Woodworking – Process – Timber harvesting or processing
Patent
1983-09-20
1984-11-13
Bray, W. D.
Woodworking
Process
Timber harvesting or processing
37 2R, 144 2N, 144 34E, 144367, A01G 2306
Patent
active
044819897
ABSTRACT:
The apparatus for extracting a tree stump from the ground without the root has a frame including locating means for locating the frame in a predetermined central position on a tree stump. Shearing means oppositely disposed on the frame are pivotable toward each other to cut the tap root of the tree stump in a lateral direction at a predetermined distance below the ground level. The shearing means are pivotable by a first set of hydraulic cylinders and also receive additional movement from a thrust member that moves longitudinally with respect to the frame and engages the shearing members during such longitudinal movement. The thrust member also includes an annular cutter portion for cutting the lateral root of the tree stump substantially simultaneously as the shearing members cut the tap root. In one embodiment of the invention the cutter blades of the shearing members are placed next to each other in substantially continuous line to line contact after total shearing of the tap root of the tree stump. In a further embodiment of the invention the cutter blades each have recesses so that the tree stump is gripped rather than sheared. The latter embodiment permits removal of the tap root portion with the tree stump, while the lateral root portion is cut to remain in the ground.
REFERENCES:
patent: 3739823 (1973-06-01), Bartell
patent: 3989075 (1976-11-01), Coughran, Jr.
patent: 4067369 (1978-01-01), Harmon
patent: 4141398 (1979-02-01), Widegren et al.
Bray W. D.
Reichhold Chemicals Inc.
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