Patent ID: 7159806

Claim:
A cutting assembly for size reduction of solids in a liquid to be pumped, said cutting assembly comprising: a. a drive shaft rotatable in a first direction of rotation; b. a rotary cutter rotatably engaged with said drive shaft and comprised of at least a first cutting blade and a second cutting blade, each of said first and said second cutting blades including a leading cutting edge advanceable in said direction of rotation, said leading cutting edge formed at a junction of a leading side wall of said blade and a flat base of said blade; c. a plate cutter comprised of an apertured wall including an inner discharge surface, and an outer cutter surface, said outer cutter surface including a plurality of cutting ports, each of said cutting ports comprising an entry opening, a first orifice passing through said apertured wall to said inner discharge surface, and a second orifice passing though said apertured wall to said inner discharge surface, said entry opening further comprising: i) a first V-slice cutting edge and a second V-slice cutting edge intersecting at an angle directed opposite to said direction of rotation; ii) a first cutting edge of said first orifice connected to said first V-slice cutting edge; and iii) a second cutting edge of said second orifice connected to said second V-slice cutting edge; wherein when said rotary cutter is rotated in said first direction of rotation, said cutting blades are rotationally advanced along said outer cutter surface of said plate cutter in a shearing action against said first V-slice cutting edge, said second V-slice cutting edge, said first cutting edge of said first orifice, and said second cutting edge of said second orifice of said cutting ports of said outer cutter surface of said plate cutter.