| 摘要 |
The sides (11, 12) have corner parts provided with triangular projections (15) each of which has an outer flat support surface (18). These support surfaces are arranged in a common plane which is parallel to but separate from that of the cutting edges. The cutter (10) supports against a base only by means of these support surfaces (18), and the most pointed corner of the projection encloses an angle which is less than that formed by two cutting edges (14) running together. |
