US PATENT SUBCLASS 411 / 175
.~.~.~.~ And has projection contacting periphery of aperture

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}
172  DF  .~ Nut having a portion for attachment to substructure {2}
173  DF  .~.~.~ Means to engage extends through aperture {1}
174  DF  .~.~.~ Means to engage grasps an edge of substructure {1}
175.~.~.~.~ And has projection contacting periphery of aperture

DEFINITION

Classification: 411/175

And has projection contacting periphery of aperture:

(under subclass 174) Device wherein the single element includes, on one of the arms of the U, a detent, finger, lip, etc., directed toward the other arm for engaging the periphery of the aperture provided in the substructure for the bolt.

(1) Note. The detent, etc., usually is for the purpose of anchoring the element until such time as the bolt can be threaded into the nut portion of the element.