Fastener having multiple lobed thread
US7101134B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 12, 2002 |
| Grant date | Sep 5, 2006 |
| Priority date | — |
| Expiry date | Oct 3, 2022 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB21H3/027
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.