US PATENT SUBCLASS 400 / 663
LOCKING OR INTERLOCKING MECHANISM

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

663LOCKING OR INTERLOCKING MECHANISM {7}
664  DF  .~> For interlocking plural functions or mechanisms {2}
667  DF  .~> Key-board lock using interlock mechanism
668  DF  .~> Locking means actuated in response to a condition {4}
674  DF  .~> For locking carriage in centered position (e.g., with shipping support) {1}
676  DF  .~> Key-board security lock (e.g., cover plate, etc.)
677  DF  .~> For locking selected group(s) of keys
678  DF  .~> For locking key in actuated position (e.g., to remove type-face from ink pad)

DEFINITION

Classification: 400/663

LOCKING OR INTERLOCKING MECHANISM:

(under the class definition) Subject matter wherein significance is attributed to means for preventing an operation from occurring or to means for preventing a normally movable member from moving, or wherein significance is attributed to means for preventing two mutually exclusive operations from occurring simultaneously or to means for preventing two mutually exclusive movable members from moving simultaneously.

(1) Note. The difference between "lock" and "interlock" will best be illustrated by the following examples. In typing a line of text, the typewriter carriage* reaches a position, determined by a margin-stop*, corresponding to the end of a print-line*. At this position of the carriage, it is desirable to prevent further movement of the carriage, or movement of any of the key* elements, or of the space-bar*. A lock means prevents such movement, but does not prevent a desired carriage return movement. Moreover, a typist may override a carriage lock by pressing a margin*-release key. A lock may also be used to prevent movement of typewriter keys, carriage, or other parts during transport of the typewriter. An interlock is used to prevent movement of one key while another key is pressed, or to prevent movement of a key while the carriage is moving to a tabular position. Stated in different terms, if it is not desirable for two operations or movements to occur at the same time, an interlock is used to prevent one while the other is occurring.

SEE OR SEARCH THIS CLASS, SUBCLASS:

247+, for a case-shift* locking means.

286.3, for a denominational lock in a tabular carriage.

294.2, for a key lock in a tabular carriage.

589, for locking mechanism in a typewriter including tally-strip feeding.