Burner throat

Claim 1

IN A COMBUSTION APPARATUS INCLUDING A COMBUSTION CHAMBER HAVING ONE WALL PROVIDED WITH A CIRCULAR INLET OPENING AND A CONCENTRICALLY POSITIONED NOZZLE EXTENDING FROM THE OUTER SIDE OF SAID WALL FOR THE INJECTION OF FUEL THROUGH SAID CIRCULAR OPENING, AN IMPROVED THROAT CONSTRUCTION COMPRISING A PLURALITY OF INTERFITTING SEGMENTS UNITED TO FORM A VENTURI THROAT EXTENDING RADIALLY INWARDLY FROM THE PERIPHERY OF SAID CIRCULAR OPENING, EACH OF SAID SEGMENTS BEIONG OF RELATIVELY THIN-WALLED CONSTRUCTION DEFINED BY TWO OUTER, CIRCUMFERENCEFORMING EDGES, SLOPING INWARDLY TO FORM THE VENTURI CONSTRICTION IN THE ASSEMBLED THROAT, ONE OF SAID CIRCUMFERENCE-FORMING EDGES BEING ADJACENT THE OUTER SIDE OF SAID WALL AND THE OTHER OF SAIAD CIRCUMFERENCEFORMING EDGES BEING ADJACENT THE INNER SIDE OF SAID WALL, A METAL RING CIRCUMFERENTIALLY HELD ON THE OUTER SIDE OF SAID WALL WITH THE INTERIOR PORTION OF THE RING EXTENDING RADIALLY WITHIN SAID CIRCULAR OPENING, SAID METAL RIONG HAVING AN INTERIOR SHOULDER PORTION ADAPTED TO EMBRACE THAT CIRCUMFERENCE-FORMING EDGE OF THE COMPOSITE SEGMENTS WHICH IS ADJACENT THE OUTER SIDE OF SAID WALLS, SAID METAL RING ALSO HAVING A FLANGE PORTION EMBRACING A SUBSTANTIAL PORTION OF THE OUTER CIRCUMFERENTIAL SURFACE OF THE COMPOSITE SEGMENTS WHICH IS ADJACENT THE OUTER SIDE OF SAID WALLS, THE CIRCUMFERENCE-FORMING EDGES OF THE COMPOSITE SEGMENTS WHICH ARE ADJACENT THE INNER SIDE OF SAID WALL BEING CONSTRUCTED TO CONTACT SAID WALL AT THE INNER EDGE OF SAID CIRCULAR OPENING WHEREBY THE DEFINE A HOLLOW REGION BETWEEN THE SURFACE OF THE OPENING IN SAID WALL AND THE OUTER CIRCUMFERENTIAL SURFACE OF THE COMPOSITE INTERFITTING SEGMENTS.