| 摘要 |
PROBLEM TO BE SOLVED: To prevent wrong selection for an engagement part by inserting the end part of a rod body for an operating handle to the hollow inside of a hollow box body in a position different in distance from the engagement parts of both ends of the hollow body and fixing the same. SOLUTION: Even if an engagement part 22 for a rotary blade is put on an ignition plug 50 with the rotary blade engagement part 22 side of a box wrench 10 down, the distance L from the end face 22a on the rotary blade engagement part 22 side of the box wrench 10 is shorter than the distance L between the upper part of a fastening nut part 51 of the ignition plug 50 and the tip 52. Therefore, the tip 52 of the ignition plug 50 first comes into contact with the insert end part 31 of a rod body 30 for an operating handle, thereby inhibiting the engagement of a hexagonal holelike engagement opening 26 of the rotary blade engagement part 22 and the fastening nut part 51 of the ignition plug 50. Thus, wrong operation such as the operation of turning the fastening nut part of the ignition plug by the rotary blade engagement part by mistake can be prevented.
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