| 摘要 |
Comprises a plurality of U-shaped modules (2) having means (7) movably connecting each module (2) to the next adjacent module, at least a portion of a locking means (13) provided in said modules (2) adapted to lock said modules together in a substantially rigid manner, said locking means comprising a latch (13), a latch release means (12) and an aperture (16) to mate with said latch (13), said latch (13) located in a first module (2) and said aperture (16) located in the module immediately adjacent said first module, said latch (13) having a rounded end portion and positioned in mating alignment with said aperture (16) when said ladder is extended, said modules (2) having a curved outer surface to facilitate entrance of said latch (13) into said aperture (16), and horizontal arms (4) of said U-shaped modules providing rungs of said ladder. |
