Patents by Inventor Kenneth S. DuFour

Kenneth S. DuFour 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).

  • Spring biased spool type valve controller for a pneumatic dual diaphragm control system
    Patent number: 4666073
    Abstract: The invention relates to a direct acting pneumatic control system for controlling a dual diaphragm, or double acting cylinder type automatic guiding system. The control device and system is used to selectively adjust the position of one end of a roll relative to the opposite end, in order to adjust the position of an endless web traveling over a series of rolls.In order to adjust and control the guide roll position, it is necessary to alternately exhaust one diaphragm, and or cylinder end, while maintaining the flow of air to the opposite diaphragm or cylinder end. This in effect shifts the roll in a lateral position, effectively steering the web in the proper direction to effect the necessary web correction.
    Type: Grant
    Filed: July 1, 1985
    Date of Patent: May 19, 1987
    Inventor: Kenneth S. DuFour
  • Differential pressure biased spool type valve controller for a pneumatic dual diaphragm control system
    Patent number: 4655378
    Abstract: The invention relates to a direct acting pneumatic control system for controlling a dual diaphragm, or double acting cylinder type automatic guiding system. The control device and system is used to selectively adjust the position of one end of a guide roll relative to the opposite end, in order to adjust the position of an endless web traveling over a series of rolls.In order to adjust and control the guide roll position, it is necessary to alternately exhaust one diaphragm, and or cylinder end, while maintaining the flow of air to the opposite diaphragm or cylinder end. This in effect shifts the end of the roll in a lateral direction, effectively steering the web in the proper direction to effect the necessary web correction.
    Type: Grant
    Filed: July 2, 1985
    Date of Patent: April 7, 1987
    Inventor: Kenneth S. DuFour