Patent ID: 9181757
Filing Date: 2015-11-10
Classification: E21B,F16B,Y10T

Abstract:
1. An end fitting for a sucker rod comprising: an exterior surface, a closed end, an open end, and an interior surface, the interior surface comprising a wedge system defining a cavity, wherein the wedge system comprises at least one wedge shaped portion having an arcuate apogee, a perigee, a leading edge and a trailing edge, each apogee forming an arcuate perimeter of equal dimension within the cavity that is the narrowest part of the cavity associated with each wedge shaped portion, each perigee forming a perimeter of equal dimension within the cavity that is the widest part of the cavity associated with each wedge shaped portion such that the leading edge is longer than the trailing edge with the leading edge facing the open end and the trailing edge facing the closed end with respect to each wedge shaped portion, such that a force differential along the wedge system is created having compressive forces greater at the closed end of the fitting and decreasing toward the open end of the fitting.