US PATENT SUBCLASS 16 / 285
.~.~.~ By helical spring along hinge axis

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

221  DF  HINGE {32}
277  DF  .~ Resiliently biased hinge {10}
280  DF  .~.~ Biased from either direction toward neutral position (e.g., double acting) {4}
285.~.~.~ By helical spring along hinge axis

DEFINITION

Classification: 16/285

By helical spring along hinge axis:

(under subclass 280) Hinge wherein the elastically deformable element is in the form of a helix arranged about and coaxial with the hinge axis*.