Adjustable screen for material destruction apparatus

A material grinding apparatus comprising;

• (a) a housing;
• (b) a rotor mounted for rotation adjacent one end of said housing;
• (c) a first drive means for rotating said rotor;
• (d) an input chamber formed in open communication with a top surface of said housing for receiving material to be ground;
• (e) means for biasing said received material toward said rotor;
• (f) a screen means which is positioned adjacent said rotor and between opposed sides of such housing, said screen means including a stationary fixed member and a movable member which is disposed in an operatively juxtaposed and nesting relationship for a reciprocal movement relative to said fixed member, each having a predetermined plurality of openings disposed in a predetermined pattern;
• (g) a second drive means coupled to a source of power supply and having a linearly moving member thereof attached directly to said movable member for reciprocally moving said movable member between a first position wherein each opening in said movable member substantially overlaps a respective opening in a fixed member for producing large size particles and a second position wherein said each opening in said movable member partially overlaps each of a pair of adjacently disposed openings in said fixed member for producing small size particles;
• and
• (h) a control means for operating each of said first drive means, said material biasing means and said second drive means.

A mobile material destruction system comprising;

• (a) a vehicle having a cab and a storage compartment for storing destructed material;
• (b) a material destruction apparatus which is capable of destructing material and for delivering said destructed material into said storage compartment;
• (c) a lift apparatus operatively mounted adjacent said material destruction apparatus for delivering a material to be destructed into an input chamber of said material destruction apparatus;
• (d) a power operated adjustable screen means for producing different size particles of said destructed material, said screen means having a stationary fixed member and a movable member which is disposed in an operatively juxtaposed and nesting relationship for a reciprocal movement relative to said fixed member, each having a predetermined plurality of openings disposed in a predetermined pattern, said fixed and said movable members being positioned between an opening into said storage compartment and an output portion of said material destruction apparatus, and a drive means coupled to a source of power supply and having a linearly moving member thereof attached directly to said movable member for moving said movable member between a first position wherein each opening in said movable member substantially overlaps a respective opening in a fixed member for producing large size particles and a second position wherein said each opening in said movable member partially overlaps each of a pair of adjacently disposed openings in said fixed member for producing small size particles;
• and
• (e) a control means which is mounted remotely from said screen means for selectively operating said drive means to reciprocally move said movable member between said first position and said second position.

In combination with at least one of a material grinder and a hammer mill having a housing and a material destruction member operatively mounted in the housing, an adjustable screen apparatus comprising:

• (a) a first member stationary fixed adjacent the material destruction member and between opposed sides of the housing, said first member having a predetermined plurality of first openings disposed in a first predetermined pattern;
• (b) a second member positioned in an operatively juxtaposed and nesting relationship for a reciprocal movement relative to said first member, said second member having a predetermined plurality of second openings disposed in a second predetermined pattern;
• (c) a pair of guide rails positioned adjacent opposed edges of said first member and attached thereto in a parallel relationship with each other;
• (d) a first pair of housings attached to said second member adjacent one edge thereof and a second pair of housings attached to said second member adjacent an opposed edge thereof, wherein each housing encases a respective one of said pair of guide rails for guiding said reciprocal movement of said second member;
• and
• (e) a power operated drive means coupled to a source of power supply and to said second member for reciprocally moving said second member between a first position wherein each of said plurality of said second openings substantially overlaps a respective one of said plurality of said first openings for producing large size particles and a second position wherein said each of said plurality of said second openings partially overlaps each of a pair of adjacently disposed first openings for producing small size particles.

In combination with at least one of a material grinder and a hammer mill having a housing and a material destruction member operatively mounted in such housing, an adjustable screen apparatus comprising:

• (a) a first member which is stationary fixed adjacent such material destruction member and between opposed sides of such housing, said first member having a predetermined plurality of first openings which are disposed in a first predetermined pattern;
• (b) a second member positioned in an operatively juxtaposed and nesting relationship for a reciprocal movement relative to said first member, said second member having a predetermined plurality of second openings which are disposed in a second predetermined pattern;
• (c) a guide means for guiding said reciprocal movement of said second member relative to said first member;
• and
• (d) a power operated actuator coupled to a source of power supply, said power operated actuator attached to said first member adjacent an exterior surface thereof and between opposed ends of said first and second members, said power operated actuator having a linearly moving member thereof attached directly to an end of said second member for reciprocally moving said second member between a first position wherein each of said plurality of said second openings substantially overlaps a respective one of said plurality of said first openings for producing large size particles and a second position wherein said each of said plurality of said second openings partially overlaps each of a pair of adjacently disposed first openings for producing small size particles.