| 摘要 |
A sealing stopper comprising a stopper having a bottom portion, and a substantially transverse recess formed from the side of the bottom portion, a limiting stop secured to the stopper and disposed in the recess, and a bearing ball movably disposed in the recess. The recess has a depth adjacent the stop at least equal to the diameter of the bearing ball and the recess includes ends remote from the stop having a depth less than the diameter of the bearing ball, whereby the stop limits the path of the ball in the recess so that the bearing ball permits the stopper to turn freely in a closing direction, the ball remaining resting against the stop, and subsequently when turning the stopper in the opposite direction of opening, the ball is moved towards the remote end and becomes wedged between the stopper and the thread of a cap of a container in which the stopper is adapted to be inserted, destroying the cap and making the container useless.
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