Patents Assigned to Glencross Limited
  • Water powered impulsive unit
    Patent number: 8033343
    Abstract: An impulsive unit for a jack hammer or rock drill is adapted to be powered by water, and comprises a piston slidable within a cylinder, and carrying a striker portion thereon. At least a portion of the piston and/or cylinder is coated with ceramic. The ceramic is most suitably an aluminum oxide-titanium dioxide composite, which enables the clearance between the internal diameter of the cylinder and the external diameter of the piston to be reduced to between 8 and 10 micro-meters.
    Type: Grant
    Filed: September 7, 2006
    Date of Patent: October 11, 2011
    Assignee: Glencross Limited
    Inventors: Alan Barrows, Douglas Barrows
  • Water Powered Impulsive Unit
    Publication number: 20090101378
    Abstract: An impulsive unit for a jack hammer or rock drill is adapted to be powered by water, and comprises a piston slidable within a cylinder, and carrying a striker portion thereon. At least a portion of the piston and/or cylinder is coated with ceramic. The ceramic is most suitably an aluminum oxide-titanium dioxide composite, which enables the clearance between the internal diameter of the cylinder and the external diameter of the piston to be reduced to between 8 and 10 micro-meters.
    Type: Application
    Filed: September 7, 2006
    Publication date: April 23, 2009
    Applicant: Glencross Limited
    Inventors: Alan Barrows, Douglas Barrows