| 摘要 |
<p>An elastic arm part (14) is provided on an outer periphery of a cylinder part (11) of a cap (1), and a projection (25)is formed in an outer periphery of an opening part (20). When the cap (1) is loosened, the arm part (14) engages the projection and is elastically deformed and after releasing the engagement of the arm part (14) and the projection (25), an engagement between a first screw part (12) and a second screw part (24)is released. Even if an engaging distance between a first screw part (12) and a second screw part (24) is short, the cap (1)is prevented from rapidly opening, and it is possible to lengthen a time a fuel steam is slowly discharged from the opening part. <IMAGE> <IMAGE> <IMAGE></p> |
