Woodworking – Special-work machine – Tree felling
Patent
1976-05-03
1978-01-24
Hinson, Harrison L.
Woodworking
Special-work machine
Tree felling
144 3D, A01G 2308
Patent
active
040698483
ABSTRACT:
This invention relates to an improved shearing device to be mounted on a tree harvesting vehicle having a pair of blade edges which move through inward downward directed arcs in shearing the tree. This movement provides the advantage of reducing cracking or splitting of the butt end of the cut log and additionally shatters the stump below the cut which exposes more of it to more rapid breakdown by the elements following cutting. In one embodiment, the frame of the tree shearing device mounted on the end of a boom mechanism on the vehicle has a U-shaped horizontal portion with spaced apart arms which define a front opening to receive the tree trunk therethrough. A pair of blade members, one of each of which is pivotally mounted on each of the arms, are pivoted inwardly and downwardly from the open to the closed position by a hydraulic cylinder connected to them adjacent their rear ends. A pin and slot connection between the two blade members ensure that they rotate concurrently. In a second embodiment, the lower portion of the frame is inclined forwardly downwardly and the spaced blade members are pivotally mounted on it. The blade edges of the blade members project forwardly and upwardly of this lower portion of the frame to receive the tree therebetween and the hydraulic cylinder is connected to the blade members adjacent their rear ends to drive them between the open and closed positions. This embodiment has the advantage over the first embodiment that it enables the tree to be cut closer to the ground, thereby reducing the height of the stump and accordingly the wastage.
REFERENCES:
patent: 3540501 (1970-11-01), Jonsson
patent: 3865160 (1975-02-01), McColl
patent: 3888287 (1975-06-01), Johnson
patent: 3920057 (1975-11-01), Hamilton
Bray W. D.
Hinson Harrison L.
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