Drum frame system for cranes
View Patent ↗A mobile lift crane includes a carbody having moveable ground engaging members; a rotating bed rotatably connected to the carbody such that the rotating bed can swing with respect to the ground engaging members; a boom pivotally mounted on the rotating bed; a first hoist drum mounted in a first frame connected to the rotating bed; a second hoist drum mounted in a second frame connected to the rotating bed; and a third hoist drum mounted in a third frame indirectly connected to the rotating bed by being connected to at least one of the first and second hoist drum frames. Preferably load hoist drum frames are connected to the rotating bed by removable pins, the hoist drum and frame thus being detachable from the rotating bed as a combined unit. Further a major crane component, such as a mast, a mast stop, a backhitch or a boom stop, is connected indirectly to the rotating bed such that forces directed along a line of action of the major crane component are transferred to the rotating bed through at least one of the drum frames.
1. A method of transporting and assembling a mobile lift crane, the lift crane comprising, during operation, i) a rotating bed, ii) a boom pivotally mounted on the rotating bed, iii) a first hoist drum mounted in a frame secured to the rotating bed, iv) a second hoist drum mounted in a frame secured to the rotating bed, and v) at least a first other major crane component selected from the group consisting of a mast, a mast stop, a backhitch and a boom stop, the method comprising:
a) transporting the first hoist drum mounted in its frame to a job site;
b) transporting the second hoist drum mounted in its frame to the job site;
c) transporting the rotating bed to the job site without either of the first hoist drum or second hoist drum being connected to the rotating bed;
d) pinning the first hoist drum frame to the rotating bed at the job site; and
e) pinning the first other major crane component indirectly to the rotating bed at the job site such that forces directed along a line of action of the major crane component are transferred through the frame of the first hoist drum to the rotating bed.
2. The method of claim 1 wherein the crane further comprises a third hoist drum frame, and the method comprises pinning the third hoist drum frame directly to the rotating bed, and the first hoist drum frame is pinned to the rotating bed by being stacked on top of and pinned to the third host drum frame, and the first other major crane component is pinned to the first hoist drum frame.
3. The method of claim 2 wherein the crane further comprises a fourth hoist drum in a frame, and the method comprises pinning the fourth hoist drum frame to the rotating bed and stacking the second hoist drum frame on the fourth hoist drum frame, with the second hoist drum frame being pinned to the fourth hoist drum frame.
4. The method of claim 2 wherein the third hoist drum frame includes a drum mounted in the frame when the third hoist drum frame is pinned to the rotating bed.
5. The method of claim 1 wherein wire rope on the first hoist drum is rigged to lift a load and wire rope on the second hoist drum is rigged to control the angle of the boom.
6. The method of claim 1 wherein a second other major crane component is also pinned indirectly to the rotating bed at the job site such that forces directed along a line of action of the second other major crane component is transferred through the frame of the first hoist drum to the rotating bed.
7. The method of claim 6 wherein the first other major crane component comprises a mast and the second other major crane component comprises a boom stop.
8. The method of claim 1 wherein the first other major crane component comprises a mast.
9. A method of assembling a mobile lift crane, the lift crane comprising, during operation, i) a rotating bed, ii) a boom pivotally mounted on the rotating bed, iii) a boom hoist drum mounted in a first frame secured to the rotating bed, iv) a first load hoist drum mounted in a second frame secured to the rotating bed, and v) a second load hoist drum mounted in a third frame secured to the rotating bed, the method comprising:
a) pinning two of the three drum frames to the rotating bed; and
b) stacking and pinning another of the three drum frames onto at least one of said two drum frames pinned to the rotating bed in step a).
10. The method of claim 9 wherein the second and third drum frames are pinned to the rotating bed and the first drum frame is pinned to the third drum frame.
11. The method of claim 9 wherein the crane further comprising a third load hoist drum mounted in a fourth frame, wherein the second and third drum frames are the two drum frames pinned to the rotating bed, and the first drum frame is stacked on top of and pinned directly to the third drum frame, and the fourth drum frame is stacked on top of and pinned directly to the second drum frame.
12. A mobile lift crane comprising:
a) a carbody having moveable ground engaging members;
b) a rotating bed rotatably connected to the carbody such that the rotating bed can swing with respect to the ground engaging members;
c) a boom pivotally mounted on the rotating bed;
d) a first hoist drum mounted in a first frame connected to the rotating bed;
e) a second hoist drum mounted in a second frame connected to the rotating bed; and
f) a third hoist drum mounted in a third frame indirectly connected to the rotating bed by being attached to at least one of the first and second hoist drum frames.
13. The mobile lift crane of claim 12 wherein the third hoist drum is mounted so that the elevation of the lowest portion of the third hoist drum is above the top most portions of both the first and second hoist drums.
14. The mobile lift crane of claim 12 wherein the first hoist drum comprises a first load hoist drum, and a load hoist line trained over a pulley on the boom is wound on the first load hoist drum; the second hoist drum comprises a second load hoist drum, and a load hoist line trained over a pulley on the boom is wound on the second load hoist drum; and the third hoist drum comprises a boom hoist drum, with a boom hoist line wound on the boom hoist drum.
15. The mobile lift crane of claim 12 further comprising a fourth hoist drum mounted in a frame, with the third hoist drum frame connected directly to at least the second hoist drum frame and the fourth hoist drum frame connected directly to at least the first hoist drum frame.
16. The mobile lift crane of claim 15 wherein the fourth hoist drum frame is pinned to both the first and second hoist drum frames and the third hoist drum frame is pinned to just the second hoist drum frame.
17. The mobile lift crane of claim 12 wherein the drum frames are connected to the rotating bed and to each other by removable pins, allowing the frames to be disconnected from and transported separately from the rotating bed.
18. A mobile lift crane comprising:
a) a carbody having moveable ground engaging members;
b) a rotating bed rotatably connected to the carbody such that the rotating bed can swing with respect to the ground engaging members;
c) a boom pivotally mounted on the rotating bed;
d) a first load hoist line trained over a pulley on the boom and wound on a first load hoist drum, the first load hoist drum being mounted in a first drum frame connected to the rotating bed by removable pins, the first load hoist drum and first drum frame thus being detachable from the rotating bed as a combined unit;
e) a boom hoist drum mounted in a second drum frame with a boom hoist line wound on the boom hoist drum, the second drum frame being connected to the rotating bed by removable pins, the boom hoist drum and second drum frame thus being detachable from the rotating bed as a combined unit; and
f) a first other major crane component connected indirectly to the rotating bed such that forces directed along a line of action of the first other major crane component are transferred to the rotating bed through at least one of the first and second drum frames, wherein the first other major crane component is selected from the group consisting of a mast, a mast stop, a backhitch and a boom stop.
19. The mobile lift crane of claim 18 wherein the major crane component is connected to a third drum frame in which a second load hoist drum is mounted, which in turn is connected to the first drum frame.
20. The mobile lift crane of claim 18 wherein both a mast and a boom stop are connected to the rotating bed by being connected to the at least one drum frame.