Grain dryer

Claim 1

A GRAIN DRYER COMPRISING, SPACED IMPERFORATE END WALL MEANS, AN ENCLOSED INNER CAGE EXTENDING BETWEEN SAID END WALL MEANS AND INCLUDING LATERALLY SPACED GENERALLY UPRIGHT PERFORATE SIDE WALLS; PERFORATE UPWARDLY CONVERGING UPPER PANELS ON THE UPPER ENDS OF SAID SIDE WALLS; AND PERFORATE DOWNWARDLY CONVERGING BOTTOM PANELS ON THE LOWER ENDS OF SAID SIDE WALLS, AN OUTER CAGE EXTENDING BETWEEN SAID END WALL MEANS AND INCLUDING UPRIGHT PERFORATE SIDE WALLS AND PERFORATE DOWNWARDLY CONVERGING BOTTOM PANELS RESPECTIVELY SPACED FROM THE SIDE WALLS AND BOTTOM PANELS OF THE INNER CAGE TO DEFINE A GRAIN PASSAGE THEREBETWEEN, MEANS INCLUDING IMPERFORATE OUTER WALL MEANS SPACED LATERALLY OUTWARDLY FROM EACH OF SAID SIDEWALLS OF SAID OUTER CAGE AND SEALED TO SAID END WALL MEANS AND TO SAID SIDE WALLS OF THE OUTER CAGE ADJACENT THE UPPER AND LOWER ENDS OF THE LATTER DEFINING AN AIR PLENUM CHAMBER ALONG THE OUTSIDE OF EACH OF SAID SIDE WALLS OF SAID OUTER CAGE, SAID INNER CAGE HAVING A LOWER PARTITION EXTENDING THEREACROSS ADJACENT THE LOWER ENDS OF ITS SIDE WALLS AND AN UPPER PARTITION EXTENDING THEREACROSS INTERMEDIATE THE ENDS OF ITS WALLS SEPARATING THE INNER CAGE INTO A LOWER AIR INTAKE COMPARTMENT BELOW THE LOWER PARTITION; AN INTERMEDIATE COMPARTMENT BETWEEN THE LOWER AND UPPER PARTITIONS; AND AN UPPER COMPARTMENT ABOVE THE UPPER PARTITION, AIR HEATER MEANS, BLOWER MEANS OPERATIVELY ASSOCIATED WITH SAID HEATER MEANS TO PASS AIR THEREOVER AND HAVING AN AIR INLET COMMUNICATING WITH SAID LOWER COMPARTMENT TO DRAW AIR INTO THE LOWER COMPARTMENT THROUGH THE GRAIN PASSAGES BETWEEN THE BOTTOM PANELS OF THE INNER AND OUTER CAGES AND AN OUTLET COMMUNICATING WITH SAID INTERMEDIATE COMPARTMENT TO DISCHARGE AIR INTO THE INTERMEDIATE COMPARTMENT FOR PASSAGE OUTWARDLY THROUGH THE GRAIN PASSAGES BETWEEN THE SIDE WALLS OF THE INNER AND OUTER CAGES IN THE REGION BELOW THE UPPER PARTITION INTO SAID PLENUM CHAMBERS, SAID PLENUM CHAMBERS DIRECTING THE HEATED AIR BACK THROUGH THE GRAIN PASSAGES BETWEEN THE SIDE WALLS OF THE INNER AND OUTER CAGES INTO THE UPPER COMPARTMENT FOR FLOW THERETHROUGH AND OUT THROUGH THE UPPER PANELS OF THE INNER CAGE, MEANS ADJACENT THE UPPER END OF THE INNER CAGE FOR FEEDING GRAIN TO SAID UPPER PANELS, AND MEANS ADJACENT THE LOWER END OF THE OUTER CAGE DEFINING A GRAIN OUTLET.