Device for heating compressed air, particularly for heat bonding purposes in folding box machines

Claim 1

DEVICE FOR ELECTRICALLY HEATING COMPRESSED AIR, THE DEVICE COMPRISING A PAIR OF SUBSTANTIALLY CONCENTRICALLY DISPOSED SPACED METAL TUBES, ON INSIDE THE OTHER, FORMING AN OUTER AIR CHAMBER BETWEEN THEM, ONE END OF THE OUTER TUBE BEING CLOSED AND SECURED TO THE INNER TUBE, A PORTION OF WHICH PROJECTS BEYOND THE SAID ONE END OF THE OUTER TUBE, AND OUTLET PASSAGE BEING PROVIDED IN THE PROJECTING PORTION, SAID OUTER PASSAGE HAVING A DISCHARGE NOZZLE CONNECTED THERETO, THERE BEING AN AIR INLET PASSAGE IN THE WALL OF THE OUTER TUBE ADJACENT SAID ONE END AND A TRANSFER PASSAGE IN THE WALL OF THE INNER TUBE ADJACENT THE OTHER END OF THE OUTER TUBE FOR PASSAGE OF AIR FROM SAID OUTER AIR CHAMBER TO THE INTERIOR OF THE INNER TUBE, SAID OUTER END HAVING A TERMINAL FLANGE CONNECTED THERETO, SAID INNER TUBE EXTENDING BEYOND SAID TERMINAL FLANGE, AN ASSEMBLY OF STACKED DISCS ON SAID TERMINAL FLANGE, THE DISC IMMEDIATELY ADJACENT THE FLANGE HAVING AN APERTURE THERETHROUGH IN WHICH SAID INNER TUBE IS SEATED, THE OUTERMOST DISC HAVING A SMALLER APERTURE THERETHROUGH; A SEALING PLUG IN SAID ASSEMBLY; CENTRALLY APERTURED MEANS FOR CLOSING THE PROJECTING PORTION OF THE INNER TUBE; A SEALING PLUG IN SAID APERTURED MEANS; AND A HEATER ELEMENT IN THE FORM OF A CARBONACEOUS ROD EXTENDING THROUGH THE SEALING PLUGS AT BOTH ENDS OF THE CHAMBER FORMED BY THE INNER TUBE.