| 摘要 |
An assembly for tamping ballast underneath three successive ties comprises a vertically adjustable tool carrier, three pairs of vibratory ballast tamping tools mounted on the tool carrier and arranged successively in the longitudinal direction of the track, each tamping tool including a tamping pick and the pairs of tamping tools being so spaced from each other in this direction that two adjacent proximal tools of the three pairs may be immersed in the ballast in each crib defined between the three successive ties and a respective distal tool may be immersed in the ballast in a respective crib adjacent each of sand cribs, two crank shafts mounted on the tool carrier and spaced from each other in this direction, and reciprocating drives mounted on the tool carrier and connected to the tamping tools for reciprocating the tools in this direction, the reciprocating drives connected to the two proximal tools in each crib and the distal tool adjacent thereto connecting each crank shaft to the two proximal tools and the distal tool.
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