THREADED JOINT TENSIONING DEVICE Russian patent published in 1994 - IPC

FIELD: mechanical engineering. SUBSTANCE: when a working medium is fed to chamber 28 of hydraulic cylinder 2 and working cavity 29 which is in communication with it piston 3 is activated and resting against threaded link 4 draws out stud 25 and plungers 18 and 19 which effect control ring 9 rotating it in a particular direction and hence casing 5 engaged with the ring, casing 5 rotates a fastening nut. When the working medium is fed to chamber 30 and cavity 31 piston 3 and plungers 18 and 19 return to the initial position. EFFECT: simplified operation. 3 cl, 4 dwg