| 摘要 |
PROBLEM TO BE SOLVED: To prevent a threadably coupled state of a cap to an inside stopper from working loose and a gap therebetween from being caused, by unitarily forming a cylindrical pressure contact portion on an inner circumferential face of the inside stopper and a cylindrical pressure contact portion on an outer circumferential face thereof, whose diameters are made narrow when the inside stopper, which can be fitted to a mouth of a bottle body, and to which a cap is threadably coupled, is fitted to the mouth of the bottle body. SOLUTION: In an inside stopper 1 which is fitted to a mouth (a) of a bottle body A after the bottle body A is filled with contents, and to which a cap B is threadably coupled, an outer diameter of a pressure contact portion 3 on an inner circumferential face of the inside stopper 1 is made larger than an inner diameter of the mouth (a). Therefore, when the pressure contact portion 3 is inserted into the mouth (a) to be fitted to an inner circumferential face of the mouth (a) under pressure, the diameter of the pressure contact portion 3 is resiliently made narrow, and the pressure contact portion 3 is thereby brought into pressure contact with the inner face of the mouth (a). Further, at that time, a diameter of a pressure contact portion 5 on an outer circumferential face of the inside stopper 1 is also made slightly narrow following the narrowed diameter of the pressure contact portion 3 on the inner circumferential face, and the pressure contact portion 5 is brought into pressure contact with an out face of the mouth (a). Simultaneously, a locking protrusion 7 formed on the pressure contact portion 5 on the outer circumferential face is locked to a lower edge of a protrusion 6 formed at the mouth (a) so as to prevent the inside stopper 1 from coming off. Furthermore, the cap B is pressed against a threadably coupling part 8 following the narrowed diameter of the pressure contact portion 3 so as to prevent the cap B from working loose. |
