| 摘要 |
A movable frame slidably supported on a mobile chassis, pivot points on each of opposite sides of the movable frame, a pair of extendable members pivotally mounted at one end to each of said pivot points, the other ends of each extendable member being pivoted at spaced points on the chassis and means for individually and independently actuating the extendable members to position the movable frame about the top side of the chassis. The movable frame can rotatably support a load-carrying table and polytetrafluoroethylene plates may be used as bearing surfaces between the chassis and the movable frame and the movable frame and the rotatable table.
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