FIELD: soil or rock drilling; mining.
SUBSTANCE: group of inventions relates to downhole tools, in particular to methods and devices for transmission of rotation energy to consumer. Threaded connection device comprises an end of a pipe with an external thread and an end of a pipe with an internal thread corresponding to an external thread. At that, it has thread profile forming at least part of internal thread or external thread and including thread profile groove, which connects the first working side of the thread profile to the second working side of the thread profile. Groove of thread profile is at least partially formed by several radii interconnected tangentially and including at least: a radius located closer to the center, a first radius distant from the center on one side of the radius located closer to the center, and a second radius distant from the center on the other side of the radius located closer to the center, wherein the radius located closer to the center is greater than the first and second radius distant from the center. First radius distant from center is connected tangentially to first working side of thread profile in first connection at tangent, and second radius remote from center is tangentially connected with second working side of thread profile in second connection along tangent, and a tangent line associated with at least one of the first tangential connection and the second tangential connection, aligned with one of first and second working sides, and first radius remote from center and second radius distant from center have different length.
EFFECT: technical result is longer threaded connection operation.
11 cl, 6 dwg
