US PATENT SUBCLASS 16 / 256
.~.~.~ Having helical spring along hinge axis

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

221  DF  HINGE {32}
254  DF  .~ Having means to facilitate assembly and disassembly of hinge sections to join or disjoin hinged members {5}
255  DF  .~.~ Resiliently biased hinge {1}
256.~.~.~ Having helical spring along hinge axis

DEFINITION

Classification: 16/256

Having helical spring along hinge axis:

(under subclass 255) Hinge wherein the elastically deformable element comprises a helix whose convolutions are formed about the hinge axis*.