Fastner having multiple-bossed lead
US6899500B2 · kind B2 · utility
5Cited by
35References
44Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jun 19, 2001 |
| Grant date | May 31, 2005 |
| Priority date | — |
| Expiry date | Jun 19, 2021 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB21H3/027
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
A threaded fastener includes a lead having bosses separated from one another by bases along the thread crest. Two such leads may be formed such that lead-in profiles for of one lead are disposed at locations corresponding to locations of lead-out profiles for the other lead. The lead-in and lead-out profiles of the bossed, and other features of the bosses and bases may differ from one another along the fastener shank. 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.