US PATENT SUBCLASS 411 / 221
.~.~ Member or portion includes piece that interlocks with an axially extending recess or slot in a bolt and a recess in an axially outwardly facing side of a nut

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}
221.~.~ Member or portion includes piece that interlocks with an axially extending recess or slot in a bolt and a recess in an axially outwardly facing side of a nut

DEFINITION

Classification: 411/221

Member or portion includes piece that interlocks with an axially extending recess or slot in a bolt and a recess in an axially outwardly facing side of a nut:

(under subclass 204) Device wherein the member includes a formation in the nature of a radially inwardly directed projection for entering a groove or related opening formed in the externally threaded element and extending parallel to the longitudinal axis thereof, and also includes another formation whereby it engages against rotation a depressed region in the axially outwardly facing portion of the internally threaded element.

(1) Note. The first mentioned formation usually has only a minimal axial dimension.

(2) Note. The second mentioned formation often comprises the configuration of the outer periphery of the member.