| 摘要 |
An improved airborne hoist for use in lifting a load, particularly by means of a helicopter, comprising a pair of rotatable drums, each drum being rotatable in an opposite direction, a drive unit intergeared through a series of shafts for providing rotation to the drums, a cable holding device, in the configuration of a supplemental drum surrounding each of the first said drums, and each cable holding device provided for rotating simultaneously in unison with the rotation of its respective drum, while at the same time being axially shiftable for providing a winding or unwinding of its held cable from a constant location. The pair of drums each hold, respectively, its own cable, thereby providing a pair of cables that furnishes an inherent safety factor in that a single mechanical failure of a drum does not result in a loss of its held load. The front end of each drum forms a housing for supporting the various reduction gearing providing for lessening the speed of rotation of the drums, and the same housing of a drum is closed by a bearing mounted plate or other structure, which is intergeared by means of another gear to the respective proximate end of its drum, with said plate interconnecting with a spring unit that provides support for this end of the drum and effectively dampens any vibrations generated by the hovering craft and prevents their transmission through the hoist and to the supported load.
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