Patent ID: 6666299
Filing Date: 2003-12-23
Classification: E04G

Abstract:
A movable scaffold or painting or otherwise servicing elevated sides of a cylindrical tank comprising:a wheeled truck adapted to be positioned on a top of a tank adjacent a cylindrical peripheral edge, the truck being supported by at least one wheel that is positioned for rotation about a substantially radial axis on the top of the tank; a powered truck drive mounted in the truck for driving the truck in a direction perpendicular to the wheel axis; a radial tether having an outer end attached to the truck and having an inner end adapted to be attached to a center portion of the top of the tank by attachment means that permit rotation of the tether about a vertical axis of the tank, the tether constraining the truck to circular movement around the outer peripheral edge of the top of the tank; a platform suspended from the truck so as to be positioned adjacent a side of the tank when the truck is positioned adjacent an outer peripheral edge of the top of the tank, the platform being constructed to support a paint applicator for surface preparation or application of paint to the tank sides, the platform being connected to the truck by a vertically adjustable hoist that permits the platform to be raised or lowered; and a control mechanism for selectively actuating the powered truck drive to cause circular movement of the truck around the periphery of the tank.