Patent ID: 7152348

Claim:
An excavation assembly comprising; a frame with a first and second end; a drive component operatively mounted at the first end; a head shaft disposed along an axis and being operatively mounted at the second end; a drive sprocket operatively mounted to the drive component; an excavation drum operatively rotatably mounted onto the head shaft and including excavation members operatively mounted in a first periodic pattern, a circumference of the excavation drum being an integer multiple of a period of said first periodic pattern; a driven sprocket operatively mounted to the excavation drum; an excavation chain routed around both the drive sprocket and the driven sprocket for transferring power from drive component to excavation drum; and including excavation members mounted in a second periodic pattern, the circumference of the excavation drum being an integer multiple of a period of said second periodic pattern; wherein the excavation drum is mounted onto the head shaft in a manner that the excavation drum cooperates with the excavation chain and the second periodic cutter pattern of the excavation chain to stay in consistent alignment with the first periodic pattern of the excavation drum.