Abstract: A ladder, especially for use in manholes, where the rungs are mounted in double-walled sidepieces via respective sleeves. Each sleeve has a body wall that, to uniformly support introduced forces, extends through both walls of a sidepiece and, especially from the outside, is arrested by connections between the rung and sleeve on the one hand and the sleeve and sidepiece on the other hand. At the same time, an outwardly directed base of the sleeve protects not only the rung but also the outer wall of the sidepiece.

Abstract: A fitting for a joint for two ladder sections, which in all angle positions is adapted to lock automatically. This fitting includes a first and a second fitting part which are respectively connectable to the ends of two side pieces of a ladder section and are pivotable about a common axis. The first fitting part has associated therewith a locking unit or element movable parallel to the axis of the joint against the thrust of a return spring from a locking position into an unlocking position and vice versa, while in the second fitting part for each selectable angle position there is provided a bore for receiving the locking unit in its locking position. The locking unit is held by means of a locking mechanism first in its locked position and subsequently, after one fitting part has pivoted relative to the other fitting part, is held by arc sections between the bores of the second fitting part in its unlocked position.

Abstract: An improvement in an apparatus for transporting and depositing panels with smooth surfaces, comprising a conveyor having substantially horizontally oriented endless belt. A plurality of suction holders carried by said belt means with a suction cut and a venting valve which is opened for depositing said panel at a depositing position. Each of said suction cups is displaceable parallel with the transport direction in relation to the zone of attachment of its body to said belt by a stop provided at said depositing position in the transport path of said panels, which stop on arrival of one of said panels displaces all those adjacent suction cups holding said panel contrarily to said transport direction, which displacement opens the venting valves of all those adjacent individual suction holders holding said panel.