| 摘要 |
PCT No. PCT/SE84/00194 Sec. 371 Date Jan. 18, 1985 Sec. 102(e) Date Jan. 18, 1985 PCT Filed May 18, 1984 PCT Pub. No. WO84/04777 PCT Pub. Date Dec. 6, 1984.A safety arrangement in a so-called gas-cutting lance (1) arranged to be connected at one end (2) thereof, the attachment end, to a gas-supply handle (3) or like means for causing gas, primarily oxygen gas, to flow through the lance. The lance comprises a hollow tube (5) which preferably houses a core (6) of, for example, closely packed filaments (7). The tube and the core comprise a material having a high iron content and are intended to melt progressively at the free end of the lance and to burn, to oxidize, at least in part. The arrangement is characterized in that preferably at least the lance (1) includes at least one substantially tubular sleeve (8,9) or like member in the vicinity of the attachment end (2) of the lance. The lance in the aforesaid vicinity of the attachment end (2) is devoid of any core material, and each sleeve (8,9) is made of a material which will arrest or prevent the melting and burning process, the arrangement being such that the lance (1) will be extinguished when the melting and burning process reaches the sleeve or sleeves (8,9). |
