Patents by Inventor Robert Smilges

Robert Smilges 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).

  • Dual pilot counterbalance valve
    Patent number: 4338856
    Abstract: A counterbalance valve for controlling the flow of fluid from a hydraulic motor when a load is lowered has a pilot operated valve which modulates the flow of pressure fluid to and from a control port connected to main valve poppet to thereby set the opening of the poppet.
    Type: Grant
    Filed: June 30, 1980
    Date of Patent: July 13, 1982
    Assignee: Abex Corporation
    Inventors: Robert Smilges, Richard Wigmore
  • Counterbalance valve
    Patent number: 4244275
    Abstract: A hydraulic system for raising and lowering a load by means of a fluid motor includes a counterbalance valve which controls the flow of fluid to and from the motor. The counterbalance valve has a pilot operated metering orifice which passes fluid from the motor when the load is lowered and a compensator valve which maintains a fixed pressure differential across the metering orifice. This results in a fixed flow of fluid through the metering orifice when the load is lowered.
    Type: Grant
    Filed: January 15, 1979
    Date of Patent: January 13, 1981
    Assignee: Abex Corporation
    Inventor: Robert Smilges
  • Electrohydraulic flow control apparatus
    Patent number: 4236690
    Abstract: This invention relates to an electrically controlled flow control valve in which it is possible for the pilot fluid pressure which controls the main metering spool to build to full inlet pressure if necessary to initiate movement of the spool. An electrically operated solenoid operates a control poppet which regulates the pressure of the pilot fluid to position the metering spool.
    Type: Grant
    Filed: January 22, 1979
    Date of Patent: December 2, 1980
    Assignee: Abex Corporation
    Inventors: Robert Smilges, Richard Wigmore