| 摘要 |
Double-drum winch has a hook drum for actuating a hook through a hook wire wound around the hook drum and a boom drum for actuating a boom which supports the hook through a boom wire wound around the boom drum each rotatably mounted on a drum shaft, a first and a second planetary gear system each adapted to drive the hook drum and the boom drum by the drum shaft, respectively, a hook clutch for driving the hook drum through the first planetary gear system by the drum shaft when engaged and a hook brake for arresting the hook drum when engaged, a boom clutch for driving the boom drum through the second planetary gear system by the drum shaft when engaged and a boom brake for arresting the boom drum when engaged, a clutch mechanism including a forward driving connection clutch for driving the drum shaft in the forward direction, a reverse driving connection clutch for driving the drum shaft in the reverse direction and a plurality of different speed clutches for driving the drum shaft at different speeds. The hook drum and the boom drum can be actuated independently from each other in either of the forward and reverse directions at any of the different speeds by the selected operation of one or more of three manually controlled systems.
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