US PATENT SUBCLASS 411 / 261
.~.~.~ In the nature of a dished washer

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}
259  DF  .~ Comprising a thread lock {18}
260  DF  .~.~ Including a distortable metallic washer or sleeve {1}
261.~.~.~ In the nature of a dished washer

DEFINITION

Classification: 411/261

In the nature of a dished washer:

(under subclass 260) Device wherein the member is a washer which is concave on one of its axially directed faces and is adapted (e.g., by having a convex, opposite face) to be axially collapsed by the application of a compressive force, thus causing its inner and outer peripheries to shift radially, at least one of them moving into engagement with the threads on one of the threaded elements.