Radiused lead-in for interference fit fasteners
US10641307B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 20, 2017 |
| Grant date | May 5, 2020 |
| Priority date | — |
| Expiry date | Jun 20, 2037 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16B35/041
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
An assembly comprising first and second structural elements having aligned holes, an fastener that occupies at least respective portions of the holes without a surrounding sleeve, and a mating part that is coupled to the fastener. The fastener comprises: a head; a circular cylindrical shank extending from the head; a mating portion comprising external projections; and a transition portion disposed between the shank and the mating portion. The transition portion comprises a first radiused lead-in section that meets the shank at a shank/lead-in intersection and a second radiused lead-in section that meets the first radiused lead-in section. The first radiused lead-in section curves gradually in a first axial direction toward the mating portion and has a first profile that is a circular arc having a first radius, while the second radiused lead-in section curves abruptly in the first axial direction and has a second profile that is a circular arc having a second radius which is much smaller than the first radius.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.