"Momentary ""on"" switch suitable for keyboards"
US5115106A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 15, 1991 |
| Grant date | May 19, 1992 |
| Priority date | — |
| Expiry date | Mar 15, 2011 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01H2239/006
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A momentary contact switch suitable for use in an electrical keyboard has cylindrical projections projecting from a baseplate with axial bores into which projections of the keys fit and by which are guided and retained. A resilient boot interposed between each key and the baseplate and surrounding the cylindrical projections bears against the underside of the key to keep its switch unclosed except when force is applied to an actuation surface of the key. A movable contact internal to the boot is transported by actuation of the key to make electrical contact with a fixed contact adjacent the cylindrical projection. In a preferred embodiment the fixed and movable contacts both have the shape of a ring and encircle the cylindrical projection. The movable contact in the preferred embodiment further is formed on a resilient surface of the boot.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.