Patents by Inventor Hans J. Schwerdhoefer

Hans J. Schwerdhoefer 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).

  • Chain thrower mechanism for bicycle gear change
    Patent number: 5190500
    Abstract: In a chain thrower mechanism of a bicycle derailleur gear mechanism a parallelogram linkage is formed from plastics material at least part of the joints of which are plastic film hinges.
    Type: Grant
    Filed: October 8, 1991
    Date of Patent: March 2, 1993
    Assignee: Fichtel & Sachs AG
    Inventor: Hans J. Schwerdhoefer
  • Method of manufacturing bicycle chain thrower mechanism
    Patent number: 5190501
    Abstract: In a chain thrower mechanism of a bicycle derailleur gear mechanism a parallelogram is formed by at least four parts. One of these parts is prefabricated by injection moulding with respective hinge portions. A second of these parts is formed with respective hinge portions by using one hinge portion of the prefabricated part as a shape-giving part for injection moulding of the other part.
    Type: Grant
    Filed: October 8, 1991
    Date of Patent: March 2, 1993
    Assignee: Fichtel & Sachs AG
    Inventor: Hans J. Schwerdhoefer