Pulverizing apparatus with oversize recirculation

Claim 1

A PULVERIZING APPARATUS OF THE TYPE DESCRIBED COMPRISING MEANS PROVIDING A MILLING CHAMBER HAVING AN INLET ADJACENT ONE END AND AN AXIAL OUTLET AT ITS OPPOSITE END, ROTOR MEANS SUPPORTED FOR ROTATION IN SAID CHAMBER MEANS FOR PULVERIZING MATERIAL ENTERING SAID INLET AND IMPARTING CIRCULAR MOTION TO SAID MATERIAL SO THAT LARGER PARTICLES TEND TO GRAVITATE TOWARD THE PERIPHERY OF SAID CHAMBER MEANS, MEANS PROVIDING A LATERAL OPENING IN SAID CHAMBER MEANS UPSTREAM FROM SAID AXIAL OUTLET FOR RECEIVING PULVERIZED PARTICLES GRAVITATING TOWARD THE PERIPHERY OF THE CHAMBER MEANS, MEANS DISPOSED WITHIN SAID CHAMBER MEANS AND IN THE VICINITY OF THE PERIPHERY THEREOF AND OF THE ROTOR MEANS FOR DIRECTING PORTIONS OF SAID PARTICLES INTO SAID OPENING, AND PASSAGEWAY MEANS CONTINUOUSLY PROVIDING OPEN COMMUNICATION BETWEEN SAID LATERAL OPENING AND SAID INLET FOR DIRECTING PARTICLES ENTERING SAID LATERAL OPENING BACK TO THE INLET.