Several modules are mounted one above the other, each comprising a main section (10) and front and rear auxiliary ones (20,30). Each main section has a pair of side frames (11) in a rectangular pattern and with parallel top and bottom sections, also a column (14) and a main cross-beam joining the frames. The auxiliary sections are joined at their ends to the main one, and also have cross-beams between their side frames (21). Slide rails (17) with numerous rollers transport the items (M) between the side frames and parallel to them. A bottom support holds the frame in a downwards- or forwards-inclined position.
