HOISTING CRANE

A hoisting crane of the type having a horizontal jib which is pivotally mounted on a vertical tower and supports thereon a movable carriage having a lifting means. The jib is formed of a plurality of detachably couplable modules each of which is formed of at least one upper and at least one lower member extending parallel to each other in the direction of the longitudinal axis of the jib. The longitudinal members of the respective modules all have the same spacing relative to each other so that all of the modules may be constructed with the same overall dimensions on a common jig. The modules which form a jib may have varying strengths to permit the modules which are closer to the pivotal mount on the tower to have a greater load-carrying capacity than those which are disposed toward the free end of the jib, and this is accomplished by having the associated members of some of the modules formed with a greater material cross-section than that of the corresponding members of other of the modules.