DEVICE FOR SIGNALLING TORQUE RETENSION LOSS AND BLOCKING THREADED CONNECTION SELF-UNSCREWING Russian patent published in 2017 - IPC F16B31/02 

FIELD: machine engineering.

SUBSTANCE: device for signalling torque retention loss and blocking threaded connection self-unscrewing contains two gear rings with flags mounted on the adjacent connection nuts, a spring tensioner consisting of a compression spring and a bolt with a washer and nut, and a microswitch connected into the warning protection system circuit. The flag axes are set to a position close to parallel, and are directed counter-way, and at the ends of the flags there are holes into which the spring tensioner bolt is inserted. One of the flags has a microswitch, so that a small gap is formed between the microswitch button and the second flag. The flags of the gear rings are mutually disposed so that the force vectors applied from the tensioner side to the flags create moments on the nuts directed clockwise. Between the gear rings and nuts there are transitional spline sleeves, each of which has outer triangular splines interacting with the splines of the coupling, and a hole with six or twelve faces for interaction with the faces of the nut.

EFFECT: increased reliability of the continuous control of the torque retension loss of the threaded connection, which simultaneously blocks self-unscrewing of the nut.

5 cl, 3 dwg