US PATENT SUBCLASS 400 / 472
KEY-BOARD OR KEY LEVER-ACTUATING MECHANISM

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

472KEY-BOARD OR KEY LEVER-ACTUATING MECHANISM {12}
473  DF  .~> Including mechanism (e.g., auxiliary key-board) for activating keys {3}
477  DF  .~> Including means generating a signal for type selecting or other typing function {2}
480  DF  .~> Including control of key action (e.g., buffer, etc.) {1}
482  DF  .~> For stenographic typewriter
483  DF  .~> For Braille typewriter
484  DF  .~> For foreign-language typewriter
485  DF  .~> Key-board having multiple-character, multiple-movement keys
486  DF  .~> Key-board arranged according to character location {1}
488  DF  .~> Key-board including row of keys having different heights
489  DF  .~> Key-board including keys grouped to facilitate positioning of typist's fingers
490  DF  .~> Key-cap or key-stem structure {5}
496  DF  .~> Key lever or space-bar mounting structure (e.g., dust guard, buffer, pivot, etc.)

DEFINITION

Classification: 400/472

KEY-BOARD OR KEY-LEVER-ACTUATING MECHANISM:

(under the class definition) Subject matter wherein significance is attributed to (a) the key-board* of a typewriter, or (b) one or more of the key* elements of the typewriter, or (c) a key lever, which key lever is a fulcrumed bar that is moved by the pressing of a key element is connected to a mechanism that causes relative movement between a type-face* or a type-die* and a record-medium* to effect record-medium, or which bar is connected to a

mechanism to initiate or cause the operation of a function* of the typewriter, or (d) means for effecting the pressing of one or more key elements.

(1) Note. Mechanism which locks the key-board or key lever against movement will not be found in this or the indented subclasses. Such mechanism is provided for in subclass 414 under appropriate titles.

SEE OR SEARCH THIS CLASS, SUBCLASS:

100+, for a typewriter having a permutative key-board.

414+, for a key element or a key lever on a bottom-strike typewriter.

663+, for lock mechanism, and see (1) Note above.