| 摘要 |
A movable scaffolding for painting or otherwise servicing the sides of a cylindrical tank or like structure comprises a remote controlled, powered truck that is positioned adjacent a peripheral edge of the tank and directed for circular movement around the tank. A tether connects the truck to the tank and constrains the truck to movement in a circular path around the vertical axis of the tank. A vertically raisable platform is attached to an outer side of the truck for vertical movement along outer sides of the tank. In one aspect of the invention, the truck comprises a radially oriented beam, with at least one and preferably two longitudinally spaced wheels rotatably mounted on radially oriented axles. The tether is operatively connected with an inner end of the beam, while the platform is operatively connected with an outer end of the beam
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