| 摘要 |
The invention relates to a drilling tool comprising a drill bit with an annular base body that can be fixed to a hollow cylindrical drill pipe. The base body has tool recesses, which are distributed around the circumference of the side facing away from the drill pipe and which hold interchangeable cutting teeth, the tool head of said teeth projecting in an axial direction above the base body. A shaft, which is mounted in a shaft cavity of the tool recess, is coupled to the tool head. The aim of the invention is to obtain an optimised tool in terms of technology and resistance to wear. To achieve this, the shaft is mounted in an insertion channel of the shaft cavity, the insertion cavity terminates in a opening, which accommodates a nut, the shaft has a threaded section that projects into the opening and is screwed into the nut and the cutting tooth is held in a prestressed manner against one or more supporting surfaces of the tool recess. |
