Wood chipper knife
AssigneeAndritz Inc.
InventorMats Engnell
Life of this patent
Estimating the term…
Abstract
A wood chipper knife includes a knife body and, in relation to a vertical axis of the wood chipper knife, at least one cutter side, which comprises a top cutting edge portion and a bottom cutting edge portion that intersect to form a cutting edge. The bottom cutting edge portion includes a planar wood attacking portion, which begins at the cutting edge and towards the knife body is followed by a recess. The recess is a pressure release recess, which, from the wood attacking portion, abruptly falls to a bottom of the pressure release recess, and which stretches from the wood attacking portion to the knife body. The knife body comprises a chip guiding portion, which, from the pressure release recess, rises towards the knife body.
Claims20
A wood chipper knife, comprising:
- a knife body having a chip guiding portion;
- and
- at least one cutter side, which comprises a top cutting edge portion and a bottom cutting edge portion that intersect at an acute angle (a) to form a cutting edge,
- wherein the bottom cutting edge portion comprises a planar wood attacking portion, which begins at the cutting edge and towards the knife body is followed by a recess,
- the recess includes a first transition portion, a bottom, and a second transition portion,
- the first transition portion is contoured to abruptly turn from the wood attacking portion to the bottom of the recess,
- at least a portion of the bottom of the recess is planar,
- the second transition portion is contoured to curve from the bottom of the recess to the chip guiding portion, and
- the chip guiding portion is contoured so as to turn from the second transition portion of the recess towards the knife body.
A wood chipper knife, comprising:
- a knife body having a chip guiding portion;
- and
- at least one cutter side, which comprises a top cutting edge portion and a bottom cutting edge portion that intersect at an acute angle (a) to form a cutting edge,
- wherein the bottom cutting edge portion comprises a planar wood attacking portion, which begins at the cutting edge and towards the knife body is followed by a recess, and
- the recess includes a straight portion adjacent to the wood attacking portion and a concave curve portion between the straight portion and a bottom of the recess.
A wood chipper knife, comprising:
- a knife body having a chip guiding portion;
- and
- at least one cutter side, which comprises a top cutting edge portion and a bottom cutting edge portion that intersect at an acute angle (α) to form a cutting edge,
- wherein the bottom cutting edge portion comprises a planar wood attacking portion, which begins at the cutting edge and towards the knife body is followed by a recess,
- the recess includes a first transition portion, a bottom, and a second transition portion, and
- the first transition portion of the recess includes a concave curve portion between the wood attacking portion and the bottom of the recess, a radius of curvature of the concave curve portion being 0.1-1.5 mm.
Dependencies are inferred from the claim text.