| 摘要 |
<p>The flat panels (1a,1b) are identical and have profiled edges. Two edges (10), are in the form of a semi-circular groove and the other two edges (12,13) are in the form of a semi-circular projection. Mortise and tenons (14,15) are provided in e edges. When the panels are brought together a two-directional location is obtained one with the mating edges, other with the mortise and tenon joints. Holes (16,17), at right angles, pass through each panel running parallel to the edges. An enlargement (18,19) of each of the holes is provided. Cables (22,23) pass through the holes, each cable having a hook at one end and an eye on the other.</p> |
