| 摘要 |
A container for storing a hazardous product, a lock ring assembled into a neck groove portion of the container and a safety closure threaded over the container to seal the container and encircle the lock ring. An extending tab, on the bottom of the lock ring, is exposed and manually held stationary during the closure removal procedure. The neck groove portion and a mating inside peripheral wall of the lock ring both have equal axis offsets from a central axis of the mating threads on the closure and the container. These offset axes are positioned in alignment to permit closure removal when the extending tab of the lock ring is in contact with an alignment shoulder in the neck groove portion of the container. Serrations on the outside serrated surface of the lock ring and the inside serrated surface of the closure are concentric with the threads on the closure and the container when the offset axes are in alignment. The serrations grip lock together when the offset axes go out of alignment which occurs when the closure removal is attempted improperly. The proper procedure of holding the extending tab stationary to maintain its alignment position against the alignment shoulder of the neck groove portion of the container will allow unthreading and removal of the closure.
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