HYDRAULIC DRIVER Russian patent published in 2004 - IPC

FIELD: mechanized apparatuses with hydraulic drives for assembling and disassembling threaded joints. SUBSTANCE: nut driver includes housing 1; arranged in housing hydraulic cylinder 4 having sleeve and hollow rod 13; ratchet mechanism with front 19 and back 20 pawls mounted on the same axis. Said pawls are mutually joined through spring 21. Ratchet mechanism is joined with hydraulic cylinder through pusher 14 with eye 16. Lid 24 is mounted on housing 1; inner surface of lid is cylindrical one, it is coaxial relative to ratchet 22 engaging with eye 16 at return stroke. EFFECT: simplified design, enhanced accuracy of holding torque value of nut driver. 3 dwg