| 摘要 |
Disclosed herein is double cap having a lower cap rotatably connected to an upper cap. The lower cap has an insertion pipe body defining an adjunct receiving chamber therein. The insertion pipe body has a bottom opening covered by a bottom cover. A plurality of rib protrusions is provided on an inner surface of the insertion pipe body. First and second steps are formed on an upper end of the lower cap and stepped downward from an upper end of the adjunct receiving chamber. A push member, having a push pipe body is received in the adjunct receiving chamber of the lower cap, with a plurality of guide protrusions formed on the exterior of the push pipe body, so that the rib protrusions of the lower cap are guided by the guide protrusions to guide the upward and downward movement of the push member. External push threading is provided around a circumferential outer surface of the push member. The upper cap has internal threading provided for engagement with the external push threading formed on the push member to provide an upward and downward moving force for the push member relative to the direction of rotation of the upper cap, so that, when the upper cap is rotated in a predetermined direction, the push member moves downward to open the bottom cover.
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