| 摘要 |
PROBLEM TO BE SOLVED: To provide a rotary blade-fixing part of a bush cutter, capable of reducing labors and capable of protecting a threaded member for fixing a rotary blade. SOLUTION: This rotary blade-fixing part of the bush cutter is equipped with the threaded member for fixing the rotary blade removably on the tip of a drive shaft 3 which is rotationally driven in a specified direction, wherein a spherically convex part 12 integrally molded with the threaded member to be downward convex is positioned in an area under the center of the rotary blade 1 when used, so that its upper periphery approaches to the lower surface of the rotary blade and surrounds the threaded member. The threaded member integrally molded with the spherically convex part has an internal thread 25 which fits with an external thread 21 positioned on the tip of the drive shaft, or has another external thread which fits with another internal thread positioned on the tip of the drive shaft. The rotary blade-fixing part may have another blade which is outward extended from the spherically convex part and positioned under the rotary blade.
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