Patent ID: 6959966

Claim:
A chair comprising: a frame generally symmetrical to a central upright plane; a main link lying generally on the plane and having an inner end pivoted on the frame about an inner axis fixed relative to the frame and an outer end defining an outer axis parallel to the inner axis; an outer arm having an inner end pivoted at the outer axis on the outer end of the main link and having an outer end; a foot rest on the outer-arm outer end; an inner wheel fixed on the frame at the inner axis; an outer wheel fixed on the inner end of the outer arm at the outer axis and pivotal with the outer arm about the outer axis through a plurality of angular positions; connecting means connected to both of the wheels for holding the outer wheel in the same angular position relative to the inner wheel regardless of the angular position of the main link; and drive means for pivoting the main link about the inner axis and thereby pivoting the outer arm about the outer axis.