Lifting arrangement for overhead traveling cranes

A hoist apparatus that provides substantially true vertical lift of a load, the hoist apparatus comprising:

• a frame;
• a first hoist drum mounted to the frame for rotation about a first drum axis;
• a first hoist motor drivingly connected to the first hoist drum;
• a first portion of hoist rope single reeved around the first hoist drum;
• a second hoist drum mounted to the frame for rotation about a second drum axis, the second drum axis being spaced from and substantially parallel to the first drum axis;
• a second hoist motor drivingly connected to the second hoist drum;
• a second portion of hoist rope single reeved around the second hoist drum;
• a device for engaging a load, the device including a bottom block having a bottom block and a hook coupled to the bottom block, a first sheave mounted to the bottom block and rotatable about a sheave axis, and a second sheave mounted to the bottom block and rotatable about the sheave axis, the sheave axis being spaced from and substantially parallel to the first and second drum axes, the first portion of hoist rope being reeved around the first sheave, and the second portion of hoist rope being reeved around the second sheave, such that rotation of the drums raises and lowers the device;
• a third sheave mounted to the frame and rotatable about a second sheave axis, the second sheave axis being spaced from and substantially parallel to the first and second drum axes, the first portion of hoist rope being reeved around the third sheave;
• and
• a fourth sheave mounted to the frame and rotatable about the second sheave axis, the second portion of hoist rope being reeved around the fourth sheave.

A hoist apparatus that provides substantially true vertical lift of a load, the hoist apparatus comprising:

• a frame having a trolley and a first sets of rails, the trolley being supported for movement on the first set of rails;
• a first hoist drum mounted to the trolley for rotation about a first drum axis, the first hoist drum having a first drum end and a second drum end, the second drum end of the first hoist drum being spaced from the first drum end of the first hoist drum in a certain direction;
• a first hoist motor drivingly connected to the first hoist drum;
• a first portion of hoist rope single reeved around the first hoist drum, the first portion of hoist rope having an end portion fixedly coupled to the first hoist drum adjacent the first drum end thereof;
• a second hoist drum mounted to the trolley for rotation about a second drum axis, the second drum axis being spaced from and substantially parallel to the first drum axis, the second hoist drum being axially offset with respect to the first hoist drum, the second hoist drum having a first drum end and a second drum end, the second drum end of the second hoist drum being spaced from the first drum end of the second hoist drum in the certain direction;
• a second hoist motor drivingly connected to the second hoist drum;
• a second portion of hoist rope single reeved around the second hoist drum, the second portion of hoist rope having an end portion fixedly coupled to the second hoist drum adjacent the second drum end thereof;
• a device for engaging the load, the device including a bottom block and a hook coupled to the bottom block, a first sheave mounted to the bottom block and rotatable about a sheave axis, and a second sheave mounted to the bottom block and rotatable about the sheave axis, the sheave axis being spaced from and substantially parallel to the first and second drum axes, the first portion of hoist rope being reeved around the first sheave, and the second portion of hoist rope being reeved around the second sheave, such that rotation of the drums raises and lowers the device;
• a third sheave mounted to the trolley and rotatable about a second sheave axis, the second sheave axis being spaced from and substantially parallel to the first and second drum axes, the first portion of hoist rope being reeved around the third sheave;
• and
• a fourth sheave mounted to the trolley and rotatable about the second sheave axis, the second portion of hoist rope being reeved around the fourth sheave.