Continuously Adjustable Lifting Hook for Coils of Varying Width

Abstract

A lifting hook is provided for balanced lifting of coils of rolled sheet metal of varying widths. The lifting hook has a lifting frame that includes a lower arm with a forward end for penetrating a lumen of a coil. A counterweight is provided that slides along a forward portion of an upper arm of the frame. A lifting assembly also slides on the frame and is arranged to move intermediate the counterweight and a rearward portion of the frame. A leadscrew assembly including a first leadscrew and a second leadscrew having first and second pitches respectively is provided. The first leadscrew is threadedly engaged by the counterweight and the second leadscrew is threadedly engaged by the lifting assembly. The second leadscrew has a pitch that is twice the first leadscrew pitch.

Dependencies are inferred from the claim text.