| 摘要 |
The invention contemplates safety-closure structure involving threaded engagement of cap and bottle-neck members, wherein coacting lug formations on the respective members have compliantly yieldable cammed latching engagement in approach to a fully-closed relation of the members and wherein, once in the fully-closed relation, a positive-lock relation prevents unthreading rotation of the members. The engaged threads are sized for a quantum of axial lost-motion, and resilient action of a seal which reacts axially between the members is operative to constantly load the cap member to its axially upper limit of the lost motion. The lug formations are of such axially limited extent that, when the members are in their fully-closed relation, an axial depression of the cap member through the lost motion and against the resilient seal action is necessary to free the positive-lock relation of the lugs formations, thus then permitting a thread-off rotary manipulation of the cap member.
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