US PATENT SUBCLASS 297 / 291
.~ Spring centers back on pivot

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

285  DF  BACK MOVEMENT RESILIENTLY OPPOSED IN OPERATING POSITION {12}
291.~ Spring centers back on pivot

DEFINITION

Classification: 297/291

(under subclass 285) Device wherein the back swings or turns about an axis and an elastic device yields to permit a turning in either of two opposing directions in response to occupant pressure and returns the back to its original position upon release of that pressure.

SEE OR SEARCH CLASS

248, Supports,

582, for a support surface pivoted intermediate plural springs.