| 摘要 |
The rock drill has a drill head (1) with integrally formed shank (4). The shank (4) is surrounded at a radial distance by a tube (7) from the drill head (1) over a large part of its length. The tube (7) carries a conveying helix (12) sitting on its outside. Centring rings (8) sitting in the end areas of the tube (7) serve to hold the tube (7) on the shank (4). At least one of the centring rings (8) can be brought into engagement with the shank (4) via driving elements (6, 14) for holding purposes. <IMAGE> |
