| 摘要 |
A gantry has four separate base members adapted to move along spaced parallel tracks. In most configurations, adjustable tie rods connect the four base members into two associated pairs, each of the associated pairs being positioned to follow along one of the rails. A hydraulic ram or rams extends upward from each of the base members. A superstructure, usually in the form of four I- or H-beams in a somewhat rectangular frame configuration, is attached at the corners to the tops of the hydraulic rams for lifting a load within the space which is straddled by the gantry. Between the top of each of the rams and the beams forming the frame is a coupling which provides flexibility in a plane above the tracks. Part of the coupling is an arcuate section of a cylinder which enables the superstructure to rock by about 10 DEG . The gantry may be reconfigured in many optional ways to enable it to change the attitude of the load.
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