Patents Assigned to S&T No 13 Pty. Ltd.
  • Adaptor for drilling strings with controllable air passage
    Patent number: 5119891
    Abstract: An adaptor for drilling strings has a head, sleeve and mounting block assembly to secure a drill bit to a drilling string. By reverse rotation of the drilling string, the sleeve is movable between a first position, where pressurized air from the drilling string is directed to the drill bit, to a second position, where the air is directed to the drill hole above the adaptor to clear debris from the hole. Teeth at both ends of the drill assist the adaptor to clear the hole as the drill string is rotated and retracted from the hole.
    Type: Grant
    Filed: September 25, 1990
    Date of Patent: June 9, 1992
    Assignee: S & T NO 13 Pty Ltd.
    Inventor: Darcy L. Flynn
  • Adapter for drilling strings with controllable air passage
    Patent number: 4974690
    Abstract: An adaptor for drilling strings has a head, sleeve and mounting block assembly to secure a drill bit to a drilling string. By reverse rotation of the drilling string, the sleeve is movable between a first position, where pressurized air from the drilling string is directed to the drill bit, to a second position, where the air is directed to the drill hole above the adaptor to clear debris from the hole. Teeth at both ends of the assist the adaptor to clear the hole as the drill drill string is rotated and retracted from the hole.
    Type: Grant
    Filed: June 30, 1989
    Date of Patent: December 4, 1990
    Assignee: S&T No 13 Pty. Ltd.
    Inventor: Darcy L. Flynn