Patents by Inventor Adolf Volkmann

Adolf Volkmann 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).

  • Patent number: 4027890
    Abstract: A pair of upright post-like brake shoes extend down through apertures in a skateboard body member in slidable relation directly over a pair of the wheels, and the shoes are secured at their upper ends to a top cross plate arranged to be pushed downwardly by the skateboard operator to move the bottom ends of the shoes into engagement with the surface of the wheels for applying the brakes. A resilient retracting member holds the brake shoes normally above the wheels in a nonbraking position.
    Type: Grant
    Filed: April 12, 1976
    Date of Patent: June 7, 1977
    Inventor: Adolf Volkmann