Anti-sway system for a spreader suspended from a crane

摘要

An apparatus for arresting the pendulums and rotational sway motion of a suspended load relative to its lifting platform and utilizing a compensated reeving system. Rope drums are mounted on the ends of a shaft which is rotatably secured to a lifting spreader having a load attached thereto. Wire ropes are reelable from the rope drums and are secured at their ends to a feeder reel mounted on the lifting platform. Unreeling of the ropes from the drums due to sway of the load causes work to be done on a brake engaged with the shaft. The feeder reel gathers in and pays out the wire rope as the load is raised and lowered.