| 摘要 |
A multiple secured coupling device for oxygen lances 1 is achieved in that both the male connector 8 of the safety pipe 3, the connection part 18 of the lance holder 2 and also the cap nut 9 have an extending safety piece 10, 11. In this way, the male connector 8 can be inserted very far into the female part 19 or the connection part 18 and then located in position using the cap nut 9. A total of five sealing zones are created that in particular effectively prevent the escape of highly flammable gases, in particular oxygen.
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