Patents by Inventor Dankwardt Pickhardt

Dankwardt Pickhardt has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Methods and apparatus for forming holes in workpieces
    Patent number: 4260300
    Abstract: A hole is formed in a workpiece by advancing together a pair of cutter-carrying boring bars from opposite sides of the workpiece. Rotation of the boring bars is synchronized to maintain the cutter-carrying portion of each boring bar in alignment with an axial recess in the boring bar. As the boring bars converge, the cutter-carrying portions enter the respective recesses whereby the cutter bits pass one another axially to complete the hole. The axes of rotation can be aligned to form a circular hole, or mutually spaced to form an oval hole.
    Type: Grant
    Filed: April 24, 1979
    Date of Patent: April 7, 1981
    Assignee: Sandvik Aktiebolag
    Inventor: Dankwardt Pickhardt