Impact tool control apparatus and impact tool using the same
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United States of America Patent
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Jul 13, 2004
Grant Date -
Dec 19, 2002
app pub date -
Aug 5, 2002
filing date -
Dec 16, 1999
priority date (Note) -
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Abstract
An impact tool control method and apparatus and an impact tool using the same. Pulses of torque applied to a fastener by the impact tool are measured. The duration and magnitude of the torque pulse are subtracted from a torque signal and the resulting difference is integrated over time to obtain a fastener angular velocity signal. The angular velocity signal is integrated over time to obtain a displacement signal which can be converted to a torque signal. The impact tool can be controlled based on the value of the torque signal.
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