Press fit fastener and method of producing it
US7153075B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 8, 2003 |
| Grant date | Dec 26, 2006 |
| Priority date | — |
| Expiry date | Mar 19, 2024 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16B4/004
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A press fit fastener (1) includes a shank (2), a head (3) and a press fit portion (4) being located at the shank (2). The head (3) is located at the first end of the shank (2). The press fit portion (4) includes a multiple helical profile (5). The helical profile (5) has a beginning portion (6) and an inclination portion (8). The outer diameter of the inclination portion (8) is designed to increase in a direction towards the head (3) to reach a maximum outer diameter. The maximum outer diameter of the inclination portion (8) is spaced apart from the head (3). The method of producing the press fit fastener (1) includes the steps of cold forming a press fit portion (4) at the shank (2) of the fastener (1) to produce a cylindrical helical profile (5) including a plurality of pitches, and calibrating the helical profile (5) without producing chips to produce an inclination portion (8) in which the outer diameter of the press fit portion (4) in a direction towards the head (3) increases to reach the maximum outer diameter. The maximum outer diameter of the inclination portion (8) being spaced apart from the head (3).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.