| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an electric screwdriver operable only for a cable in the power outage. <P>SOLUTION: The electric screwdriver 10 includes a screwdriver bit tip 14a, a screwdriver bit end 14b capable of coupling or separating with the screwdriver bit tip 14a and rotated by a motor 15, a voltage detection unit 21 for detecting the voltage of the screwdriver bit tip 14a, and a discoid member 16, a compression spring 17, a stopper 18 and a stopper drive unit 19 functioning as a screwdriver bit coupling/separating means of the screwdriver bit for coupling the screwdriver bit tip 14a and the screwdriver bit end 14b only when the voltage detected by the voltage detection unit 21 is the voltage indicating that "the cable is in the power outage". <P>COPYRIGHT: (C)2013,JPO&INPIT |
