Patents Assigned to Montrae Mining Pty. Ltd.
  • Drilling apparatus
    Patent number: 8323115
    Abstract: A cushion sub-assembly (10) for connection to a drill string to absorb vibrations in the drill string, the cushion sub-assembly (10) including a main body (12) defining a chamber therein (24), a piston member (28) disposed within the chamber (24) capable of axial movement at least partially within the chamber (24) between a first and second position, at least one axially extending piston rod (42) disposed inside a respective axial bore of the piston member (28), the at least one piston rod (42) preventing relative rotation between the piston member (28) and the main body (12) while permitting axial movement of the piston member (28) between the first and second positions, and a vibration absorbing means (44, 46, 48, 50) at opposite ends of the chamber (24) for engagement by the piston member (28) when in either of the first or second positions for absorbing axial vibrations, the configuration of the at least one piston rod (42) inside the piston member (28), and engagement of the piston member (28) with the v
    Type: Grant
    Filed: May 5, 2009
    Date of Patent: December 4, 2012
    Assignee: Montrae Mining Pty. Ltd.
    Inventor: Monte Hocking
  • DRILLING APPARATUS
    Publication number: 20110294583
    Abstract: The invention discloses a cushion sub-assembly (10) for connection to a drill string to absorb vibrations in the drill string, the cushion sub-assembly (10) including a main body (12) defining a chamber therein (24), a piston member (28) disposed within the chamber (24) capable of axial movement at least partially within the chamber (24) between a first and second position, at least one axially extending piston rod (42) disposed inside a respective axial bore of the piston member (28), the at least one piston rod (42) preventing relative rotation between the piston member (28) and the main body (12) while permitting axial movement of the piston member (28) between the first and second positions, and a vibration absorbing means (44, 46, 48, 50) at opposite ends of the chamber (24) for engagement by the piston member (28) when in either of the first or second positions for absorbing axial vibrations, the configuration of the at least one piston rod (42) inside the piston member (28), and engagement of the pisto
    Type: Application
    Filed: May 5, 2009
    Publication date: December 1, 2011
    Applicant: MONTRAE MINING PTY. LTD.
    Inventor: Monte Hocking