| 摘要 |
PURPOSE:To obtain a torch whose construction is simple and ignition performance is superior, by making use of both an inside and an outside ducts which constitute a tip as an electric conductor to a spark point of the apex of the tip. CONSTITUTION:A tip a consists of an inside duct 1 and an outside duct 2 of a two-tiered construction of the inside and the outside, and both the ducts 1 and 2 are constituted with a good electric conductor having copper for its main ingredient. An electric insulator 3 is interposed in about a whole area between the inside duct 1 and the outside duct 2 excluding a spark point S at the apex, and both the ducts 1 and 2 are insulated electrically each other. A cutting oxygen duct 4 and a combustible mixture gas duct 5 are formed in the inside duct 1 and the outside duct 2 of the tip a respectively, and connecting terminals 6 and 7 to a piezo-electric system c which is a spark ignition electric power source are formed on the rear edges of both the ducts 1 and 2. A spark is occurred at the point S for ignition, as a fuel gas duct 15, a preheating oxygen duct 16 and a cutting oxygen duct 17 are released, electromotive force is generated through a crash of a metal pad 21 of a piezo-electric body 18 against a terminal 6, and the other pole is connected with the outside duct 2 permanently through an inner duct 10, an outer duct 13 and a head b. |
