Pulverizing apparatus

Claim 1

IN MATERIAL PULVERIZING APPARATUS, AN OUTER HOLLOW INVERTED CONE OF FRUSTO-CONICAL SHAPE HAVING AN AIR INLET OPENING IN ITS LOWER END, AN INNER INVERTED HOLLOW CONE MOUNTED FOR ROTATION INSIDE THE OUTER CONE, THE SIDES OF THE CONES DIVERGING UPWARDLY AND ARRANGED IN CONCENTRIC SPACED RELATIONSHIP TO EACH OTHER TO FORM AN ANNULAR GRINDING CHAMBER THEREBETWEEN COMMUNICATING AT ITS LOWER END WITH THE INLET OPENING IN THE OUTER CONE, MEANS TO ROTATE THE CONES IN OPPOSITE DIRECTIONS TO ONE ANOTHER ABOUT A SUBSTANTIALLY VERTICAL COMMON AXIS, THE INNER CONE BEING ADAPTED TO DISCHARGE MATERIAL LATERALLY AND INTO THE GRINDING CHAMBER, MEANS TO FEED RAW MATERIAL TO BE COMMINUTED TO A DESIRED FINENESS INTO THE INNER CONE, INCLUDING A HOPPER, AN UPRIGHT DELIVERY TUBE HAVING AN INLET AT ITS UPPER END CONNECTED TO THE HOPPER AND HAVING AN OUTLET AT ITS LOWER END ARRANGED TO DISCHARGE THE RAW MATERIAL INTO THE INNER CONE, A MOTOR-DRIVEN SHAFT EXTENDING THROUGH THE DELIVERY TUBE, A ROTATABLE MATERIAL DISTRIBUTING MEMBER CONNECTED TO THE LOWER END OF THE SHAFT AND ARRANGED BELOW THE OUTLET END OF THE DELIVERY TUBE TO INTERCEPT THE RAW MATERIAL DISCHARGED FROM THE DELIVERY TUBE, WHEREBY THE RAW MATERIAL MAY BE DISTRIBUTED ONTO THE SIDES OF THE INNER CONE, MEANS CONNECTED TO THE INLET OPENING OF THE OUTER CONE TO ADMIT AN AIR STREAM INTO THE LOWER AREA OF THE GRINDING CHAMBER, AND OUTLET MEANS CONNECTED TO THE UPPER AREA OF THE GRINDING CHAMBER TO CONVEY THE AIR STREAM AND COMMINUTED MATERIAL CARRIED THEREBY FROM THE GRINDING CHAMBER.