Combinational keyboard utilizing sequential operation of keys

Details Combinational keyboard utilizing sequential operation of keys Combinational keyboard utilizing sequential operation of keys

1982-09-22

1984-12-25

Burr, Edgar S.

Typewriting machines

Plural-key-actuated typewriter

400 94, 400482, 340365S, B41J 506

Patent

active

044900562

ABSTRACT:
U.S. Pat. No. 4,067,431 discloses a combinational keyboard in which keys are operated in combinations much as a piano is played. A combination being those keys which are depressed between two periods in which no keys are depressed. Each combination generates a coded character. The present invention covers a modification of this keyboard system in which the character keyed depends upon the sequence in which the keys of the combination are operated as well as upon the combination itself. The preferred system permits the character set of a six-key one-handed keyboard to be expanded to 198 characters. Cost of the keyboard--about sixty grams of silver.

REFERENCES:
patent: 3597600 (1971-08-01), Herendeen
patent: 3892915 (1975-07-01), Budworth et al.
patent: 4344069 (1982-08-01), Prame
patent: 4360892 (1982-11-01), Endfield

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