Abstract: An improved pivot pin which allows individual pin connection of each hammer in the rotor of a shredder is disclosed. The pivot pin includes male and female pin members which interengage in a tight fit so as to function as a single pin when fitted together. A bore extends through both of the male and female pin members, with the bore through the female pin member being threaded. A securing device such as a socket head capscrew passes through the male pin member from the outer to the inner end portion thereof and is threadedly received in the female pin member.

Abstract: Improved insert teeth and holder assemblies are provided for a material breaker machine intended for use in reducing chunks or pieces of wood, metal and other materials to small size. The present invention includes an insert tooth member having a pair of edges, either of which may serve as a cutting edge. An insert tooth holder is provided for mounting of the insert tooth. The insert tooth and insert holder interengage through a raised portion on the one and a recessed portion on the other which mate to form a positive mechanical lock. The insert tooth is reversibly mounted on the insert holder to allow either of the pair of edges to assume the position of the cutting edge. The location of the interengaged components allows them to be fully protected from the material being cut, thus minimizing wear and damage.

Abstract: A rotor assembly for a shavings making machine having a plurality of knife and wedge assemblies is disclosed. The knife and wedge assemblies are removably mounted in channels or pockets extending parallel to the rotor axis along the length of the circumference of the rotor. In mounting each knife and wedge assembly to the rotor, the knife insert is first mounted on the respective wedge insert and the wedge insert is then mounted on the rotor. The bolts or other means for mounting each knife insert on the wedge insert are located below the periphery of the rotor and adjacent one side wall of the respective channel such that the bolts cannot back out or become loosened due to vibrational forces. Each knife insert has two reversible blades which are symmetrical. A flattened surface on the rotor adjacent each knife insert assists in providing an effective cutting operation. The metallurgical composition of the knife inserts can be varied to accommodate the material in a particular application.

Abstract: A breaker tooth member for apparatus for the reduction of solid material such as wood, plastics, metal and the like comprises a metal head having an integral projecting mounting shank having an enlarged portion adjacent the head adapted to fit snugly in an enlarged mounting bore portion of a support ring, the head being formed opposite the shank with a recess having a flat back face intersecting a ledge defining a locking formation, and an integral harder wear resistant metal sharp edged element is mounted in the recess flush against the back face, that element being correspondingly formed along one edge to interlock with said ledge, and the element is fixed on the head by a plurality of pins having tight friction fit in aligned bores in the head and the element.