Spray gun having means to control heat concentration in metal substrate

Claim 1

APPARATUS FOR APPLYING A FUSED POWDER COATING TO A METAL SURFACE INCLUDING IN COMBINATION A TORCH THAT DELIVERS A PILOT FLAME TOWARD THE SURFACE OF A WORKPIECE TO BE COATED, MEANS DIRECTING AN ELECTRIC ARC ALONG THE IONIZED PATH PROVIDED BY THE PILOT FLAME, MEANS FOR INTRODUCING A SUPPLY OF POWDERED COATING MATERIAL INOT THE PILOT FLAME IN POSITION TO BE FUSED BY THE PILOT FLAME AND ARC, SAID PILOT FLAME AND ARC BEING CONCENTRATED ON A SMALL AREA OF THE WORKPIECE TO PRODUCE INTENSE SKIN HEATING OF THE WORKPIECE AT THAT AREA, AND MEANS LOCATED AT THE END OF THE TORCH AND ALONG THE PATH OF THE PILOT FLAME AS IT TRAVELS TOWARD THE WORKPIECE, SAID LAST RECITED MEANS BEING OPERABLE FOR PROGRESSIBELY CHANGING THE PATH OF THE PILOT FLAME WITH RESPECT TO THE TORCH SO AS TO STRIKE THE WORKPIECE AT DIFFERENT AREAS.