Adjustable bunk

The folding bed (10) has a first segment (12) whose two side edges form right angles with the rear edge, as well as a rectangular segment (11) with each segment forming bed surfaces. Two adjoining segments are connected together along an axis for fixing in horizontal position to form a plane or to move into a fixable vertical position. Two opposite guide elements (30) each having a vertical part and horizontal part are connected at the sides to the segments through bearing elements (16) so that the segments can be moved on a predetermined path perpendicular to the axis. the vertical part of the guide elements forms a track rail whilst the bearing elements for the segments are rollers or sliders moving in same.