End fitting and coupling system for sucker rods

Details End fitting and coupling system for sucker rods End fitting and coupling system for sucker rods

1986-04-08

1988-04-26

Kundrat, Andrew V.

Joints and connections

Interfitted members

Clamped members

403275, 403334, B25G 320, F16B 214

Patent

active

047401010

ABSTRACT:
A composite sucker rod to be formed into a rod string for an oil well is made by placing a coupler unit having a box end on each end of the rod. The coupler unit has a bore extending the full length of the coupler unit. For fabrication, the coupling unit is telescoped over the rod and a conic expansion portion formed on the end of the rod so that the conic expansion portion may be jammed into a tapered bore on the rod. The conic expansion portion is formed when the end is clear of the coupling unit so that it may be well bonded to the rod by precise application of adhesive, heat, and pressure. By using box end couplings on the rod and pin end couplings on coupling units between the rod it is possible to have a smaller overall outside diameter for any given strength of coupling unit.

REFERENCES:
patent: 1392480 (1921-10-01), Clarke
patent: 2659062 (1953-11-01), Tibbetts
patent: 3698749 (1972-10-01), Yonkers
patent: 4205926 (1980-06-01), Carlson
patent: 4430018 (1984-02-01), Fischer

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