Precision grader

Details Precision grader Precision grader

1977-08-08

1978-09-12

Byers, Nile C.

Road structure, process, or apparatus

Apparatus

With in situ means for both comminuting and treating, e.g.,...

299 41, E01C 2312

Patent

active

041134028

ABSTRACT:
A plurality of rotary cutters for pulverizing soil for a subgrade, a conveyor for moving soil from the subgrade, and a leveling blade are connected successively on a slowly moving machine to prepare in a single pass a subgrade for concrete. Blades on the rotary cutter are revolved horizontally and are set at different levels to slice the soil evenly from the bottom of the subgrade and to pulverize the soil. The conveyor may be either a screw or a chain type, and a portion of the conveyor extends across the subgrade behind the rotary cutters. The leveling blade leaves a desired amount of leveled, pulverized soil, and when a screw conveyor is used, pushes the soil into the conveyor.

REFERENCES:
patent: 1225547 (1917-05-01), Willson
patent: 1812771 (1931-06-01), Blood
patent: 2093766 (1937-09-01), Rich
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patent: 3148917 (1964-09-01), Thompson
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patent: 3472555 (1969-10-01), Theermann
patent: 3606468 (1971-09-01), Walker
patent: 3779661 (1973-12-01), Godbersen
patent: 3843274 (1974-10-01), Gutman
patent: 3893780 (1975-07-01), Gutman

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