Apparatus and method of felling and bunching trees

Details Apparatus and method of felling and bunching trees Apparatus and method of felling and bunching trees

A - Human Necessities

01

G

144/30

A01G 23/08 (2006.01) A01G 23/091 (2006.01) B66F 9/18 (2006.01)

Patent

CA 1036908

APPARATUS AND METHOD OF FELLING AND BUNCHING TREES Alva Z. Albright, Inventor ABSTRACT OF THE INVENTION Upper and lower parts of an upright structure are horizontally ar- ticulated, and the structure pivoted to a power train below the point of articulation. The axes of pivot and articulation are para- llel, the upright structure being pivotable as a whole and in part past the vertical both forwardly and rearwardly with respect to the power train. The upper part comprises a tree trunk gripper lon gitudinally spaced from and between a pair of trunk stabilizers, and the lower part comprises a stump gripper spaced below a chain saw and sheath which are pivoted to initially engage the forward part of a tree and cut rearwardly, the cut being opened by pivot- ing the upper part rearwardly around the axis of articulation. All relatively movable parts are actuated by hydraulic apparatus mounted on the upright structure and connected to an auxiliary hydraulic power system of the power train. Bunching is accomplish- ed by releasing the stump gripper from the stump of the severed tree, proceeding to a bunching area, pivoting the severed tree to a horizontal position thereover and releasing it from the trunk gripper. An hydraulic metering device triggered by a relative move- ment between the chain saw and its sheath permits a rapid initial engaging swing of both to be slowed to a cutting swing of the saw. The same relative movement tightens a spring connected therebe- tween for returning the chain saw to its sheath. - 1 -

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