| 摘要 |
A shaft has a horizontal primary axis of rotation and a plurality of offset secondary portions. A bladder is coupled to each secondary portion. Each bladder has an upper end, a lower end and an interior. A positive pressure source and a negative pressure source are provided. Positive tubes couple the positive pressure source with the interior of each bladder for inflation. Negative tubes operatively couple the negative pressure source with the interior of each bladder for deflation. A control assembly is provided. The control assembly sequentially inflates each bladder when rotating upwardly and sequentially deflates each bladder when rotating downwardly. A quantity of water submerges the bladders during their movement.
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