Electricity: circuit makers and breakers – Electric switch details – Actuators
Patent
1998-07-20
1999-10-12
Scott, J. R.
Electricity: circuit makers and breakers
Electric switch details
Actuators
H01H 312
Patent
active
059643412
ABSTRACT:
A key switch assembly includes a base board having a spaced pair of upwardly projecting slide retainer plates, a spaced pair of upwardly projecting pivot retainer plates, and a stop projection. A membrane circuit layer and an insulating layer are superimposed on the base board, and are formed with aligned openings to permit extension of the slide retainer plates, the pivot retainer plates and the stop projection therethrough. The insulating layer is made of a first material, and is formed with a through hole surrounded by the openings. An upright hollow biasing member, made of a second material different from the first material, is disposed on the insulating layer, and has a bottom end fixed to a periphery of the through hole in the insulating layer. The first material is less resilient and less susceptible to deformation than the second material. 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. A key cap abuts against a top end of the biasing member, and is depressible to compress the biasing member.
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