Method and apparatus for sizing solid particles

Claim 1

IN A SEPARATOR, THE COMBINATION OF AN OUTER CLOSED CASING HAVING A CONE WITH ITS APEX AT THE BOTTOM AND A DRUM ABOVE SAID CONE, SAID DRUM INCLUDING A TOP WALL PORTION, AN INNER CLOSED CASING COMPOSED OF A CONE WITH ITS APEX AT THE BOTTOM AND A DRUM ABOVE THE CONE, SAID DRUM INCLUDING A TOP WALL PORTION, SAID INNER CLOSED CASING BEING SPACED FROM THE OUTER CASING AND DEFINING A CHAMBER THEREBETWEEN, NORMALLY CLOSED VALVE MEANS CONTROLLING DISCHARGE FROM THE BOTTOM OF EACH OF SAID CASINGS, AN OUTLET PORT FORMED IN THE TOP WALL PORTION OF THE DRUM OF THE INNER CASING, A VACUUM FAN MOUNTED BETWEEN THE TOP WALL PORTION OF THE INNER DRUM AND THE TOP WALL PORTION OF THE OUTER DRUM, SAID OUTLET PORT FORMED IN THE TOP WALL PORTION OF THE DRUM OF THE INNER CASING PROVIDING AN INLET TO SAID VACUUM FAN AND FORMING THE SOLE COMMUNICATION BETWEEN THE CHAMBERS DEFINED BY SAID CASINGS, DRIVEN SHAFT MEANS PROJECTING THROUGH THE TOP WALL OF THE OUTER CASING AND WITHIN THE INNER CASING, A CENTRIFUGAL DISTRIBUTOR PLATE MOUNTED ON THE LOWER END PORTION OF SAID SHAFT AND SPACED FROM THE TOP WALL PORTION OF THE DRUM OF SAID INNER CASING, A ROTARY SIZING DEVICE POSITIONED WITHIN THE INNER CASING ABOVE THE DISTRIBUTOR PLATE AND CONNECTING THE VACUUM FAN AND ROTARY SIZING PLATE AND CONNECTING THE VACCUM FAN AND ROTARY SIZING DEVICE TO PROVIDE A UNIFORM CONTINUOUS ROTATION OF THE PARTS, MEANS DISCHARGING FINELY DIVIDED SOLID MATERIAL INTO SAID INNER CASING AND UPON SAID DISTRIBUTOR PLATE FOR CENTRIFUGAL DISPERSION, AIR INLET MEANS CONNECTED TO THE INNER CHAMBER AT A POINT BELOW THE DISTRIBUTOR PLATE FOR PROVIDING AIR FOR MOVEMENT BY SAID FAN THROUGH THE MATERIAL CENTRIFUGALLY DISPERSED BY SAID CENTRIFUGAL DISTRIBUTOR PLATE AND SAID SIZING DEVICE FOR DISCHARGE OUT