unfinished plastic concrete. A concrete spreading device is translated back and forth along the length of the screed to partially level the unfinished concrete before engagement by the screed blade. The concrete spreading device includes grading means having distributing means in the form of an auger and metering means in the form of a plow. The auger initially levels and redistributes the plastic concrete while the plow receives the plastic concrete from the trailing edge of the auger and regulates the level of plastic concrete discharged from the concrete spreading device and intercepted by the screed blade. A carriage maintains the grading means at a predetermined elevation in front of the screed blade and translates the spreading device along the length of the screed frame. The concrete spreading device operates on the unfinished plastic concrete to feed a partially finished, constant height charge of concrete to the screed blade.

REFERENCES:
patent: 1840970 (1932-01-01), Noble
patent: 2006316 (1935-06-01), Mandt
patent: 2346379 (1944-04-01), Jackson
patent: 2380435 (1945-07-01), Heltzel
patent: 2439620 (1948-04-01), Faber
patent: 2757588 (1956-08-01), Pollitz
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patent: 3540360 (1970-11-01), Snow et al.
patent: 3883259 (1975-05-01), Berg et al.
patent: 4068970 (1978-01-01), Rowe
patent: 4466757 (1984-08-01), Allen

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