| 摘要 |
PROBLEM TO BE SOLVED: To provide a square bottle of which buckling of a shank can be suppressed.SOLUTION: A square bolt is characterized in that a mouth 11, a shoulder 12, a shank 13 and a bottom 14 are integrally formed from a synthetic resin material, the shank 13 is constituted in such a manner that a main wall part 21 and a corner wall part 22 are alternately continuously provided in a circumferential direction around a bottle axis O, the main wall part 21 is provided with a panel part 23 which is depressed towards an inner side in a radial direction orthogonal to the bottle axis O in a plan view from the bottle axis O direction, the panel part 23 is defined by a panel bottom wall part 31 positioned on an inner side in the radial direction and a side wall part 32 which is extended to an outer side in a radial direction from an outer peripheral edge of the panel bottom wall part 31, and a protrusion 42, which projects towards the outer side in the radial direction, is formed at a connection part between a vertical side wall portion 32a of the side wall part 32 and the panel bottom wall part 31.SELECTED DRAWING: Figure 1 |
