| 摘要 |
PROBLEM TO BE SOLVED: To easily and definitely confirm the state of abrasion from the front of a blade by sticking and containing a cutting edge having a doglegged cross section to the bottom plate portion of a blade-reinforcing member and also to the back portion of the blade front face plate. SOLUTION: To the rear face of a blade front face plate 1, a blade reinforcing member 2 is attached with a weld portion 3 and a blade is constituted. A bolt hole 22 is provided at the bottom plate portion 24 of the blade reinforcing member 2, and a nut 6 is attached there by welding. The cutting edge 8 is made a doglegged cross section by bending a flat plate having a width as same as the length of the blade and is provided with a bolt hole 82. The cutting edge 8 is stuck and contacted to the rear surface of the blade front face plate 1 and is attached by inserting the bolt 5. In this way, when the wear reaches the line B, the replacement time for the cutting edge 8 can be easily confirmed by visually seeing the blade from the front face by the operator. Thus, damages to the blade front face plate or pitting in the blade reinforcing member can be easily prevented.
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