US PATENT SUBCLASS 400 / 556
.~.~ Including disconnecting ratchet wheel from platen (e.g., declutching ratchet, etc.)

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.~.~ Including disconnecting ratchet wheel from platen (e.g., declutching ratchet, etc.) {6}
556.1  DF  .~.~.~> Via relatively displaceable pin and slot members
556.2  DF  .~.~.~> Via toothed ring and locking member(s) {2}
557  DF  .~.~.~> Via ball or roller clutching member(s)
558  DF  .~.~.~> Via binding jaws gripping annular flange between jaws
559  DF  .~.~.~> Via friction plate members engageable by axial displacement (e.g., pressure plate, etc.) {1}
560  DF  .~.~.~> Via frictional engagement of periphery of cylindrical member {1}

DEFINITION

Classification: 400/556

Including disconnecting ratchet wheel from platen (e.g., declutching ratchet, etc.):

(under subclass 555) Subject matter wherein said first mechanism for effecting normal increments of platen* rotation includes a ratchet* in the form of a disc or wheel that is joined to or engaged with the platen, and wherein said second mechanism for effecting other than normal increments unjoins or disengages the ratchet from the platen, thereby enabling rotation of the platen relative to its ratchet.