US PATENT SUBCLASS 411 / 254
.~.~.~ Gripping member is moved radially into engagement with the threads

Current as of: June, 1999
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411 /   HD   EXPANDED, THREADED, DRIVEN, HEADED, TOOL-DEFORMED, OR LOCKED-THREADED FASTENER

190  DF  HAVING STRUCTURE TO RESTRICT ROTATION OF THREADED, MATING PIECES (E.G., NUT LOCK) {13}
204  DF  .~ Structure is coaxial, distinct member (e.g., washer, key, or nut portion) that restricts nut piece {7}
246  DF  .~.~ By thread-gripping locking element {5}
254.~.~.~ Gripping member is moved radially into engagement with the threads {1}
255  DF  .~.~.~.~> Including discrete means to move or to lock the gripping member relative to the externally threaded element

DEFINITION

Classification: 411/254

Gripping member is moved radially into engagement with the threads:

(under subclass 246) Device wherein the locking member assumes the thread gripping position upon being moved toward or from, and generally perpendicular to, the axis of the threaded elements.

(1) Note. The member is sometimes moved into its gripping position by applying a radially inwardly directed force for constricting its periphery.