Keyboard switch assembly having interchangeable cover plate, ind

Details Keyboard switch assembly having interchangeable cover plate, ind Keyboard switch assembly having interchangeable cover plate, ind

1976-06-04

1978-01-03

Scott, James R.

Electricity: circuit makers and breakers

Multiple circuit control

Multiple switch

174 66, 200159B, 200293, 200309, 235145R, H01H 900, H01H 1300

Patent

active

040668509

ABSTRACT:
A printed circuit keyboard assembly is disclosed comprising a waterproof jacket portion which includes a cover member overlying a sheet of raised key-tip portions, the jacket portion being releasably mounted to a position adjacent the waterproof switch matrix portion. Depression of a key-tip portion will result in the deflection of the switch matrix portion thereby generating binary coded signals representing the key-tip portion depressed. The cover member secured to the jacket portion is constructed to expose a predetermined number of key-tip portions for operation. Means are provided to releasably secure the jacket portion to a position adjacent the matrix portion to allow the interchanging of jacket portions each having different numbers of key-tip portions available for depression to meet changing business conditions.

REFERENCES:
patent: 1673724 (1928-06-01), Vickers
patent: 3438534 (1969-04-01), Zerwes
patent: 3551616 (1970-12-01), Juliusburger et al.
patent: 3560964 (1971-02-01), Bedell et al.
patent: 3585456 (1971-06-01), Phillips, Jr.
patent: 3591749 (1971-07-01), Comstock
patent: 3592979 (1971-07-01), Redman
patent: 3617660 (1971-12-01), Krakinowski
patent: 3823309 (1974-07-01), Caruso
patent: 3899101 (1975-08-01), Keating
patent: 3995126 (1976-11-01), Larson
Johnson, D. R., "Keyboard with Changeable Encoding and Key Designation", IBM Tech. Disc. Bull., vol. 13, No. 7, Dec. 1970, pp. 2041, 2042.

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