Abstract: The solid waste processing device has an infeed plate with an infeed aperture to receive material into the processing device and has a knife with a knife hole. The knife abuts the infeed plate in sliding engagement and slides between a first position which the knife hole aligns with or overlaps the infeed aperture and a second position in which the knife hole is offset from the infeed aperture. With the knife hole aligned with the infeed aperture, material is fed into the infeed aperture and the knife hole. As the knife slides relative to the infeed plate and moves the knife hole out of alignment with the infeed aperture, the material that extends into the knife hole is shorn off.

Abstract: The medical waste disposer has a frame and a receiving chamber connected with the frame. The receiving chamber has a discharge port and an anvil is connected with the receiving chamber adjacent the discharge port. The anvil has an anvil aperture extending through the anvil and aligned with the discharge port. A knife abuts and slides against the anvil along an axis. A knife hole extends through the knife. An assembly plate abuts the knife in sliding engagement to sandwich the knife between the anvil and the assembly plate. The assembly plate also has an opening extending through the plate. A drive is operatively connected with the knife to slide the knife. The knife slides between a first position in which the knife hole overlaps the anvil aperture and a second in which the knife hole is offset from the anvil aperture and overlaps the assembly plate opening. Each of the knife and the assembly plate may have a second hole or opening, spaced along the axis from the first hole or opening.