US PATENT SUBCLASS 411 / 155
.~.~.~ Apertured plate having arched sectional configuration (e.g., concavo convex)

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}
155.~.~.~ Apertured plate having arched sectional configuration (e.g., concavo convex) {1}
156  DF  .~.~.~.~> Arched configuration circumscribes aperture

DEFINITION

Classification: 411/155

Apertured plate having arched sectional configuration (e.g., concavo-convex):

(under subclass 147) Device wherein the open-center figure is in the nature of a plate penetrated by a hole, the center of the hole ordinarily representing a point on the principal

axis of the figure, and further wherein the plate is curved in cross section in at least one direction or is otherwise so configured in section as to place its central portion in a different plane than some or all of its periphery, in order that it may bend to resist a force applied more or less axially.