Detector of false rotation of power screwdriver
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United States of America Patent
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-
Mar 6, 1990
Grant Date -
N/A
app pub date -
Dec 15, 1988
filing date -
Jan 14, 1988
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The start of the final tightening of a screwdriver and rotation of the screwdriver after the start of the final tightening are detected. The detected rotation is compared with a standard value. The screwdriver should rotate very little during the final tightening, if it is normally operated. Consequently when the detected rotation is more than the standard value, one may assume false rotation of the screwdriver has occurred.
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