| 摘要 |
An operator's carriage on one mast of a two-masted warehouse crane and which carriage can be raised independently of the motion, position, or operability of a load carriage mounted on the second mast. The crane comprises, in addition to the two carriages on two masts, a separate drive for vertically positioning each carriage on its respective mast, upper and lower trucks to which the ends of the masts are attached for longitudinal movement of the carriages and masts attached thereto along an upper and lower rails, and a shuttle mechanism and drive means therefor for moving loads from the load carriages onto storage racks, in a path transverse to the longitudinal path of the masts and carriages. Both carriages may be located between the masts but will be connected to only one, and in such a configuration may move vertically to their high and low limits of travel without contacting or physically interfering with each other.
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