Patent ID: 7004413
Filing Date: 2006-02-28
Classification: B02C

Abstract:
1. A grinder tooth for use with a rotatable breaker ring part of a grinder, said breaker ring defining a peripheral ring outer surface and at least one breaker head protruding radially and at least partially from said ring outer peripheral surface for carrying said grinder tooth, said breaker head defining a radially outermost head outer surface, said breaker head also defining a head leading surface and a head trailing surface extending substantially radially between said ring and head outer surfaces respectively in a circumferentially leading and trailing position relative to each other, said breaker head having a head channel extending therethrough between said head leading and trailing surfaces, said grinder tooth comprising: a blade holder, said blade holder defining a blade receiving surface, an opposed shank attachment surface and a holder peripheral surface extending therebetween; a shank, said shank defining a shank longitudinal axis, a shank proximal end attached to said shank attachment surface, a longitudinally opposed shank distal end and a shank intermediate section extending therebetween, said shank extending from said shank attachment surface in a substantially perpendicular relationship relative thereto, said shank being configured and sized for extending through said head channel when said shank attachment surface abuttingly contacts said head leading surface; a blade, said blade having a blade grinding surface, a blade attachment surface and a blade peripheral surface extending therebetween, said blade defining a blade normal axis extending in a substantially perpendicular relationship relative to said blade attachment surface, the intersection of said blade grinding and peripheral surfaces defining at least two grinding edges; a tooth-to-head releasable attachment means for releasably attaching said grinder tooth to said breaker head with said shank extending through said head channel and said shank attachment surface abuttingly contacting at least a portion of said head leading surface; a blade-to-holder releasable attachment means for releasably attaching said blade to said holder with said blade attachment surface engaging at least a portion of said blade receiving surface; said blade and holder being configured and sized so that said blade and holder peripheral surfaces are substantially in register with each other when said blade is attached to said holder; said blade and said holder being configured and sized so that either one of said at least two grinding edges may be positioned radially outwardly by rotating said grinder tooth about said shank longitudinal axis while said blade remains attached to said blade holder, allowing either one of said at least two grinding edges to be selectively used for grinding.