Abstract: A device for locking a slewing portion of a cargo crane relative to a stationary portion thereof, comprising stops arranged respectively on these portions of the crane, and appliances for holding these stops in contact with each other at locking. The stops are rigidly secured on appropriate portions of the crane so that in the process of locking these stops are arranged at a certain distance from each other, and each appliance for holding these stops in contact is a drive-operated wedge to be placed between these stops in the process of locking.

Abstract: The load-lifting crane has a jib mounted on its framework, the end of the jib having an extension connectable thereto, the ends of the jib and of the extension carrying blocks over which a run of the rope coming from the winch is adapted to be alternatively guided to form a tackle arrangement supporting a load-engaging device. The ends, respectively, of the jib and of the extension have each mounted thereon an additional block adapted to have a run of the rope coming from the tackle, which is the double one, running over it, the end of the last-mentioned run being secured to the framework. The block over which runs the run of the rope, coming from the winch, and the respective additional block are offset relative to each other laterally of the jib by an extent not short of the diameter of the rope.