Breakaway leafspring actuated keyswitch apparatus
US4480937A · kind A · utility
Inventor
Key dates
| Filing date | Aug 30, 1982 |
| Grant date | Nov 6, 1984 |
| Priority date | — |
| Expiry date | Aug 30, 2002 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01H13/7013
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A keyswitch apparatus for electronic typewriter keyboards and the like including a circuit board having at least one pair of electrical conductors, each conductor having contact means, at least one single-piece spring and contact system, each including a frame portion adapted for directly mounting to the circuit board and at least one spring and contact unit. Each spring and contact unit is associated with an associated pair of circuit board conductors, maintains direct electrical contact with the contact means of a first one of the conductors of the pair and includes a base section connected to the frame portion and bent into a longitudinal channel form, a leaf spring member cantilevered upwardly from the base section and having flat spring means urging the first extension section upwardly relative to the static board, and a contact member cantilevered downwardly from the base section for providing direct electrical contact with the contact means of the second one of the conductors of the pair when a pre-established downward force is exerted on the cantilevered end of the leaf spring member. The base and leaf spring member urge the second extension section apart from the contact m…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.