Patents by Inventor Thomas M. Hartman

Thomas M. Hartman 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).

  • Patent number: 5310249
    Abstract: Mining apparatus is disclosed in which a cutting wheel supporting a plurality of roller-cutters rotates about a horizontal axis and is supported on a slewing boom for cutting a tunnel with a flat floor and roof and elliptical walls as it slews across a mining face. The slewing boom is supported on a main beam assembly, the front end of which rests on powered crawler tracks and the rear end of which passes through a gripper assembly which may be clamped between the floor and roof of the tunnel, and against which the main beam assembly may be urged forward for engaging the roller-cutters with the mining face. A preload crawler is urged against the roof of the tunnel above the powered crawler tracks to locate the main beam assembly rigidly relative to the tunnel such that the roller-cutters may cut the rock in the mining face with minimal loss of cutting force due to vibration.
    Type: Grant
    Filed: March 8, 1993
    Date of Patent: May 10, 1994
    Assignee: Z C Mines PTY LTD
    Inventors: David B. Sugden, John Turner, Robert J. Boyd, Thomas M. Hartman, Gerald L. Dollinger, John G. Moore
  • Patent number: 5205612
    Abstract: Mining apparatus in which a cutting wheel supporting a plurality of roller-cutters rotates about a horizontal axis and is supported on a slewing boom for cutting a tunnel with a flat floor and roof and elliptical walls as it slews across a mining face. The slewing boom is supported on a main beam assembly, the front end of which rests on powered crawler tracks and the rear end of which passes through a gripper assembly which may be clamped between the floor and roof of the tunnel, and against which the main beam assembly may be urged forward for engaging the roller-cutters with the mining face. A preload crawler is urged against the roof of the tunnel above the powered crawler tracks to locate the main beam assembly rigidly relative to the tunnel such that the roller-cutters may cut the rock in the mining face with minimal loss of cutting force due to vibration.
    Type: Grant
    Filed: May 16, 1991
    Date of Patent: April 27, 1993
    Assignee: Z C Mines Pty. Ltd.
    Inventors: David B. Sugden, John Turner, Robert J. Boyd, Thomas M. Hartman, Gerald L. Dollinger, John G. Moore
  • Patent number: 5192115
    Abstract: A mobile mining machine for cutting a tunnel in rock has a wheel-like cutterhead assembly supported by a pitch boom assembly that causes movement of the cutterhead assembly in the vertical plane. A swing boom assembly supports the pitch boom assembly and is supported by the base frame of the mobile mining machine. The swing boom assembly causes movement of the cutterhead assembly and the pitch boom assembly in the horizontal plane. During mining, a fixed front support and a fixed rear support anchor the mobile mining machine in the tunnel with front and rear crawlers raised from the tunnel floor. During re-gripping, the front and rear crawlers are lowered to support the mobile mining machine and the fixed front support and fixed rear support remain in contact with the tunnel floor. During tramming, the front and rear supports are raised for transportation of the mobile mining machine on the crawler.
    Type: Grant
    Filed: May 28, 1991
    Date of Patent: March 9, 1993
    Assignee: The Robbins Company
    Inventors: Thomas M. Hartman, David B. Sugden