| 摘要 |
A crane structure comprising a trolley, a beam member which is suspended from the trolley by flexible cables, a hoist on the trolley for changing the elevation of the beam, and a pair of hook assemblies. The beam is constructed to provide cam portions adjacent bearing seats so that the hook assemblies are guided from one bearing seat to another when the beam is lowered until the weight of the hook assembly is supported by a surface beneath them. A hook assembly stabilizing mechanism is also provided. The disclosure also includes a novel laminated hook construction which establishes line contact with a support which line forms a pivot axis for hook adjustment.
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