Patents by Inventor David C. Hempfling

David C. Hempfling 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).

  • Fastener having multiple lobed thread
    Patent number: 7101134
    Abstract: A threaded fastener includes a lead having bosses separated from one another by bases along the thread crest. The lead-in and lead-out profiles of the bosses, and other features of the bosses and bases may differ from one another along the fastener shank. The lead-in and lead out profiles may have linear and non-linear surfaces. The lead-in and lead-out profiles may have cutting edges angled toward the direction of propagation of the bosses. The boss profiles may be selected to reduce insertion torque and to provide excellent resistance to pullout. The fastener may be formed by roll threading via a tool made by a plunge EDM process.
    Type: Grant
    Filed: March 12, 2002
    Date of Patent: September 5, 2006
    Assignee: Illinois Tool Works Inc.
    Inventors: Kenneth LeVey, David C. Hempfling
  • Fastener having multiple lobed thread
    Publication number: 20020192051
    Abstract: A threaded fastener includes a lead having bosses separated from one another by bases along the thread crest. The lead-in and lead-out profiles of the bosses, and other features of the bosses and bases may differ from one another along the fastener shank. The lead-in and lead out profiles may have linear and non-linear surfaces. The lead-in and lead-out profiles may have cutting edges angled toward the direction of propagation of the bosses. The boss profiles may be selected to reduce insertion torque and to provide excellent resistance to pullout. The fastener may be formed by roll threading via a tool made by a plunge EDM process.
    Type: Application
    Filed: March 12, 2002
    Publication date: December 19, 2002
    Inventors: Kenneth LeVey, David C. Hempfling