US PATENT SUBCLASS 411 / 239
.~.~.~.~ Including cooperating formations on the axially opposing portions of the nuts

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}
222  DF  .~.~ Internally threaded locking member (e.g., jam nut) {1}
223  DF  .~.~.~ Including means associated with at least one of the nuts for restricting rotation therebetween {11}
239.~.~.~.~ Including cooperating formations on the axially opposing portions of the nuts {2}
240  DF  .~.~.~.~.~> Comprising teeth of the ramp and buttress type
241  DF  .~.~.~.~.~> Comprising surfaces of a curvilinear nature

DEFINITION

Classification: 411/239

Including cooperating formations on the axially opposing portions of the nuts:

(under subclass 223) Device wherein both of the internally threaded elements are formed with, on the portions thereof which occupy an axially confronting relationship, surface configurations which interact with each other to limit or prevent the turning, in at least one direction, of one of the elements with respect to the other.

(1) Note. Infrequently, another distinct member (see subclass 223 above) is located between the internally threaded elements and contributes to the limiting or preventing of turning (e.g., by providing one of the confronting sets of surface configurations).