US PATENT SUBCLASS 400 / 547.7
.~.~.~.~.~ Via pawl and ratchet wheel drive

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

545  DF  FOR LINE-SPACING BY INCREMENTAL ROTATION OF PLATEN {15}
546  DF  .~ To facilitate condensed billing (i.e., by determining a desired limit or amount of retrograde or advance platen movement) {2}
547  DF  .~.~ Including stop structure (e.g, traveling stop, etc.) {1}
547.1  DF  .~.~.~ For arresting platen at limit of both retrograde and advance movement {2}
547.3  DF  .~.~.~.~ By lever or push-rod drive for platen {2}
547.7.~.~.~.~.~ Via pawl and ratchet wheel drive {1}
547.8  DF  .~.~.~.~.~.~> With spring motor

DEFINITION

Classification: 400/547.7

Via pawl and ratchet wheel drive:

(under subclass 547.3) Subject matter wherein the movable arm is connected to the platen* by way of a pawl* joined to the movable arm and a ratchet* in the form of a disc joined to the platen.