| 摘要 |
<p>A ladder structure (1) that has two side rails (10, 11). Each rail has an elongated section of a given cross-section defining a channel and an end section of greater cross-section defining a shoulder (14). The side rails are disposed in spaced relation with the channels opening toward each other and with the end section of one rail at the bottom and the end section of the other rail at the top. A series of vertically spaced rungs (24) are pivotally connected to the side rails with the lowest rung pivotally connected in the channels in proximity with the shoulder of one rail, and the highest rung pivotally connected in the channels in proximity with the shoulder of the other rail. The ladder is constructed and arranged dimensionally such that one rail can be folded against the other rail to define an enclosed box within which the rungs are contained so that the overall folded dimensions approximate the cross-section of the end sections whereby the ladder presents the smallest volume for storage.</p> |
