Cranes are used to move materials vertically and laterally in ain area of limited length. They may he operated hydraulically pneumatically or electrically the important types of cranes are:
a. Pillar crane: A pillar crane may be stationary type of mobile types. It is used for light duty and for lifting loads up to 20 tones. All movements to the crane are provided by gearing and electric motor drive.
b. Overhead Bridge Crane: Overhead bride crane is shown in figure above. It has both transverse and longitudinal movements. The crane hook thus moves in a rectangular area can plats heavy fabrication floor or yard. It is used foundry power house chemical plants heavy fabrication industry steel industry etc.