| 摘要 |
A closure apparatus comprises a collar 2 having a collar periphery and having a collar inner surface defining an opening 3, a closure 10, having a closure periphery, said closure 10 being for closing said opening 3, a bearing structure 7 being located around said collar periphery or said closure periphery, a locking ring 18 being mounted for rotation with respect to said closure 10 and said opening 3 on said bearing structure 7, so that said locking ring 18 is rotatable between a locking position for locking said closure 10 to said opening 3 and an unlocked position for permitting said closure 10 to be moved away from said opening 3.
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