Patent ID: 8910979

Claim:
A pipe repair coupling, comprising: a cylindrical sleeve having an outer surface, a smooth, threadless inner surface and mutually opposed first and second ends, each of the first and second ends having an annular frustoconical seal seat, an adjacent first diameter portion, a frustoconical portion longitudinally adjacent the first diameter portion, a second diameter portion longitudinally adjacent the frustoconical portion and extending to their respective ends, the second diameter being larger than the first diameter, and a circumferential internal spline-retaining groove disposed circumferentially in the second diameter portion, the sleeve further having first and second spline access passages extending from the outer surface to the corresponding spline-retaining groove; first and second threadless seal retainers, each of the seal retainers having an outer end, wherein the outer end is formed with a first diameter, a tubular extension defining a seal-retaining end opposite the outer end, the tubular extension defining a second diameter, a frustoconical portion longitudinally adjacent the tubular extension, a third diameter portion longitudinally adjacent the frustoconical portion, the second diameter being larger than the third diameter and smaller than the first diameter, and a circumferential external spline-retaining groove disposed about the second diameter portion, the spline-retaining groove of the sleeve aligning with the corresponding spline-retaining groove of the retainer to define a spline-retaining channel when the retainers are assembled with the sleeve; first and second flexible splines, each of the splines being selectively disposed within the corresponding spline-retaining channel of the sleeve and retainer when the sleeve and retainers are assembled with one another; and a toroidal seal captured between the seal-retaining end of each of the seal retainers and the corresponding frustoconical seal seat of the sleeve when the sleeve and retainers are assembled with one another.