Abstract: Improved shredding machine shredding mechanism having elongated wall and gate structure defining a chamber. The chamber walls have margins defining a material entryway at one common end and margins defining a material discharge aperture at the remote end of the chamber from the entryway. An electrically driven rotatable shredder journaled in the wall structure intermediate the entryway and discharge aperture. The gate pivotally mounted externally of the chamber for movement within the chamber at the entryway and extending from a point adjacent to one of the walls divergingly relative to the wall and terminating remote from the pivotal mounting and from the wall defining a progressively constricting chamber as to area of the chamber in latitudinal cross-sectional dimension from entryway to discharge aperture in a selected position of the gate.

Abstract: A shredding machine with a cylindrical rotor mounted to rotate with the axle. The exterior surface of the rotor having a plurality of tapped apertures disposed about the surface in arcuately, axially and helically spaced relationship. The rotor has a plurality of circular axially spaced parallel ring sets fixedly mounted thereon. Each set includes a pair of axially spaced parallel rings. The rings of each set have a plurality of arcuately spaced, axially registering notches. Each ring set is positioned to place between the rings a plurality of the apertures which register axially with the notches. A plurality of arcuate spacer segments arcuately positioned between rings of a set and spaced to have arcuate gaps that register with the tapped apertures and ring notches. The head end of each segment adapted to overlay the leading end flange of an arcuate ripper tooth and the trailing end of the tooth and foot end of the segment being spaced from each other arcuately by the diameter of a threaded aperture.

Abstract: An apparatus for shredding waste material includes first and second cooperating shredding rotors rotatably mounted adjacent to one another in a shredding chamber. Each rotor includes a series of axially spaced toothed ripper blades removably mounted on a shaft and positioned so that the blades of one rotor interleave with the blades of the other rotor. The blades are arranged in a stacked assembly which may be removed as a unit for repair or replacement without removing the rotor shaft. A crank drive arrangement develops relative rotational oscillatory bi-directional motion between the rotors to shred material fed therebetween. The rotors are oscillated out of phase with one another so that their teeth are continuously moving at different relative angular velocities with respect to one another.