US PATENT SUBCLASS 297 / 303.5
.~.~.~ Coaxial adjustment member extends through coil

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

285  DF  BACK MOVEMENT RESILIENTLY OPPOSED IN OPERATING POSITION {12}
303.1  DF  .~ Adjustable resistance {3}
303.4  DF  .~.~ Coil spring {1}
303.5.~.~.~ Coaxial adjustment member extends through coil

DEFINITION

Classification: 297/303.5

Coaxial adjustment member extends through coil:

(under subclass 303.4) Helical coil wherein the apparatus to vary displacement is mounted within the helical spring and abuts against the helical spring to compress or expand the coil.

SEE OR SEARCH CLASS

248, Supports,

577, for similar adjusting means not restricted to a chair or seat.