Patent ID: 6935585
Filing Date: 2005-08-30
Classification: B02C

Abstract:
1. A grinder head comprising: a grinding bowl for holding a charge of material to be ground and having a restraining boss fixed to a bottom wall of the bowl and projected into the bowl; and, a grinder ring locatable over the boss and freely moveable within the bowl, said grinding ring having an outer circumferential surface and an inner circumferential surface surrounding an opening, the restraining bos received within the opening for limiting movement of the grinding ring, said grinder ring, boss and bowl being relatively dimensioned so that when the inner circumferential surface of the grinding ring contacts a side wall of the boss, the outer circumferential surface of the grinder ring is spaced away from the inner surface of the side wall of the bowl, whereby the grinder ring is freely moveable within said bowl but is prevented from contacting the side wall of the bowl.