| 摘要 |
In a cap device for a fuel tank, a main portion includes an operation portion, a sealing member and an engaging portion. When the main portion is inserted into an opening portion of the fuel tank and rotated by a predetermined angle, the sealing member is pressed against the opening portion and the engaging portion engages the opening portion, thereby fixing the cap device to the opening portion. The main portion also includes a shaft portion, a movable member having the engaging portion, and a cam mechanism disposed between the shaft portion and the movable member for allowing the shaft port ion to move separately from the movable member, so that the engaging portion engages the opening portion according to the vertical movement of the shaft portion through the cam mechanism.
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