Patent ID: 6997650

Claim:
A helical rotary cutter comprising: a rotor having an outer surface, a left end, a right end, a rotor axis, a left end bearing support concentric with the rotor axis and extending axially to the left of the left end, and a right end bearing support concentric with the rotor axis and extending axially to the right of the right end; a plurality of grooves in said rotor extending from the left end to the right end; a first groove wall in a first wall plane extending axially from the left end to the right end, extending outward away from the rotor axis and in the direction of rotation, and wherein said first wall plane intersects the rotor axis; a plurality of first base support surfaces, that are each in a base support plane that is perpendicular to the first wall plane and wherein all the base support planes that are perpendicular to said first groove wall intersect each other; a plurality of first rectangular flat cutter blades each of which has a left blade end, a right blade end, a cutting edge and a base that is parallel to the cutting edge and wherein the base of each of the plurality of first rectangular cutter blades is seated on one of the plurality of first base support surfaces; and at least one clamp member clamping the plurality of first rectangular flat cutter blades to the first groove wall.