Patent ID: 8616651

Claim:
An ergonomic chair comprising: a base; a platform for receipt of a user's legs, wherein the platform is coupled with the base and vertically spaced a distance from a lowermost height of the base to allow the user's lower legs to hang vertically off of the platform while the user is in a first seating position, wherein the platform is comprised of a left longitudinal section, a right longitudinal section, and a center longitudinal section disposed between the left and right longitudinal sections, with each section having a rearmost edge and a frontmost edge, and the longitudinal length of each section, measured in a horizontal plane, spanning from the rearmost edge to the frontmost edge of the respective section, wherein the respective frontmost edges of the left and right longitudinal sections extend longitudinally in the horizontal plane beyond the frontmost edge of the center longitudinal section to form left and right forward extensions corresponding to the left and right longitudinal sections, and the frontmost edges of the left, right, and center longitudinal sections collectively form a single continuous forward concave depression, the depression converging to a maximally recessed middle point at the middle of the frontmost edge of the center section, to provide rearward resistance against the user's lower legs when the user is seated in the first seating position and to enable the lower legs to freely move laterally along the depression, wherein the platform has a rearward section and a forward section, and the rearward and forward sections have a width, measured in the horizontal plane, extending from a leftmost edge of the platform to a rightmost edge of the platform, and the forward section includes the collective left and right forward extensions and the forward concave depression of the platform, wherein the width of the forward section is greater than the width of the rearward section so as to allow the user to place the user's legs in a cross-legged position on the left and right forward extensions at the left and right longitudinal sections of the platform when the user is in a second seating position, and the depression is sufficiently rearwardly deep to allow the user to hang one lower leg off of the platform and place his other leg in a cross-legged position on one of the forward extensions with each knee being equally forwardly spaced; and a seat vertically spaced above the platform for receipt of the user's buttocks, such that the left and right forward extensions of the platform are configured to receive the user's legs in a cross-legged position while the user's buttocks rest on the seat in the second seating position.