Patents Assigned to Fullerton Tool Company, Inc.
  • Patent number: 5636948
    Abstract: A drill for fiber-filled synthetic plastics has an axially extending body with helical grooves spiraling from a drill point toward a shank end. The grooves define helical lands between them having helical land machining edges. At the point axially tapering land and groove point surfaces converge and land point surfaces with machining edges are radiused to merge gradually with the land surfaces rearward of them. The land machining edges are configured with a negative rake. A plurality of cross notches on the lands extending over an axially extending region of the lands from substantially the axially tapering land point surfaces a predetermined distance toward the shank end are configured to create fiber-snipping crosswise helical cutting edges with a positive rake facing the point.
    Type: Grant
    Filed: May 4, 1995
    Date of Patent: June 10, 1997
    Assignee: Fullerton Tool Company, Inc.
    Inventor: William G. Rexius