US PATENT SUBCLASS 297 / 333
.~.~.~.~ Spring axis coaxial with pivot axis of bottom


Current as of: June, 1999
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297 /   HD   CHAIRS AND SEATS

311  DF  MOVABLE BOTTOM {5}
313  DF  .~ Tiltable {5}
331  DF  .~.~ Movable to inoperative position {3}
332  DF  .~.~.~ Biased to position {1}
333.~.~.~.~ Spring axis coaxial with pivot axis of bottom


DEFINITION

Classification: 297/333

(under subclass 332) Device wherein the biasing means includes a resilient means which has an axis coincident with the turning axis of the bottom.

SEE OR SEARCH THIS CLASS, SUBCLASS:

292, for a resilient back biased by a coil spring which surrounds a horizontal pivot.

293, for a resilient back biased by a coil spring, which comprises a horizontal pivot.

SEE OR SEARCH CLASS

16, Miscellaneous Hardware,

72+, for spring-actuated door closers; and subclasses 277+ for spring hinges, per se. 248, Supports,

597, for a spiral biasing spring coaxial with a horizontal pivot.