| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a bolt fastening device allowing easy discrimination of a nut already fastened and fixed from a tightening object bolt. <P>SOLUTION: The bolt fastening device includes a restriction member 9 advanceably and retreatably coaxially disposed in the direction of the axis O in a socket part 5, a lock mechanism 10 locking the restriction member 9 at the advancing position where an upper end 9h of the restriction member 9 protrudes into an engaging part 6, a releasing member 11 advanceably and retreatably disposed in the direction of the axis O between the engaging part 6 of the socket part 5 and the restriction member 9, an urging member 12b urging the releasing member 11 to the advancing position where an upper end 11c of the releasing member 11 positions at an upper end 6b of the engaging part 6, and a lock releasing mechanism 13 releasing lock of the restriction member 9 by the lock mechanism 10, when retreating the releasing member 11 by engaging the engaging part 6 with a bolt head 16a. <P>COPYRIGHT: (C)2012,JPO&INPIT |
