US PATENT SUBCLASS 411 / 137
.~.~.~ Two looplike elements interlocked by laterally introduced key


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}
136  DF  .~.~ Member comprises looplike element (e.g., washer) interlocked with additional element, one of them engaging substructure or surface in other than planar, face-to-face contact {3}
137.~.~.~ Two looplike elements interlocked by laterally introduced key


DEFINITION

Classification: 411/137

Two looplike elements interlocked by laterally introduced key:

(under subclass 136) Device wherein the member is made up of two elements which form a closed, or a more closed than open, circle or polygon, and another element which is inserted between the two elements by movement toward, and more or less at right angles to, the axis of the bolt, the insertion of the other element serving to key the two elements against rotation relative to one another.

(1) Note. The usual practice in the art of this subclass is to place the two elements on a bolt and then turn a nut tightly into place on the bolt. The key is then inserted at the juncture of the two elements. Having eliminated any possibility of rotation of one of the two elements relative to the other, it is not expected that the nut will tend to turn in an unthreading direction. To further insure the absence of any such tendency, the substructure-confronting element of the member often includes structure to restrict it in rotation relative to the substructure, and the element confronting the inwardly facing surface of the nut sometimes is provided with teeth or equivalent formations for enhancing its engagement with the nut.

SEE OR SEARCH THIS CLASS, SUBCLASS:

135, for another device of this area (132+) which occasionally utilizes two, more or less annular, elements; in that subclass, however, one of those elements constitutes the member, whereas the other element serves to retain the one element (i.e., the member) in place.