Patents Assigned to M. A. Ford Mfg. Co., Inc.
  • Drill
    Patent number: 4561813
    Abstract: The drill invention relates to forming holes in circuit boards and the like. Smoother holes may be formed faster by reducing tendencies of drills to chip. The drill (11) employs primary and secondary reliefs (28,29) behind cutting lips (27) to provide lesser and greater clearances, thereby strengthening the cutting lips' outer edges. The margins (10) having lengths variable in width (20,21) and variable in helix angle (22,23) facilitate the foregoing.
    Type: Grant
    Filed: June 6, 1983
    Date of Patent: December 31, 1985
    Assignee: M. A. Ford Mfg. Co., Inc.
    Inventor: Lee A. Schneider