US Patent 9637937 Coupling arrangement

A mechanical coupling arrangement for a scaffold includes a pole and a mounting collar having an attachment surface to which elongated support members can be attached. A level of radial play between the pole and the mounting collar in a first relative angular position is larger than the level of radial play between the pole and the mounting collar in a second relative angular position. The second relative angular position corresponds to a fastening position of the mounting collar, and the first relative angular position corresponds to an axial sliding position of the mounting collar.