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

1985-02-25

1987-03-10

Marcus, Stephen

Electricity: circuit makers and breakers

Liquid contact

Time delay

200 76, 200 5A, 200340, H01H 916, H01H 1370

Patent

active

046492461

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:
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IBM Tech. Disc. Bulletin, vol. 13, No. 11, Apr. 1971, "Key for Elastic Diaphragm Switch Keyboards".
IBM Technical Disclosure Bulletin, "Touch Actuated Keyboard", vol. 18, No. 12, 1976.

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