Grapple skidder with self-centering grapple support mechanism

Details Grapple skidder with self-centering grapple support mechanism Grapple skidder with self-centering grapple support mechanism

1972-03-31

1976-03-30

Spar, Robert J.

Traversing hoists

Overhead

Cable

212 7, 294106, B66C 132

Patent

active

039468828

ABSTRACT:
A material handling vehicle, especially a log skidder, having articulated front and rear sections and a boom mounted on the rear section which pivotally supports a material handling member such as a grapple adapted to seize the ends of logs to be moved by the skidder. The grapple hangs from the end of the boom on a selfcentering mechanism which includes a plurality of first circular discs, a plurality of second circular discs interleaved therewith with the uppermost disc being fixed and interacting between discs, a plurality of spring elements which resist rotation of the grapple in either direction about the grapple turning axis tending to return it to a normally centered position relative to the centerline of the vehicle without operator assistance.

REFERENCES:
patent: 3204795 (1965-09-01), Larson
patent: 3363929 (1968-01-01), Nelson
patent: 3477596 (1969-11-01), Michaelson
patent: 3620394 (1971-11-01), Symons

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