Abstract: A cargo restraint system a locking ring coupled to an extension tube, wherein the locking ring comprises an annular body and one or more tabs extending from the annular body. The cargo restrain system also includes a locking tube coupled to the main body. The locking tube comprises one or more grooves complementary to the shape and size of the tabs on the locking ring. The grooves of the locking tube inhibit rotational movement of the locking ring.

Abstract: The self-elevating platform scaffolding includes a horizontal work platform suspended from a vertical mast tower and a unique lift mechanism mounted to the work platform, which raises and lowers the platform along the length of the tower. The lift mechanism uses a pinion wheel that directly engages a mast tower to raise and lower the work platform along the mast towers. The pinion wheel has a plurality of radially spaced cogs that seat within crescent shaped openings in the mast tower. The lift mechanism is mounted to the work platform adjacent the mast tower such that rotation of the pinion wheel causes the wheel to “walk” up and down the mast tower to raise and lower the platform. The geometric configuration of the pinion wheel is designed so that at least two of the cogs are always in contact with the mast tower. As the pinion wheel turns, each successive cog seats within an adjacent crescent slot in the mast tower with its contact edge bearing against the bottom edge of tower opening.