| 摘要 |
<p>PROBLEM TO BE SOLVED: To make a stopper body such as an inside stopper, which is set into a bottle mouth, easily removable, and also minimize strength reduction without causing any hindrance in forming a spiral line. SOLUTION: This bottle mouth forms a vertical groove 5 extending downward from an annular groove 3, in which an annular protruding line of a stopper body beneath a bottle mouth lip part 2 is fitted, and having its groove bottom positioned substantially at the same plane as a lower portion of the annular groove 3. In this bottle mouth, a slant face 4 above the annular groove 3 assumes an angleθ1 of 30-50 degrees with respect to a horizontal level. The widthθ2 of the vertical groove 5, which is expressed in terms of a spreading angle from the center of the bottle mouth, is put into 30-80 degrees. Since the angle 61 is set in an appropriate range, the strength of joining the stopper body to the bottle mouth becomes suitable. As a result, when the stopper body is removed from the bottle, the stopper body becomes moderately easy to come off the bottle, and there is also little possibility of the occurrence of such a trouble that the stopper body is carelessly detached from the bottle. Further, since the width 62 of the vertical groove is set in an appropriate range, the formation of a spiral line on the bottle mouth causes no hindrance, and strength reduction can also be minimized.</p> |
