US PATENT SUBCLASS 400 / 251
CASE-SHIFT MECHANISM

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

251CASE-SHIFT MECHANISM {14}
252  DF  .~> Including programmed-control-system
253  DF  .~> Including electronic control or code-bar control
254  DF  .~> Controlled by typewriter-actuated mechanism
255  DF  .~> Including plural case-shift mechanisms (e.g., for simultaneous or selective use)
256  DF  .~> Actuated by toggle-linkage
257  DF  .~> For case-shift by type-head (e.g., spherical type-head) movement
258  DF  .~> Power-operated mechanism (e.g., for locking shift key) {2}
261  DF  .~> Multiple-shift mechanism (i.e., for type-bar having three or more type faces thereon) {2}
264  DF  .~> For shifting platen {3}
268  DF  .~> For shifting type-face or type-bar {2}
271  DF  .~> By choosing from one of a plurality of type-bars operated by a single key
272  DF  .~> Including key attachment for case-shift {1}
274  DF  .~> For locking case-shift mechanism in position (e.g., rebound lock, cam, etc.) {2}
277  DF  .~> Including limit stop (e.g., block, chain, etc.) {1}

DEFINITION

Classification: 400/251

CASE-SHIFT MECHANISM:

(under the class definition) Subject matter wherein significance is attributed to a means in a typewriter for performing a case-shift* function by effecting relative movement between a record-medium* and a type-face* element that is at the print-point* whereby a typist is enabled to choose which one of two or more forms of character* symbols that may be imprinted by pressing a particular character key* element will be imprinted, the choice being made by the typist who presses or does not press a case-shift key.

(1) Note. As discussed in the definition of case-shift in the Glossary, section III, case-shift is the function* that enables a typewriter to imprint either an upper-case* form or a lower-case* form of character symbol with the same key element, depending on whether the case-shift key is used or not used.

SEE OR SEARCH THIS CLASS, SUBCLASS:

35, for case-shift in a flat-platen* typewriter.