Patent ID: 6840315

Claim:
A device for cleaning an inner pipe which comprises: a nozzle head comprised of a feed borehole axially disposed therein, at least two rotation nozzles communicating with the feed borehole and extending perpendicularly from the longitudinal axis of the feed borehole, at least two cleaning nozzles communicating with the feed borehole and extending downwardly at an angle from the longitudinal axis of the feed borehole,; and a shaft; a rinsing nozzle communicating with the feed borehole and extending upwardly at an angle from the longitudinal axis of the feed borehole; and an outer sleeve adapted to receive a hollow rod, the shaft being received in the outer sleeve whereby when the device is inserted into an inner pipe and a medium is flowed through the borehole and out of the rotation nozzles a force is generated when the medium emerging from the rotation nozzles contacts the wall of the inner pipe which force causes the nozzle head to rotate, the outer sleeve comprising a first means for preventing the nozzle head from descending into the inner pipe disjoined from the outer sleeve when the nozzle head has a first break, the cross-section of which lies above the first means for preventing and a second means for preventing the nozzle head from descending into the inner pipe disjoined from the outer sleeve when the nozzle head has a second break, the cross-section of which lies above the second means for preventing, the first means for preventing comprising an intermediate sleeve interposed between the outer sleeve and the shaft, the intermediate sleeve having a shoulder that prevents the nozzle head from descending into the pipe disjoined from the outer sleeve when the nozzle head has the first break.