Structure of key switch
US5283408A · kind A · utility
56Cited by
6References
2Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Aug 4, 1992 |
| Grant date | Feb 1, 1994 |
| Priority date | — |
| Expiry date | Aug 4, 2012 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01H2233/036
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A key switch includes a rectangular key cap having a unitary, hollow, rectangular plunger inserted into a rectangular hole on a key base and pressed to squeeze a rubber tone causing a conductor to electrically connect a contact on the printed circuit board of a keyboard, wherein the rectangular plunger has four circular rails on the four corners thereof along its length respectively inserted in four circular grooves on the rectangular guide slot of the key base for stable movement, and two smoothly curved, hooked spring plates releasably hooked with two opposite hooked portions on the key base for positioning.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.