Plastic headed fastener assembly
US4041834A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 24, 1976 |
| Grant date | Aug 16, 1977 |
| Priority date | — |
| Expiry date | Aug 24, 1996 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S411/919
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A threaded fastener unit and driver system for maximizing driving force distribution, the fastener unit having a composite head section comprised of a thin-walled uniform thickness plastic coating covering all surfaces of an enlarged head portion on a drilling or tapping device. The composite head includes internal torque transmitting surfaces formed by slots intersecting at generally right angles to one another forming four upstanding posts with a radially extending flange at the base of the posts. The fastener unit is configured so that the driving force distribution is maximized to eliminate damage to the plastic during installation of the fastener in a workiece.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.