Patents Assigned to Acker Drill Co., Inc.
  • Lock device for hollow stem augers
    Patent number: 4844184
    Abstract: A locking device or button for hollow stem auger couplings including an outer body section having an internal bore, a locking pin assembly mounted within the bore, and cooperating cam structure for moving the pin assembly a predetermined distance between locked and unlocked positions. Seal means at opposite ends of the bore keeps water and dirt out of the bore and protects the cam structure.
    Type: Grant
    Filed: September 29, 1988
    Date of Patent: July 4, 1989
    Assignee: Acker Drill Co., Inc.
    Inventors: William L. Acker, III, Leroy W. Janson, Richard Pirrami