Method of and apparatus for controlling nut runner

B - Operations – Transporting – 25 – B

Patent

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81/23, 81/25, 34

B25B 23/151 (2006.01) B25B 21/00 (2006.01) B25B 23/147 (2006.01) G05D 17/02 (2006.01)

Patent

CA 1302127

ABSTRACT OF THE DISCLOSURE The output shaft of a nut runner for tightening a fastener such as a bolt is first rotated with a lower torque at a higher speed. When the tightening torque of the output shaft reaches a preset switching torque, torque. When the tightening torque reaches the switching the lower-torque higher-speed rotation of the output shaft is interrupted, and thereafter the output shaft is rotated with a medium torque at a medium speed. When the tightening torque then reaches a preset snug torque, the medium-torque medium-speed rotation of the output shaft is interrupted, and thereafter the output shaft is rotated with a higher torque at a higher speed. When the tightening torque reaches a preset final torque, the higher-torque lower-speed rotation of the output shaft is stopped, thus completing the tightening of the fastener.

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