SUCKER ROD

摘要

A rod assembly which includes a core component and a sheath component thereof which consists of an interlaced configuration of assemblies of non-metallic filamentary elements embedded in a polymeric matrix and of elongate cross section. A major axis of the cross section whereby the bending stiffness for bending deformations about an axis parallel to the major axis is less than the bending stiffness of the same core and sheath components in a radially symetrical configuration, and in which the load-elongation characteristics of the core and sheath assemblies are selected and the core and sheath assemblies are arranged so that the core and sheath components share substantially in the load bearing.