US PATENT SUBCLASS 411 / 154
.~.~.~ Apertured plate of uniform thickness having undulating contact surfaces

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}
154.~.~.~ Apertured plate of uniform thickness having undulating contact surfaces

DEFINITION

Classification: 411/154

Apertured plate of uniform thickness having undulating contact surfaces:

(under subclass 147) Device wherein the open-center figure is in the nature of a plate penetrated by a hole, and further wherein the plate shows, in a section paralleling its outer periphery and taken before the figure has been subjected to the pressure generated by the tightening of the bolt or nut involved, a series of wavelike formations.

(1) Note. The "prior to being stressed" limitation excludes those figures which have circumferentially spaced projections on each of their axially directed, oppositely facing regions, which projections, if formed alternately on the two regions, may cause the outer periphery to take on an undulating configuration upon the application of an axial force to the figure.