Abstract: A joint exhibits high tensile strength. The joint includes a solid rod having a slit or opening into which a wedge is inserted. The rod and wedge are inserted into a fitting. Only a small amount of adhesive material is applied between the fitting and the rod. The adhesive material may be blended with non-adhesive, non-compressible “beads” that have a preferred diameter in order to insure that the desired adhesive thickness is achieved between the fitting and the rod. The internal surface of the fitting has a contour which continuously and nonlinearly varies with distance along the fitting. The wedge has a dimension having a similar contour. The shape of the contour can be described by a polynomial of order two or higher. The joint can be used to construct a sucker rod for an oil well, or it can be used in other applications. The joint can support high tensile loads, over long distances, while occupying a very narrow tubing bore.

Abstract: A joint includes a solid rod having a slit or opening into which a wedge is inserted. The rod and wedge are inserted into a fitting. The internal surface of the fitting has a contour which continuously and nonlinearly varies with distance along the fitting. The wedge has a dimension having a similar contour. The shape of the contour can be described by a polynomial of order two or higher.

Abstract: A Buckling-resistant Sucker Rod for well pumps. The present invention comprises a sucker rod assembly in which the rod itself is held in tension between opposing fittings, and in which a sleeve surrounds the rod, occupying the space between the fittings. In one version, the buckling-resistant rod is assembled such that the end fittings are placed under tension prior to the installation of the sleeve, In another version, the sleeve is designed to be extendable until it places the rod segment under tension by pressing outwardly on the end fittings. Thus, the sleeve, or the combination of the sleeve and its extension, can absorb all compressive forces transmitted through the fittings, while the rod remains in a condition of tension. The invention enhances the efficiency of oil well operation, by using light-weight sucker rods, while minimizing down time due to breakage of the rods.

Abstract: A joint exhibits high tensile strength. The joint includes a solid rod having a slit or opening into which a wedge is inserted. The rod and wedge are inserted into a fitting. Only a small amount of adhesive material is applied between the fitting and the rod. The adhesive material may be blended with non-adhesive, non-compressible “beads” that have a preferred diameter in order to insure that the desired adhesive thickness is achieved between the fitting and the rod. The internal surface of the fitting has a contour which continuously and nonlinearly varies with distance along the fitting. The wedge has a dimension having a similar contour. The shape of the contour can be described by a polynomial of order two or higher. The joint can be used to construct a sucker rod for an oil well, or it can be used in other applications. The joint can support high tensile loads, over long distances, while occupying a very narrow tubing bore.

Abstract: A joint exhibits high tensile strength. The joint includes a solid rod having a slit or opening into which a wedge is inserted. The rod and wedge are inserted into a fitting. The internal surface of the fitting has a contour which continuously and nonlinearly varies with distance along the fitting. The wedge has a dimension having a similar contour. The shape of the contour can be described by a polynomial of order two or higher. The joint can be used to construct a sucker rod for an oil well, or it can be used in other applications. The joint can support high tensile loads, over long distances, while occupying a very narrow tubing bore.

Abstract: A Buckling-resistant Sucker Rod for well pumps. The present invention comprises a sucker rod assembly in which the rod itself is held in tension between opposing fittings, and in which a sleeve surrounds the rod, occupying the space between the fittings. In one version, the buckling-resistant rod is assembled such that the end fittings are placed under tension prior to the installation of the sleeve, In another version, the sleeve is designed to be extendable until it places the rod segment under tension by pressing outwardly on the end fittings. Thus, the sleeve, or the combination of the sleeve and its extension, can absorb all compressive forces transmitted through the fittings, while the rod remains in a condition of tension. The invention enhances the efficiency of oil well operation, by using light-weight sucker rods, while minimizing down time due to breakage of the rods.