US PATENT SUBCLASS 411 / 241
.~.~.~.~.~ Comprising surfaces of a curvilinear nature

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  DF  .~.~.~.~ Including cooperating formations on the axially opposing portions of the nuts {2}
241.~.~.~.~.~ Comprising surfaces of a curvilinear nature

DEFINITION

Classification: 411/241

Comprising surfaces of a curvilinear nature:

(under subclass 239) Device wherein the surface configurations formed on each internally threaded element are rounded or undulating in character.

(1) Note. The interaction of the surface configurations may involve only certain portions thereof at any one rotational position of the elements relative to one another.