Composite material jib
AssigneeGrove U.S. L.L.C.
InventorsFranz Paschke, Kurt Vohdin
Life of this patent
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Abstract
At least one section of a jib of a crane, such as a mobile crane, includes a composite cross-section incorporating a layer of steel covered by one or more fiber composite layers. In a preferred embodiment, more than one fiber composite layer is included and the respective fiber layers are disposed in a criss-cross manner with respect to each other to enhance the overall strength of the telescopic part. Also, in a preferred embodiment the steel layer of the composite is on the interior of the telescopic part for minimizing thermal stresses due to temperature changes caused by sun loads. In another preferred embodiment, the composite fiber layers are disposed only in the zone of the cross-section of the telescopic part, which is subjected to tensile forces during use.
Claims18
In a crane assembly, a section for a jib, the section having a closed, tubular, cross-section, the improvement comprising:
- at least the part of the cross-section of the jib section that is subjected in use to tensile forces having a laminated structure including at least one layer of steel and at least one layer of fiber composite adjacent said layer of steel.
In a crane assembly, a section for a jib, the section having a closed, tubular, cross-section, the improvement comprising:
- at least the part of the cross-section of the jib section that is subjected in use to tensile forces having a laminated structure including at least one layer of steel and at least one layer of fiber composite wherein said at least one steel layer forms an inner layer, and said at least one composite layer forms an outer layer of the section.
Dependencies are inferred from the claim text.