Key switch assembly for a computer keyboard

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

1998-02-26

1999-03-09

Scott, J. R.

Electricity: circuit makers and breakers

Electric switch details

Actuators

H01H 312, H01H 1370

Patent

active

058788727

ABSTRACT:
A key switch assembly includes a base board having a spaced pair of slide retainer plates which project upwardly from the base board and which define slide recesses with the base board, and a spaced pair of pivot retainer plates which project upwardly from the base board. A stop projection projects upwardly from the base board and is disposed between the pivot retainer plates. The stop projection is disposed posteriorly of the pivot retainer plates to define a clearance between the stop projection and rear sides of the pivot retainer plates. A membrane circuit layer is superimposed on the base board, and a resilient layer is superimposed on the membrane circuit layer and is provided with an upright resilient member. A scissors-type key cap support includes first and second support levers with upper and lower portions, and intermediate portions that are coupled rotatably about a pivot axis. The first support lever has a rearwardly projecting tab which abuts turnably against the stop projection on the base board. A 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.

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