back    Series M2500    Series M5000    Description For elevators with backbending (Z-conveyors) hold down devices are needed to keep the belt down when it is changing from horizontal to inclined direction. For wide belts (eg. > 800 mm (31.5") wide) slider shoes on the belt edge are often not sufficient to keep it on the track. In such cases hold down devices on the bottom side of the belt are used to guide it through the backbending curve.