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Class Information
Number: 411/158
Name: Expanded, threaded, driven, headed, tool-deformed, or locked-threaded fastener > Threaded fastener locked to a discreet structure (e.g., plate, rail, wheel) > Member or portion thereof located between substructure and inwardly facing surface of bolt head or nut > Member comprises washer formed as closed loop or apertured plate or as split ring > Split ring having opposed ends offset axially > Contact surface contains a plurality of generally radially extending ridges or grooves removed from the ends
Description: 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.

Patents under this class:

Patent Number Title Of Patent Date Issued
8444357 Providing a counter torque force within a fastening May. 21, 2013
7192232 Self-locking fastening device Mar. 20, 2007
4302136 Helical conical spring lock-washer and method of formation thereof Nov. 24, 1981
4091853 Screw-locking device May. 30, 1978

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