| 摘要 |
A container lid is composed of a synthetic resin inside plug to be mounted on the mouth of a container, and a synthetic resin lid to be mounted on the inside plug. A breakable thin-walled line formed in a closing wall has an outer arcuate portion extending from a breakage start end portion, and an inner arcuate portion extending from the breakage start end portion, and defines an arcuate deformation region. A locked element is annexed to the deformation region, and a locking element is in the lid. When the lid is rotated in a predetermined direction, the locking element is locked to the locked element. When the lid is rotated further in the predetermined direction, a force is exerted on the deformation region via the locking element and the locked element, so that the breakable thin-walled line of the inside plug is broken and the deformation region is deformed. |
| 主权项 |
1. A container lid comprising a synthetic resin inside plug to be mounted on a mouth neck of a container, and a synthetic resin lid body to be mounted on the inside plug,
wherein the inside plug includes a circular closing wall, and a cylindrical mounting wall connected to an outer peripheral edge of the closing wall, and the mounting wall is fitted to an outer peripheral surface of the mouth neck of the container, whereby the inside plug is mounted on the mouth neck of the container, and the closing wall closes the mouth neck of the container, the lid body includes a circular covering wall, and a cylindrical fitting wall connected to an outer peripheral edge of the covering wall, and the fitting wall is fitted to an outer peripheral surface of the mounting wall of the inside plug, whereby the lid body is rotatably mounted on the inside plug, and the covering wall is located above the closing wall of the inside plug, at least one breakable thin-walled line is formed in the closing wall of the inside plug, the breakable thin-walled line has an outer arcuate portion extending from a breakage start end portion, and an inner arcuate portion extending from the breakage start end portion, and an arcuate deformation region is defined between the outer arcuate portion and the inner arcuate portion, locked means is annexed to the deformation region, at least one discharge opening is formed in the covering wall of the lid body, and locking means collaborating with the locked means is disposed on a lower surface of the covering wall, with the lid body being mounted on the inside plug, the locking means is located upstream of the locked means as viewed in a predetermined direction; when the lid body is rotated in the predetermined direction relative to the inside plug, the locking means is locked to the locked means; and when the lid body is rotated further in the predetermined direction relative to the inside plug, a force is exerted on the deformation region via the locking means and the locked means, so that the breakable thin-walled line of the inside plug is broken and the deformation region is deformed, whereby a pass-through opening is formed in the closing wall of the inside plug. |
