Earth working – Automatic power control – Draft responsive
Patent
1978-10-23
1980-07-08
Johnson, Richard J.
Earth working
Automatic power control
Draft responsive
172809, 280446R, E02F 376
Patent
active
042112826
ABSTRACT:
An adjustable blade stabilizer and controls utilized in an earth-working machine such as a bulldozer. The blade and push arms of the machine form a U-shaped structure which is unable to adjust to substantial lateral loads imposed on the blade. The blade stabilizer of the present invention interconnects the front of the frame and either the rear of the blade or one of the push arms. The lift cylinders for the blade are mounted in trunnion assemblies for pivotal movement about mutually perpendicular axes. One of the lift cylinders has associated therewith controls for actuating the stabilizing cylinder in response to lateral forces imposed on the blade. Movement of the control lift cylinder as a result of lateral movement of the blade is sensed by a position switch mounted in the side wall of the main frame which actuates a selection valve thereby causing fluid pressure to be applied at either the head end or rod end of the stabilizing cylinder to stabilize the blade. A semi-circular position plate connecting the lift cylinder and position switch causes the position switch to be linearly moved in response to pivotal movement of the lift cylinder. The position switch causes the selection valve to be shifted whereby the stabilizing cylinder is extended or retracted to counteract the laterally imposed forces on the blade.
REFERENCES:
patent: 3002300 (1961-10-01), Turbyfill
patent: 3441092 (1969-04-01), Drone
patent: 3734195 (1973-05-01), Cantral
patent: 3897833 (1975-08-01), Frisbee
patent: 3901329 (1975-08-01), Eftefield
patent: 3941195 (1976-03-01), Stedman
J. I. Case Company
Johnson Richard J.
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