Patents by Inventor Charles J. Armstrong

Charles J. Armstrong has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • High pressure water assisted mining and tunnelling machine
    Patent number: 5114213
    Abstract: An accessory for a mining or tunnelling machine comprising a cutting drum is disclosed. The accessory comprises a radial piston pump mountable in the cutting drum, the pump comprising a plurality of piston and cylinder assemblies adapted to supply water under pressure to a nozzle or nozzles mounted in the periphery of the drum.
    Type: Grant
    Filed: February 22, 1991
    Date of Patent: May 19, 1992
    Assignee: Sasol Mining (Proprietary) Limited
    Inventors: Julian Kornecki, Charles J. Armstrong, deceased
  • Rotary rock drilling chuck
    Patent number: 4593769
    Abstract: A chuck for a drilling machine is fitted to a retractable spindle 21. Plungers 25 carried by a yoke 26 move when the yoke 26 abuts the front end 20 of the machine. This charges an accumulator carried inside the chuck body. Opening a valve 39 causes the chuck jaws to clamp while closing the valve 39 and opening a valve 55 causes the chuck jaws to relax.
    Type: Grant
    Filed: August 16, 1984
    Date of Patent: June 10, 1986
    Assignee: Boart International Limited
    Inventor: Charles J. Armstrong