| 摘要 |
A manual gas cutting torch to be used for fusioncutting such materials as steel frames or iron plates is described. The torch has a flame port at its tip (cutting tip), connection ports for gas and oxygen cylinders at the rear and, in the middle, a handle portion for holding the torch. A freely detachable back-fire prevention device is incorporated within the gas channel or oxygen channel or both channels at a downstream side of the handle portion. The back-fire prevention device serves to stop the flash-back from the cutting tip just prior to the handle section for preventing the flame from passing through the handle section and escaping back to the cylinder. |
