Patents by Inventor Jon A. Hjertberg

Jon A. Hjertberg 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).

  • Bicycle spoke tensiometer
    Patent number: 4706508
    Abstract: A tool for determining bicycle spoke tension consisting of two identical members pivoting in a scissors-like manner upon a screw retained sleeve. The two members are maintained at rest in a juxtaposed position by a spring in the center of the tool. The two members are forced apart and then permitted to close over a spoke. The tool not only grips the spoke, but it also deflects the spoke. A vernier scale is affixed to the tool which allows measuring spoke tension as a function of the amount of deflection.
    Type: Grant
    Filed: November 8, 1985
    Date of Patent: November 17, 1987
    Assignee: Wheelsmith, Inc.
    Inventors: Eric A. Hjertberg, Jon A. Hjertberg