Oil cleaners

Claim 1

A CENTRIFUGAL OIL CLEANER FOR SEPARATING DIRT FROM OIL INCLUDING A CASING AND A CYLINDRICAL DRUM MOUNTED WITHIN THE CASING FOR ROTATION ABOUT A VERTICAL AXIS, SAID DRUM HAVING TOP, BOTTOM AND SIDE WALLS AND BEING ADAPTED TO RETAIN THE DIRT SEPARATED FROM THE OIL, A HOLLOW VERTICAL SPINDLE EXTENDING AXIALLY THROUGH THE TOP AND BOTTOM WALLS OF THE DRUM ON WHICH SAID DRUM IS MOUNTED FOR ROTATION, THE AXIS OF SAID SPINDLE BEING COINCIDENT WITH THE AXIS OF ROTATION OF SAID DRUM, MEANS FOR CONDUCTING THE OIL TO BE CLEANED TO ONE END OF THE HOLLOW SPINDLE SAID SPINDLE BEING PROVIDED WITH AT LEAST ONE LATERAL PORT OPENING INTO THE INTERIOR OF THE DRUM FOR CONDUCTING OIL TO BE CLEANED FROM THE HOLLOW SPINDLE TO THE INTERIOR OF THE DRUM, AT LEAST ONE OIL DISCHARGE NOZZLE FOR DISCHARGING CLEAN OIL FROM THE DRUM, SAID NOZZLE HAVING AN INLET COMMUNICATING WITH THE BOTTOM OF THE DRUM AND A DISCHARGE PORTION POSITIONED TANGENTIALLY WITH RESPECT TO THE DRUM, WHEREBY SAID DRUM IS CAUSED TO ROTATE BY THE REACTION OF A JET OF CLEAN OIL FLOWING THROUGH THE NOZZLE AND ISSUING THEREFROM, AND A DOWNCOMER PIPE COMMUNICATING WITH THE INLET TO THE NOZZLE AND EXTENDING UPWARDLY IN THE DRUM, SAID DOWNCOMER PIPE HAVING AN ENTRANCE OPENING THEREIN POSITIONED ABOVE THE BOTTOM OF THE DRUM A DISTANCE OF AT LEAST APPROXIMATELY TWO-THIRDS OF THE DRUM HEIGHT AND AT A SUBSTANTIAL DISTANCE INWARDLY FROM THE SIDE WALL OF THE DRUM.