Back to results
US 4,913,203 AGranted
Tree harvester
AssigneeLess Micanik Inc.
InventorMichel Lessard
Life of this patent
Estimating the term…
Abstract
A tree shear is disclosed which has a frame on which is mounted a pair of blades for pivotal movement relative to one another in scissors fashion; the blades being pivoted by hydraulic jacks. Each blade pivots on a rotary shaft having an eccentric center portion, each blade being mounted on the eccentric portion so that, as the shaft rotates, it causes the blade to oscillate.
Claims11
In a tree shear comprising:
- a frame;
- a pair of shear blades mounted on said frame for pivotal movement relative to one another in scissors fashion, and power means for pivoting said blades, the improvement wherein:
- said blades are mounted on said frame by pivot means including oscillation means for causing said blades to move back and forth in the planes thereof as said blades are pivoted by said power means wherein said oscillation means are eccentric means.
A tree harvester comprising:
- an elongated boom;
- a tree working head comprising:
- an elongated frame having a longitudinal axis;
- a pair of shear blades mounted on said frame for pivotal movement in scissors fashion relative to one another in a plane normal to said frame longitudinal axis, and power means for pivoting said blades;
- wherein said blades are mounted on said frame by pivot means including oscillation means for causing said blades to move back and forth in said normal plane as said blades are pivoted by said power means;
- means pivotally mounting said head on one end of said boom, and
- power means, on said head and on said boom, for so pivoting said head between a position wherein said head stands essentially parallel to said boom and a vertical position for shearing trees wherein said oscillation means are eccentric means comprising, for each one of said blades, a rotary shaft having an eccentric center portion on which said one blade is mounted.
4 more elements
Dependencies are inferred from the claim text.