| 摘要 |
A multi-position boom nose includes a support structure (12) disposed at one end of a boom (10). The support structure (12) supports at least a first sheave set (16), and the first sheave set (16) includes at least one sheave. A pivot arm (18) has a first end pivotally connected to the support structure. A second end of the pivot arm (18) supports a second sheave set (24), and the second sheave set (24) includes at least one sheave. The pivot arm (18) has a first working position, a second working position and a stowed position. The pivot arm (18) extends towards the boom (10) in the stowed position. Specifically, the pivot arm (18) extends into the boom (10) in the stowed position. In the first working position, the pivot arm (18) extends perpendicular to the boom (10). In the second working position, the pivot arm (18) extends away from the boom (10), and the first sheave set (16) supports a first load bearing member (28), while the second sheave set (24) supports a second load bearing member (42).
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