| 摘要 |
PROBLEM TO BE SOLVED: To increase friction between a synthetic resin cap and an outer wall of a bottle mouth to reinforce elastic contact force by providing an elastically deformable means which is in elastic contact with an outer wall part of the bottle mouth on the cap. SOLUTION: A synthetic resin cap 1 is equipped with a circular flange 14 on an outer wall of a bottle mouth, a fitting hole 8 to be fitted with an insertion piece 7 as an elastically deformable means of a seal ring 6 is provided at a lower end face of the cap 1, and the insertion piece 7 of the seal ring 6 is fitted and hooked with the fitting hole 8 for rigidly coupling both. The insertion piece 7 is divided into right and left protruding pieces 7b by a groove 7a at a center, which deform when inserted, wherein when a protrusion 7c of the right and left protruding pieces 7b is inserted into a hook recess 8a of the fitting hole 8, the insertion piece 7 returns to an original shape, so that the hook recess 8a and the protrusion 7c are engaged, and the cap 1 and the seal ring 6 are integrally fixed, thereby forming the cap 10 with a seal. |
