Patent ID: 8602494

Claim:
A pivoting task chair comprising: a chair base; a pivoting mechanism housing supported by the chair base; a pivoting mechanism retained by the pivoting mechanism housing; a seat bottom secured to the pivoting mechanism housing wherein the seat bottom does not pivot in relation to the chair base; a seat back pivotally coupled to the pivoting mechanism housing by the pivoting mechanism to pivot about a pivot axis in relation to the pivoting mechanism housing and relative to the seat bottom whereby the pivoting mechanism provides resilient resistance to a pivoting of the seat back; wherein a distance B from a given point on the seat back to a given point of support for a posterior of a seat occupant progressively decreases as the seat back is pivoted backwardly with a measurement B 1 taken at a first seat back pivoting position being greater than a measurement B 2 at a second, increased seat back pivoting position and the measurement B 2 being greater than a measurement B 1 at a third, further increased seat back pivoting position; and left and right arm supports with upper ends fixed to the seat back, each at a point of support, and lower ends pivotally coupled to the pivoting mechanism, each at a pivot axis coincident with the pivot axis of the seat back to pivot with the seat back wherein a distance A from the point of support of each arm relative to the seat back to the pivot axis progressively decreases as the seat back is pivoted backwardly with a measurement A 1 taken at a first seat back pivoting position being greater than a measurement A 2 at a second, increased seat back pivoting position and the measurement A 2 being greater than a measurement A 3 at a third, further increased seat back pivoting position.