(under subclass 254) Coupling part, (a) including a tapering member adapted to move in the direction of connector coupling action, (i.e., parallel to the helical axis) to engage and force the helical rib to move radially into or out of screwlike engagement with the mating adapted to turn about an axis normal to the direction of connector coupling action and having a surface extending progressively away from its axis to engage and force the helical ribs to move radially into or with the mating part.
