Membrane keyboard blockout apparatus

Details Membrane keyboard blockout apparatus Membrane keyboard blockout apparatus

1988-05-02

1989-04-11

Scott, J. R.

Electricity: circuit makers and breakers

Switch activation inhibitor

Actuator blocking device

200 4319, 200 5A, 235145R, 400472, H01H 928, H01H 1370, B41J 500, G06C 700

Patent

active

048208876

ABSTRACT:
A membrane keyboard blockout apparatus for a keyboard having an array of a plurality of flexible key members in respective ones of a plurality of apertures arranged in a grid forming the keyboard includes a cover plate dimensioned to span a flexible key member and to provide a tight fit within an aperture defining a key member. The cover plate has a thickness providing a substantially inflexible configuration in response to normal operator manipulation and a plurality of corner support pedestals contacting respective corners of the flexible key member when the cover plate is inserted in a key member aperture. Thus, the pedestals provide a support between the cover plate and the flexible key member at the edges of the key member to preclude, in combination with the inflexible structural characteristic of the cover, an actuation of the flexible key member under the cover.

REFERENCES:
patent: 3333069 (1967-07-01), Anderson
patent: 3860711 (1975-01-01), Lynn et al.
patent: 3906814 (1975-09-01), Magnussen
patent: 4497987 (1985-02-01), Melys

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