Keyboard switch having dustproof and droplet-proof push-button

Details Keyboard switch having dustproof and droplet-proof push-button Keyboard switch having dustproof and droplet-proof push-button

1997-02-20

1998-10-13

Gellner, Michael L.

Electricity: circuit makers and breakers

Multiple circuit control

Multiple switch

200341, 200517, H01H 1370

Patent

active

058214828

ABSTRACT:
A keyboard switch having a dustproof and droplet-proof push-button includes an elastic tube having upper and lower open ends fastened to a slider capped with a keytop and a panel supporting the push-button, respectively, to prevent a dust or droplet of water from being sucked into a space under the slider connecting to an area where pressure sensitive electric switches are located. The elastic tube is collapsible telescopically when the keytop is pushed down, but recovering the original shape by its own elasticity when the pushing force on the keytop is removed. One embodiment of the present invention is one having another elastic member mounted between the slider and one of immobile members, which works predominantly in the final stage of the stroke of the keytop to protect the pressure sensitive electric switch from an excessive impact of tapping.

REFERENCES:
patent: 3829632 (1974-08-01), Klehm, Jr.
patent: 4596912 (1986-06-01), Hattori
patent: 4806908 (1989-02-01), Krupnik
patent: 5201824 (1993-04-01), Kato et al.
patent: 5396038 (1995-03-01), Yamada
patent: 5448026 (1995-09-01), Ozeki et al.
patent: 5456541 (1995-10-01), Ching-Shui
patent: 5512722 (1996-04-01), Ozeki et al.
Patent Abstracts of Japan, Pub. No. 1-119125, Aug. 11, 1989 (Nippon Denki KK).
Patent Abstracts of Japan, Pub. No. 07-114852, May 2, 1995 (Fujitsu Ltd).

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