Centrifugal type separator

Claim 1

APPARATUS FOR SEPARATING AND CLASSIFYING FRAGMENTARY MATERIALS CONTAINING PARTICLES OF DIFFERENT SPECIFIC GRAVITIES, WHICH COMPRISES A SEPARATION CHAMBER OF INVERTED CONICAL FORM HAVING A SLOPING WALL, MEANS FOR SUPPLYING A MIXTURE OF THE PARTICLES IN WATER TO THE CHAMBER THROUGH AN INLET AT AN UPPER LEVEL INTO SAID CHAMBER AND CAUSING IT TO SWIRL DOWNWARDLY TOWARD AN OUTLET FOR PARTICLES OF HIGHER SPECIFIC GRAVITY AT A LOWER LEVEL OF SAID CHAMBER, A CENTRIFUGAL PUMP OF THE MULTIPLE IMPELLER TYPE MOUNTED IN COOPERATION WITH SAID CHAMBER, A SUCTION TUBE FOR EACH IMPELLER OF THE PUMP MOUNTED FOR ROTATION THEREWITH, ALL OF SAID SUCTION TUBES BEING DISPOSED COAXIALLY IN SAID CHAMBER AND SPACED FROM EACH OTHER AND DEPENDING IN SAID CHAMBER TO PROVIDE INLET LOWER ENDS AT A LEVEL INTERMEDIATE SAID CHAMBER INLET AND OUTLET SO AS TO WITHDRAW UPWARDLY FROM THE CHAMBER THE PARTICLES OF LOW SPECIFIC GRAVITY, SAID CHAMBER WALL CONVERGING TOWARD SAID SUCTION TUBES, SAID ENDS OF SAID TUBES BEING LOCATED AT SUCCESSIVELY DIFFERENT LOWER LEVELS WITH THE END OF THE OUTER-