Claims
- 1. A hoist apparatus comprising:a frame; a first hoist drum mounted to the frame for rotation about a first drum axis; 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 portion of hoist rope single reeved around the second hoist drum; and a device for engaging a load, the device including a main portion, a first sheave mounted to the main portion and rotatable about a sheave axis, and a second sheave mounted to the main portion and rotatable about the sheave axis, the sheave axis being sheaved from and substantially parallel to the first drum axis, 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, wherein the second hoist drum is axially offset with respect to the first hoist drum.
- 2. The hoist apparatus of claim 1, wherein the first and second portions of hoist rope are portions of a single, integrally formed rope.
- 3. The hoist apparatus of claim 2, and further comprising an equalizer sheave mounted to the frame, wherein at least one of the first and second portions of hoist rope is reeved around the equalizer sheave.
- 4. The hoist apparatus of claim 1, wherein each of the hoist rope portions includes opposite end portions, and wherein one of the end portions of each hoist rope portion is dead ended on the frame.
- 5. The hoist apparatus of claim 1, and further comprising a first hoist motor drivingly connected to the first hoist drum and a second hoist motor drivingly connected to the second hoist drum.
- 6. The hoist apparatus of claim 1, wherein the device includes a bottom block and a hook coupled to the bottom block, wherein the first and second sheaves are mounted to the bottom block.
- 7. The hoist apparatus of claim 1, wherein the hoist apparatus provides substantially true vertical lift of the load.
- 8. The hoist apparatus of claim 1, and further comprising a third sheave mounted to the frame and rotatable about a second sheave axis, and a fourth sheave mounted to the frame and rotatable about the 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 the second portion of hoist rope being reeved around the fourth sheave.
- 9. The hoist apparatus of claim 1, wherein the frame includes a trolley and a first sets of rails, wherein the trolley is supported for movement on the first set of rails, wherein the first set of rails is supported for movement on a second set of rails, and wherein the device is positioned over the load by moving the trolley with respect to the first set of rails and the first set of rails with respect to the second set of rails.
- 10. A hoist apparatus comprising:a frame; a first hoist drum mounted to the frame for rotation about a first drum axis; 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 portion of hoist rope single reeved around the second hoist drum; and a device for engaging a load, the device including a main portion, a first sheave mounted to the main portion and rotatable about a sheave axis, and a second sheave mounted to the main portion and rotatable about the sheave axis, the sheave axis being spaced from and substantially parallel to the first drum axis, 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, wherein the first and second hoist drums each include a first drum end and a second drum end, wherein the second drum end of the first drum is spaced from the first drum end of the first drum in a certain direction, wherein the second drum end of the second drum is spaced from the first drum end of the second drum in the certain direction, wherein the first portion of hoist rope includes an end portion fixedly coupled to the first hoist drum adjacent the first drum end thereof and wherein the second portion of hoist rope includes an end portion fixedly coupled to the second hoist drum adjacent the second drum end thereof.
- 11. 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.
- 12. The hoist apparatus of claim 11, wherein the second hoist drum is axially offset with respect to the first hoist drum.
- 13. The hoist apparatus of claim 11, and further comprising an equalizer sheave mounted to the frame, wherein at least one of the first and second portions of hoist rope is reeved around the equalizer sheave.
- 14. The hoist apparatus of claim 11, wherein each of the hoist rope portions includes opposite end portions, and wherein one of the end portions of each hoist rope portion is dead ended on the frame.
- 15. The hoist apparatus of claim 11, wherein the first and second hoist drums each include a first drum end and a second drum end, wherein the second drum end of the first drum is spaced from the first drum end of the first drum in a certain direction, wherein the second drum end of the second drum is spaced from the first drum end of the second drum in the certain direction, wherein the first portion of hoist rope includes an end portion fixedly coupled to the first hoist drum adjacent the first drum end thereof and wherein the second portion of hoist rope includes an end portion fixedly coupled to the second hoist drum adjacent the second drum end thereof.
- 16. The hoist apparatus of claim 11, wherein the frame includes a trolley and a first sets of rails, wherein the trolley is supported for movement on the first set of rails, wherein the first set of rails is supported for movement on a second set of rails, and wherein the device is positioned over the load by moving the trolley with respect to the first set of rails and the first set of rails with respect to the second set of rails.
- 17. 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.
- 18. The hoist apparatus of claim 17, and further comprising an equalizer sheave mounted to the trolley, wherein at least one of the first and second portions of hoist rope is reeved around the equalizer sheave.
- 19. The hoist apparatus of claim 17, wherein each of the hoist rope portions includes an end portion dead ended on the trolley.
Parent Case Info
This application claims the benefit of prior filed provisional patent application No. 60/340,164 filed on Dec. 14, 2001.
US Referenced Citations (17)
Provisional Applications (1)
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Number |
Date |
Country |
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60/340164 |
Dec 2001 |
US |