| 摘要 |
<p>The horizontal beam (1) is swiveled (2) at one end on a vertical post (4) on a wide foundation plate (5). The far end (9) of the beam engages with the upper side of a horizontal shelf (22) mounted on a square-section post (3) containing a locking mechanism (12). The end of the beam has a hole accommodating a bolt in the locking mechanism.</p> |
