| 摘要 |
The invention relates to a device for the drilling, especially percussion drilling or rotary percussion drilling, of bore holes, comprising a bore crown consisting of a central inner part (3) and an outer part (4) annularly surrounding the inner part (3) and releaseably coupled thereto, wherein a releasable coupling is formed between the central inner part (3) and the annular part (4) of the bore crown by at least two projecting parts (16) mounted on one of the peripheral surfaces of the inner part (3) and the outer part (4) facing each other and complementary recesses (13, 15) cooperating therewith on the other peripheral surface of the inner part (3) or the outer part (4). According to the invention, the central inner part (3) of the bore crown that is coupled to the annular outer part (4) by coupling elements (13, 15, 16) has at least one outlet (6) for introducing a fluid in the area located in front of the bore crown and the bore crown is configured with at least one opening (7) for the passage of fluid containing the material drilled off in an area located behind the drilling surface of the bore crown, thereby reducing and optimizing the duration of drilling. |
