| 摘要 |
A container and screw cap closure are presented in which the cap, once installed, cannot be removed without so damaging its external rim that the damage will be visible and evident to anyone using the container and cap thereafter. In this way, a user can immediately detect any tampering with the closure with possible substitution, adulteration or contamination of the container's contents. When the user himself opens the closure cap, the cap will be damaged but the damage will not interfere with subsequent effective use of the cap to close the container. A series of one-way steps in the rim cooperate with a pair of stops on the container to permit rotation of the cap without damage as it is applied to the container but to cause tearing and other visible damage to the cap upon counter rotation of it to effect removal.
|
