| 主权项 |
1. An integral metal sucker rod having a first end, said first end comprising:
a sucker rod body having a generally cylindrical outer surface, a longitudinal axis and a rod diameter (DR); a transition section having a longitudinal axis, said transition section having a distal end disposed adjacent to a proximal end of the sucker rod body with the longitudinal axis of the transition section and the longitudinal axis of the sucker rod body aligned, said transition section including an outer surface disposed circumferentially around the longitudinal axis of the transition section, said outer surface having a longitudinal profile comprising a continuous curve beginning on the cylindrical outer surface of the sucker rod body and having a concave curved portion tangent to the cylindrical outer surface of the sucker rod, said transition section having a radius (RA) and a convex curved portion having a radius (RB), wherein RB is less than RA and a diameter of the transition section measured transverse to the longitudinal axis is continuously increasing with distance from the cylindrical outer surface of the sucker rod body; a wrench square section having a distal end disposed adjacent to a proximal end of the transition section, said wrench square section having a longitudinal axis aligned with the longitudinal axis of the sucker rod body, said wrench square section comprising at least four wrench flats orthogonal to each other; a pin shoulder section having a distal end disposed adjacent to a proximal end of the wrench square section, said pin shoulder section having a longitudinal axis aligned with the longitudinal axis of the rod body, and having a pin shoulder face disposed on a proximal end of the pin shoulder section, said pin shoulder face adapted to contact an end of a coupling, said pin shoulder face having an outer diameter (DF) and a threaded pin connection section having a longitudinal axis aligned with the longitudinal axis of the rod body, said threaded pin connection section having a distal end disposed adjacent to a proximal end of the pin shoulder section, said threaded pin connection section including threads disposed on a portion of a circumferential exterior surface of the threaded pin connection section, said threads configured to mate with threads inside the coupling. |
