B - Operations – Transporting – 66 – F
Patent
B - Operations, Transporting
66
F
214/38, 138/84,
B66F 9/22 (2006.01) A01D 87/00 (2006.01) E02F 3/43 (2006.01)
Patent
CA 1140424
ABSTRACT OF THE DISCLOSURE An apparatus for hydraulic self-leveling of a loader bucket or the like is described wherein the loader upon which the bucket is mounted comprises a pair of spaced-apart boom arms pivotally mounted on a sub-frame attached to the tractor. The boom arms are pivotally moved relative to the tractor by means of hydraulic cylinders connected thereto. The loader bucket is pivotally connected to the forward ends of the boom arms and may be pivotally moved from a level position to an extreme dump posi- tion or an extreme roll-back position by means of hydraulic cylinders extending between the loader bucket and the boom arms. A first leveling cylinder or actuator cylinder is connected to one of the boom arms and one of the sub-frame towers so that upward movement of the boom arms causes the cylinder rod of the actuator cylinder to be extended therefrom and so that downward movement of the boom arms causes the cylinder rod of the actuator cylinder to be moved inwardly into the cylinder. Extension of the cylinder rod from the actuator cylinder forces fluid from the actuator cylinder to be supplied to the extension side of the bucket cylinders so that the bucket is maintained in a level position as the boom arms are being raised. Conversely, retraction of the cylinder rod into the actuator cylinder as the boom arms are being pivotally moved downwardly causes hydraulic fluid from the actuator cylinder to be supplied to the retraction side of the bucket cylinders to maintain the bucket in a level position as the boom arms are being lowered. The actuator cylinder includes a pressure relief valve assembly in the piston thereof to permit hydraulic fluid to flow from one compartment portion to another upon the pressure in that particular compartment portion reaching a predetermined level. A second leveling cylinder or actuator cylinder may be mounted on the other boom arm and tower if so desired.
323164
Langenfeld Joseph W.
Westendorf Neal W.
Shearn G. James M.
Westendorf Manufacturing Co.
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