Key switch assembly for a computer keyboard

Details Key switch assembly for a computer keyboard Key switch assembly for a computer keyboard

1999-02-02

1999-11-30

Scott, J. R.

Electricity: circuit makers and breakers

Electric switch details

Actuators

H01H 312, H01H 1370

Patent

active

059946555

ABSTRACT:
A key switch assembly includes a base board having an L-shaped slide retainer plate which defines a slide recess with the base board, and a pivot retainer unit. A membrane circuit layer is superimposed on the base board. A resilient layer is provided with an upright resilient member, and is superimposed on the membrane circuit layer. The membrane circuit layer and the resilient layer are formed with openings to permit extension of the slide retainer plate and the pivot retainer unit above the resilient layer. A scissors-type key cap support includes first and second support levers with intermediate portions that are coupled rotatably about a pivot axis. The first support lever has a lower portion retained pivotally on the base board by the pivot retainer unit. The second support lever has a slide shaft extending into the slide recess for slidable retention on the base board. A key cap is formed with a second pivot retainer unit for retaining pivotally an upper portion of the second support lever, and a second slide retainer unit for retaining slidably an upper portion of the first support lever. The key cap is biased upwardly by the upright resilient member, and is depressible to compress the resilient member.

REFERENCES:
patent: 5597067 (1997-01-01), Yoneyama
patent: 5763842 (1998-06-01), Tsai et al.
patent: 5767468 (1998-06-01), Tsai
patent: 5769210 (1998-06-01), Tsai
patent: 5770824 (1998-06-01), Tsai et al.
patent: 5878872 (1999-03-01), Tsai
patent: 5898145 (1999-04-01), Su

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