| 摘要 |
The invention is based on the provision on the outer member 2 of a body 4 which can be displaced axially through the action of a spring 5 and is retained in a position by a catch 10 on which the inner member 2 can act, releasing said body and leaving it free to then adopt a limit position defined by an end stop 15 on which a catch 10 mounted radially on said body secures the two members 1-2 locking them in a specific relative position. <IMAGE>
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