| 摘要 |
A cap made of synthetic resin coming into mesh with a mouth of a container is provided, wherein the cap comprises a tubular member made of synthetic resin, a ring provided integrally with a lower end of the tubular member through easily frangible joint pieces, a multiplicity of engagement members formed to extend obliquely upward from an inner lower end of the ring and to have a uniform thickness as a whole, the engagement members being each inclined along both sides thereof so as to spread toward their upper end and project radially inward to have an arc-shaped bulged portion, junctions at which opposite upper side ends of the adjacent engagement members are integrally connected to each other, and thin films formed to cover areas defined by the ring and the adjacent engagement members, and the container has a mouth provided with a screw-shaped groove cooperating with the cap and an annular projection formed below the screw-shaped groove and engaging the engagement members. There is also provided a cap wherein opposite upper side ends of the adjacent members are not connected to each other, and wherein the thin films are formed to cover areas defined between the ring and the adjacent engagement members. An embrittled line is formed to extend vertically across the ring, the engagement member, and/or the thin film.
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