| 摘要 |
1,143,939. Excavators. ETABS MATENIN. 18 May, 1966 [20 May, 1965], No. 22156/66. Heading E1F. In a bucket wheel or bucket ladder excavator each digger bucket 2 has a pivotted bottom 6 on the underside of which are two or two groups of bosses 8, 9 and each boss or each group of bosses co-operates with an associated cam member 10 or 11 disposed about the path of travel of the bucket to cause at predetermined positions along said path pivotting of the bottom in one or the other direction through the bucket. |
