Patent ID: 8640895
Filing Date: 2014-02-04
Classification: B66C,B66D

Abstract:
1. A method of operating a crane having a continuously reeved load hoist line, with a first end of the load hoist line connected to a first drum and a second end of the load hoist line connected to a second drum, with the load hoist line reeved through boom sheaves and a hook block, the method comprising: a) applying a hold-back force to the second drum; b) applying a winding force to the first drum greater than the hold back force on the second drum; and c) applying said winding and hold back forces while limiting movement of the hook block, thereby spooling multiple layers of the load hoist line from the second drum through the boom sheaves and hook block and onto the first drum while maintaining tension in the load hoist line such that the load hoist line is wound under more tension in multiple layers on the first drum than the load hoist line had previously been wound on the second drum; d) wherein the load hoist line is unwound from the second drum while the load hoist line is simultaneously wound onto the first drum.