| 摘要 |
PROBLEM TO BE SOLVED: To improve the efficiency of sediment discharge by smoothly dropping sediment stuck to the inside of a bucket. SOLUTION: A bucket 11 has a circular arc-shaped projected portion 14 formed toward the tip 13a of a bottom plate 13 at the inner side of the bottom plate 13, and both the ends 14a, 14a of the circular arc-shaped are formed with a predetermined distance L from the side plates 12, 12. And when sediment is excavated with this bucket 11, air is taken in together at the rear side of a projected portion 14 so that the holding of sediment becomes unstable and thus sediment can be smoothly dropped down when the bucket is directed downward.
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