Electric bolt/nut fastener
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United States of America Patent
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-
Sep 29, 2009
Grant Date -
Oct 16, 2008
app pub date -
Apr 11, 2007
filing date -
Apr 12, 2006
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An abrupt fall in a current value immediately after an abrupt rise at the time when an starting switch is turned ON is detected, when the current value rises due to starting of nut fastening and then the current value abruptly falls, it is determined that an inward flange of a washer is sheared, and when the current value reaches a value corresponding to a primary fastening torque, the motor is stopped.
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