Heating means for deep fat fryer

Claim 1

IN A DEVICE OF THE TYPE DESCRIBED: (A) A DEEP WELL FRYER ADAPTED TO HOLD GREASE FOR FRYING PURPOSES; (B) A GREASE-HEATING TUBE EXTENDING THROUGH SAID WELL AND BEING OPEN AT BOTH ENDS; (C) A HEATING CARTRIDGE OF SMALLER DIAMETER THAN THAT OF SAID TUBE AND HAVING TWO OUTWARDLY EXTENDING ANNULAR FLANGES ADAPTED TO CONTACT WITH THE INNER CYLINDRICAL SURFACE OF SAID TUBE ADJACENT TO THE ENDS THEREOF FOR SPACING THE CARTRIDGE WALL FROM THE TUBE WALL AND PROVIDING AN ANNULAR AIR SPACE BETWEEN THE TWO WALLS THAT EXTENDS SUBSTANTIALLY THROUGHOUT THE LENGTH OF SAID TUBE; (D) SAID CARTRIDGE WALL HAVING LONGITUDINALLY EXTENDING ROWS OF OPENINGS THEREIN FOR PERMITTING THE HOT GASES OF COMBUSTION TO PASS FROM THE CARTRIDGE INTERIOR INTO SAID ANNULAR AIR SPACE; (E) MEANS FOR DIRECTING A GAS FLAME INTO SAID CARTRIDGE INTERIOR FROM ONE END THEREOF; AND (F) SAID CARTRIDGE WALL HAVING INWARDLY EXTENDING LIPS, ONE FOR EACH OPENING IN THE ROWS OF OPENINGS, EACH LIP BEING DISPOSED ADJACENT TO THE PORTION OF ITS ASSOCIATE OPENING THAT IS POSITIONED NEAREST TO THE ENTRANCE OF THE GAS FLAME; (G) WHEREBY SAID LIPS WILL DEFLECT LATERALLY WITHIN SAID CARTRIDGE THE FLOW OF GASES OF COMBUSTION STRIKING THE LIPS FOR PREVENTING ANY PORTION OF THE GAS FLAME FROM PASSING THROUGH SAID OPENINGS AND STRIKING SAID TUBE WALL WHILE PERMITTING THE HEATED GASES TO PASS INTO SAID ANNULAR AIR SPACE FOR HEATING IT AND SAID TUBE WALL; THE ANNULAR FLANGE FARTHEST REMOVED FROM THE GAS FLAME HAVING PASSAGES THEREIN FOR THE FLOW OF GASES AND AIR THERETHROUGH.