Patents Assigned to RUKO GmbH Prazisionswerkzeuge
  • Multiple-stage drilling tool
    Publication number: 20040062619
    Abstract: Multiple-stage drilling tool with chip groove for drilling different bit diameters as required, which increase from stage to stage, is disclosed. The invention is characterized by a first bit stage (1-1) designed as core bit, and at least one second bit stage (1-2, 1-3) arranged above it in the form of a step, where a hole can be drilled by the core bit leaving an uncut cylinder-shaped drilling core.
    Type: Application
    Filed: July 18, 2003
    Publication date: April 1, 2004
    Applicant: RUKO GmbH Prazisionswerkzeuge
    Inventor: Josef Ruppert