F - Mech Eng,Light,Heat,Weapons – 04 – B
Patent
F - Mech Eng,Light,Heat,Weapons
04
B
103/142
F04B 47/02 (2006.01) E21B 17/00 (2006.01) E21B 17/02 (2006.01) E21B 19/12 (2006.01) F04B 53/14 (2006.01) F16G 11/02 (2006.01)
Patent
CA 1181992
18 WIRE ASSEMBLIES FOR REPETITIVE, CONTINUOUS CYCLE, TENSILE LOAD CONDITIONS, PARTICULARLY SUCKER RODS FOR OIL WELLS Abstract Multi-wire steel strand for use under repetitive cyclic load conditions, such as in mechanically pumped wells, is provided with end connecting pieces which are swaged into gripping engagement with the strand in a man- ner to avoid fatigue failure of the wire at the end con- nection pieces, by avoiding abrupt load transitions in the wire. The swaging is such as to gradually and progres- sivlely transfer load from the wire strand to the end con- necting pieces, preferably by virtue of a gradual and pro- gressive increase of the grip between the wire strand and an end piece, considered in the direction of the terminal end of the strand on which the end piece is mounted, in order to gradually reduce the load in the end portion of the strand and avoid abrupt load transitions therein, which can act as stress risers. A lubricating sleeve insert prevents galling and abrading in the area of rela- tively slight grip where relative movement may occur, 50 as to avoid creating stress risers. A particular use is for oil well sucker rods, utilizing high carbon, low- relaxation, steel wire, advantageously covered with fiber- glass reinforced plastic while held under tension during curing, although the invention is appropriate for many uses. The strand diameter will be varied appropriately to suit particular conditions.
398667
Florida Wire And Cable Company
Smart & Biggar
LandOfFree
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