Abstract: A coupling for transferring torque and axial force from a first member to a second member. The coupling includes a first cylindrical member having an outer peripheral surface and an end portion and a second cylindrical member having a receiving end portion. The receiving end portion has an end face with a longitudinal bore in the receiving end portion for receiving the end portion of the first cylindrical member. The end portion of the first cylindrical member has a plurality of transverse keyways in the outer peripheral surface. The receiving end portion of the second cylindrical member has a plurality of transverse slots in the receiving end portion corresponding to the plurality of transverse keyways. A key is received in each transverse keyway and protrudes from each transverse keyway into the corresponding transverse slot. A retainer ring has a bore such that the retainer ring extends over the plurality of transverse slots of the receiving end portion of the second cylindrical member.

Abstract: A coupling for transferring torque and axial force from a first member to a second member. The coupling includes a first cylindrical member having an outer peripheral surface and an end portion and a second cylindrical member having a receiving end portion. The receiving end portion has an end face with a longitudinal bore in the receiving end portion for receiving the end portion of the first cylindrical member. The end portion of the first cylindrical member has a plurality of transverse keyways in the outer peripheral surface. The receiving end portion of the second cylindrical member has a plurality of transverse slots in the receiving end portion corresponding to the plurality of transverse keyways. A key is received in each transverse keyway and protrudes from each transverse keyway into the corresponding transverse slot. A retainer ring has a bore such that the retainer ring extends over the plurality of transverse slots of the receiving end portion of the second cylindrical member.

Abstract: Automatic drill pipe breakout torque is provided by a power sub or swivel. By connecting the drive pin of the power sub to the drill pipe in a non-threaded releasable manner the power sub is able to provide the breakout torque to breakout both threaded connections of a drill pipe segment. In geophysical or seismic drilling, a sliding barrel concentric with the drive pin releasable connects the drive pin to the drill pipe by engaging ridges on the pipe upsets with dogs on the barrel interior. The releasable non-threaded connection between the drive pin and the drill pipe segment allows breakout torque to be transmitted through the drill pipe segment after the threaded connection between the drive pin and the drill pipe segment has been partially broken out.