Keyboard switch system

Details Keyboard switch system Keyboard switch system

1974-12-09

1976-06-15

Habecker, Thomas B.

Communications: electrical

Audible indication

Percussion-type sound producer

340365R, 331117R, G08C 100

Patent

active

039640620

ABSTRACT:
A keyboard switch system for stenographic machines whereby electrical signals corresponding to key depression may be derived. The switch system is comprised of a plurality of coils each having a coil parameter effecting plunger coaxial therewith and spring loaded to an upper position. The coils are arranged in an assembly so as to be mountable in the stenographic machine with the plunger disposed so as to be contaced and depressed in response to depression of a respective key. Each of the coils form a part of a tuned circuit with plunger position affecting the resonant characteristics so as to create logic levels response to key position.

REFERENCES:
patent: 3648117 (1972-03-01), Yamamoto
patent: 3707686 (1972-12-01), Uekusa
patent: 3772684 (1973-11-01), Scantlin

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