| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a stopper that is neither removed nor sprung out even if an inner pressure of container is rapidly increased, and enables its opening work to be easily carried out. <P>SOLUTION: Provided is a synthetic resin stopper 1 comprising an inner cylinder 5 vertically installed at a top wall 3 and inserted into and fitted to the inside part a container opening part and an outer cylinder 7 vertically installed at the top wall 3 in a concentric manner with the inner cylinder 5 to cover the outside part of the container opening part, wherein the outer cylinder 7 comprises a cut-out part 17 cut out and removed from the stopper 1 and a residual part 19 having an engaging part 23 engaged with an engaging part of the container opening part and left while being not cut out. The inner cylinder 5 is provided with an upper annular protrusion 11 and a lower annular protrusion 13 axially spaced apart at its outer peripheral surface, and the lower annular protrusion 13 is provided with at least one cut-away part 15. <P>COPYRIGHT: (C)2009,JPO&INPIT |
