US PATENT SUBCLASS 400 / 561
.~.~.~.~.~ Expandable band or split ring

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

545  DF  FOR LINE-SPACING BY INCREMENTAL ROTATION OF PLATEN {15}
555  DF  .~ By irregular increments of platen rotation (e.g., for adjustment of platen relative to its actuator, etc.) {6}
556  DF  .~.~ Including disconnecting ratchet wheel from platen (e.g., declutching ratchet, etc.) {6}
560  DF  .~.~.~ Via frictional engagement of periphery of cylindrical member {1}
560.1  DF  .~.~.~.~ Friction member(s) acting on inner periphery of drum {2}
561.~.~.~.~.~ Expandable band or split ring

DEFINITION

Classification: 400/561

Expandable band or split ring:

(under subclass 560.1) Subject matter wherein said second member is a circular or coiled element having a periphery that may be enlarged to conform to or mate with the interior surface of said first member to make nonslidable contact therewith, or may be diminished to unjoin or disengage the members.