| 摘要 |
An arrangement for guiding a drill crown or bit (8) (FIG. 4) in a given drilling path comprises an outer guide tube (7) in which a shaft (6) is rotatably arranged. The shaft is driven by a drive means (5) connected to one end of the shaft, while the bit (8) is mounted for rotation on and guided by the other end of said shaft. The axis of rotation (9) of the bit forms an angle ( alpha ) with the central axis (10) of the guide tube, said tube being non-rotatably, but axially displaceably connected to an axially feeding device through intermediate means (11).
|
