| 摘要 |
PROBLEM TO BE SOLVED: To provide an opening mechanism in which a cap can be fixed easily at a positive position and then the cap is not prevented from being removed. SOLUTION: This opening mechanism is comprised of a base end holding section and an extremity end cap engaging section. The cap engaging section is comprised of a top surface and three side walls suspended vertically from the top surface. In this case, the side walls are comprised of a first side wall at an extremity end having an abutting claw to be abutted against a lower side wall of a cap, a second side wall at a base end having an engaging claw to be engaged with the lower end of the cap so as to hold the cap between it and the top surface, and a third side wall abutted against the lower side wall of the cap and having the abutting claw to cause the cap to be positioned at the central part of the cap engaging section.
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