Centrifugal cleaner

Claim 1

A HYDROCYCLONIC SEPARATOR INCLUDING A HOLLOW BODY FORMED WITH OVERFLOW AND UNDERFLOW ENDS, AN OPENING AT EACH END AND WITH A LATERAL TANGENTIAL INLET FOR ADMITTING A SLURRY AT THE OVERFLOW END, SAID INLET OCCUPYING A TRANSVERSE PLANE IN SAID BODY, AN OVERFLOW NOZZLE COAXIALLY DISPOSED IN SAID BODY TO HAVE AN INNER END PROJECT, IN A LONGITUDINAL SENSE, INTO SAID BODY THROUGH SAID OPENING IN SAID OVERFLOW END TO AND BEYOND THE TRANSVERSE PLANE OF SAID INLET BUT TERMINATING SUBSTANTIALLY SHORT OF THE UNDERFLOW END OF SAID BODY, CLOSURE MEANS FILLING THE OPENING ABOUT SAID NOZZLE AT THE OVERFLOW END OF SAID BODY, SAID CLOSURE MEANS BEING CHARACTERIZED BY A HELICAL SURFACE PORTION PROJECTING INWARDLY OF SAID BODY AND ABOUT SAID NOZZLE INTERMEDIATE THE INNER EXTREMITY THEREOF AND THE TRANSVERSE PLANE OF SAID INLET AND A FURTHER SURFACE PORTION OF SAID CLOSURE MEANS FORMING A CONTINUATION OF SAID HELICAL SURFACE AND TERMINATING IN A ROOF SURFACE FOR LONGITUDINALLY CIRCULATING CURRENTS OF LOW RADIAL VELOCITY WHICH TEND TO MOVE ABOUT THE INNER EXTREMITY OF SAID NOZZLE, SAID ROOF SURFACE HAVING THE FORM OF AN ANNULAR DEPRESSION WHICH IS ARCUATE IN CROSS-SECTION AND APERATIVE TO SMOOTHLY REVERSE THE FLOW OF SAID LONGITUDINALLY CIRCULATING CURRENTS WHICH IMPACT THEREON.