| 摘要 |
PCT No. PCT/SE82/00360 Sec. 371 Date Jun. 22, 1983 Sec. 102(e) Date Jun. 22, 1983 PCT Filed Nov. 1, 1982 PCT Pub. No. WO83/01638 PCT Pub. Date May 11, 1983.The invention relates to a foldable or retractable ladder, especially for use at an opening in the ceiling, for example, to an upper story such as an attic in a building or the like, which ladder comprises a plurality of sections (11,12,13) arranged in operative position of the ladder, in such a manner, that the upper section (13) of the ladder by hinge members (15) is pivotally attached to a frame (14) for the door opening, and the folding-down movement of the ladder is limited by a toggle joint arrangement (16, 17) attached to the upper section (13) of the ladder. The toggle joint arrangement consists of two toggle joints attached to each side of the frame and, respectively, each side rail of the ladder and interconnected at the ladder by means of an axle (18) extending in parallel with the runs. |
