Screwing Tool And Method For Controlling The Tightening Angle Of Screwed Joints
First Claim
1. A method for controlling the tightening angle of screwed joints using a hand-held screwing tool, comprising the steps of:
- monitoring torque until a predefined threshold value is reached;
measuring an angle of relative rotation from the point the threshold value has been reached;
measuring rotation of the screwing tool relative to the screwed joint from the point the threshold value has been reached;
switching off the electric tool when a predetermined angle of rotation is reached, taking into account the relative angle of rotation of the screwing tool relative to the screwed joint as a corrective value.
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Abstract
The invention proposes a method for controlling the tightening angle of screwed joints when tightening is effected using a hand-held screwing tool, wherein the torque is monitored until a predefined threshold value is reached, the angle of rotation is measured from the point the threshold value has been reached, the relative rotation of the screwing tool relative to the screwed joint is measured from the point the threshold value has been reached, and the screwing tool is switched off when a predetermined angle of rotation is reached, taking into account the relative angle of rotation of the screwing tool relative to the screwed joint as a corrective value.
29 Citations
14 Claims
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1. A method for controlling the tightening angle of screwed joints using a hand-held screwing tool, comprising the steps of:
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monitoring torque until a predefined threshold value is reached; measuring an angle of relative rotation from the point the threshold value has been reached; measuring rotation of the screwing tool relative to the screwed joint from the point the threshold value has been reached; switching off the electric tool when a predetermined angle of rotation is reached, taking into account the relative angle of rotation of the screwing tool relative to the screwed joint as a corrective value. - View Dependent Claims (2, 4, 5, 6, 10, 11, 12, 13, 14)
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3. A screwing tool comprising:
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a drive for driving an output shaft; a cut-off mechanism for switching off said drive when a predefined angle of rotation of said output shaft has been reached; a torque measuring mechanism for measuring torque during a screwing operation, until a predefined threshold value is reached; an angle measuring mechanism for measuring the angle of rotation of the output shaft from the point the predefined threshold value has been reached; an angle measuring system for measuring a relative rotation between the screwing tool and a screwed joint; and a control device configured for cutting off said drive once a predefined angle of rotation of the output shaft is reached, after the point when a threshold value had been reached, taking into account a relative rotation between said screwing tool and said screwed joint. - View Dependent Claims (7, 8, 9)
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Specification