| 摘要 |
<p>An apparatus ( 100 ) for conveying cargo is provided, comprising a support base ( 105 ) and drive assembly ( 110 ) pivotably mounted to the support base ( 105 ) for vertical movement. The drive assembly ( 110 ) comprises a roller ( 120 ) and a first electronically controlled motor ( 125 ) for rotation the roller ( 120 ). A life assembly has a second electronically controlled motor ( 155 ) for moving the drive assembly ( 110 ) relative to the support base ( 105 ) from a retracted position to an extended position with the roller ( 120 ) in driving abutment against the cargo. An electronic controller ( 195 ) controls the first ( 125 ) and second ( 155 ) motors.</p> |
