| 摘要 |
A spreader ( 1 ) for lifting a freight container ( 7, 17 ) comprises a frame ( 3, 4, 11 ) and two pairs of pickup elements ( 5 ). Each pair of pickup elements ( 5 ) are mounted at opposite ends of the frame ( 3, 4, 11 ) and the frame ( 3, 4, 11 ) is adjustable to adjust the separation of the two pairs of pickup elements ( 5 ). A detector ( 8 ) is movably mounted on the frame ( 3, 4, 11 ) for movement between a first position in which the detector ( 8 ) is closer to one pair of pickup elements ( 5 ) and a second position in which the detector ( 8 ) is closer to the other pair of pickup elements ( 5 ). The detector is adapted to detect a discontinuity in an object ( 7, 17 ) located below the spreader ( 1 ).
|
