US PATENT SUBCLASS 16 / 280
.~.~ Biased from either direction toward neutral position (e.g., double acting)

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

221  DF  HINGE {32}
277  DF  .~ Resiliently biased hinge {10}
280.~.~ Biased from either direction toward neutral position (e.g., double acting) {4}
281  DF  .~.~.~> Helical spring transverse to hinge axis
282  DF  .~.~.~> Plural hinge axes (e.g., multiple pintle) {1}
284  DF  .~.~.~> Resiliently biased rolling or sliding cam surface
285  DF  .~.~.~> By helical spring along hinge axis

DEFINITION

Classification: 16/280

Biased from either direction toward neutral position (e.g., double acting):

(under subclass 277) Hinge wherein one or more elastically deformable elements are arranged to urge one of the hinged members* to swing about the hinge axis* toward an equilibrium position from either side of said equilibrium position, at which the net force tending to swing the member is zero.

SEE OR SEARCH THIS CLASS, SUBCLASS:

291, for a hinge in which a helical spring transverse to the hinge axis* biases a hinged member* in either direction away from a dead center position.

293+, for a hinge in which a spring other than a coil transverse to the hinge axis* biases a hinged member* in either direction away from a dead center position.