Importance

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Abstract

A combination vessel is capable of carrying out temporary fastening while always bringing down a ring portion subsequently to breakage of a bridge part during an opening operation. A cap portion and a ring portion of a cap type sealing tool are coupled to each other through a bridge part. Through breakage of the bridge part during opening of the cap portion, the ring portion is pulled down while a sliding protrusion on an internal wall in a lower stage area of the ring portion always contacts by pressure an upward spread zone on an external wall of a neck zone of a bottle portion. In addition, vertical convexities to block an opening turn of the cap portion provided on an inner periphery of the ring portion, and vertical convexities to block the opening turn provided on an external wall of a neck zone of the bottle portion, do not prevent attachment of the cap type sealing tool, but do prevent accompanied rotation of the ring portion during the opening of the cap portion to thereby allow breaking of the bridge part. At least one higher vertical convexity is provided as one of the vertical convexities provided on the inner periphery of the ring portion. Consequently, it is possible to prevent the ring portion from an erratic opening. Furthermore, the bridge part is not broken during temporary mounting of the cap type sealing tool and a subsequent opening thereof.

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First Claim