| 摘要 |
<p>The tip (1) has a body (4) with twelve sliding surfaces that are formed at projections and including an inclination opposite to a longitudinal axis (2) of a round shank chisel. The tip is formed around the axis in a radial symmetrical manner and conical to a base area (5) over the body. The sliding surfaces run parallel to each other from a head (3) to the base area and are coiled as thread-like around the axis, where the projections are formed with respect to a plane by the axis in a mirror-symmetrical manner.</p> |
