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Claim 1

IN A MIXING APPARATUS, A CONTAINER HAVING A MATERIAL RECEIVING STATION AND A MIXTURE DISCHARGING STATION; AND A MIXER STRUCTURE MOUNTED FOR ROTATION IN SAID CONTAINER ABOUT AN AXIS EXTENDING FROM SAID RECEIVING STATION TO SAID DISCHARGING STATION AND COMPRISING A CENTRAL SHAFT, MATERIAL MIXING AND FEEDING MEANS MOUNTED ON SAID SHAFT AND INCLUDING A FIRST SET OF BLADES WITHIN A FIRST ZONE ADJACENT SAID RECEIVING STATION AND TERMINATING AT A PART OF SAID SHAFT INTERMEDIATE SAID RECEIVING STATION AND SAID DISCHARGING STATION, THE BLADES OF SAID FIRST SET RESPECTIVELY BEING INCLINED ABOUT THEIR OWN AXES AT AN ANGLE WITH REFERENCE TO THEIR PLANES OF ROTATION WHEREBY TO TEND TO FORCE MATERIAL TOWARD SAID DISCHARGING STATION, AND MATERIAL MIXING AND FEED OPPOSING MEANS INCLUDING A SECOND SET OF BLADES WITHIN A SECOND ZONE EXTENDING FROM SAID INTERMEDIATE PART OF SAID SHAFT TO SAID DISCHARGING STATION AND BEING INCLINED ABOUT THEIR OWN AXES OPPOSITELY TO THE INCLINATION OF SAID FIRST SET WHEREBY TO TEND TO FORCE MATERIAL TOWARD SAID RECEIVING STATION IN OPPOSITION TO THE FORCING OF MATERIAL BY SAID MATERIAL MIXING AND FEEDING MEANS, THE LATTER EXERTING A GREATER FORCE ON THE MATERIAL THAN SAID MATERIAL MIXING AND FEED OPPOSING MEANS WHEREBY SAID MATERIAL WILL BE FED FROM SAID RECEIVING TO SAID DISCHARGING STATION.