US PATENT SUBCLASS 297 / 300.4
.~.~.~ Torsion bar or torsion spring


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

285  DF  BACK MOVEMENT RESILIENTLY OPPOSED IN OPERATING POSITION {12}
300.1  DF  .~ Back and seat adjust simultaneously {1}
300.2  DF  .~.~ Back tilts while seat inclination adjusts {4}
300.4.~.~.~ Torsion bar or torsion spring


DEFINITION

Classification: 297/300.4

Torsion bar or torsion spring:

(under subclass 300.2) Simultaneously adjusted back and seat wherein the resilient member is a solid material considerably longer than it is wide, or is a corkscrew-type that twists to resist the tilting of the back.