Patents by Inventor Dennis Hartley

Dennis Hartley 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).

  • Apparatus for controlling a conveyor drive upon conveyor chain breakage
    Patent number: 4245739
    Abstract: A conveyor arrangement wherein difficulties associated with breakage of a conveyor chain are overcome by providing hydraulic rams mounted between conveyor parts which are urged together in operation. The pressure in the hydraulic rams is monitored and when the chain breaks, the change in pressure or hydraulic ram extension is detected by switches which switch off the conveyor motor. A computer means is notified of the monitored pressure of the hydraulic ram.
    Type: Grant
    Filed: August 28, 1978
    Date of Patent: January 20, 1981
    Assignee: Coal Industry (Patents) Limited
    Inventors: Dennis Hartley, Peter Phillips
  • Method of and apparatus for steering a mining machine
    Patent number: 4155594
    Abstract: A method of steering a mineral mining machine so as to remain in the mineral seam. Natural radiation from rock strata adjacent to the mineral seam is sensed and the machine is steered from the intensity of radiation so that a residual layer of mineral left by the machine which attenuates the radiation has a thickness which is constrained to fall within preselected limits.
    Type: Grant
    Filed: March 30, 1977
    Date of Patent: May 22, 1979
    Assignee: Coal Industry (Patents) Limited
    Inventors: Dennis Hartley, John S. Wykes
  • Steering of mining machines
    Patent number: 4072349
    Abstract: A mineral mining machine which wins a strip of mineral by separate roof and floor cutting stages comprises steering apparatus which senses the cutting horizon associated with one cutting stage to control the cutting horizon associated with the other cutting stage.
    Type: Grant
    Filed: May 19, 1976
    Date of Patent: February 7, 1978
    Assignee: Coal Industry (Patents) Limited
    Inventor: Dennis Hartley
  • Longwall mining machine with pivotal body adjustment
    Patent number: 3954299
    Abstract: A ranging drum mining machine has its cutting end gearbox pivotally mounted in trunnions for pivotal movement about an axis transverse to the axis of pivotal movement of the ranging arm.
    Type: Grant
    Filed: February 10, 1975
    Date of Patent: May 4, 1976
    Assignee: Coal Industry (Patents) Limited
    Inventor: Dennis Hartley