Wire assemblies for repetitive, continuous cycle, tensile load c

Details Wire assemblies for repetitive, continuous cycle, tensile load c Wire assemblies for repetitive, continuous cycle, tensile load c

1981-03-18

1983-09-13

Shedd, Wayne L.

Joints and connections

Member deformed in situ

Diverse resistance to lateral deforming force

B25G 328, F16G 1100

Patent

active

044038844

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 manner to avoid fatigue failure of the wire at the end connecting pieces, by avoiding abrupt load transitions in the wire. The swaging is such as to gradually and progressively transfer load from the wire strand to the end connecting pieces, preferably by virtue of a gradual and progressive 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 relatively slight grip where relative movement may occur, so 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 fiberglass 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.

REFERENCES:
patent: 2668280 (1954-02-01), Dupre
patent: 2910983 (1959-11-01), Everett
patent: 3013793 (1961-12-01), Howell et al.
patent: 3149860 (1964-09-01), Hallesy
patent: 3212582 (1965-10-01), Brown
patent: 3384704 (1968-05-01), Vockroth
patent: 3471904 (1969-10-01), Aho

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