| 摘要 |
A loft ladder that is demountable from the loft hatch for use as an extension ladder and that can also be converted into a stepladder has a pair of individual ladder members (1, 2) that are normally assembled in parallel sliding relationship. The uppermost ladder member (2) may be pivotally secured to hook means (36) fastened to the loft floor in the hatchway by means of a bar (34) mounted on a slide (32) on a stile (4) of the ladder member, but spaced behind the ladder member so that the close ladder can be swung up into the loft for storage. The bar and hook are so dimensioned that the bar is only removable from the hook when the ladder is near vertical. The lower ladder member (1) carries fixed to its upper end hinges (10) which are slidably mounted on the stiles of the upper ladder. Hooks (27) on the lower end of the upper ladder engage rungs of the lower ladder to keep the two ladders together in the loft ladder and extension ladder modes, while male and female blocks (17,19) on the tops of the stiles of the two ladder members engage to restrain the hinges from sliding in the stepladder mode, in which a stay (20) is also used to maintain the separation of the ladder members. <IMAGE> |
