Earth working – Overload shifting – Against spring return device
Patent
1980-06-27
1982-07-06
Stouffer, Richard T.
Earth working
Overload shifting
Against spring return device
60584, 172282, 172316, 172780, 172794, 180132, A01B 6104, A01B 6908, E02F 376
Patent
active
043378323
ABSTRACT:
A land plane for leveling or grading the surface of a land area. The plane includes a frame defined by a center section and end sections pivotally connected to the center section, with each connection permitting relative physical movement about an axis transverse to the longitudinal axis of the plane. A first hydraulic system is provided for pivoting the end sections about their transverse axes for raising and lowering the center section with respect to ground level, wherein the system includes a device for equalizing fluid between hydraulic cylinders carried by the end sections to permit adjustment of the grader assembly with respect to ground level under different operating conditions. A second hydraulic system is provided to permit selective steering of the rear wheels in response to the front wheels through either pivotal movement of a tongue connecting the plane to a tow vehicle or from a separate hydraulic power source carried by the tow vehicle, wherein the system includes means for purging itself of entrapped air. A biasing mechanism is provided for the grader assembly to permit tripping of the blades when the applied force encountered during grading exceeds the predetermined bias force. The mechanism is capable of imparting a bias force which requires a greater degree of applied force to initiate tripping of the blade than that which is required for continued tripping of the blade.
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