Patents Assigned to Densaburo Sakai
  • Combined drill and reamer
    Patent number: 4507028
    Abstract: A cutting tool combining a front drill part and a rear reamer part along one axial line, having twist drill flutes through both parts and reamer cutting edges spiraling in the opposite direction to that of the drill cutting edges, whereby the tool can provide a through hole in a workpiece having a smooth surface with one forward rotating operation.
    Type: Grant
    Filed: September 23, 1982
    Date of Patent: March 26, 1985
    Assignee: Densaburo Sakai
    Inventor: Masahiro Matsushita