| 摘要 |
PROBLEM TO BE SOLVED: To suppress loosening of screw parts of a container and a lid of a beverage container regardless of presence or absence of a lock mechanism.SOLUTION: By shape of screw threads 9, 10 of screw parts 5, 8 of a container 1 and a lid 2, loosening of the screw parts is suppressed. In other words, in pressure side flanks 12, 13 of the screw threads 9, 10, a lead angle of lower position side contacting parts 14, 15 which contact the other screw threads 10, 9 at the lowest height in a state where screw-in is performed completely is configured smaller than residual parts 16a, 16b, 17. Thereby, loosening rotation of the screw parts 5, 8 due to internal pressure increasing when hot water is filled in the container 1 is prevented. |
