Typewriting machines – Key-board or key lever-actuating mechanism – Key-board having multiple-character – multiple-movement keys
Patent
1982-09-22
1984-05-22
Crowder, Clifford D.
Typewriting machines
Key-board or key lever-actuating mechanism
Key-board having multiple-character, multiple-movement keys
400489, 400490, 200339, B41J 528, B41J 510, B41J 512
Patent
active
044498390
ABSTRACT:
A keyboard for a typewriter or the like including a series of elongate keys disposed in a row and normally with respect to the front edge of the typewriter or at an acute angle with respect thereto. Each of the keys is depressable when a finger pressure is applied on the center, home tablet surface of the key for causing the typing action of a certain letter; the key is depressable when the finger is reached to a tablet surface adjacent to the upper edge of the key and the key is then depressed to cause the typing action for another letter; and the key likewise provides a typing action for still another letter when the finger is reached downwardly toward the lower edge of the key to a lower tablet surface and the key is then depressed. Numerals may be typed either using separate numeral keys located in a separate row or may be typed by depressing the upper tablet surface on each of the elongate keys after using a shift key to cause the printing of the numeral instead of the letter for which the upper tablet surface is primarily dedicated.
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Nethken et al., "Dual-Function Key for Upper and Lower Print Control", IBM Technical Disclosure Bulletin, vol. 22, No. 7, Dec. 1979, pp. 2663-2664.
McCornack, "Single Keybutton Four-Way Switch", IBM Technical Disclosure Bulletin, vol. 21, No. 8, Jan. 1979, p. 3261.
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Advertisement on p. 22 of Personal Computing Magazine of Jun. 1982.
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