| 摘要 |
PCT No. PCT/FR91/00646 Sec. 371 Date Feb. 24, 1993 Sec. 102(e) Date Feb. 24, 1993 PCT Filed Aug. 2, 1991 PCT Pub. No. WO92/02397 PCT Pub. Date Feb. 20, 1992.The device has a chassis with at least a translational drive unit, a load-carrying assembly, a device for moving a ring in a vertical direction between a retracted position in which it is above the ground and a pivoting position in which it engages the floor and allows the trolley to be lifted, and a device for pivoting the trolley when it is raised in relation to the ring. The device for vertically moving the ring includes a sliding element slidably mounted in vertical channels on the chassis and having fastened to its lower end a circular plate on which the ring is free to rotate. The upper portion of the sliding element supports the vertical load-handling assembly, and the element is connected to the chassis by drives for moving the trolley and the load in a vertical direction. The drives are provided with a device for detecting the completed rectilinear travel and controlled by an on-board control device. The drives for rotating the ring are also provided with a device for detecting the completed circular travel and controlled by the on-board control device.
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