Patents by Inventor Robert J. Dooley

Robert J. Dooley 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).

  • Dual-stage tapered leaf spring for a trailer
    Patent number: 5209518
    Abstract: The present invention discloses a lightweight dual-stage tapered leaf spring assembly for use in heavy-duty trailer suspension applications. The dual-leaf tapered leaf spring assembly has a main or first tapered leaf defining a first stage rate and a second tapered leaf operable to define a second stage rate. The first and second leafs are formed to include a tapered thickness profile which closely approximates a true modified parabolic taper. The "approximated" modified parabolic profiles for each of the main and second leafs are adapted to provide a smooth non-linear transition between the first and second stage rates.
    Type: Grant
    Filed: March 11, 1991
    Date of Patent: May 11, 1993
    Assignee: Detroit Steel Products Co., Inc.
    Inventors: Mark A. Heckenliable, Dewayne B. Williams, Robert J. Dooley