Patents Assigned to Tigra Harlstoff GmbH
  • Cylindrical bore head tool with hard metal cutters
    Patent number: 6986627
    Abstract: In a cylindrical cutter head tool including a shaft part with a head support platform and a cutter head disposed on the cutter head support platform, the cutter head support platform and the shaft are an integral part made of tool steel and the cutter head is a sintered hard metal body, and the cutter head support platform and the cutter head include cooperating form-locking elements by which the cutter head is centered on the cutter head support platform and rotationally firmly engaged therewith.
    Type: Grant
    Filed: December 13, 2002
    Date of Patent: January 17, 2006
    Assignee: Tigra Harlstoff GmbH
    Inventor: Harald Feld
  • Cylindrical bit with hard metal cutting edges
    Patent number: 6499919
    Abstract: In a cylindrical drill bit comprising a tool body with a head having a front face and a cylindrical shaft for chucking the tool body, a hard metal cutting plate structure is mounted on the front face of the head and includes cutting edges formed integrally with the hard metal cutting plate.
    Type: Grant
    Filed: March 27, 2001
    Date of Patent: December 31, 2002
    Assignee: Tigra Harlstoff GmbH
    Inventor: Harald Feld