IMPACT NUT WRENCH CONTROL SYSTEM Russian patent published in 2007 - IPC B25B21/00 

FIELD: machine engineering, namely control systems of impact wrenches that may be used in any branch of industry for powered assembling of threaded joints.

SUBSTANCE: impact wrench control system includes in addition two single-shot multivibrators, two pulse shapers, two OR-gates, second flip-flop and second transistor switch whose collector through light emitting indicator is connected positive terminal of power source and whose emitter is connected to common zero bus. Outlet of amplifier of shaper is connected to inlets of single-shot multivibrators; outlet of one single-shot multivibrator through first pulse shaper is connected to first inlet of first OR-gate and to setting S-inlet of second flip-flop. Outlet of other single-shot multivibrator through second pulse shaper is connected to first inlet of second OR-gate whose outlet is connected to setting R-inlet of pulse counter. Second inlet of first OR-gate is connected to outlet of AND-gate and outlet of first OR-gate is connected setting S-inlet of first flip-flop. Second inlet of second OR-gate and setting R-inlet of second flip-flop through control button are connected by means of bus "voltage of logic unit". Outlet of second flip-flop is connected to control inlet of second transistor switch.

EFFECT: enhanced quality of assembling threaded joints.

1 dwg