| 摘要 |
The drill comprises a handle (1) with a guide part (2) and cover (3), a guide (4) for the drill bit (5) and a sleeve (9) whose base (10) is held against a stop (6) on the drill bit by a spring (11). The drill bit also has a cutting edge (7) and a spiral groove (8). When the drill is pressed against the ice, the drill bit is pushed upwards into the handle and made to rotate as the spiral groove follows the guide. |
