David C Hempfling, Age 55Hoffman Estates, IL
David Hempfling Phones & Addresses
Hawthorn Woods, IL
2433 Cullom Ave, Chicago, IL 60618 (773) 516-4091 (773) 754-0364
Itasca, IL
Hawthorn Woods, IL
Mentions for David C Hempfling
Publications & IP owners
Us Patents
Fastener Having Multiple Lobed Thread
US Patent:
2002019, Dec 19, 2002
Filed:
Mar 12, 2002
Appl. No.:
10/095404
Inventors:
Kenneth LeVey - West Chicago IL, US
David Hempfling - Chicago IL, US
David Hempfling - Chicago IL, US
International Classification:
F16B035/04
US Classification:
411/411000
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.
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