US PATENT SUBCLASS 400 / 328
.~.~ By force-feed or screw mechanism (e.g., direct drive, screw-biasing carriage, etc.)

Current as of: June, 1999
Click HD for Main Headings
Click for All Classes

Internet Version by PATENTEC © 1999      Terms of Use


400 /   HD   TYPEWRITING MACHINES

283  DF  CARRIAGE OR CARRIAGE-MOVING OR MOVEMENT-REGULATING MECHANISM {11}
319  DF  .~ Carriage-feed mechanism (e.g., escapement, etc.) {14}
328.~.~ By force-feed or screw mechanism (e.g., direct drive, screw-biasing carriage, etc.) {1}
328.1  DF  .~.~.~> Including pawl and toothed rack

DEFINITION

Classification: 400/328

By force-feed or screw mechanism (e.g., direct drive, screw-biasing carriage, etc.):

(under subclass 319) Subject matter wherein the carriage* is caused to be moved in a carriage-feed (i.e., character-space*) direction by a mechanism that positively engages the carriage or a portion affixed thereto and that positively moves in said direction to thereby move the carriage therewith, or wherein the carriage is caused to be moved in said direction by a helically threaded element that is rotated and cooperates with another complementary element on the carriage to move the carriage.

(1) Note. In this subclass the carriage may be moved by a spring that is biased or tensioned by a screw, or the carriage may be moved by a pawl* engaging and moving a ratchet* wheel.

SEE OR SEARCH THIS CLASS, SUBCLASS:

305, for force feed in a variable-feed carriage mechanism.