Abstract: A self-contained portable self-supporting scaffolding kit for mounting adjacent an elevated structure and allowing a user to reach the elevated structure to work thereon. The kit includes a movable base assembly that supports a tower assembly along which a platform assembly moves, in a use configuration. In a portable configuration, the kit is partially disassembled, folded and secured on the base assembly for transportation thereof, with all required equipment pieces.

Abstract: A self-contained portable self-supporting scaffolding kit for mounting adjacent an elevated structure and allowing a user to reach the elevated structure to work thereon. The kit includes a movable base assembly that supports a tower assembly along which a platform assembly moves, in a use configuration. In a portable configuration, the kit is partially disassembled, folded and secured on the base assembly for transportation thereof, with all required equipment pieces.

Abstract: A driving apparatus includes a roller screw that includes a main shaft, a plurality of roller shafts projecting radially outwardly and upwardly at an angle from the radial direction of the main shaft and arranged along a helical line there around, and a plurality of rollers rotatably mounted on the roller shafts. The rollers are tapered to the same angle inwardly toward the main shaft. A rail member, adjacent to and axially oriented with the main shaft, includes a plurality of spaced projections adapted for radial engagement with the tapered rollers. The angle of the tapering is pre-determined to provide a sliding free engagement between the rollers and the projections with the interface there between being oriented to intersect the rotation axis of their respective roller shaft on the rotation axis of the main shaft. The rotation of the main shaft axially moves the roller screw relative to the rail member.

Abstract: A raising system for scaffolding, elevator cabins and the like which comprises a vertical stationary beam member from one side of which equally vertically spaced similar rack teeth are protruding, each tooth having a substantially horizontal straight top face, a framework guided for up and down movement along said beam member, a power driven shaft rotatably supported by said framework and carrying spaced radial supports, a series of parallel idle shafts extending between the supports, equally spaced from one another and radially equally spaced from the driven shaft, and a plurality of cylindrical roller assemblies rotatably mounted on the idle shafts and adapted to come in successive rolling engagement with the top faces of said teeth during upward or downward movement of said framework. Each roller assembly includes several rollers disposed side by side.