US PATENT SUBCLASS 411 / 158
.~.~.~.~ Contact surface contains a plurality of generally radially extending ridges or grooves removed from the ends

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}
157  DF  .~.~.~ Split ring having opposed ends offset axially {2}
158.~.~.~.~ Contact surface contains a plurality of generally radially extending ridges or grooves removed from the ends

DEFINITION

Classification: 411/158

Contact surface contains a plurality of generally radially extending ridges or grooves removed from the ends:

(under subclass 157) Device wherein the open-center figure is formed with two or more projections or recesses facing the bolt or nut or facing the substructure, or with at least one projection or recess facing the bolt or nut and at least one other projection or recess facing the substructure, and further wherein the projections or recesses have a length dimension whereby they traverse, in a direction generally paralleling that of a radian of the figure, that surface of the figure which faces the bolt or nut or that surface thereof which faces the substructure or both such surfaces, and additionally wherein the plurality of projections or recesses is in addition to any such projections or recesses as may be present at a location proximate to either of the free ends of the figure.

(1) Note. The limitation which excludes projections or recesses at or immediately adjacent the free ends is necessitated by such extremely common practices as, for example, imparting a chisel-like shape to an end, bending an end slightly in an axial direction and thus forming a ridge at the axis of the bend, and so forth.

SEE OR SEARCH THIS CLASS, SUBCLASS:

157, for an open-center figure proper for this area (157+) having projections in the nature of spirally wound ribs, as explained in (5) Note of that subclass.