| 摘要 |
<p>The boards are hooked together at the ends via transverse bolts and held in joined position. Protrusions (8) are fitted at one end of each board (1, 2) to connect positively to hooks (6, 6') at other board ends when assembled. They are bracket-shaped so that their tops form a support for the hooks whose ends lock round the bolts (7). Preferably the hooks and protrusions are moulded to end caps (3, 4).</p> |
