US PATENT SUBCLASS 411 / 216
.~.~ Member or portion includes an axially disposed key

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}
216.~.~ Member or portion includes an axially disposed key {1}
217  DF  .~.~.~> Key coacts with bolt by occupying an axially extending recess formed in the radially outward surface thereof {3}

DEFINITION

Classification: 411/216

Member or portion includes an axially disposed key:

(under subclass 204) Device wherein at least one of the distinct members consists in large part of a portion resembling a dowel, pin, rod, etc., which portion is positioned generally parallel to the longitudinal axis of the threaded elements and usually is received in part in each of them, thus tending to form a positive interlock therebetween.