Typewriting machines – Key-board or key lever-actuating mechanism – Key-cap or key-stem structure
Patent
1984-03-05
1986-01-21
Wright, Jr., Ernest T.
Typewriting machines
Key-board or key lever-actuating mechanism
Key-cap or key-stem structure
4004913, B41J 512
Patent
active
045654603
ABSTRACT:
A keyface for increasing the speed and accuracy of an operator of any key-operated or touch-operated system is adapted to be attached in a keystem of a keyboard. The keyboard is equipped with a plurality of keystems arranged in a predetermined order, and each keystem has a contoured surface area which normally faces upwardly. The keyface is made up of a element which has an operative upper convex surface of a prearranged surface area, and an operative lower surface adapted to be attached to the contoured surface area of the keystem. The lower surface area defines an area substantially matching at least a portion of the contoured surface area of the keystem. The element is dimensioned so as to be free from interfering with a similar element attached to a neighboring keystem of the keyboard.
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IBM Technical Disclosure Bulletin, "Braille Display Portable Electronic Calculator", Heath, vol. 23, No. 4, Sep. 1980, pp. 1727-1731.
Teltscher Erwin S.
Wright, Jr. Ernest T.
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