| 摘要 |
<p>The end of the pivot (1) has a cavity seat groove (11) widened at the top. In the centre of this cavity is a spindle (3) coaxial with the pivot. The double threaded part (2) has a trestle shaped bottom part (21) and a pyramid projecting top part (22) shaped to suit the type of closure, with a bored hole (23). The trestle shape matches the groove and sits in it. Either shape is chosen first, then the other to match, while the spindle is inserted into the hole in the top pyramid shaped part.</p> |
