Keyboard construction

Details Keyboard construction Keyboard construction

1978-06-12

1980-07-01

Scott, James R.

Electricity: circuit makers and breakers

Multiple circuit control

Multiple switch

H01H 926

Patent

active

042107873

ABSTRACT:
A keyboard in which pressing of a key displaces balls in a row and in a column of ball filled channels in a flat member, is further provided with a printed circuit board on which are mounted contact springs and the circuit pattern on the PC-board connects the contacts to an output cable. The PC-board is mounted to the keyboard case as bottom to thereby place the contact springs into the operating range of the displaced balls.

REFERENCES:
patent: 2482998 (1949-09-01), Andersson
patent: 3339117 (1967-08-01), Fisher
patent: 3470332 (1969-09-01), Milner et al.
patent: 3681555 (1972-08-01), Ohkita
patent: 3836736 (1974-09-01), Golbeck
patent: 3845255 (1974-10-01), Zielke
patent: 3903381 (1975-09-01), Diehr
patent: 4140883 (1979-02-01), Zielke

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