| 摘要 |
<p>A storage system in one embodiment comprising an array of storage cells, each storage cell comprising a first carrier propulsion system and a second carrier propulsion system; the first carrier propulsion system for moving a cargo carrier in a first direction, operable when in contact with the cargo carrier, and actuated by a selectively actuated motive force; the second carrier propulsion system for moving a cargo carrier in a second direction, operable when in contact with the cargo carrier, and actuated by a selectively actuated motive; and means for selectively causing or preventing contact between a cargo carrier and the first carrier propulsion system or the second carrier propulsion system.</p> |
