Abstract: A supporting device for ladders which has two supports which can be connected with rungs of the ladder by two connecting devices. The connecting devices form at least one pair of connecting parts which receive two rungs of the ladder in opposite direction, the connecting parts being at a variable distance from each other.

Abstract: A longitudinally variable ladder with at least two ladder parts which are displaceable relative to one another in their longitudinal direction, one part of which with its two struts forms a guide for the struts of the other part, which latter struts engage between the former struts, and the rungs, which are connected with the outer struts, lie on the front side of these struts, the rungs which are connected with the inner struts lying between the two planes which are defined by the front side and the rear side of these struts. The struts of all ladder parts have the same box profile, and the inner struts are guided between at least those two rungs of the outer struts which lie in the upper end section of these struts, from which upper end section the other ladder part is able to be pulled out, and guide rails, the guide rails being limited to the end section which carries the two rungs and in this end section at least indirectly engage on the rear side of the outer struts.