US PATENT SUBCLASS 411 / 143
.~.~ Formations on either member or surface, and cooperative, restricting means on the other

Current as of: June, 1999
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411 /   HD   EXPANDED, THREADED, DRIVEN, HEADED, TOOL-DEFORMED, OR LOCKED-THREADED FASTENER

81  DF  THREADED FASTENER LOCKED TO A DISCREET STRUCTURE (E.G., PLATE, RAIL, WHEEL) {13}
132  DF  .~ Lock washer-type member located between substructure and bolt head or nut {8}
143.~.~ Formations on either member or surface, and cooperative, restricting means on the other {1}
144  DF  .~.~.~> Formations on surface, means on member, one of which presents a sharp-edged configuration {1}

DEFINITION

Classification: 411/143

Formations on either member or surface, and cooperative, restricting means on the other:

(under subclass 132) Device wherein either the member or the inwardly facing surface of the bolt head or nut includes at least one formation (e.g., a groove, ridge, spur, etc.), and the other is provided with means for coactingly engaging the formation or formations, the engagement serving to prevent or limit rotation of the member and the surface relative to one another.

(1) Note. The engagement may be selective in nature.

(2) Note. A mere corner, edge, etc., of the member or the surface does not constitute a "formation" within the meaning of this subclass; a concavo-convex relationship, however, is considered to be proper for inclusion here.