US PATENT SUBCLASS 411 / 204
.~ Structure is coaxial, distinct member (e.g., washer, key, or nut portion) that restricts nut piece

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.~ Structure is coaxial, distinct member (e.g., washer, key, or nut portion) that restricts nut piece {7}
205  DF  .~.~> Member includes pawl- or pivoting key-type portion engaging threads {1}
209  DF  .~.~> Member includes key, screw, tongue, etc. perpendicular to threads {2}
214  DF  .~.~> Member includes screw receivable in an axially extending, internally threaded bore {1}
216  DF  .~.~> Member or portion includes an axially disposed key {1}
221  DF  .~.~> Member or portion includes piece that interlocks with an axially extending recess or slot in a bolt and a recess in an axially outwardly facing side of a nut
222  DF  .~.~> Internally threaded locking member (e.g., jam nut) {1}
246  DF  .~.~> By thread-gripping locking element {5}

DEFINITION

Classification: 411/204

Structure is coaxial, distinct member (e.g., washer, key, or nut portion) that restricts nut piece:

(under subclass 190) Device provided with one or more distinct members having a capability of restricting the rotation of at least the internally threaded element, which member (or members) (a) is positioned outwardly, at least in part, of the internally threaded element (relative to the head end of the externally threaded element) and (b) cooperates with that outwardly facing portion of the internally threaded element to restrict the rotation thereof.

(1) Note. The cooperation of the distinct member with the internally threaded element may involve anything from the engagement of a flat surface on one with a similar surface on the other to the interlocking of rather elaborate formations or both. Infrequently, the engagement may be that of an axially directed extension on either the element or the member within an axially facing recess (e.g., an annular one) in the member or element, respectively.