Rotary fastener with anti-strip-out nibs
US5183359A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 12, 1992 |
| Grant date | Feb 2, 1993 |
| Priority date | — |
| Expiry date | May 12, 2012 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S411/959
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A torque-absorbing rotary threaded fastener for joining metal panels has a stripping torque sufficiently in excess of its driving torque to ensure that it will be relatively unlikely to be stripped when mechanically driven home. The fastener has a clamping face which includes a number of polyhedral nibs extending axially therefrom and separated from one another by substantially planar uninterrupted portions of the clamping face. The nibs include a leading wall and a trailing wall, facing in the direction of tightening and opposite thereto, respectively. The leading wall may be inclined at a steeper angle with respect to the plane of the clamping face than is the trailing wall, or vice versa. The leading wall and the trailing wall meet to form an apex which is also inclined with respect to the plane of the clamping face, so that the nibs increase in axial height as one views outward toward the periphery of the clamping face.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.