Handling: hand and hoist-line implements – Grapple – Well type
Patent
1980-05-01
1982-02-16
Marbert, James B.
Handling: hand and hoist-line implements
Grapple
Well type
294112, 414739, 414569, B66C 110
Patent
active
043156525
ABSTRACT:
A grapple skidder vehicle has a grapple assembly rotatably and pivotally mounted with respect to an outer boom point end portion of a boom extending from the vehicle. The grapple assembly is supported from a cylindrical rotator shaft which is mounted for rotation in a bushed bearing which extends integrally upwardly from a base plate which forms a part of the boom point portion of the boom. The vertical thrust of the weight and load on the grapple assembly is transmitted through the rotator shaft to a rotator shaft operator arm concentric with and encircling the bushed bearing and to a relatively soft wear plate situated between the base plate and a bottom disc-shape base portion of the rotator shaft operator arm. The grapple assembly is pivoted with respect to the boom by a linear hydraulic motor pivotally connected between an outer end portion of the rotator shaft operator arm and the boom. Valve controls for the linear hydraulic motor can selectively: (1) cause the grapple assembly to rotate in a clockwise direction; (2) cause the grapple assembly to rotate in a counterclockwise direction, or (3) allow the grapple assembly to be free of any hydraulic motor control while unloading the source of hydraulic fluid under pressure back to a hydraulic reservoir supplying the source.
REFERENCES:
patent: 3746193 (1973-07-01), Eaves
patent: 3841507 (1974-10-01), Barwise
patent: 4217076 (1980-08-01), Robnett et al.
Marbert James B.
Robil Company
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