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: A floating crane whose floating base mounts a load boom with a load-handling device and a suspended-load reslinging device, the latter comprising a catch so mounted on the floating base as to project over the board thereof while in the load reslinging position, and a tie member carrying at one of its ends its own load-handling device and being adapted to successively link to the load-handling device of the load boom and to the catch in the course of load reslinging procedure.

Abstract: A floating crane on a pontoon of which installed are a crane slewing portion which carries a boom and boom slewing, boom luffing and load hoisting drives controlled by respective master controllers, and also a heel compensation device controlled by a signal from an angle-of-heel transmitter.

Abstract: The tubular shaft of a marine line shafting, comprising at least two coaxial tubes twisted around their own axis in opposite directions establishing stresses therein not going beyond the elastic strain limit. Each of the tubes is provided with flanges fixed thereto on at least one end thereof, the flanges serving as a shaft extension. The flanges are interconnected and keep the tubes in the twisted state.