Patents by Inventor Farrell A. McCann

Farrell A. McCann 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).

  • Drill break-through sensor
    Patent number: 4310269
    Abstract: An improved power drill having means for sensing when the drill bit has penetrated through the workpiece and for then retracting the drill bit from the workpiece. An electrical signal responsive to the axial force between the drill and the drill bit is used to sense when the drill bit pierces the workpiece. A sudden decrease in the axial force triggers a mechanism for retracting the drill bit from the workpiece. Means are included to detect broken bits, missing bits and previously drilled holes.
    Type: Grant
    Filed: February 19, 1980
    Date of Patent: January 12, 1982
    Assignee: Northrop Corporation
    Inventors: Horst W. Neu, Thomas Gilmore, Farrell A. McCann