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1. (US20140271076) Weighted boom assembly
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Claims

1. A boom assembly, comprising:
a lower boom including an intermediate member end and a base end configured to be pivotally coupled to a lift device, the lower boom further including a boom base portion that comprises a tubular section positioned to carry structural loading and a boom weighted portion positioned to provide counterweight for the lift device, wherein the boom weighted portion is asymmetrically distributed along the length of the lower boom and biased toward the intermediate member end of the lower boom;
an intermediate member pivotally coupled to an end of the tubular section with a bracket;
an upper boom having a first end pivotally coupled to the intermediate member;
an intermediate link coupled directly between the upper boom and the lower boom; and
an actuator coupled between the intermediate member and the upper boom;
wherein the intermediate member includes a base portion including a pair of sidewalls positioned to carry structural loading and a weighted portion positioned to provide counterweight for the lift device, wherein the weighted portion of the intermediate member includes a discrete boss comprising at least one of a disk, a rib, and a ridge.
2. The boom assembly of claim 1, wherein the weighted portion of the intermediate member is contiguously coupled to the base portion of the intermediate member.
3. The boom assembly of claim 1, wherein the weighted portion of the intermediate member is asymmetrically distributed throughout the intermediate member.
4. The boom assembly of claim 1, further comprising an implement coupled to a second end of the upper boom and configured to engage a payload, wherein the base portion of the intermediate member and the boom base portion carry structural loading imparted on the upper boom by the payload and the implement.
5. The boom assembly of claim 4, further comprising a lower link including a lift device end configured to be pivotally coupled to the lift device and an intermediate end pivotally coupled to the intermediate member, the lower link fixing the orientation of the intermediate member relative to a ground surface.
6. The boom assembly of claim 5, wherein the lower link includes a link base portion positioned to carry structural loading and a link weighted portion positioned to provide counterweight for the lift device.
7. The boom assembly of claim 1, wherein the pair of sidewalls are sized only to carry structural loading, and wherein the discrete boss is coupled to at least one of the pair of sidewalls.
8. The boom assembly of claim 7, wherein the pair of sidewalls have a thickness sized only to carry structural loading.
9. The boom assembly of claim 8, wherein the discrete boss is at least one of positioned, shaped, and sized to provide counterweight for the lift device without undermining the functionality of the intermediate member.
10. A boom assembly, comprising:
a lower boom including an intermediate member end and a base end configured to be pivotally coupled to a lift device, the lower boom further including a boom base portion that comprises a tubular section positioned to carry structural loading and a boom weighted portion positioned to provide counterweight for the lift device, wherein the boom weighted portion is asymmetrically distributed along the length of the lower boom and biased toward the intermediate member end of the lower boom;
an intermediate member pivotally coupled to an end of the tubular section with a bracket;
an upper boom having a first end pivotally coupled to the intermediate member;
an intermediate link coupled directly between the upper boom and the lower boom; and
an actuator coupled to the intermediate member with a lift pivot and the upper boom with a lift attaching frame;
wherein the intermediate member includes a base portion including a pair of sidewalls positioned to carry structural loading and a ballast positioned to provide counterweight for the lift device, wherein the ballast includes a discrete boss comprising at least one of a disk, a rib, and a ridge.
11. The boom assembly of claim 10, wherein the ballast is integrally formed with the intermediate member.
12. A lift device, comprising:
a chassis; and
a boom assembly coupled to the chassis and moveable between a lowered position and an elevated position, comprising:
a lower boom including an intermediate member end and a base end coupled to the chassis, the lower boom further including a boom base portion that comprises a tubular section positioned to carry structural loading and a boom weighted portion positioned to provide counterweight for the lift device, wherein the boom weighted portion is asymmetrically distributed along the length of the lower boom and biased toward the intermediate member end of the lower boom;
an intermediate member pivotally coupled to an end of the tubular section with a bracket;
an upper boom including an intermediate end pivotally coupled to the intermediate member;
an intermediate link coupled directly between the upper boom and the lower boom; and
an actuator coupled to the intermediate member with a lift pivot and the upper boom with a lift attaching frame;
wherein the intermediate member includes a base portion including a pair of sidewalls positioned to carry structural loading and a ballast positioned to provide counterweight for the lift device, wherein the ballast includes a discrete boss comprising at least one of a disk, a rib, and a ridge.
13. The lift device of claim 12, further comprising a first set of wheels coupled to the chassis and a second set of wheels coupled to the chassis, wherein at least one of the first set of wheels and the second set of wheels define a tip point.
14. The lift device of claim 13, wherein the lift device has a center of gravity and movement of the boom assembly between the lowered position and the elevated position shifts the center of gravity from a first lateral position to a second lateral position.
15. The lift device of claim 14, further comprising an implement coupled to a second end of the upper boom and configured to engage a payload, wherein the intermediate member carries structural loading imparted on the upper boom by the payload and the implement.
16. The lift device of claim 15, wherein the lower boom extends from the base end in a first direction and the upper boom extends from the intermediate end in an opposing direction such that the implement is positioned on a first lateral side of the tip point and the intermediate member is positioned on a second lateral side of the tip point when the boom assembly is in the lowered position.
17. The lift device of claim 16, further comprising a tail counterweight coupled to the chassis and positioned on the first lateral side of the tip point such that the ballast generates a moment that opposes the moment generated by the tail counterweight when the boom assembly is in the elevated position.