| 摘要 |
The device comprises: a main part (10) which includes a cup-shaped body (12) formed by a bottom wall (14) and by a side wall (16) which define inside them a cavity (18) which opens outwards, the inner surface of the side wall (16) having a first thread (20) and the outer surface of the bottom wall (15) having, protruding therefrom, a pin (26) having on its outer side surface a second thread (28) with a direction opposite to that of the first thread (20); a bush (32) having a tubular body (34) with a third thread (36) on its outer surface and a fourth thread (38) on its inner surface, the fourth thread (38) having a direction the same as that of the second thread (28) and the third thread (36) complementing the first thread (20) so that the bush (32) can be at least partly screwed into the cavity (18) of the main body (10); and a screw (42) having a head (44) and a shank (46) with a fifth thread (48) complementing the fourth thread (38) so that the shank (46) of the screw (42) can be screwed inside the tubular body (34) of the bush (32).
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