US PATENT SUBCLASS 411 / 152
.~.~.~ Ends of split ring overlap in stressed condition

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}
152.~.~.~ Ends of split ring overlap in stressed condition {1}
153  DF  .~.~.~.~> Overlap of at least 180 degrees (e.g., coil)

DEFINITION

Classification: 411/152

Ends of split ring overlap in stressed condition:

(under subclass 147) Device wherein the open-center figure does not form a closed path, but, instead, has two, distinct ends, and further wherein those ends pass beyond one another to the extent that, when the figure is subjected to an axially directed load as the result of the tightening of the bolt or nut, they will be superposed relative to one another in a direction paralleling the principal axis of the figure.

(1) Note. The "stressed condition" limitation is intended to rule out those open-center figures wherein, in a relaxed state, the ends appear to overlap, but which ends, upon the compressing of the figure by the tightening of the bolt or nut, move apart to the extent that there is no longer any overlap.

(2) Note. An overlap in a radial sense, that is, where the ends pass beyond one another but one lies farther from the principal axis of the figure than the other, is not the type of overlap contemplated by this subclass.

(3) Note. (1) Note of subclass 151 above is applicable here, also.