| 摘要 |
AN ARRANGEMENT FOR WIDENING AND FORMING SMALLER, VERTICAL OR STRONGLY INCLINED SHAFTS An arrangement for widening and forming smaller, vertical or strongly inclined shafts, comprises a liftable and lowerable unit, with means for fixing the unit on a desired working level in a shaft, at least one drill with a corresponding feeder rail, and means carrying the feeder rail, including means for adjusting it to different angular or turning positions around an essentially central axis, extending essentially in the direction of movement of the unit. The feeder rail in a plane extending transversely to the said central axis, and in its different turning positions has corresponding projections passing essentially centrally through the total projection of the unit in the same plane. |
