| 摘要 |
An igniter plug has a tubular metallic shell and an annular ground electrode each connected in series by an interfitting, and fixed by welding. The igniter plug further has a tubular insulator placed within both the metallic shell and the ground electrode, while a center electrode is placed within the insulator to be surrounded by the ground electrode. A plurality of lock arms are provided with a front end of the metallic shell, and each top end of lock arms has a pawl which is brought into an engagement with an inner wall of a groove which is provided with an inner surface of the ground electrode when the metallic shell and the ground electrode are connected, and at the same time, the insulator is brought into an engagement with an inner side of each lock arm to deter the lock arms from being flexed inwardly when the insulator is placed.
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