| 摘要 |
The device comprises two hollow elements (3, 5) which are interpenetrating and axially slidable with respect to each other, forming a compartment (7) within which is placed a spring (9) which reacts to the axial sliding; each of said two elements (3, 5) has one end formed into a hook (3A, 5A) and the other end formed into a tab to form a base (38, 5B) on which the spring reacts by compression (9); when the two elements (3, 5) are joined together, each has its hook end (3A, 5A) closed against the base (3B, 5B) of the other element by the action of the spring (9). <IMAGE>
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