Material or article handling – Vertically swinging load support – Shovel or fork type
Patent
1979-01-29
1981-05-12
Paperner, Leslie J.
Material or article handling
Vertically swinging load support
Shovel or fork type
91422, 414708, B66F 922
Patent
active
042669090
ABSTRACT:
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 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 position or an extreme roll-back position by means of hydraulic cylinders extending between the loader bucket and the boom arms. A first leveling 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.
REFERENCES:
patent: 2462580 (1949-02-01), Watson
patent: 3082746 (1963-03-01), Kerridge
patent: 3593616 (1971-07-01), Fox
patent: 3695474 (1972-10-01), Blakely
patent: 3843004 (1974-10-01), Kambe
patent: 3862697 (1975-01-01), Gill et al.
Langenfeld Joseph W.
Westendorf Neal W.
Paperner Leslie J.
Siemens Terrance L.
Westendorf Manufacturing Co.
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