Sheet metal screw
US4516893A · kind A · utility
34Cited by
20References
19Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Sep 29, 1982 |
| Grant date | May 14, 1985 |
| Priority date | — |
| Expiry date | Sep 29, 2002 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16B39/30
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A rotary fastener for use in attaching sheet metal or attaching articles to sheet metal. The fastener has a serrated helical ramp forged in the undersurface of the head during the heading operation. The serrations have generally radially oriented surfaces which engage workpiece material to increase strip torque, removal torque or both. The ramp advances helically in an axial direction and the ramp is spiral in cross-section.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.