| 摘要 |
PURPOSE: To make a correct judgement of a suitable fastening position by setting up a projection in a butt joint surface of a cap nut and a connecting part in a butt joint surface of a jaw part. CONSTITUTION: A projection 23 is formed in a butt joint surface 22 of the cap nut 2, a connecting part 11 is dented in the butt joint surface 12 of a jaw part 10 for receiving the projection 23 while the butt joint surface 22 of the cap nut 2 moves to the jaw part 10 by fastening the cap nut 12. By this structure, the contact with each other or separation from each other of the projection 23 and the connecting part 11 can be sensed by the operator through obvious changing of resistance against the fastening until a desirable seal condition is obtained while the butt joint surface 22 of the cap nut 2 is related with the butt joint surface 12 of the jaw part 10. Therefore, a final suitable fastening position may correctly be judged. |
