Crane safety reeving

An overhead crane comprising a traveling trolley, spaced apart cable take-up means on said trolley, separate drive means for each cable take-up means, a lift beam suspended below and movable vertically relatively to the traveling trolley, at least four cables, two connected to be taken up by one take-up means and the other two connected to be taken up by the other take-up means, a first set of sheaves on the trolley adjacent said one take-up means, a second set of sheaves on the trolley adjacent the other take-up means, a third and a fourth set of sheaves respectively at opposite ends of the lift beam, an intermediate sheave deck depending from said trolley, a fifth and sixth set of sheaves respectively at opposite ends of said sheave deck intermediate the first and third and second and fourth sets of sheaves respectively, said two cables having one cable being reeved in part around said first and third sets of sheaves and dead ending on said lift beam adjacent said third sheaves and the other cable reeved in part around said third set of sheaves and around said second and fourth sets of sheaves to dead end on said lift beam adjacent the fourth set of sheaves, and the other two cables having one cable being reeved in part around said second and fourth sets of sheaves and dead ending on said lift beam adjacent said fourth sheaves and the other cable reeved in part around said fourth set of sheaves and around said first and third sets of sheaves whereby both ends of the lift beam are in part suspended from each of the two take-up means, each of said take-up means having an equal vertical reeving.