Magnetic separator

Claim 1

APPARATUS FOR SEPARATING THE MAGNETIC MATERIALS FROM MUNICIPAL REFUSE AND THE LIKE WHICH INCLUDES A MIXTURE OF MAGNETIC AND NONMAGNETIC MATERIALS, COMPRISING: A NONMAGNETIC MATERIAL TUBULAR DRUM WHICH IS OPEN AT ITS OPPOSITE ENDS AND HAS A PLURALITY OF CIRCUMFERENTIALLY SPACED SLOTS THEREIN EXTENDING LENGTHWISE ALONG THE DRUM FOR A MAJOR PORTION OF ITS LENGTH, SUPPORT MEANS ROTATABLY SUPPORTING THE DRUM IN AN INCLINED POSITION, MEANS FOR ROTATING THE DRUM AROUND ITS LONGITUDINAL AXIS, MEANS FOR FEEDING THE MIXTURE INTO THE HIGHER END OF THE DRUM, DISCHARGE CONVEYOR MEANS EXTENDING INTO THE DRUM ADJACENT THE DOWNWARDLY MOVING SIDE OF THE DRUM, SAID DISCHARGE CONVEYOR MEANS BEING OF A SIZE AND POSITIONED TO EXTEND SUBSTANTIALLY FROM A VERTICAL PLANE PASSING THROUGH THE CENTER OF THE DRUM INTO PROXIMITY WITH THE DOWNWARDLY MOVING SIDE OF THE DRUM, A MAGNETIC MATERIAL BAR SECURED IN EACH OF SAID SLOTS AND EXPOSED TO THE INTERIOR OF THE DRUM, A MAGNETIZING WINDING AND A BUCKING WINDING ON EACH OF SAID BARS, A PAIR OF SLIP RINGS OF ELECTRICALLY CONDUCTIVE MATERIAL SUPPORTED IN FIXED POSITIONS CONCENTRICALLY AROUND THE DRUM, INSULATION BETWEEN SAID SLIP RINGS, A SOURCE OF DIRECT CURRENT ENERGY CONNECTED TO SAID SLIP RINGS, AND A PAIR OF BRUSHES CARRIED BY EACH BAR IN POSITIONS TO SLIDINGLY ENGAGE SAID SLIP RINGS DURING ROTATION OF THE DRUM, SAID BRUSHES BEING CONNECTED TO THE OPPOSITE ENDS OF THE RESPECTIVE MAGNETIZING WINDINGS WHEREBY SAID BARS ARE CONNECTED IN ELECTRICAL PARALLEL TO PERMIT INDIVIDUAL FUNCTIONING THEREOF, AND MEANS FOR ENERGIZING THE BUCKING WINDINGS OF THE BARS WHILE THE BARS ARE IN THE UPPER HALF OF THE DOWNWARDLY MOVING SIDE OF THE DRUM WHEREBY SAID MAGNETIC MATERIALS ADHERE TO SAID BARS DURING APPROXIMATELY THREE-FOURTHS OF THE PERIOD OF ROTATION OF SAID DRUM AND ARE RELEASED FROM SAID BARS DURING APPROXIMATELY ONE-FOURTH OF THE PERIOD OF ROTATION OF SAID DRUM.