Sand or fines filtering device for dryers

Claim 1

APPARATUS FOR DRYING COMPOSITE AGGREGATES USED IN THE PAVING INDUSTRY AND THE LIKE, COMPRISING: A FIRST CYLINDRICAL SHELL HAVING AN INLET AT ONE END AND AN OUTLET AT THE OTHER END; MEANS FOR SUPPLYING AGGREGATE MATERIAL TO SAID FIRST CYLINDRICAL SHELL AT THE INLET END, SAID FIRST CYLINDRICAL SHELL HAVING HOT COMBUSTION GASES ADMITTED INTO THE OUTLET END TO CONTACT SAID AGGREGATE MATERIAL; A SECOND CYLINDRICAL SHELL SHORTER AND OF SMALLER EXTERNAL DIAMETER THAN SAID FIRST SHELL AND CONCENTRICALLY MOUNTED THEREIN SO AS TO DEFINE, WITH A PORTION OF SAID FIRST SHELL AT THE OUTLET END THEREOF, AN ANNULAR CHAMBER BETWEEN SAID SHELLS, THE OUTLET END OF SAID CHAMBER BEING ADJACENT THE OUTLET END OF SAID FIRST SHELL; A FRUSTO-CONICAL GRIZZLY EXTENDING BETWEEN THE INTERIOR END OF THE SECOND SHELL AND THE INNER SURFACE OF THE FIRST SHELL AND HAVING PERFORATIONS COMMUNICATING AT THE INTERIOR SIDE OF SAID GRIZZLY WITH THE INTERIOR OF SAID FIRST SHELL AND COMMUNICATING AT THE OPPOSITE SIDE WITH SAID CHAMBER, AND A PLURALITY OF ANNULARLY SPACED LIFTERS SECURED WITHIN SAID SHELL AND EXTENDING LONGITUDINALLY THEREOF IN BOTH DIRECTIONS FROM SAID GRIZZLY.