US PATENT SUBCLASS 411 / 93
.~.~.~ Having plural parts, one of which engages the inwardly facing surface of a bolt head or nut

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}
90  DF  .~ Member extending between and engaging flat formed on side of each of a plurality of bolts or nuts (e.g., side lock) {5}
92  DF  .~.~ Having plural openings or notches engaging a bolt or nut on two sides {3}
93.~.~.~ Having plural parts, one of which engages the inwardly facing surface of a bolt head or nut {2}
94  DF  .~.~.~.~> Special fishplate engaging inwardly facing surface
95  DF  .~.~.~.~> Elastically or plastically deformable part

DEFINITION

Classification: 411/93

Having plural parts, one of which engages the inwardly facing surface of a bolt head or nut:

(under subclass 92) Device wherein the member consists of at least two coacting pieces, one or more of which has at least one area which is contacted by the inwardly facing (i.e., the working) surface of at least one of the bolt heads or nuts.

(1) Note. In the instance of a bolt which is provided with both a primary and a secondary nut (i.e., a double nut), and the contact of the area of one of the pieces is made by the inwardly facing surface of the secondary, or outer nut, rather than by the inwardly facing surface of the primary, or inner nut, classification is not in this area (93+) but is in subclass 96 below, instead.

(2) Note. In the case of an "undercut" nut, the inwardly facing surface frequently is the inwardly facing surface of the larger diameter portion, rather than the corresponding surface of the smaller diameter portion.