Method for tightening screw joints with a hand held power tool
AssigneeAtlas Copco Industrial Technique AB
InventorAdam Klotblixt
Life of this patent
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Abstract
A method of a hand held torque delivering power tool for tightening a screw joint up to a predetermined target torque level, the method including applying a tightening torque to the screw joint during a tightening phase via a snug torque level, indicating during the tightening phase a torque growth characteristic, interrupting the torque application on the screw joint upon arrival at a target torque level to prevent further rotation of the screw joint, and resuming the torque application via a declination ramp at a declining rate after the target torque level is reached. The resumed torque application is declined at a rate corresponding to the indicated torque growth characteristic to obtain an ergonomically favorable torque reaction characteristic in the power tool.
Claims4
A method for tightening a screw joint up to a predetermined target torque level (TT) by means of a hand held torque delivering power tool, the method comprising:
- applying a tightening torque to the screw joint to reach the target torque level (TT) via a low torque snug level (TS),
- indicating at least one torque growth characteristic (Δt1) during a tightening phase (E) between the low torque snug level (TS) and the target torque level (TT),
- interrupting the tightening torque applied on the screw joint upon arrival at the target torque level (TT) to thereby stop further rotation of the screw joint, and
- resuming torque application via a declination ramp (F) at a declining rate after the target torque level (TT) is reached, wherein the resumed torque application is declined at a rate corresponding to said at least one torque growth characteristic (Δt1) indicated during the tightening phase before reaching the target torque level (TT) to thereby obtain an ergonomically favourable torque reaction characteristic in the hand held torque delivering power tool.
Dependencies are inferred from the claim text.