US PATENT SUBCLASS 411 / 148
.~.~.~ Engaging side wall of counterbore in substructure

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}
147  DF  .~.~ Member comprises washer formed as closed loop or apertured plate or as split ring {8}
148.~.~.~ Engaging side wall of counterbore in substructure

DEFINITION

Classification: 411/148

Engaging side wall of counterbore in substructure:

(under subclass 147) Device wherein the substructure is provided with either a cylindrical or a conical enlargement of a portion of the bolt shank passage, which enlargement receives either a bolt head or a nut, and wherein the open-center figure, or one of a plurality thereof, makes contact with some portion of the inner surface of the enlargement.

(1) Note. Frequently, the open-center figure is configured to embrace a bolt head which is formed with an upwardly and outwardly flared (e.g., a beveled), substructure-confronting surface.