Fastener joint and method thereof
US4118134A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 8, 1974 |
| Grant date | Oct 3, 1978 |
| Priority date | — |
| Expiry date | Apr 8, 1994 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T403/7028
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
A fastener joint assembly and method for joining the crank arm plate to the pivot shaft in a vehicular windshield wiper crank arm assembly. A varying sized opening formed in the crank plate engages a corresponding knurl on the shaft. The opening is formed by providing a punch and an enlarged die member so that as the opening is pierced, the material at the lower portion of the opening at the enlarged die opening breaks out forming a larger diameter opening at the bottom of the plate. The root diameter of the knurled portion of the shaft corresponds generally to the smaller diameter opening in the plate. The larger diameter portion of the plate opening corresponds generally to the outer diameter of the knurl. As the shaft is driven into the plate at the smaller opening, the material surrounding the smaller opening flows into the larger diameter portion and the knurl forms a positive connection between the shaft and the plate.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.