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1. (WO1981002322) LADDER
Latest bibliographic data on file with the International Bureau   

Pub. No.:    WO/1981/002322    International Application No.:    PCT/DE1981/000024
Publication Date: 20.08.1981 International Filing Date: 29.01.1981
E06C 1/16 (2006.01), E06C 1/14 (2006.01), E06C 1/383 (2006.01), E06C 1/387 (2006.01), E06C 1/39 (2006.01)
Priority Data:
3003854 02.02.1980 DE
Abstract: front page image
(EN)The double ladder comprises two pairs of uprights (301, 302) pivotingly connected about an axis (318) at their top and of which one pair is provided with cross-bars (306) forming steps, supported by girders (303). The cross-bars forming the steps (306) are located in horizontal planes when the up right are spaced from each other at the maximum and when the ladder rests on a horizontal surface. The steps (306) are pivotingly mounted on the girders (303) as well as on guides (311) extending parallel to the girders. When there is a maximum spacing between the uprights (301, 302), the girders (303) and the guides (311) form a support increasing the resistance to flexion and limiting the rotation to the steps with respect to the girders in the pivoting direction. On the side of the girders (303) opposite the other uprights (302), the steps (306) present cantilever generating, upon stepping, a rotation moment in the direction that brings the guides towards the girders. Further, the depth of the steps and the difference of height between two successive steps (306) are in the range of conventionnal dimensions for staircases.
(FR)L"echelle double comporte deux paires de montants (301, 302) reliees de facon pivotante autour d"un axe (318) a leur sommet et dont une paire est munie de traverses (306) formant des marches, portees par des longerons (303). Les traverses constituant les marches (306) se trouvent dans des plans horizontaux lorsque les montants sont ecartes au maximum et que l"echelle est posee sur une surface horizontale. Les marches (306) sont montees pivotantes sur les longerons (303) ainsi que sur des quides (311) s"etendant parallelement aux longerons. Lors de l"ecartement maximum des montants (301, 302), les longerons (303) et les guides (311) forment un appui augmentant la raideur a la flexion et limitant la rotation des marches par rapport aux longerons dans le sens de pivotement. Du cote oppose des longerons (303) aux autres montants (302) les marches (306) presentent un porte-a-faux engendrant lors de la marche un moment de rotation dans le sens d"un rapprochement des guides vers les longerons. En outre la profondeur des marches et la difference de hauteur entre deux marches (306) successives se situent dans le domaine des dimensions courantes des escaliers.
Designated States:
Publication Language: German (DE)
Filing Language: German (DE)