| 摘要 |
1,153,956. Mineral-mining ploughs. GEWERKSCHAFT EISENHUTTE WESTFALIA. 18 April, 1967 [12 May, 1966], No. 17691/67. Heading E1F. A mineral-mining plough is caused to have a stepwise advance of a hopping nature in either direction along a face by a vibrator system incorporated within the plough. The system involves at least one of the out of balance, contra-rotating masses of the system being so secured on a drive shaft as to have a degree of freedom of rotational movement with respect to the shaft in the direction of rotation of the shaft. |
