Patent ID: 8636312
Filing Date: 2014-01-28
Classification: B66C

Abstract:
1. A lifting hook for lifting a coil comprising: a lifting frame having a lifting point; an elongate coil support member supported by said frame and extendible and retractable relative thereto said support member having a forward end and a rear end wherein the forward end penetrates a lumen of the coil in use; a lever arm pivoted about a point fast with the frame and having a first end linked to the rear end of said support member; an extendible and retractable backstop member arranged to present a coil abutment face at a desired position relative to the lifting point for balancing said hook when loaded said backstop member being linked to a second end of the lever arm opposite the first end thereof; and a second arm with ends pivotally connected between said backstop member and a point fast with said frame; wherein the backstop member, the lever arm and the second arm comprise a mechanical linkage describing a parallelogram whereby pivoting of the lever arm advances or retracts the coil abutment face while maintaining said face at a constant angle.