| 摘要 |
The separately mounted fine drilling and normal drilling wheel are connectable by a coupling pin (8) set in additional bores (7) in the wheels outside of their center bores (6). The pin and associated additional bore are dimensioned so that they can be displaced easily without tools. Conveyor teeth (12) in the normal wheel are saw-tooth and divided with one half offset from the other half by half the spacing from tooth to tooth with the outer faces (16) of the teeth reaching almost up to the side walls of the drill housing. |
