Abstract: In a stepladder, with two legs which are connected with each other swingably around an axis in the region of an upper end of the legs, at least one of the legs has transverse support members which are supported by a first pair of stiles, and arranged spaced apart from each other in the longitudinal direction of the first pair of stiles to form the treads, said transverse support members being developed as board-shaped threads which, when the legs are spread apart a predetermined maximum distance, the standing surface of the transverse support members is horizontal and lies in horizontal planes, the treads being connected swingably about axes parallel to each other, to the first pair of stiles and to respective link members which are parallel to the first pair of stiles whereby a mutual supporting relationship between the first pair of stiles and the link members upon a predetermined maximum spread of the legs so as to increase the resistance to bending of the first pair of stiles and limit the swingability of

Abstract: A hinge fitting for a foldable ladder having two fitting parts connected to each other by a hollow hinge pin, an interlocking device with openings in the two fitting parts to the openings in one fitting part respectively there is associated one of each of positions of swing permitting interlocking, a guide pin mounted turnably and longitudinally displaceably in the hinge pin, at least one locking bolt spaced radially from the hinge pin and arranged parallel to it, the locking bolt being movable by means of a handle connecting it to the guide pin against the force of a return spring from an interlocking position (with the locking bolt engaging into aligned of the openings of the two fitting parts) into an unlocked position with the locking bolt being located outside the opening of the one fitting part, and a locking device which secures the guide pin towards the end of its displacement from the interlocking positions into the unlocked position and without impairing its turnability against return into the inter

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.