Rail mounted undercarriage of crane unit

摘要

Both the front and back longitudinal supports of the railed carriage are fitted left and right with a forked device which engages in the double T-profiled section of the railed support. The railed carriage can be a crane bridge or crab. The forked opening of the device has sufficient play in normal crane operation to enclose the side of the upper part of the double T-section which faces the crane bridge but does not contact it.