Wire Rope Hoist With Swivel Sheave

An assembly for a wire rope hoist having a rotating drum supported by a frame, the rotating drum having a longitudinal axis and being driven by a shaft, the assembly comprising:

• a first threaded shaft supported on the frame and configured to rotate relative to the frame;
• a second threaded shaft supported on the frame and configured to rotate relative to the frame;
• a first pulley operatively associated with the shaft;
• a second pulley driven by the first pulley via a belt, the second pulley operatively associated with a first gear;
• a second gear connected to the first threaded shaft and configured to engage with the first gear;
• a third gear connected to the second threaded shaft and configured to engage with the first gear;
• wherein the first and second threaded shafts are mechanically coupled such that rotation of the shaft on the rotating drum causes the first threaded shaft and the second threaded shaft to rotate.

A wire rope hoist assembly for raising and lowering a load, the wire rope hoist system, comprising:

• a rotating drum having a spiral rope groove defined therein, the rotating drum having a longitudinal axis;
• a frame supporting the rotating drum;
• a shaft operatively associated with the rotating drum;
• a motor configured to engage with and rotate the shaft;
• a hoisting rope affixed to the drum and configured to wind into and unwind from the spiral rope groove;
• a rope guide configured to mount around the rotating drum, the rope guide configured to move laterally relative to the rotating drum to keep the hoisting rope in the spiral rope groove when winding the hoisting rope into the rope groove or unwinding it from the rope groove;
• a first threaded shaft supported on the frame and configured to rotate relative to the frame;
• a second threaded shaft supported on the frame and configured to rotate relative to the frame;
• a first pulley operatively associated with the shaft;
• a second pulley driven by the first pulley via a belt, the second pulley operatively associated with a first gear;
• a second gear connected to the first threaded shaft and configured to engage with the first gear;
• a third gear connected to the second threaded shaft and configured to engage with the first gear;
• wherein the first and second threaded shafts are mechanically coupled such that rotation of the shaft on the rotating drum causes the first threaded shaft and the second threaded shaft to rotate,
• a first threaded member disposed on the first threaded shaft,
• a second threaded member disposed the second threaded shaft,
• a sheave set connected to the first threaded member and second threaded member such that rotation of the first and second threaded shafts with the first and second threaded members prevented from rotating causes linear motion of the sheave set along an axis parallel to the longitudinal axis of the rotating drum;
• a support structure extending from the frame in spaced apart relation to the rotating drum;
• a swivel sheave pivotally mounted on the support structure;
• wherein the assembly is configured such that the hoisting rope passes through the rope guide and engages with the sheave set and then engages with the swivel sheave;
• wherein a hook for raising and lowering the load is connected to the hoist rope and is disposed on a side of the swivel sheave opposite from the rotating drum.