Abrasive grip pipe coupling

A reusable pipe coupling for pipe formed from a ductile material, of the type including a sleeve member, at least one sealing member contained within the sleeve member and for sealing engagement with an exterior surface of a pipe, an assembly of wedging members contained within the coupling, each wedging member having an axially directed camming surface on a radially outwardly presented surface thereof, and a camming ring movable axially with respect to said sleeve member, and having a camming surface complimentary to and coacting with said camming surface of each said wedging member for camming said wedging members radially inwardly upon axial movement of said camming ring in an appropriate direction;

• further including:
• particles of grit material on an axially directed radially inwardly presented surface of each each said wedging member for biting engagement with said exterior surface of said pipe;
• said wedging members each being formed of a ductile material, and said particles of grit material being of a hardness greater than the hardness of said pipe and said wedging members;
• whereby said particles will matrix themselves within the respective mutually presented surfaces of said pipe and said wedging members to provide an interconnection between said respective pipe and wedging members of enhanced resistance to axial and circumferential shear forces at the interface between said pipe and said wedging members.