Patent ID: 8333282

Claim:
A device for dewatering bulk or free-flowing input material by compacting it, a housing arranged along an axis of rotation, the housing having an input area and a feed and compaction area following axially within a jacket pipe, the jacket pipe having a first section toward the input area having radial passages and a second section adjacent the first section; and a drive shaft having circumferentially extending coils configured to rotate coaxially in the housing for compacting the input material during transport from the input area through the feed and compaction area, wherein residual water is conducted through the radial passages in the jacket pipe from the device, and wherein the jacket pipe second section is provided with an inner pipe that lies at least partially with its external circumference against the inner circumference of the jacket pipe and not in the jacket pipe first section, the inner pipe having openings that are smaller than the passages in the jacket pipe first section, and wherein in the jacket pipe second section, the drive shaft in the feed direction ends in a bearing pin that is free from coils and wherein the inner pipe and jacket pipe extend over the longitudinal section of a radial pin.