| 摘要 |
PROBLEM TO BE SOLVED: To provide an inner plug of a fluid container in which a size of the middle plug itself can be made small to such a degree as one not to enable a finger tip to be inserted in response to a size of the content or an entire size of the container and then an opening required for extracting the content can be easily formed even if such a small inner plug is provided. SOLUTION: There is provided an inner plug 2 made of synthetic resin fitted to an opening 11 of a container 1 for fluid flowing down by its own weight. A bottom wall 21 of the middle plug 2 is comprised of a thin-walled section 23 for a non-annular opening sectioned by a non-thin walled section 22, and a recovering preventing protrusion 24 at a position near an inner diameter side of the thin-walled portion 23 and opposing against the non-thin wall portion 22 toward an outward direction. In addition, the inner plug 2 is comprised of a flange section 26 engaged with an upper end of the opening 11 of the container 1, a barrel 27 extending along an inner circumferential surface of the opening 11 of the container 1, and a bottom wall 21 cooperatively connected to its lower end and the protrusion 24 is positioned in a cavity (a) formed by the barrel 27 and the bottom section 1. |
