Patents by Inventor David F. Schaefer

David F. Schaefer 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).

  • Undercarriage support for a track chain
    Patent number: 10351186
    Abstract: An undercarriage includes a plurality of bottom support rollers defining a bottom support roller platform distance and front and rear wheels defining a wheel pitch distance, and a track chain defining a link pitch distance and a ratio of the bottom support roller platform distance to the wheel pitch distance ranges from 0.70 to 0.95 and a ratio of the roller spacing distance to the link pitch distance ranges from 0.75 link pitch distance to 1.50 link pitch distances.
    Type: Grant
    Filed: December 30, 2017
    Date of Patent: July 16, 2019
    Assignee: Caterpillar Inc.
    Inventors: Luke B. Fischer, David F. Schaefer
  • Undercarriage Support for a Track Chain
    Publication number: 20190202509
    Abstract: An undercarriage includes a plurality of bottom support rollers defining a bottom support roller platform distance and front and rear wheels defining a wheel pitch distance, and a track chain defining a link pitch distance and a ratio of the bottom support roller platform distance to the wheel pitch distance ranges from 0.70 to 0.95 and a ratio of the roller spacing distance to the link pitch distance ranges from 0.75 link pitch distance to 1.50 link pitch distances.
    Type: Application
    Filed: December 30, 2017
    Publication date: July 4, 2019
    Applicant: Caterpillar Inc.
    Inventors: Luke B. Fischer, David F. Schaefer
  • Apparatus and method to reduce vibrations on a tracked work machine
    Patent number: 7806209
    Abstract: An apparatus and method for reducing vibrational effects of track chain assembly catenary hang is disclosed. A work machine includes a pair of track roller assemblies one positioned on each side of the work machine. The vibration reducing apparatus and method includes repositioning undercarriage components to vary the catenary hang from one side of the work machine to the other.
    Type: Grant
    Filed: January 10, 2006
    Date of Patent: October 5, 2010
    Assignee: Caterpillar Inc
    Inventors: Michael R. Standish, James M. Hollister, Margaret M. Lamb, Roy L. Maguire, Thomas E. Oertley, Roger L. Recker, David F. Schaefer