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Telescoping boom assembly with rounded profile sections and interchangeable wear pads
| Details |
Inventors: Harrgington, Daniel L.; Murphy, Shannon J.;
Assignee: Link-Belt Construction Equipment Co., L.P., LLLP (Lexington, KY); Sumitomo Construction Machinery (Lexington, KY)
Primary Examiner: Brahan; Thomas J.
Assistant Examiner:
Attorney, Agent or Firm: King & Schickli, PLLC
A boom assembly for a crane or other lifting device is provided. The boom assembly includes a plurality of telescoping boom sections, each having an at least partially rounded portion, and a plurality of corresponding wear pads for reducing friction between the adjacent boom sections during relative telescoping movement. The rounded portion includes a plurality of equiangular breaks. Each wear pad is substantially identical and includes a contoured engagement surface for positioning adjacent to one of the plurality of breaks at the lower front end of each boom section. The identical wear pads are interchangeable, which eliminates the need for keeping a plurality of substantially different shapes or sizes of wear pads on hand for positioning at the lower front ends of adjacent boom sections. Spacers may also be provided between the wear pads positioned adjacent to the breaks on outer boom sections to prevent shifting during the relative telescoping movement. |
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DETAILED DESCRIPTION In accordance with a first aspect of the invention, a boom assembly for a crane or other lifting device is provided.
The boom assembly is comprised of at least two adjacent telescoping boom sections.
A first of the telescoping boom sections includes a rounded portion formed by a plurality of substantially equiangular breaks.
A plurality of substantially identical wear pads are also provided as part of the assembly for reducing friction between the adjacent boom sections during telescoping movement.
In use, each wear pad is positioned adjacent to one of the breaks relative to the first boom section and supported by a matching second, adjacent telescoping boom section.
Hence, the wear pads not only reduce friction in the desired manner, but also are freely interchangeable.
Advantageously, this eliminates the need for keeping a plurality of different types of non-identical replacement wear pads on hand such as for positioning between the lower front ends of adjacent boom sections, either at the job site or in the inventory kept by the manufacturer at a remote location.
In one embodiment, each of the plurality of breaks formed in each side of the lower portion of the first boom section are equidistant from each other.
Additionally, at least a portion of the outer surface of the first boom section on either side of each break is substantially flat.
To ensure that intimate contact is established with the corresponding boom section, including the flat segments between the adjacent breaks, each substantially identical wear pad is provided with a contoured engagement surface.
This contoured engagement surface is preferably substantially V-shaped to match the shape of the corresponding outer surface of the boom section.
However, the use of other equivalent shapes or contours capable of achieving the desired friction-reducing engagement is also possible.
Normally, the boom is formed of three or more nested telescoping boom sections, each identical in shape and increasing in cross-sectional size from the innermost to the outermost boom section
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