A type of crane, which has a horizontal member (known as jib or boom) that supports a moveable hoist fixed to a wall or to a floor-mounted pillar is known as jib crane. Used mostly in industrial premises and on military vehicles, the jib may swing through an arc, giving additional lateral movement. It can be also fixed. The jib cranes can be also fitted on top floors of warehouse buildings to help lift goods to all floors from ground to top.
The jib is an operating arm that extends horizontally from the crane.The jib on a jib crane is a tilted strut that supports a fixed pulley block. Cables wrapped multiple times round the fixed block and round another block are attached to the load. The free end of the cable is pulled (manually or using a winding machine), the pulley system delivers a force to the load equal to the applied force multiplied by the number of lengths of cable passing between the two blocks. This number is known as the mechanical advantage.