Patent ID: 7011345

Claim:
A cylindrical female pipe coupler B having a longitudinal axis 30 , said coupler having a spline portion 32 and a female coupling portion 34 extending in opposite directions generally parallel to said axis 30 , said spline portion 32 being attachable to a pipe A, said female coupling portion 34 having inner and outer surfaces 36 , 38 and a terminal end 42 , a sloping cam surface 44 extending from said terminal end 42 in a direction toward said longitudinal axis 30 and back toward said spline portion 32 , said cam surface 44 terminating at an intersection 46 with a shoulder 48 that extends from said inner surface 38 of said female coupling portion 34 toward said longitudinal axis 30 so that said intersection 46 is spaced toward said longitudinal axis 30 from said inner surface 38 and is spaced toward said spline portion from said terminal end 42 of said female coupling portion 34 .