US PATENT SUBCLASS 411 / 240
.~.~.~.~.~ Comprising teeth of the ramp and buttress type

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}
240.~.~.~.~.~ Comprising teeth of the ramp and buttress type

DEFINITION

Classification: 411/240

Comprising teeth of the ramp and buttress type:

(under subclass 239) Device wherein the surface configurations formed on each internally threaded element comprise a plurality of projections of the kind which, in profile, display a gradual slope leading to the outermost region of the projection followed by a sharp (e.g., a perpendicular) drop to a base line.