| 摘要 |
PROBLEM TO BE SOLVED: To provide an innovative accessory for an electric rotating tool, by setting a mounting position for a cylinder's bit body to a position where a bit portion projects from an end of a cylinder or a position where the bit portion intrudes from the end of the cylinder to depth by a given distance. SOLUTION: When a cylinder is mounted to a bit body 2, the cylinder is mounted in states that the cylinder is stopped from rotation in relation to the bit body 2, and the cylinder cannot move longitudinally to the bit body 2. A mounting position for a cylinder's bit body 2 is set to a position where a bit portion 3 projects from an end of a cylinder or a position where the bit portion intrudes from the end of the cylinder to depth by a given distance. At this time, in the bit portion 3, when the cylinder is mounted to the bit body 2, the projection length (a) by which the bit portion 3 projects from the end of the cylinder is set to be equal to a depth (b) of a groove portion 16a of a machine screw or a screw 16 inserted by the bit portion 3. Thus, troublesome of fastening work of a machine screw or a screw 16 can be perfectly eliminated.
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