| 摘要 |
The invention concerns a cap (4) designed to be associated with a container (2) neck (1) provided with an external thread (6) and an annular clip-on rim (8). The cap comprises, on an annular skirt (15), an internal thread (18) and an annular clip-on protuberance (24). Initially, the two threads (6, 18) are in incipient mutual engagement, the rim and the boss not being mutually clipped on, once the rim and the boss are mutually clipped on, the two threads (6, 18) are no longer engaged. Thus, the cap can be screwed onto the neck thread until the boss and the rim are mutually clipped, and the cap can no longer be unscrewed from the container neck, the threads being disengaged.
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