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US 4,906,980 AGranted
Detector of false rotation of power screwdriver
AssigneeHayashi Tokei Kogyo Kabushiki Kaisha
InventorKenji Fukuhara
Life of this patent
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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.
Claims6
A detector of false rotation of a power screwdriver comprising:
- means for detecting the start of a final tightening of a screwdriver,
- means for detecting rotation of the screwdriver after the start of the final tightening;
- means for comparing the detected rotation with a standard value.
Dependencies are inferred from the claim text.