| 摘要 |
The invention relates to a drilling device for the dry drilling of blind holes and through holes in walls of lightly reinforced concrete, clinker, sand-lime brick and the like. It consists of a bush-shaped basic body 2 with a drill bit 3. Apertures 9 are formed in the shell 7 of the basic body 2 in a distributed manner over its periphery. The apertures 9 extend from the drill bit 3 up close to the connection plate 6 remote from the drill bit 3 and are staggered over the length of the basic body 2 (Fig. 1). <IMAGE>
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