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Claim 1

A ROTARY DRUM FILTER COMPRISING A SUPPORTING FRAME INCLUDING A TANK ADAPTED TO CONTAIN A LIQUID-SOLID MIXTURE TO BE FILTERED, A CYLINDRICAL DRUM HAVING A FORAMINOUS SURFACE ADAPTED TO ACCRETE A FILTER CAKE THEREON, SAID DRUM BEING DISPOSED FOR ROTATION ABOUT A HORIZONTAL AXIS AND BEING PARTIALLY SUBMERGED IN A LQUID-SOLID MIXTURE IN SAID TANK, AND MEANS SUPPORTING SAID DRUM INCLUDING AXIALLY EXTENDING CYLINDRICAL RIM MEANS AT EACH END OF SAID DRUM AND TWO PERIPHERALLY SPACED PAIRS OF ROLLERS SUPPORTED FOR ROTATION ON SAID FRAME ABOVE THE AXIS OF SAID DRUM AT EACH END OF SAID DRUM ENGAGING EACH SAID RIM MEANS IN COOPERATING RELATIONSHIP ON OPPOSITE SIDES THEREOF, THE ROLLERS OF EACH SAID SPACED PAIRS OF ROLLERS BEING RADIALLY ALIGNED, ONE RADIALLY INWARDLY AND ONE RADIALLY OUTWARDLY OF SAID RIM MEANS TO CLAMP SAID RIM MEANS DIRECTLY BETWEEN THE ROLLERS OF EACH PAIR, WITH SAID PAIRS OF ROLLERS AT EACH END OF SAID DRUM BEING PERIPHERALLY SPACED ALONG SAID RIM MEANS FOR SUPPORTING THE DRUM FOR ROTATION, EACH SAID ROLLER RADIALLY OUTWARDLY OF SAID RIM MEANS BEING SUPPORTED BY MEANS OF AN ARM PIVOTALLY MOUNTED ON SAID SUPPORTING FRAME, RESILIENT MEANS FOR URGING EACH SAID RADIALLY OUTWARD ROLLER INTO ENGAGEMENT INTO SAID RIM FOR SECURELY POSITIONING SAID DRUM, EACH SAID ARM BEING ADAPTED TO BE PIVOTED SO THAT SAID RADIALLY OUTWARD ROLLER MAY BE MOVED GENERALLY AWAY FROM SAID RIM TO PERMIT REMOVAL OF SAID DRUM FROM SAID SUPPORTING FRAME, AND DRIVE MEANS INCLUDING A DRIVEN SHAFT SUPPORTED ON SAID RAME ABOVE THE AXIS OF SAID DRUM, A PINION GEAR CARRIED ON AND DRIVEN BY SAID SHAFT, AND GEAR MEANS AROUND THE PERIPHERY OF SAID DRUM IN ENGAGEMENT WITH SAID PINION GEAR FOR DRIVING SAID DRUM ON SAID ROLLERS.