US PATENT SUBCLASS 400 / 559-- .~.~.~ Via friction plate members engageable by axial displacement (e.g., pressure plate, etc.)

US PATENT SUBCLASS 400 / 559
.~.~.~ Via friction plate members engageable by axial displacement (e.g., pressure plate, 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	DF	.~.~ Including disconnecting ratchet wheel from platen (e.g., declutching ratchet, etc.) {6}
559		.~.~.~ Via friction plate members engageable by axial displacement (e.g., pressure plate, etc.) {1}
559.1	DF	.~.~.~.~> Friction members have cooperating conical surfaces

DEFINITION

Classification: 400/559

Via friction plate members engageable by axial displacement (e.g., pressure plate, etc.):

(under subclass 556) Subject matter wherein the ratchet* wheel and the platen* (i.e., the two components referred to below in this definition) are normally joined or engaged by way of a first member connected to one of the components and a second member connected to the other of the components, both of which components and both of which members are rotatable on a common axis, and wherein said members are positioned one relative to the other so that a substantially radial surface of one member faces a substantially radial surface of the other member and one member is movable relative to the other along the common axis, whereby movement of one member toward the other into nonslidable contact with the other effects joining or engagement of the members and of the components connected thereto for normal incremental rotation of the platen by the ratchet*, and movement of one member away from the other effects unjoining or disengagement of the members.