Process for manufacturing a captive screw
US6086480A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 28, 1999 |
| Grant date | Jul 11, 2000 |
| Priority date | — |
| Expiry date | Apr 28, 2019 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16B5/0208
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
A method of making a knob and ferrule for a captive screw is disclosed, the knob integrally attached to the screw, the ferrule attachable to a panel. The method of making the knob includes providing an aluminum alloy base metal for the knob, pressing by cold-forming the base material into a generally cylindrical cup-shaped article using at least one pressing operation, the cup having a generally cylindrical side wall, removing any base material situated outside the perimeter of the cup-shaped cylindrical article, and providing a hole in the bottom of the cup, coaxial with the hollow cylindrical walls of the cup, thereby forming the knob. The method of making the ferrule includes providing a metal base material for the ferrule, pressing the base material, by cold-forming, into a cylindrical article using at least one pressing operation, the cylindrical article having a cylindrical side wall having an outer surface, cold-forming an attachment device an end of the ferrule; and removing any base material situated outside the perimeter of the cylindrical article, thereby forming the ferrule. All major parts of the captive screw, including the knob, ferrule and screw may be cold formed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.