Patent ID: 7896274

Claim:
A grinding machine, comprising: a) a grinding chamber including a grinding drum; b) a conveying system that transports material to the grinding chamber, the conveying system defining a conveying plane; and c) an anvil located between the grinding chamber and the conveying system, wherein material fed into the grinding chamber by the conveying system passes over the anvil, the anvil including: i) a base portion having a first end, a second end, and side surfaces extending between the first and second ends, the base portion defining a recessed impact plane, the recessed impact plane being located below the conveying plane of the conveying system; ii) a ramped surface extending upward from the recessed impact plane of the base portion; and iii) a longitudinal edge defined by the conjunction of the ramped surface and one of the side surfaces, the longitudinal edge being located a distance above the recessed impact plane, the longitudinal edge further being located at or below the conveying plane of the conveying system.