Patents Assigned to Gebrüder Heller Drinklage GmbH
  • Drill
    Patent number: 6250857
    Abstract: A drill having a drill head with a drill shank extending between the drill head and a plug-in end lying opposite the drill head, said drill shank having a conveying helix formed by at least two helical flutes and webs located between the flutes. The flutes comprise the same clear cross section at least in the region of the end of the drill shank adjacent the drill head and are arranged at an angle a in a range of 130° through 170° relative to one another.
    Type: Grant
    Filed: September 14, 1999
    Date of Patent: June 26, 2001
    Assignee: Gebrüder Heller Drinklage GmbH
    Inventor: Heinrich Kersten