| 摘要 |
A device for securing a plug, of the type involving a piston (9) propelled by gas, has a combustion chamber (5) delimited on one side by the piston and on the other side by a cylinder head (7) with a duct (19) for injecting combustible gas open via one end (19A) into the chamber. The duct (19) has an orifice for creating a pressure drop between the part of the duct (19) upstream of the end (19A) and the chamber (5) itself, so as to at least partially avoid the vaporizing of the combustible gas in the part of the duct upstream of the end.
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