Patents by Inventor David L. Sigl

David L. Sigl 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).

  • Selectable detent relief valve
    Patent number: 6976504
    Abstract: A selectable detent relief valve of this invention is used to operate a hydraulic detent mechanism on a manually operated spool valve. This design has three modes of operation, no-detent, continuous detent and kick-out detent. The no-detent position allows flow to pass through the relief valve, from a first port to a second port and bypass the relief function. The pressure created, disengages the detent mechanism in the spool valve. The spool always returns to neutral position as long as pressure is present. The continuous detent position blocks the flow from a first port to a second port. The kick-out detent position allows flow to pass from the first port to the second port to override (kick-out) the detent mechanism in the spool when the pressure is greater than 2600 psi.
    Type: Grant
    Filed: April 18, 2003
    Date of Patent: December 20, 2005
    Assignees: Sauer-Danfoss Inc., Deere and Company
    Inventors: Dennis O. Courtright, John P. Tow, David L. Sigl
  • Selectable detent relief valve
    Publication number: 20040206407
    Abstract: A selectable detent relief valve of this invention is used to operate a hydraulic detent mechanism on a manually operated spool valve. This design has three modes of operation, no-detent, continuous detent and kick-out detent. The no-detent position allows flow to pass through the relief valve, from a first port to a second port and bypass the relief function. The pressure created, disengages the detent mechanism in the spool valve. The spool always returns to neutral position as long as pressure is present. The continuous detent position blocks the flow from a first port to a second port. The kick-out detent position allows flow to pass from the first port to the second port to override (kick-out) the detent mechanism in the spool when the pressure is greater than 2600 psi.
    Type: Application
    Filed: April 18, 2003
    Publication date: October 21, 2004
    Applicant: SAUER-DANFOSS INC.
    Inventors: Dennis O. Courtright, John P. Tow, David L. Sigl