Electric keyboard of snap-contact type

Details Electric keyboard of snap-contact type Electric keyboard of snap-contact type

1978-05-19

1980-04-29

Stephan, Steven L.

Electricity: circuit makers and breakers

Liquid contact

Time delay

200 5A, 200275, B41B 902, H01H 106

Patent

active

042007780

ABSTRACT:
A keyboard comprises a plurality of keys which, when depressed, elastically deform conductive laminae which thereby go with a snap action from a stable configuration to an unstable configuration to complete an electrical circuit associated thereto. Each lamina has the form of two mutually transverse pairs of parallel edge strips spanned by a diagonal strip and the edge strips have permanent bends set into them such that the diagonal strip is bowed in the stable configuration towards the corresponding key. A fixed contact on the lamina is located adjacent one end of the diagonal strip and a movable contact is located in the central region of the diagonal strip. A single key actuates two identical laminae, one through an actuator resiliently coupled to the key and the other through an actuator fixed to the key.

REFERENCES:
patent: 3800104 (1974-03-01), Lien et al.
patent: 3899648 (1975-08-01), Murata
patent: 4084071 (1978-04-01), Smith
patent: 4118610 (1978-10-01), Purssell et al.

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