Patent ID: 8646542

Claim:
A rear tiller for a tracked vehicle for snow-trail preparation and maintenance comprising a driven working shaft arrangement rotatably mounted in a preparation housing that is open towards a ground, wherein the preparation housing has at least two housing envelope portions mounted so as to be movable in a fan-like manner relative to a rotational axis of the driven working shaft arrangement and relative to one another in a circumferential direction, the at least two housing envelope portions comprising at least one stationary housing envelope portion and at least one movable housing envelope portion, the at least one movable housing envelope portion being mounted so as to be displaceable relative to the at least one stationary housing envelope portion and relative to the rotational axis of the working shaft arrangement as viewed in the circumferential direction in such a way that, in a first end position, the at least two housing envelope portions overlap one another in the circumferential direction and, in a second end position, the at least one movable housing envelope portion extends from the at least one stationary housing envelope portion in a substantially aligned manner, and in that the at least one movable housing envelope portion has a wall that is arcuate in cross-section and that overlaps the at least one stationary housing envelope portion on an inside thereof in the circumferential direction, at least to a large extent, and abuts an internal arcuate wall of the at least one stationary housing envelope portion.