Patents by Inventor Isao Sawayama

Isao Sawayama 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 automatically shifting the conveyor at the pit face in the coal mine
    Patent number: 4099781
    Abstract: Apparatus employed at the long-walled pit face in the coal mine so as to shift the conveyor toward the pit face wherein the conveyor which is arranged in front of the pit face and on which the shearer travels, is divided into several individual portions, and responding to signals transmitted from a position sensor arranged in each portion of the conveyor, a position signal generator attached to the shearer and a stroke sensor attached to one of hydraulic cylinders belonging to each portion on the conveyor, a group of electromagnetic valves for rendering operative the hydraulic cylinders which belong to that portion of the conveyor to be shifted are controlled so as to shift automatically when required only the corresponding portion of the conveyor.
    Type: Grant
    Filed: April 5, 1977
    Date of Patent: July 11, 1978
    Assignee: Taiheiyo Engineering Incorporated
    Inventors: Isao Sawayama, Hajime Endo