Patent ID: 7409972
Filing Date: 2008-08-12
Classification: B27G,B27L,Y10T

Abstract:
1. A knife assembly for a chipper, which is intended to be installed in a knife frame that forms part of the chipper, said knife assembly comprising: a counter knife fitted to the knife frame; an essentially symmetrical reversible knife set against the counter knife, the reversible knife including two cutting bevel edges disposed at opposite sides of the reversible knife, one of the cutting bevel edges extending further than the counter knife from the knife frame; a clamp for pressing the reversible knife against a side opposite the counter knife; securing means for securing and tightening the clamp onto the knife frame and thus for pressing the reversible knife between the clamp and the counter knife; and at least one locking piece, which is parallel to a longitudinal axis of the reversible knife and extends on both sides of a boundary surface between the reversible knife and the counter knife, for preventing lateral movement of the reversible knife relative to the counter knife, the at least one locking piece forming an integral part of the reversible knife or the counter knife; the reversible knife, the counter knife, and the locking piece being arranged in such a way that the position of the reversible knife relative to the knife frame is set as desired in a lateral direction of the reversible knife; the counter knife having two counter-surfaces arranged to rest on the knife frame, the counter-surfaces forming an acute angle α in the range of 25-75°, for fitting the counter knife to the knife frame using shape-locking.