DEVICE FOR SIGNALLING TORQUE RETENSION LOSS OF THREADED CONNECTION Russian patent published in 2017 - IPC F16B31/02 

FIELD: machine engineering.

SUBSTANCE: device for signalling torque retention loss of a threaded connection consists of a control device and a housing containing a rod and a spring. Under the two adjacent nuts of the threaded connection there are two tanged washers, on one side of the rod, located inside the housing, there is a support, on one side of the housing there is a preload adjustment nut, and on the other - an eye wherein the pull bar is located, and the control device is a microswitch with a button included in the alarm warning system circuit and fixedly located inside the housing, wherein there is a gap between the button of the microswitch and the movable spring support, moreover, the rod is movably connected to the toe of one washer and the pull bar is movably connected to the toe of another washer.

EFFECT: increased reliability of tightening control during operation.

2 cl, 3 dwg