Chair with adjustment feature

Abstract

A chair with an automatic adjustment feature includes a seat coupled by engaging links to a plurality of support arms for relative pivoting and translational movement with respect to such arms. The seat has an upwardly extending rear extension connected to the back rest by an adjusting element. A pivot lever is disposed at either side of the seat, each lever having a first end pivotably pinned to a support arm, a second end attached to the back rest and a hinge pin disposed intermediate such ends and coupling the pivot lever to the seat. The element is of the self-adjusting type for permitting relative linear movement between the rear extension and the back rest while yet preventing bending movement between such extension and such back rest. The positional relationship of the rear extension and the back rest to one another is automatically adjusted as the chair is moved between an upright position and a reclining position.