Keyboard with mechanical encoding

Details Keyboard with mechanical encoding Keyboard with mechanical encoding

1978-03-03

1979-09-11

Scott, James R.

Electricity: circuit makers and breakers

Multiple circuit control

Multiple switch

200 50C, H01H 926

Patent

active

041676572

ABSTRACT:
A keyboard has column channels and row channels filled with displacement balls and having trough-like, semicircular cross-sections; this bottom contour of the channels is continued right into the intersection so that balls when displaced by key depressing will be retained in the respective channel, and not be deflected into any intersecting channel, so that the each key is positively identifiable by two switch closings, the switches being disposed for actuation at one end each of these channels.

REFERENCES:
patent: 679310 (1901-07-01), Hall
patent: 2482998 (1949-09-01), Andersson
patent: 3470332 (1969-09-01), Milner et al.
patent: 3551611 (1970-12-01), Fechner
patent: 3845255 (1974-10-01), Zielke
patent: 3903381 (1975-09-01), Diehr
patent: 4140883 (1979-02-01), Zielke

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