US PATENT SUBCLASS 411 / 412
.~.~ Plural threads on single shank

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

378  DF  EXTERNALLY THREADED FASTENER ELEMENT, E.G., BOLT, SCREW, ETC. {16}
411  DF  .~ Thread or shank structure {7}
412.~.~ Plural threads on single shank {1}
413  DF  .~.~.~> Of different pitch

DEFINITION

Classification: 411/412

Plural threads on single shank:

(under subclass 411) Subject matter wherein the helical ridge comprises plural distinct helical ridge means concentrically arranged on the shank of the fastening means with each of the helical ridge means lying between the adjacent convolutions of one or more of other of said helical ridge means.

SEE OR SEARCH THIS CLASS, SUBCLASS:

245, for a threaded bolt and nut and means for coupling them against rotation relative to one another and wherein the means includes a discrete, rotation restricting member which confronts an axially outwardly facing portion of the nut and further wherein the member is in the nature of another nut and additionally wherein means, associated with one or both nuts, is included for restricting the rotation of one of the nuts relative to the other and lastly wherein (a) the thread of one of the nuts is of a different hand than that of the

other and (b) the bolt includes threaded portions mating with the threaded portion of each of the nuts.