Anti-swing damping means for cranes

Claim 1

IN LOAD HANDLING APPARATUS INCLUDING LOAD ENGAGING MEANS AND HOIST MEANS INCLUDING A PAIR OF HOIST CABLE MEANS CONNECTED TO SAID LOAD ENGAGING MEANS FOR RAISING AND LOWERING SAID LOAD ENGAGING MEANS ALONG A GENERALLY VERTICAL PATH THE COMBINATION WITH SAID HOIST CABLE MEANS OF SHEAVE MEANS SUPPORTING EACH OF SAID HOIST CABLE MEANS AND MOUNTED FOR MOVEMENT IN RESPONSE TO SWINGING MOVEMENT OF SAID LOAD ENGAGING MEANS FROM SAID VERTICAL PATH, IN WHICH SAID SWINGING MOVEMENT EXERTS A FORCE IN A PAYOUT DIRECTION ON ONE AND PRODUCES A SLACK CONDITION ON THE OTHER OF SAID HOIST CABLE MEANS, DAMPING MEANS INCLUDING A MOVABLE MEMBER, MEANS CONNECTING SAID MOVABLE MEMBER TO AND FOR MOVEMENT IN ACCORDANCE WITH SAID MOVEMENT OF SAID SHEAVE MEANS IN RESPONSE TO SWINGING MOVEMENT OF SAID LOAD ENGAGING MEANS, SAID MOVABLE MEMBER SO ARRANGED THAT MOVEMENT OF ONE OF SAID SHEAVES IN RESPONSE TO A FORCE IN A PAYOUT DIRECTION ON ONE OF SAID HOIST CABLES IS TRANSMITTED TO THE OTHER OF SAID SHEAVES FOR MOVEMENT OF SAID OTHER SHEAVE TO A ACCOMMODATE SAID SLACK CABLE CONDITION, AND A DAMPING MEMBER CONNECTED TO AND ARRANGED TO OPPOSE MOVEMENT OF SAID MOVABLE MEMBER IN RESPONSE TO MOVEMENT OF SAID SHEAVE MEANS, AND MEANS CONNECTED TO AND OPERABLE TO MOVE SAID MOVABLE MEMBER TO SELECTIVELY MOVE ONE OF SAID SHEAVES IN A PAYOUT DIRECTION AND THE OTHER OF SAID SHEAVES IN A HEAVE DIRECTION TO SIMULTANEOUSLY PAYOUT ONE AND HEAVE THE OTHER OF SAID HOIST CABLE MEANS.