Adjustable screen for material destruction apparatus

摘要

An adjustable screen apparatus for a material destruction device includes a first stationary fixed member and a second member positioned in an operatively juxtaposed and nesting relationship for reciprocal movement relative to the first member, each having a predetermined plurality of openings which are disposed in a predetermined pattern. A guide system is provided for guiding the reciprocal movement of the second member relative to the first member. A power operated drive is coupled to a source of power and to the second member for reciprocally moving the second member between a first position wherein each opening in the second member substantially overlaps a respective opening in the first member for producing large size particles and a second position wherein each opening in the second member partially overlaps each of a pair of adjacently disposed openings in the first member for producing small size particles.