| 摘要 |
PURPOSE: To prevent a bottle opening port from being closed unless a pull-top handle is pulled with a hand by a method wherein a fixing protrusion protruded downwardly at a lower end of a side surface is integrally formed between a plurality of cut-portions formed at the side surface, the pull-top handle is pushed downwardly to cause the engaging piece of the pull-top handle to be engaged with the lower end of the fixed protrusion formed at the side surface and fixed there. CONSTITUTION: A synthetic resin bottle cap 1 has a disk-like upper surface 2 and a side surface 3 formed into a ring-shape while being crossed at a right angle around a circumference of the upper surface 2, and a cut-away portion 5 is formed from the side surface 3 to the upper surface 2 in a Ω shape. Then, the pull-top is integrally formed at the lower end of the side surface 3. A fixed protrusion 10 having a protrusion 11 protruded downwardly from the lower end of the side surface 3 and having its upper surface formed into a curved surface is integrally formed. Then, the central part of a folding part 12 of the pull-top is formed with a space part 16 and an engaging piece 14 into which the fixed protrusion 10 is inserted. The space part 16 through which the fixed protrusion 10 can be inserted is arranged at the intermediate part of the engaging piece 14. A pressing protrusion 13 is protruded and formed at the terminal end of the engaging piece 14. |
