Keyboard for initiating switching operations or switching signal

Details Keyboard for initiating switching operations or switching signal Keyboard for initiating switching operations or switching signal

1983-05-05

1985-07-23

Marcus, Stephen

Electricity: circuit makers and breakers

Electric switch details

Indicators

200 5A, 200159B, 200340, H01H 916

Patent

active

045310335

ABSTRACT:
A keyboard for initiating switching functions or switching signals. Synchronizing pins coupled to four key members at the mutually adjacent crossing between them cause actuation of contact sets upon depression of the keyboard surface above each synchronizing pin. Actuation of at least two contact sets are necessary to initiate a switching function corresponding to the keyboard symbol at the position of surface depression. A light may be employed to visually indicate the symbol actuated.

REFERENCES:
patent: 2261115 (1941-11-01), Hofgaard
patent: 2730248 (1956-01-01), Van Waert
patent: 4060703 (1977-11-01), Evert, Jr.
patent: 4092777 (1977-08-01), Bequaert et al.
patent: 4129758 (1978-12-01), Gilano et al.
patent: 4322587 (1982-03-01), Burns et al.
patent: 4366355 (1982-12-01), Oelsch
patent: 4367384 (1983-01-01), Waarle
patent: 4400593 (1983-08-01), Kunz
IBM Tech. Disc. Bull. vol. 13, No. 11, Apr. 71.

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