UNIVERSAL EMERGENCY ADAPTER Russian patent published in 2000 - IPC

FIELD: well drilling equipment, particularly, devices for releasing of stuck drilling tools. SUBSTANCE: unit of torque transmission is made in the form of n-face striker installed in lower adapter with n-face hole. Striker may move axially upward and its motion is prevented by shear member in the form of, for instance, pin. Unit of disconnection is in the form of lower adapter made of two parts interconnected by left-hand thread. Located inside the parts is n-face striker. Upper part of striker is cylindrical in shape and dew to it, shelf from n segments is formed in point of passage from n-face shape to cylindrical one. EFFECT: improved design. 3 cl, 2 dwg