Device for use in removal of stumps
AssigneeOstbergs Fabriks AB
InventorErik Torsten Forslund
Life of this patent
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Abstract
At the end of a vehicle-carried crane arm a vertically extending frame is supported which at its lower end carries a movable split head with spreadable chopping blades. A ram raisable to the top of the frame drives, when released, by the impact on the split head the blades into the center of a tree stump that is to be extracted from the earth. Then the blades are spread to break the stump into separate portions which are easily individually removable in a direction substantially following the extension of the roots.
Claims7
A device for use in removal of tree stumps, comprising a vehicle-carried crane arm, a vertically extending frame supported at the end of said crane arm, a split head mounted at the lower end of said frme for limited vertical movement, chopping blades mounted at said split head and movable between a collected and radially spread position, and energy storer, as a ram, guided in the frame, first means for raising said energy storer to a starting point for, when released, producing an impact on said split head so as to sink said blades into the centre portion of a tree stump, and second means for spreading said blades to effect a breaking-up of said stump into separate portions which easily are individually removable in a direction substantially following the extension of the roots.
Dependencies are inferred from the claim text.