Device for preventing radio frequency interference from spark plug
US4465331A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 6, 1984 |
| Grant date | Aug 14, 1984 |
| Priority date | — |
| Expiry date | Jan 6, 2004 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S439/933
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A device for preventing radio frequency interference generated by spark plug of internal combustion engines. The device includes a cover member adapted to cover at least a part of the high-voltage portion of the spark plug such as high-tension cord together with the end of the plug connected to the cord. The cover member is made of a highly soft, flexible and electrically conductive rubber material (high molecular compound). The cover member is grounded through a grounding line to the body of the engine. This device is suitable for use in machines having limited space for mounting the radio frequency interference prevention device, such as chain saw having an internal combustion engine.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.