Abstract: A drive mechanism comprises a rotatable member, such as a shaft, having an axially elongated cylindrical outer surface, a second member or shaft having an axially elongated cylindrical inner surface loosely telescoped over the outer surface so as to provide an axially elongated annular space within which is contained a wrapped-spring clutch so arranged as to serve as radial load-bearing means when the clutch is disengaged whereby to journal one member on the other.

Abstract: A pintle chain link composed of a singular rigid U-shaped link member with opposite sides and an arcuate-shaped crosspiece adjoining the sides. The sides have their open ends offset from the closed ends so that the latter may fit between the former of adjacent links. The sections of the sides at the closed ends also are tapered from a relatively thick part adjoining the crosspiece to a relatively narrow part adjoining the remainder of the sides. The arcuate-shaped crosspiece is also made thicker than the sides by compressing excess material into the crosspiece.