US PATENT SUBCLASS 400 / 559.1
.~.~.~.~ Friction members have cooperating conical surfaces

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}
559  DF  .~.~.~ Via friction plate members engageable by axial displacement (e.g., pressure plate, etc.) {1}
559.1.~.~.~.~ Friction members have cooperating conical surfaces

DEFINITION

Classification: 400/559.1

Friction members have cooperating conical surfaces:

(under subclass 559) Subject matter wherein the substantially radial surface of each of said members is modified so that the surface of one member is like the exterior surface of a cone and the surface of the other member is like the interior surface of a cone, the facing surfaces of the members corresponding one to the other.