A crane is a piece of equipment used to lift and carry heavy loads and has a variety of operating principles and configurations. Generally, crane operating mechanisms use only four main and driven wheels. If the lift is large, additional wheels are usually used to reduce wheel pressure. When there are more than four wheels, an articulated counterbalance frame device must be used to distribute the load of the crane evenly over the wheels. The main girders are rigidly connected to the end girders and the wheels are mounted on the ends of the end girders to support the bridge over the elevation.
A bridge crane, also known as an overhead crane, is a type of material handling equipment used for lifting and moving heavy loads in various industrial settings.