| 摘要 |
PROBLEM TO BE SOLVED: To provide structures of a cap and a neck part facilitating classified wastes of a container body and the cap in the container body such as a PET bottle having a neck part having a cylindrical diameter and the cap sealing the neck part.SOLUTION: A cap structure comprises a base 22 mounted to a neck part 14 and a cap part 24. The cap part 24 comprises: a first projection part 24a projecting outside an outer periphery of a low end side; a second groove part 24b being positioned closer to an upper side than the first projection part 24a and sequentially formed from a first projection part 24a side across an entire outer periphery; and a third groove part 24c having a diameter less than that of the second groove part 24b. The base 22 comprises: a cam-shaped cam part 22a brought into slide contact with an upper part of the first projection part 24a and pushing up the base 22 in a direction of the cap part 24 when the cap part 24 is rotated in a circumferential direction; and a second projection part 22b sequentially fitted into the second groove part 24b and the third groove part 24c when the base 22 is pushed up in the direction of the cap part 24 at an outer periphery of the cap part 24.SELECTED DRAWING: Figure 3 |
