Patents by Inventor Gerald Dean Barth

Gerald Dean Barth 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).

  • Apparatus for assembling a screw and compressible washer
    Patent number: 3981170
    Abstract: A method and apparatus for assembling a screw and an axially compressible washer and rolling threads on the screw blank in a single operation that results in a shank configuration immediately beneath the head of the screw that allows complete compression of the washer. The method involves assembling a washer on the blank and retaining it thereon while the washer and screw assembly are subjected to swaging forces from opposing reciprocating thread rolling dies. The washer is retained on the blank in such a manner as to allow the thread rolling dies to swage an upper section of the blank and thereafter move the washer upwardly directly adjacent the head in a single thread rolling pass.
    Type: Grant
    Filed: May 8, 1975
    Date of Patent: September 21, 1976
    Assignee: Illinois Tool Works Inc.
    Inventors: Gerald Dean Barth, David Prugh Wagner