Importance

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Abstract

An anti-sway crane reeving apparatus is disclosed in which a reeving apparatus is connected between an overhead frame carried by a crane, winding drum means mounted on the frame, and a lifting beam positioned below the frame from which a load carrying means is suspended. The reeving apparatus includes a plurality of upper spaced-apart sheaves affixed to the overhead frame and a plurality of lower spaced-apart sheaves affixed to the lifting beam. Each of the lower sheaves has first and second grooves. A rope means is affixed to the drum means and overhead frame and extends between the drum means and the lower sheaves and between the upper and lower sheaves. The rope means includes a plurality of pairs of first and second ropes having a reeving path extending to and wrapping in the same direction around the first and second grooves of each of the lower sheaves. Each pair of first and second ropes extends from the lower sheaves in directions transverse to the axis of the sheaves and away from each other relative to the vertical. The ropes wrapping each lower sheave are under tension and in friction engagement with the lower sheave around which they wrap. They thus apply friction forces to the lower sheaves and lifting beam which opposes swaying forces on the sheave and lifting beam.

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First Claim