Patents by Inventor Dwight H. Matthews

Dwight H. Matthews 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).

  • Manual override assembly for pilot-operated valve
    Patent number: 6902143
    Abstract: In a pilot-operated valve having a valve body, including inlet and outlet portions controllably interconnected via a main piston bore portion; a main piston movable within the main piston bore; an operator portion; an operator assembly including a movable plunger assembly; and an actuating mechanism for actuating the plunger assembly, wherein the improvement comprises a further bore located within the valve body and a manually-operated override assembly retained therein, including a stem having a tool actuating portion; a cam portion extending radially into the operator bore portion and, upon a first predetermined rotation physically actuating the plunger assembly; and an actuating surface extending tangentially into the main piston bore portion which, upon a second rotation physically actuates the main piston. A method of actuating the manual override assembly is also set forth.
    Type: Grant
    Filed: July 18, 2003
    Date of Patent: June 7, 2005
    Assignee: Parker-Hannifin Corporation
    Inventors: Robert Domke, Kevin Wilson, Dwight H. Matthews
  • Manual override assembly for pilot-operated valve
    Publication number: 20040144941
    Abstract: In a pilot-operated valve having a valve body, including inlet and outlet portions controllably interconnected via a main piston bore portion; a main piston movable within the main piston bore; an operator portion; an operator assembly including a movable plunger assembly; and an actuating mechanism for actuating the plunger assembly, wherein the improvement comprises a further bore located within the valve body and a manually-operated override assembly retained therein, including a stem having a tool actuating portion; a cam portion extending radially into the operator bore portion and, upon a first predetermined rotation physically actuating the plunger assembly; and an actuating surface extending tangentially into the main piston bore portion which, upon a second rotation physically actuates the main piston. A method of actuating the manual override assembly is also set forth.
    Type: Application
    Filed: July 18, 2003
    Publication date: July 29, 2004
    Inventors: Robert Domke, Kevin Wilson, Dwight H. Matthews