Die for, method of making, and fastener with lobed primary thread lead and interposed dual auxiliary thread lead with improved substrate entry end portion
US7156600B2 · kind B2 · utility
61Cited by
43References
40Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 13, 2004 |
| Grant date | Jan 2, 2007 |
| Priority date | — |
| Expiry date | Aug 28, 2024 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB21H3/027
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
A threaded fastener comprises a first, primary thread lead, and a pair of second, auxiliary thread leads alternatively interposed between successive threads of the first, primary thread lead, except within the vicinity of the tip portion of the fastener so as to define space for accommodating debris generated during the self-tapping of the fastener into a workpiece. The fastener also comprises lobe members formed upon the primary thread lead so as to predeterminedly affect torque insertion and pull-out resistance values.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.