Various Overhead Travelling Crane Designs
Overhead cranes also Travelling Bridge Cranes are the most widely used lifting equipment in various industries. The bridge travelling cranes consists of parallel runways with a travelling bridge girder , mounted to crane end trucks / end carriages which are equipped with wheels thanks to which the overhead travelling crane moves on the rails. And along with the bridge, there is the rope or chain system, a hoist or a winch for raising the load on the crane hook or another lifting attachments. 
Overhead cranes,single girder overhead crane, double girder overhead crane