Patent ID: 6250486
Filing Date: 2001-06-26
Classification: B66C

Abstract:
An integrated balanced wire rope reeving system for a cargo container handling crane having a cargo transport trolley mounted for reciprocation along a horizontal gantry thereof, said system comprisinga first pair of wire ropes driven by a first drive drum and extending around reversing sheaves mounted at a first end of said gantry and then directed outboard to said trolley and then directed around sheaves mounted in the corners at a first end on said trolley and downward to a headblock suspended in part by said first pair of wire ropes below said trolley and then directed around sheaves mounted thereon near the opposite edges thereof and upward to said trolley and there dead-ended,a second pair of wire ropes driven by a second drive drum extending around reversing sheaves mounted at the other end of said gantry and then directed inboard to said trolley and then directed around sheaves mounted in the corners at a second end on said trolley and downward to said headblock and then directed around sheaves mounted thereon near the opposite edges thereof and upward to said trolley and there dead-ended the same as said first pair of wire ropes to also in part suspend said headblock,drive motors for said first and second drive drums,brakes for said drive drums and said transport trolley, said brakes being spring loaded locked,a programmable logic controller controlling the operation of said motors and said brakes to lift and lower a load suspended from said trolley and to unlock said brakes and move said trolley along said gantry either simultaneously or independently,mechanical control means for providing input to said programmable logic controller by a crane operator, andmeans for unlocking said brakes controlled by said mechanical control means through said programmable logic controller.