CPC B25D 17/02 (2013.01) [B28D 1/26 (2013.01); E21B 10/36 (2013.01); B25D 2222/42 (2013.01); B25D 2222/72 (2013.01)] | 14 Claims |
1. A flat chisel to process mineral materials, the flat chisel having a central longitudinal axis and a transverse axis perpendicular to the longitudinal axis, the transverse axis defining a transverse direction, the flat chisel comprising:
a shank arranged along the central longitudinal axis and having a striking surface perpendicular to the longitudinal axis; and
a blade-shaped working section with a cutting edge running in the transverse direction, the cutting edge being configured to be saddle-shaped, the cutting edge having a first concave curvature in a first plane formed between the longitudinal axis and the transverse axis, and the cutting edge has a second concave curvature in a second plane perpendicular to the central longitudinal axis and parallel to a normal axis perpendicular to the first plane.
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