Patent ID: 7478878

Claim:
A self-righting chair having a substantially vertical neutral position, the chair being configured to maintain the substantially vertical neutral position in the absence of a tilting force, the chair comprising: a seat; a base member; and a connector connecting the seat to the base member such that the seat is located above the base member when the chair is in the substantially vertical, neutral position; wherein the base member has a semi-spherical, curved configuration culminating in an apex, wherein the weight of the base member is at least about one hundred percent greater than the combined weight of the connector and the seat, wherein the connector connects a substantially central portion of the seat to a substantially central portion of the base member, such that the seat, connector, and base member are connected along an axis extending through the substantially central portions of the respective seat, connector and base member to provide a weight balanced chair, such that when a force is exerted to move the chair from the substantially vertical neutral position to a tilted position, the chair is moved from the substantially vertical neutral position to the tilted position, then returns to the substantially vertical neutral position when the tilting force is removed, wherein the chair always returns from any amount of tilt to the substantially vertical position and wherein the diameter of the seat is greater than the diameter of the base.