Woodworking – Special-work machine – Tree felling
Patent
1975-04-21
1976-11-16
Vlachos, Leonidas
Woodworking
Special-work machine
Tree felling
144 3D, 144309AC, A01G 2308
Patent
active
039917991
ABSTRACT:
Upper and lower parts of an upright structure are horizontally articulated, and the structure pivoted to a power train below the point of articulation. The axes of pivot and articulation are parallel, 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 longitudinally 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 pivoting 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 accomplished 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 movement 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 therebetween for returning the chain saw to its sheath.
REFERENCES:
patent: 3747651 (1973-07-01), Bangert et al.
patent: 3885610 (1975-05-01), Forslund et al.
Bray W. D.
Lake, Jr. James B.
Vlachos Leonidas
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