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1. WO2014143557 - WEIGHTED BOOM ASSEMBLY

유의사항: 이 텍스트는 자동적으로 광학문자인식(OCR) 처리된 텍스트입니다. 법적 용도로는 PDF 버전을 사용하십시오.

WHAT IS CLAIMED IS:

1. A boom assembly, comprising:

a lower boom including an intermediate member end and a base end, wherein the base end is configured to be pivotally coupled to a lift device;

an intermediate member pivotally coupled to the intermediate member end of the lower boom;

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 positioned to carry structural loading and a weighted portion positioned to provide counterweight for the lift device.

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 2, wherein the weighted portion of the intermediate member is integrally formed with the base portion of the intermediate member.

4. The boom assembly of Claim 3, wherein the weighted portion of the intermediate member is uniformly distributed throughout the intermediate member.

5. The boom assembly of Claim 1 , wherein the weighted portion of the intermediate member is asymmetrically distributed throughout the intermediate member.

6. The boom assembly of Claim 5, wherein the weighted portion of the intermediate member comprises a discrete boss coupled to the base portion of the intermediate member.

7. The boom assembly of Claim 1 , wherein the lower boom includes a boom base portion positioned to carry structural loading and a boom weighted portion positioned to provide counterweight for the lift device.

8. The boom assembly of Claim 7, 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.

9. The boom assembly of Claim 8, 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.

10. The boom assembly of Claim 9, 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 a ground surface.

11. The boom assembly of Claim 10, 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.

12. A boom assembly, comprising:

a lower boom including an intermediate member end and a base end, wherein the base end is configured to be pivotally coupled to a lift device;

an intermediate member pivotally coupled to the intermediate member end of the lower boom;

an upper boom having a first end pivotally coupled to the intermediate member; and a ballast coupled to the intermediate member and positioned to provide

counterweight for the lift device.

13. The boom assembly of Claim 12, wherein the ballast is integrally formed with the intermediate member.

14. The boom assembly of Claim 13, wherein the ballast comprises a discrete boss coupled to the intermediate member.

15. 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, wherein the base end coupled to the chassis;

an intermediate member pivotally coupled to the intermediate member end of the lower boom;

an upper boom including an intermediate end pivotally coupled to the intermediate member; and

a ballast coupled to the intermediate member and positioned to provide counterweight for the lift device.

16. The lift device of Claim 15, 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.

17. The lift device of Claim 16, 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.

18. The lift device of Claim 17, 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.

19. The lift device of Claim 18, 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.

20. The lift device of Claim 19, 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.