| 摘要 |
<p>The base (1) has a raised edge (6) along each side and four strengthened hinge sections (5a). The base ends also have raised edges (6), each having two similar hinge sections(5a) at a higher level. Each side piece (2) has corresponding sections (5a) forming the other side of a hinge and each end piece has similar corresponding sections (5a). Locking in the erect position is by tenons on each side piece two lower and one upper at each end, mating with locating blocks on each end piece. Lugs on each end piece keep the tenons in engagement and stops (7, 9) on sides and ends and rest on base stops to give accurate positioning.</p> |
