| 摘要 |
An apparatus for raising and lowering an article includes a tube, a mot or coupled to the tube for rotating the tube, a plurality of cables secured to the tube and to the article in spaced relation to each other, and a cable indexer synchronously coupled with the tube for indexing the plurality of cables along the tube as the plurality of cables are wound on the tube to wind the plurality of cables on the tube uniformly with respect to each other.
|
