| 摘要 |
PROBLEM TO BE SOLVED: To increase the detection accuracy of a nut fastening starting point by providing a time lag between tool driving and the nut fastening starting point to stabilize the rotation of a tool. SOLUTION: This bolt fastener is provided with a fastening section housing an inner socket 32 in an outer socket 31, and a power transmitting section 30 for rotating the two sockets 31 and 32 by a planetary gear mechanism 36, and a nut is fastened by fitting the nut of a torque shear type high strength bolt and a pin tail to the sockets 31 and 32 to rotate the sockets 31 and 32 in opposing directions. In this case, the outer socket 31 or the inner socket 32 is connected with play to the power transmitting member 30 by an elastic member 41 and, after non-load rotation equivalent to the play, fastening is carried out.
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