Earth working – Automatic power control – Land leveller type
Patent
1978-01-20
1979-05-29
Stouffer, Richard T.
Earth working
Automatic power control
Land leveller type
172794, E02F 376
Patent
active
041564669
ABSTRACT:
An apparatus mounting on the main frame of a motorgrader for controlling grading and sloping of road shoulders and previously subgraded surfaces having a resilient suspension system for the moldboard depending from the main frame of the grader which is laterally spaced from the point of application of a control load by a universally-connected, double-acting hydraulic jack attached thereto; said moldboard being lifted against said resilient support relative to the main frame of the grader for grade control by a shoe, wheel or ski, which is mounted adjacent the one end thereof and arranged for sliding along a roadway or other previously graded surface as a horizontal reference, and tilted relative to the main frame for slope control by manipulation of the double-acting hydraulic jack controlled by a feedback controller which measures the error in actual moldboard tilt and compares it to a fixed vertical reference as determined by a pendulous sensor and corrects the same in establishing the desired slope to the road shoulder or subgraded surface relative to the vertical by proper manipulation of the double-acting hydraulic jack.
REFERENCES:
patent: 3022060 (1962-02-01), Cook et al.
patent: 3519770 (1970-07-01), Long et al.
patent: 3552498 (1971-01-01), Stauber
patent: 3786871 (1974-01-01), Long et al.
Grizzly Corporation
Stouffer Richard T.
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