Method for manufacturing electrodes for a spark plug
US4840594A · kind A · utility
16Cited by
4References
7Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jun 6, 1988 |
| Grant date | Jun 20, 1989 |
| Priority date | — |
| Expiry date | Jun 6, 2008 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01T21/02
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A method of manufacturing for a spark plug (82) having a center electrode (80) and a side wire electrode (62) with a sphere of platinum (34, 68) mechanically retained in a cylindrical hole (34, 66) by an annular rib (40, 70) formed by a staking operation. Thereafter a force is applied that flattens the sphere (34, 66) to produce a disc (48, 72) which substantially covers the annular rib (40, 70) from exposure to the corrosive effects of gases in a combustion chamber.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.