Grader blade having a pressurized float position

Details Grader blade having a pressurized float position Grader blade having a pressurized float position

1988-10-28

1989-08-01

Johnson, Richard J.

Earth working

Scraper between front and rear ground supports of vehicle

Specific actuator between frame and scraper

91531, 60494, E02F 385, E01H 600

Patent

active

048526606

ABSTRACT:
A grader has a grader blade which can be pressed against the ground or lifted off it by means of piston-cylinder drives. To be able to vary the downard pressure of the grader blade in its float position, either the piston chamber or the piston ring chamber of each drive can be charged with a working fluid under pressure when the grader blade is in the float position, so that the corresponding drive exerts a force on the grader blade which increases or decreases the downward pressure of the grader blade on the ground. While still allowing the grader blue to follow the contour of the ground.

REFERENCES:
patent: 2949097 (1960-08-01), Kaay
patent: 3709103 (1973-01-01), Dukhovny et al.
patent: 3872670 (1975-03-01), Dezelan et al.
patent: 3908515 (1975-09-01), Johnson
patent: 4024796 (1977-05-01), Theobald
patent: 4034815 (1977-07-01), Dezelan
patent: 4341149 (1982-07-01), Dezelan
patent: 4372193 (1983-02-01), Hall
patent: 4651624 (1987-03-01), Beck

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