CAM-LIKE CONNECTION OF DRILLING RODS Russian patent published in 1996 - IPC

FIELD: well drilling. SUBSTANCE: cam-like connection of drilling rods has three cam-like semi-couplings, tail an stop. The tail is connected to one semi-coupling and its end enter inside another semi- coupling to form a gap with value not less than double value of maximum tolerance allowed in making work surfaces of cams about their nominal position. Torque is transmitted from one rod to another through coming in contact work surfaces of all cams. EFFECT: increased reliability of the connection and transmission of torque. 3 dwg