Patent ID: 6260637
Filing Date: 2001-07-17
Classification: E21B

Abstract:
A rock drill having an axis, a shank and a drill head having at least one cutting tip on a front end of the drill head pointing in a direction of feed of the drill, comprising:at least one cutting edge provided at the front end of the at least one cutting tip;a rake face located in front of the at least one cutting edge and having a negative rake-face angle (.alpha.), said rake face outwardly extends along and from the at least one cutting edge; anda flank located behind the at least one cutting edge, the flank being subdivided into a first flank section adjoining the at least one cutting edge, having a first flank angle (.beta..sub.1), and a second flank section outwardly extending along and from the first flank section, the first flank section being between the at least one cutting edge and the second flank section, wherein the rake-face angle (.alpha.) is constant, the rake-face angle (.alpha.) being greater than the first flank angle (.beta..sub.1) of the first flank section.