Patents Examined by Rouz Tabaddor
  • Patent number: 5904455
    Abstract: A drill with a drill point part that contains the drill cutter and is made of a solid hard material. The drill point part is replacably attached to the end face of a drill shaft. The drill shaft is penetrated by a shaft groove which extends in an axial direction of the shaft to accomodate the drill point part and can center the drill point part in the groove region. The drill shaft has grooves on its periphery which run in the axial direction and extend into the region of the shaft groove and continue into the region of the drill point part. The drill point part can be clamped on its side faces corresponding to and opposite the groove flanks in a force-locking manner by an insertion-clamping fit in the shaft groove.
    Type: Grant
    Filed: April 2, 1997
    Date of Patent: May 18, 1999
    Assignee: Kennametal Hertel AG
    Inventors: Ulrich Krenzer, Gebhard Mueller, Horst Jager