TOOL JOINT OF HOLLOW DRILL RODS Russian patent published in 2000 - IPC

FIELD: equipment for drilling holes and joints of members for reverse transmission of torque, axial load and supply of working agent, particularly, auger drilling in construction of bored and injected piles. SUBSTANCE: tool joint has pin on end of one rod and box on end of other rod. Tool joint has bushing rigidly and tightly secured in diametrically opposite side holes of pin; fixing pin inside this bushing and sealing member located on side surface of head cylindrical part of pin. Pin part nonround in cross-section and adjacent to head part has generating lines parallel to its longitudinal axis. Diametrically opposite side holes are made on pin part nonround in cross- section. Bushing has internal locking member of locking pin made in form of split collar spring. EFFECT: higher reliability due to prolonged service life of joint components and improved tightness of joint. 3 cl, 2 dwg