Abstract: A replaceable tooth arrangement for use in grinding discs such as used in wood hoggers and comminuting equipment. A preferred tooth arrangement includes two end to end adjacent tip portions, or a tip portion end to end with a complementary base portion. The contacting faces of the portions are preferably tapered so that tightening together creates a resultant outward movement which tightens them against the walls of a retaining aperture in a disc or disc section. Alternatively or additionally a connection element interacts with a wedge keeper which causes a similar outward component in the keeper and tip portion, tightening them against the walls of a retaining aperture, as the connection element is tightened.

Abstract: A hogger and reducing apparatus and considers issues associated with fibrous other materials clogging screening apertures A paddle arrangement having an open framework rotates relative to the screening apertures provided on a drum. Either or both the paddle arrangement and drum may rotate, the resultant action increasing agitation of raw material (being reduced in size by a reducing means) in the vicinity of the screening apertures and also providing a wiping type effect to help clear material from within the apertures.

Abstract: The present invention relates to a disk section (1) for use in the construction of a grinding disk (10) such as may be used in wood hogging, chipping, or grinding apparatus. The disk section (1) is associated with a substantially wedge shaped retaining segment (30) which is positioned near the circumference of the assembled grinding disk(10), and preferentially overlaps at least part of two adjacent disk sections (1) thereon. The arrangement is such that tangential type impacts acting on a disk section (1) results in at least partial energy transmission to the retaining segment (30) and its connection (38, 39) to a hub (9).

Abstract: The present invention relates to the use of an agitator (10) positioned near the screen (4) of a hogger to increase turbulence in that region. The induced turbulence from the driven blades (15) of the agitator (10) reorients material contained within the hogger (1), thereby representing the material to the screen (4) and grinding disc (5) with potential improvements in both screening and comminuting efficiency.