Abstract: A device for connecting sucker or drive rods, consisting of a threaded coupling and like threaded pins of adjacent rods. The ends of the pins are equipped with dogs, or lugs, that interlock, firmly linking the rods torsionally. The coupling is threaded along one of the rod pins until the dogs, or lugs, are exposed, then engaging those exposed elements with dogs, or lugs, of the adjacent rod, and finally reversing the rotation of the female coupling so that it threads back over both rods' threaded pins, and covers the engaged dog clutch elements. The rods are connected torsionally via the engaged dogs, or lugs, with the coupling serving only to keep the dogs, or lugs, engaged and to carry the tensional load of the connection. Such a connection provides a stronger torsional link between rods than connections currently available. The connection also does not require the special make-up procedure of the current systems and cannot over-tighten or back off during operation.

Abstract: In a down hole transmission having a gear set and supporting elements for aligning and securing the gear set. Tie elements disposed between the supporting elements and the housing to secure the gear set against torsional forces on a gear set.