Patents by Inventor David E. Chivens

David E. Chivens 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).

  • Stress sensor for yield-point detection in a stretch press
    Patent number: 4501135
    Abstract: A system for sensing tensile stress in a metal sheet being stretch formed between gripping jaws in a stretch press. Reaction force of the stressed sheet causes elastic deformation of each jaw, and this deformation is detected by movement of a light beam emitted from a source secured to the jaw. A photosensor output signal related to light-beam movement is correlated with a second signal representing sheet strain or elongation to detect when the sheet has been tensioned to the yield point.
    Type: Grant
    Filed: February 9, 1982
    Date of Patent: February 26, 1985
    Assignee: L & F Industries
    Inventors: David E. Chivens, Laramie J. Cloward