| 摘要 |
This comprises at least one pair of lateral stile posts (2) holding a set of rungs (7). Each of these rungs is subdivided into a pair of half-rungs (9), articulated in respect of one of said stile posts (2, 3), with each of said half-rungs (9) being in the same shape and thickness as the other half-rung (9). These half-rungs are articulated to at least one plate (10) for connecting these together, the plates (10) for each of the rungs (10) not having any kind of joining stay between them. Each half-rung (9) has multiple supports and at least one of these has a securing device; this comprises a hook (20) for locking in the folded position, and a handle (22) for transporting this.
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