A rotary nozzle for a high pressure cleaning apparatus has a liquid driven rotor inclined to the axis of the rotor housing in which it is received and an O-ring engaging an annular region of the housing to drive the rotor so that it orbits the axis of the housing since either the drive ring or the annular...http://www.google.de/patents/US5598975?utm_source=gb-gplus-sharePatent US5598975 - Rotor nozzle, especially for a high pressure cleaning apparatus
