| 摘要 |
PURPOSE: To prevent an internal plug from separating from a lid body when the lid body is removed from the mouth part of a container by a method wherein a fitting part of the internal plug and a fitting body of the lid body are fitted to make the combined state of the internal plug and lid body stronger. CONSTITUTION: An internal plug 1 which is formed into a disk form of a synthetic resin with elasticity has a fitting part (1a) at the center, and has a flange 4 facing downward with a fitting part (1b), which comes into contact with the internal surface 3a of a container mouth part 3 at a location being closer to the peripheral end, and a flange 5 facing outward which comes into contact with the upper end 3b of the container mouth part 3. Also, a lid body 2 has fitting bodies 2a, 2b at the center and at a location being closer to the peripheral end, and at the same time, has a threaded part 2d which is screwed with a threaded part 3c of the container mouth part 3, on the internal surface. The fitting parts (1a), (1b) of the internal plug 1, and the fitting bodies 2a, 2b of the lid body 2 are fitted respectively, and at the same time, by screwing the lid body 2 into the container mouth part 3 under a state wherein a peripheral edge 5a of the flange 5 facing outward of the internal plug 1 is engaged with an engaging part 2c of the lid body 2, the internal plug 1 and lid body 2 are firmly combined. |
