A
crane is a type of machine, generally equipped with a
hoist rope,
wire ropes or
chains, and
sheaves, that can be used both to lift and lower materials and to move them horizontally. It is mainly used for lifting heavy things and transporting them to other places. It uses one or more
simple machines to create
mechanical advantage and thus move loads beyond the normal capability of a human. Cranes are commonly employed in the
transport industry for the loading and unloading of freight, in the
construction industry for the movement of materials and in the manufacturing industry for the assembling of
heavy equipment.