US PATENT SUBCLASS 400 / 473
.~ Including mechanism (e.g., auxiliary key-board) for activating keys

Current as of: June, 1999
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400 /   HD   TYPEWRITING MACHINES

472  DF  KEY-BOARD OR KEY LEVER-ACTUATING MECHANISM {12}
473.~ Including mechanism (e.g., auxiliary key-board) for activating keys {3}
474  DF  .~.~> Electromagnetic key-board-drive mechanism
475  DF  .~.~> Operated by user's leg (e.g., foot, knee, etc.)
476  DF  .~.~> For actuating function key only

DEFINITION

Classification: 400/473

Including mechanism (e.g., auxiliary key-board) for activating keys:

(under subclass 472) Subject matter wherein a typewriter is provided with means that cause the key* elements of a typewriter key-board* to be pressed successively.

(1) Note. A distinction is made between a key-board having keys that are contacted by the fingers of a typist, and an auxiliary or additional key-board having elements that in effect substitute for the fingers of a typist. The auxiliary key-board may be used when it is desired to use a typewriter having a standard key-board arrangement by overlying the standard key-board with the auxiliary key-board having a different key-board arrangement. The auxiliary key-board converts the pressings of the keys thereon into pressings of the keys of the standard key-board so that a typist familiar with the arrangement of the auxiliary key-board will be able to use a standard key-board typewriter. The auxiliary key-board may also be used to a) convert the key-board of a manually powered typewriter to the key-board of a power-operated typewriter (e.g., an "input" typewriter), (b) provide the keyboard of a manually powered typewriter with the capability of sending electrical signals (e.g., an "output" typewriter, (c) convert the key-board of a cryptos:graphic typewriter, or (d) provide a standard key-board for the typist when the keyboard of the typewriter is not standard.