US PATENT SUBCLASS 16 / 316
.~.~.~ On axially twisted or helically fluted element

Current as of: June, 1999
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16 /   HD   MISCELLANEOUS HARDWARE

221  DF  HINGE {32}
309  DF  .~ Gravitating hinge having vertical axis {3}
312  DF  .~.~ Including cam surface and follower {4}
316.~.~.~ On axially twisted or helically fluted element

DEFINITION

Classification: 16/316

On axially twisted or helically fluted element:

(under subclass 312) Hinge wherein the vertically sloped or curved surface is formed on an elongated element oriented along the hinge axis*, and having helical convolutions about its longitudinal axis.