Patents by Inventor Dennis S. Zimpfer

Dennis S. Zimpfer 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).

  • Aircraft propeller assembly with blade pitch reset for ground idle
    Patent number: 5061153
    Abstract: An aircraft propeller has adjustable pitch blades which are reset from a low pitch in-flight idle position to a lower pitch ground idle position by a beta feedback and reset mechanism. The reset mechanism includes a set of cam elements supported for movement in response to rotation of the blades and positioned to engage a follower plate adjustably mounted on the beta feedback control rods.
    Type: Grant
    Filed: February 26, 1990
    Date of Patent: October 29, 1991
    Assignee: Hartzell Propeller Inc.
    Inventors: Loy D. Pace, Donald C. Stackhouse, Earl W. Jones, Dennis S. Zimpfer
  • Aircraft propeller assembly with blade pitch reset for ground idle
    Patent number: 4904157
    Abstract: An aircraft propeller has adjustable pitch blades which are reset from a low pitch in-flight idle position to a lower pitch ground idle position by a beta feedback and reset mechanism. The reset mechanism includes a set of cam elements supported for movement in response to rotation of the blades and positioned to engage a follower plate adjustably mounted on the beta feedback control rods.
    Type: Grant
    Filed: November 21, 1988
    Date of Patent: February 27, 1990
    Assignee: Hartzell Propeller Inc.
    Inventors: Loy D. Pace, Donald C. Stackhouse, Earl W. Jones, Dennis S. Zimpfer