Abstract: A flexible coupling having hubs secured to aligned shafts and connected to one another through the use of a flexible belt surrounding the hubs is improved by forming axial and circumferential grooves on the exterior surface of the belt, each circumferential groove lying transverse to and opening into an axial groove. A cooperating metal retainer band has respective pins formed on its interior surface for insertion into the axial grooves and rotation into the circumferential grooves, thereby fixing the retainer band in position with respect to the flexible belt and coupling. Retention of the retainer band pin within the circumferential groove is insured by displacing the center line of the axial groove from a plane perpendicularly bisecting an underlying projection of the flexible belt and by lengthening the circumferential groove.

Abstract: A flexible coupling for joining two shafts having teeth of a first hub overlapping with teeth of a second hub, the teeth being engaged by projections of a split flexible belt wrapped around the coupling and held in place by a retainer ring.

Abstract: A flexible coupling of the type having hubs secured to aligned shafts and connected to one another through the use of a belt surrounding the hubs and engaging teeth on the hubs is improved by forming projections on the interior of the belt which engage complementary receptacles on the hub teeth to prevent the hubs from moving apart in the direction transverse to their rotation.