Pneumatic conveyor for pulverant materials

Claim 1

IN A PNEUMATIC CONVEYING SYSTEM, THE COMBINATION COMPRISING A PRESSURE VESSEL FOR CONTAINING BULK MATERIAL TO BE CONVEYED; SAID VESSEL INCLUDING AN AIR PERVIOUS BOTTOM CLOSURE ADAPTED TO BE CONNECTED TO AN AIR PRESSURE SOURCE AND THROUGH WHICH AIR CAN BE INTRODUCED THROUGH THE BOTTOM OF SAID VESSEL TO FLUIDIZE SAID BULK MATERIAL IN SAID VESSEL; A CONVEYOR CONDUIT FOR CONVEYING MATERIAL FROM INTERIORLY OF SAID VESSEL AND DISPOSED WITH ITS INLET OPENING IN SAID VESSEL AND ADJACENT TO SAID PERVIOUS BOTTOM CLOSURE; AND AIR FEED-BACK PIPE IN SAID PRESSURE VESSEL HAVING ITS INTAKE END IN COMMUNICATION WITH SPACE WITHIN SAID VESSEL ABOVE THE LEVEL OF MATERIAL CONTAINED THEREIN AND DISPOSED WITH ITS DISCHARGE END ADJACENT AND IN SUBSTANTIAL AIR FLOW REGISTRY WITH THE INLET OPENING OF SAID CONVEYOR CONDUIT; SAID FEED-BACK PIPE INCLUDING A FLEXIBLE HOSE SECTION BETWEEN SAID INLET AND DISCHARGE ENDS DEFINING A FLEXIBLE JOINT ABOUT WHICH SAID DISCHARGE END OF SAID PIPE MAY BE SWUNG RELATIVELY TOWARD AND AWAY FROM SAID INLET OPENING; AND CONTROL MEANS CONNECTED TO SAID DISCHARGE END AND EXTENDING EXTERNALLY OF SAID VESSEL OPERABLE TO MOVE SAID DISCHARGE END RELATIVE TO SAID INLET OPENING TO ADJUSTABLY ENLARGE OR NARROW THE SPACE BETWEEN THE DISCHARGE END AND INLET OPENING; THE SPACE BETWEEN SAID DISCHARGE END AND INLET OPENING DEFINING A PASSAGE BY WHICH BULK MATERIAL IN THE VESSEL IS INTRODUCED INTO SAID INLET OPENING.