| 摘要 |
PROBLEM TO BE SOLVED: To provide a balanced blade, in which rigidity is improved without increasing its weight, particularly not only rigidity in the periphery of a horizontal axis but also rigidity in the periphery of a vertical axis are enhanced. SOLUTION: In the blade in which approximately U-shaped horizontal member is fixed onto the rear of a plate for earth removal, another approximately U-shaped horizontal member for reinforcement is installed onto the rear of the approximately U-shaped horizontal member, and one end of the horizontal member for reinforcement is fixed onto the rear of the approximately U-shaped horizontal member while the other end of the horizontal member for reinforcement is fixed onto the rear of the plate for earth removal.
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