Patent ID: 8474738

Claim:
An impact mill, comprising a driving apparatus, a rotor apparatus comprising two coaxial rotors with shafts wherein a first rotor is equipped with blades having impact surfaces and which blades form one or more rings coaxial with said first rotor, wherein said rings are located at different distances from a rotational axis of said rotor, a second rotor is equipped with blades having impact surfaces and which blades form one or more rings coaxial with said second rotor, wherein said rings are located at different distances from a rotational axis of said rotor, and the rings of the first and second rotor are arranged in an intermeshed fashion, wherein the shaft of the second rotor is fitted inside the shaft of the first rotor, wherein the impact mill further comprises transmission machinery arranged to distribute rotating motion generated by the driving apparatus to the shafts of both of the rotors to rotate the same, said transmission machinery comprising a secondary shaft equipped with a conic gear, wherein said secondary shaft is driven by the driving apparatus directly, and wherein the conic gear at said secondary shaft is arranged to rotate a conic gear at the shaft of the first rotor in one direction and the conic gear at the shaft of the second rotor in an opposite direction of rotation, and wherein said driving apparatus is a single motor.