US 11,673,246 B2
Flat chisel
Peter Gerold, Weilheim (DE)
Assigned to Hilti Aktiengesellschaft, Schaan (LI)
Appl. No. 16/322,189
Filed by Hilti Aktiengesellschaft, Schaan (LI)
PCT Filed Jul. 31, 2017, PCT No. PCT/EP2017/069297
§ 371(c)(1), (2) Date Jan. 31, 2019,
PCT Pub. No. WO2018/024666, PCT Pub. Date Feb. 8, 2018.
Claims priority of application No. 16182279 (EP), filed on Aug. 2, 2016.
Prior Publication US 2019/0184539 A1, Jun. 20, 2019
Int. Cl. B25D 17/02 (2006.01); B28D 1/26 (2006.01); E21B 10/36 (2006.01)
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
OG exemplary drawing
 
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.