THREADED JOINT Russian patent published in 2014 - IPC F16L15/06 E21B17/42 

FIELD: machine building.

SUBSTANCE: invention relates to threaded joints for exploration works or for operation at hydrocarbon wells. A threaded joint comprises the first component including a male end with threaded zone placed at the component's outer periphery surface, and the second component including a female end with threaded zone placed at the component's inner periphery surface. The threaded zone of the male end is screwed into the threaded zone of the female end. The threaded zones comprise the respective male and female thread turns including base, tip, connection lateral side and loading lateral side. The loading lateral side of the threaded zone at the female and/or male end is provided with a groove respectively near the base as well as with a protrusion protruding from the loading lateral side of the threaded zone at the male and/or female end respectively. Near the tip the said protrusion comprises a convex surface and a concave surface. When the joint is connected, there is a radial gap between the concave surface and the groove and an axial gap between the protrusion end and the groove bottom.

EFFECT: invention provides for higher reliability of a threaded joint.

20 cl, 6 dwg