| 摘要 |
PURPOSE:To prevent the emission of squeaking noises upon cap opening and closing and improve its handling efficiency, by providing an outer cap with a cover portion and a thin-wall annularly-shaped latch portion and providing a plurality of interengageable recesses and projections between said cover portion and said latch portion serving as a rotation stopper. CONSTITUTION:An outer cap 2 is composed of a cover portion 2a having a handle portion and a thin-wall annularly-shaped latch portion 2b fitted into the interior thereof. The latch portion 2b is provided around its annularly-shaped periphery with locking recesses 4 in each of which a ratchet 7 is formed for engagement with a projection 9 of an inner cap 1 and with guide fins 5 extending upwardly beyond the latch portion and the locking recesses 4 are engaged with locking projections 3 provided in the cover portion 2a, thereby acting as a film rotation stopper. This provides a highly mechanical strength upon cap handling in refueling, making a smooth refueling operation possible with reduced wear and no squeaking noises.
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