US Patent 9976677 Dual use coupling end for pipes and fittings

The disclosure relates to a dual use coupling end including a pipe section having an annular recessed cam groove a distance from an annular endwardly facing surface of the pipe section, the cam groove defined by a curved or tapered cam groove surface extending gradually radially inwardly from an annular radial outer surface of the fitting adjacent toward the endwardly facing surface, to an annular clamp groove terminating on an opposite end by a radially outwardly extending annular clamp abutment surface located a distance from the endwardly facing surface. The clamp abutment surface extends a distance radially outwardly from the radial innermost portion to an annular beveled cam abutment surface at an acute angle to the clamp abutment surface and facing radially outwardly from the endwardly facing surface, the cam abutment surface disposed radially outwardly of the cam groove surface and including a radial outward discontinuous extension.