Fastening element
US7850409B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 26, 2008 |
| Grant date | Dec 14, 2010 |
| Priority date | — |
| Expiry date | Apr 17, 2029 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16B25/0052
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A fastening element has a shaft (12), and a tapping thread (21) carried by the shaft (12) and having at least one screw thread (22, 42) a section (23; 43) of which that adjoins the thread pilot (35), having a plurality of following one another thread steps (24, 25, 26, 27; 44, 45, 46, 47) having different cross-sections, with a cross-section of the at least one screw thread (22; 42) decreasing stepwise toward the thread pilot (35) from a thread step (24, 25, 26, 27; 44, 45, 46, 47) to a thread step (24, 25, 26, 27; 44, 45, 46, 47), with the thread steps (24, 25, 26, 27; 44, 45, 46, 47) having respective cutting edge-forming end surfaces (28, 29, 30, 31; 48, 49, 50, 51) aligned, at least partially, in a direction of the thread pilot (35).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.