| 摘要 |
PROBLEM TO BE SOLVED: To provide a metallic circular saw that smoothly enables mowing in the grass mixed of Japanese silver grass and small woods like a perfect circle circular saw blade and a chip saw, continues high mowing performance for a long time without being greatly worn away like the perfect circle circular saw blade in a short time in the soil with a lot of sand gravel, and also facilitates toothing without nicks like the chip saw.SOLUTION: Multiple arc blades for a brushcutter include: multiple cutting edge guards formed on the same circle; multiple circular arc parts provided in the rotation direction side from the cutting edge guards, having a rotation direction leading portion inside from the circle, and continued to the cutting edge guards in the rear tail side while gradually approaching the circle from the leading portion; and multiple inclined parts provided in an anti-rotation direction side from the cutting edge guards, and continued to the circular arc part in the end side from the rear tail part of the cutting edge guards while being gradually spaced from the circle. Multiple cutting blades are cut out and formed in the circular arc part, and the multiple circular arc parts are in a positional relationship of rotation symmetry to each other.SELECTED DRAWING: Figure 1 |
