Keyboard switch assembly having internal gas passages preformed in spacer member
US4046975A · kind A · utility
190Cited by
9References
9Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Sep 22, 1975 |
| Grant date | Sep 6, 1977 |
| Priority date | — |
| Expiry date | Sep 22, 1995 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01H2229/028
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
Sealed keyboard sandwich having actuator means, a plurality of contactor means, a plurality of contact means and support means therefore, said contacts and contactors forming a plurality of key units, and gas passage means positioned between said actuator means and said support means for selectively permitting the flow of trapped gas from the key units upon depression of a portion thereof. In the preferred structure the sandwich is hermetically sealed from the outside atmosphere.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.