US PATENT SUBCLASS 411 / 237
.~.~.~.~ Having a part of one of the nuts extending into a circular, axially directed recess of the other, and further including, in the region of the recess, formations cooperating to restrict relative rotation

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}
237.~.~.~.~ Having a part of one of the nuts extending into a circular, axially directed recess of the other, and further including, in the region of the recess, formations cooperating to restrict relative rotation {1}
238  DF  .~.~.~.~.~> At least one of the formations comprises a surface eccentric to the longitudinal axis of the nuts

DEFINITION

Classification: 411/237

Having a part of one or the nuts extending into a circular, axially directed recess of the other, and further including, in the region of the recess, formations cooperating to restrict relative rotation:

(under subclass 223) Device wherein one of the internally threaded elements includes an axially directed portion which enters an axially directed enlargement of part of the axial dimension of the opening provided in the other internally threaded element for receiving the externally threaded element, and wherein the elements include, within the axial dimension common to both, structural features which coact 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 within the axial dimension common to both of the internally threaded elements and contributes to the limiting or preventing of turning.