Patent ID: 7284345

Claim:
A milling apparatus for comminuting coarse material, the milling apparatus comprising: a bucket; a receiving chamber in the bucket having a receiving opening on one side and at least one through opening on an opposite side; a milling chamber in the bucket communicating with the receiving chamber via the through opening; a milling rotor disposed in and protruding from the milling chamber, the milling rotor driven to rotate in a direction of rotation and including tools arranged for comminuting material; a first beating arm disposed adjacent to the milling rotor; and a second beating arm associated with the milling rotor and spaced apart from the first beating arm in the direction of rotation, the through opening arranged between the first and second beating arms in the direction of rotation of the milling rotor, wherein the milling apparatus has at least two modes of operation, the first beating arm cooperating with the milling rotor to mill a solid ground layer during a first mode of operation, and the second beating arm cooperating with the milling rotor to comminute material entering the milling chamber from the receiving chamber via the through opening during a second mode of operation.