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Claim 1

APPARATUS FOR SCRAPING A SURFACE, COMPRISING A BURNER UNIT HAVING AN OPEN END PROVIDING A LONGITUDINALLY PROJECTING FLAME AND A CLOSED END HAVING A PLURALITY OF AIR MIXING PASSAGEWAYS THEREIN AND RIGIDLY CONNECTED TO A RIGID FUEL SUPPLY CONDUIT, A SHEET METAL SCRAPER BLADE HAVING A SCRAPING EDGE GENERALLY TRANSVERSE TO THE AXIS OF SAID BURNER AND SIDE EDGES EXTENDING GENERALLY LONGITUDINALLY OF SAID BURNER, MEANS FIXEDLY SECURING SAID BLADE RELATIVE TO SAID BURNER AND CONDUIT IN POSITION PROJECTING LONGITUDINALLY BEYOND THE OPEN END OF SAID BURNER AND DIVERGING LATERALLY AWAY FROM THE LONGITUDINAL AXIS OF SAID BURNER IN THE DIRECTION OF FLAME EXTENSION, A FLAME SPREADER RIGIDLY SECURED RELATIVE TO SAID BURNER ON THE SIDE THEREOF OPPOSITE SAID BLADE, SAID SPREADER COMPRISING A DEFLECTING SURFACE PROJECTING BEYOND THE BURNER AND EXTENDING AT LEAST PARTIALLY ACROSS THE OPEN END OF SAID BURNER TO DEFLECT THE FLAME THEREOF LATERALLY TOWARD SAID BLADE ADJACENT SAID SCRAPING EDGE, SAID FLAME SPREADER HAVING SIDEWALLS EXTENDING TOWARD THE SIDE EDGES OF SAID BLADE AND ACTING TO GENERALLY ENCLOSE SAID BURNER, SAID BLADE HAVING A TANG STRUCK UPWARDLY THEREFROM TOWARD SAID SPREADER AND HAVING AN APERTURE SURROUNDING SAID BURNER AND SAID MEANS FIXEDLY SECURING SAID BLADE COMPRISING A SECOND TANG STRUCK UPWARDLY LATERALLY FROM THE BLADE AT A POINT SPACED LONGITUDINALLY FROM SAID FIRST TANG AND RIGIDLY SECURED TO SAID CONDUIT, SAID BLADE, SPREADER, AND FIRST TAND SERVING TO PROVIDE A CONFINED FLAME AREA HEATING THE EDGE OF SAID BLADE AND THE SURFACE ADJACENT THERETO AHEAD OF SAID FIRST TANG.