Patents Assigned to SDS Pty Ltd.
  • Hydraulically driven percussion hammer
    Patent number: 5803188
    Abstract: An hydraulically driven percussive hammer for use with down-the-hole percussive hammer drilling, the hammer having a piston and liner combination which provides for multiple stages where there are successive effective piston drive areas of diminishing size for both return and impact directions which minimizes peak pressures from hydraulic hammer effects.
    Type: Grant
    Filed: October 5, 1995
    Date of Patent: September 8, 1998
    Assignee: SDS Pty Ltd.
    Inventor: Malcolm Bicknell McInnes
  • Liquid-driven downhole hammer drill
    Patent number: 5497839
    Abstract: A drill stem arrangement and method in which the motor for providing the hammer action is in the drill stem near to the drill bit. The motor is driven by pressurised liquid and a proportion of the liquid is used for flushing drill cuttings and cooling the drill bit.
    Type: Grant
    Filed: December 16, 1994
    Date of Patent: March 12, 1996
    Assignee: SDS Pty Ltd.
    Inventor: Fredrich G. Moir