Patent ID: 7137421
Filing Date: 2006-11-21
Classification: B27L,Y10T

Abstract:
1. A chipper knife for use in a rotating wood chipper disk, said knife comprising a knife body having first and second opposed body surface portions, at least one cutting edge having first and second ends, and first and second angularly related guiding surfaces which extend at angles to said first and second body surface portions respectively and intersect to define said cutting edge, said first guiding surface having a varying angle along its length in relation to its associated first body surface portion with the angle adjacent said first end being greater than the angle at the second end and continually decreasing from said first to said second end; said second guiding surface having a varying angle along its length in relation to its associated second body surface portion with the angle adjacent the first end being smaller than the angle at the second end and continually increasing from said first to said second end, whereby the cutting edge angle between the guiding surfaces is essentially constant along the length of the cutting edge while the cutting edge is closer to said second body surface portion at said first end of the cutting edge than it is at the second end.