Electric bolt/nut fastener

Details Electric bolt/nut fastener Electric bolt/nut fastener

B - Operations, Transporting

25

B

B25B 28/00 (2006.01) B25B 21/00 (2006.01) B25B 31/00 (2006.01)

Patent

CA 2584568

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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