Patent ID: 11926023
Assignee: ATLAS COPCO INDUSTRIAL TECHNIQUE AB
Field: Machine tools (Mechanical engineering)
Classification: CPC B | IPC B

Claim 5:
6. A method for a hand held electric pulse tool for performing tightening operations in which torque is delivered in pulses to tighten a screw joint, the hand held electric pulse tool comprising an output shaft and a sensor configured to determine a parameter value associated with tightening of the screw joint, the method comprising:
providing a plurality of torque pulses on the output shaft in a tightening direction until the parameter determined by the sensor reaches a first value;
pausing the tightening during a first time interval;
providing a plurality of torque pulses on the output shaft in a loosening direction until the parameter determined by the sensor reaches a second value, the second value being lower than the first value;
pausing the tightening during a second time interval; and
providing a plurality of torque pulses on the output shaft in the tightening direction until the parameter determined by the sensor reaches a third value, the third value being higher than the second value,
wherein the torque pulses are provided in the tightening direction and the loosening direction to tighten and loosen the screw joint back and forth several times.