SAFETY CONNECTING DEVICE, IN PARTICULAR, FOR PIPELINE, END CONNECTING COUPLING OF SUCH DEVICE AND METHOD OF NUT PRODUCING FOR IT Russian patent published in 2017 - IPC F16L19/00 

FIELD: machine building.

SUBSTANCE: invention relates to safety connection device. Device connects first end connecting coupling (1) with second end connecting coupling (2), in particular, for pipeline. Nut (15) has threaded hole (17), in which first end connecting coupling (1) is screwed in along longitudinal axis (X). In tightening position first end connecting coupling (1) supports axial mechanical stress with arranged in nut second end connecting coupling (2). Rotation preventing device is provided between nut (15, 115) and, at least, one (2) of end connecting couplings, in order to prevent relative rotation, except for those cases, when torque exceeding predetermined threshold value is applied to them. Rotation preventing device consists of, at least, one tab (21), made in nut (15) material so, that to create interferences with possibility of locking for, substantially, flat working surfaces formed on second end connecting coupling (2).

EFFECT: invention increases connecting device reliability.

19 cl, 10 dwg