23-03-2017 дата публикации
Номер: US20170081153A1
Crane girder () for a crane (), wherein the crane girder () includes a hollow profile () having an outer wall () enclosing a cavity () and extends longitudinally, and the outer wall () of the crane girder (), as seen in a cross-section through the crane girder (), has a shape which bulges outwards at least in some regions in order to reduce aerodynamic drag, wherein the outer wall (), as seen in the cross-section through the crane girder (), has two sections () facing one another with an outwards bulging shape, which are joined together by two straight wall sections () of the outer wall (), these straight wall sections face one another, and the crane girder () has at least one running surface () for at least one running wheel () of a trolley () of a lifting tool of the crane (), wherein the sections () facing one another with an outwards bulging shape point upwards and downwards in an operating position of the crane girder and the straight wall sections () delimit the crane girder () on the sides. 1. A crane girder for a crane , the crane girder comprising a hollow profile , having an external wall that encloses a cavity , and extends longitudinally , and the external wall , when viewed in a cross section through the crane girder , has at least in regions an outwardly bulging shape for reducing aerodynamic drag , the external wall , when viewed in the cross section through the crane girder , has two mutually opposite portions , having an outwardly bulging shape , which are interconnected by two mutually opposite straight wall portions of the external wall , and at least one running surface adapted to support at least one running wheel of a trolley of a lifting gear of the crane , the mutually opposite portions , having an outwardly bulging shape , in an operating position of the crane girder point upward and downward , and the straight wall portions in the operating position laterally delimit the crane girder , the straight wall portions extend vertically , and the ...
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