Target torque detection at power wrenches having mechanical release clutch
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United States of America Patent
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-
Apr 27, 2004
Grant Date -
Jan 9, 2003
app pub date -
Jul 1, 2002
filing date -
Jul 6, 2001
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A method and a power wrench for detecting the attainment of a target torque level in a screw joint tightening process, wherein an override type torque responsive release clutch (17) is used in the power wrench for defining the target torque level, comprising a microphone (22) mounted in the power wrench for recording the 'click' sound developed in the clutch (17) during the release movement, and a control unit (20) including motor operation governing means, and a signal identifying device is connected to the microphone (22) for recognizing the release 'click' sound and delivering a stop signal for interrupting the power supply to and braking the power wrench motor (15) as the clutch (17) has released and the target torque level is reached.
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