Sucker rod apparatus and method

CAFC
  • US 9,045,951 B2
  • Filed: 12/18/2013
  • Issued: 06/02/2015
  • Est. Priority Date: 08/09/2011
  • Status: Active Grant
First Claim
Patent Images

1. An end fitting for a sucker rod, the end fitting comprising:

  • a body having an interior, a closed end, an open end, and a wedge system formed in the interior, wherein the wedge system comprises;

    an outer wedge portion formed in the interior proximate to the open end, wherein the outer wedge portion comprises a first leading edge, a first trailing edge, and a first angle between the first leading edge and the first trailing edge, wherein the first leading edge faces the open end and the first trailing edge faces the closed end, and wherein an intermediate wedge portion formed in the interior between the outer wedge portion and the closed end, wherein the intermediate wedge portion comprises a second leading edge, a second trailing edge, and a second angle between the second leading edge and the second trailing edge, wherein the second leading edge faces the open end and the second trailing edge faces the closed end, and wherein the length of the second leading edge, the length of the second trailing edge, and the size of the second angle define a second distribution of force in the intermediate wedge portion; and

    an inner wedge portion formed in the interior between the intermediate wedge portion and the closed end, proximate to the closed end, wherein the inner wedge portion comprises a third leading edge, a third trailing edge, and a third angle first angle between the third leading edge and the third trailing edge, wherein the third leading edge faces the open end and the third trailing edge faces the closed end, and wherein the length of the third leading edge, the length of the third trailing edge, and the size of the third angle define a third distribution of force in the inner wedge portion,wherein at least two of the first leading edge, the second leading edge, and the third leading edge differ in length such that during use a compressive load applied to the inner wedge portion is greater than a compressive load applied to the outer wedge portion, such that compressive forces at the closed end of the body exceed compressive forces at the open end of the body, and wherein the length of the second leading edge is equal to the length of the first leading edge or the third leading edge.

View all claims
    ×
    ×

    Thank you for your feedback

    ×
    ×