Patent ID: 7942157

Claim:
A cleaning head to be mounted in a tank for cleaning an interior side thereof, said cleaning head comprising: a stationary housing ( 2 ) with an inlet for receiving cleaning liquid under pressure, a turnable housing ( 3 ) turnably mounted on said stationary housing, a nozzle hub ( 4 ) provided on the turnable housing, the nozzle hub provided with nozzles ( 18 ), a ball bearing ( 13 ) disposed between the nozzle hub ( 4 ) and the turnable housing ( 3 ), the turnable housing ( 3 ) with the nozzle hub ( 4 ) being caused to turn at the same time as the nozzle hub ( 4 ) is rotated relative to the turnable housing, such that cleaning liquid for the cleaning of the internal side of the tank is ejected via the nozzles ( 18 ) by the combined turning and rotating movement of both the turnable housing and the nozzle hub, the nozzle hub ( 4 ) being mounted directly in a ring ( 15 ) provided in the turnable housing ( 3 ), a slide bearing ( 15 , 20 ) formed between opposed surfaces of the ring and nozzle hub, spaced away from the ball bearing ( 13 ), such that as the nozzle hub rotates relative to the ring, a liquid flow passing therebetween flushing passes through the ball bearing ( 13 ) then flushes the slide bearing before and then being discharged for cleaning an exterior of the cleaning head.