Patent ID: 7494080

Claim:
An impact hammer assembly mountable on the drum of a rotary crusher, said impact hammer comprising: a body block having at least one tungsten carbide crusher insert welded thereto, said body block also having a generally cylindrical mounting post, said mounting post having a cylindrical aperture and a tapered socket which are adjoining and axially aligned; a drum attachment bolt having a shank insertable through the cylindrical aperture and a tapered head which is wedged into the tapered socket with an interference fit, said shank passing through a portion of the drum; and a supernut having an annular component threadably securable to a lower portion of said shank, said annular component having a plurality of threaded apertures, each of which has an axis which is parallel to a major central axis of the supernut, said supernut also having a plurality of threaded locking posts, each of which threadably engages a threaded aperture, said plurality of threaded locking posts being individually tightenable to tension and stretch the shank of said bolt.