Electricity: circuit makers and breakers – Multiple circuit control – Sequential operations
Patent
1983-02-18
1985-05-14
Fuller, Benjamin R.
Electricity: circuit makers and breakers
Multiple circuit control
Sequential operations
200 5A, 200DIG1, 235145R, H01H 900, H01H 1370
Patent
active
045174210
ABSTRACT:
An array of fluid filled cells bearing symbols on their faces transmit applied pressure or displacement to a remote end of the cell which have a mating array of electrical switches normally maintained in an open position. Pressure or displacement of the upper surface of the cell is transmitted to the lower surface to operate (close) the switch. Upon removal of the applied pressure, the cell returns to its initial position. A second embodiment of the invention shows an entirely modular key formed from a rubber-like material or from a self-skin foam material such as a polyurethane. The modular key has the keyface, body and switch elements formed integrally so that the keys can be added to a premated matrix. Still another embodiment of the present invention shows a totally sealed electronic terminal or device which is specially adapted to accept the modular keys.
REFERENCES:
patent: 3584162 (1970-06-01), Krakinowski
patent: 3860771 (1975-01-01), Lynn et al.
patent: 3940758 (1976-02-01), Margolen
patent: 4032729 (1977-06-01), Koistinen
patent: 4090045 (1978-05-01), Marsh
patent: 4227071 (1980-10-01), Tomyn
IBM Technical Disclosure Bulletin, "Keyboard Switch With Stroke _and Feedback Enhancement Using Vertically Conducting Elastomer in a _Laterally Conducting Mode", vol. 20, No. 5, Oct. 1977.
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