Masonry drill bit/chisel has a shortened lateral cutter with structured cutting edges and cutting surfaces to give an improved centering action on the start of drilling into concrete or rock etc

摘要

The masonry drill bit and/or chisel, for a power tool, has a shortened lateral cutter (40) where the cutting edges (23,23';24,24') at the tool centering section (32) are aligned at an angle to the drill center axis (30). The radial cutting surfaces (16), near the step (34), are shortened by a value (a1) of one-third to three-thirds of a width (h1), parallel to the center plane (30).