| 摘要 |
PROBLEM TO BE SOLVED: To provide a cap which can reduce rotary force of a lid required for breaking a weakened part.SOLUTION: A cap 1 comprises: an inside plug 4 attached to a container 2; and a rotatable lid 5. The inside plug 4 comprises a detachment member 12 whose surrounding is surrounded by a weakened part 11 which can be broken. When a lid 5 is rotated in an opening direction in an unused state, rotary force of the lid 5 is transmitted to the detachment member 12 thereby the weakened part 11 is broken, and the detachment member 12 is detached from the inside plug 4, and a bung hole is formed on the inside plug 4. When the lid 5 is rotated in the opening direction, stress is centralized to a part of the weakened part 11 in a peripheral length direction.SELECTED DRAWING: Figure 2 |
