Power screwdriver
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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-
Oct 29, 1991
Grant Date -
N/A
app pub date -
Jul 24, 1990
filing date -
Aug 15, 1989
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An apparatus detects stoppage of a motor of a power driven screwdriver due to the excess load. After detecting stoppage, power to the motor is increased gradually to a predetermined value to firmly tighten the screw. The time of increase of power is determined at an arbitrary value.
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