Patent ID: 8517472

Claim:
A foot-rest chair ring for an adjustable-height chair with a seat operable to raised and lowered between a stool configuration and a desk configuration, the foot-rest chair ring comprising: a rotation hub configured to be rotatably mounted onto a seat post of the adjustable-height chair; a modified ring surrounding the rotation hub; and angularly displaced spokes extending radially from the rotation hub to the modified ring; wherein the modified ring has a perimeter defined by: (a) a convex, ring-shaped section that extends more than 180 degrees around the hub and is configured to support the feet of a person sitting in the chair when the chair is in the stool configuration; and (b) a recessed, concave arc section that completes the perimeter and is configured to avoid obstruction of the legs of a person sitting in the chair when the chair is in the desk configuration; and wherein one of the spokes joins the recessed, concave arc section of the modified ring at a midpoint of the recessed, concave arc section.