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US 4,069,847 AGranted
Tree shear with spherical blades
AssigneeCaterpillar Tractor Co.
InventorLeon A. Wirt
Life of this patent
Estimating the term…
Abstract
A tree-shear apparatus includes two blades, each having a spherical blade portion. The blades are pivotally mounted relative to a frame, with the pivot axes of the blades and the radii of the spherical blade portions being arranged to provide that a true spherical cut of a tree is achieved.
Claims4
A tree cutting apparatus comprising:
- frame means;
- a first blade pivotally mounted relative to the frame means so as to be pivotable relative thereto about a first axis;
- a second blade pivotally mounted relative to the frame means so as to be pivotable relative thereto about a second axis;
- the blades being movable to open and closed positions through said pivoting thereof;
- the first and second axes intersecting at a point of intersection spaced above the cutting planes of said first and second blades;
- the first and second blades defining respective blade portions the blade portions being configured as respective sphere portions;
- the centers of the respective sphere portions being coincident, the radii of the respective sphere portions being equal;
- the centers of the respective sphere portions lying at the point of intersection of the first and second axes.
5 more elements
Dependencies are inferred from the claim text.