Switch mat

Details Switch mat Switch mat

1997-03-05

1999-02-23

Luebke, Renee S.

Electricity: circuit makers and breakers

Solid contact

Membrane type

H01H 1370

Patent

active

058747001

ABSTRACT:
This invention relates to a switch mat with key switches. In previously disclosed switch mats, switch chambers located under dome-shaped key caps were jointly vented. This affected key operation, and allowed soiling by dust and moisture. Here, each switch chamber has a ventilating channel with a filter layer that is permeable to air, for venting to and from the outside. In this design, the filter layer is formed by a filter matting that is dust and moisture-repellent. Because each switch chamber is separately vented to and from the outside, there is no mutual influence on operating forces of the key switches.

REFERENCES:
patent: 3683600 (1972-08-01), Rice
patent: 3888117 (1975-06-01), Lewis
patent: 3898421 (1975-08-01), Suzumura
patent: 4485279 (1984-11-01), Nakamura

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