Chair with orthopedic back support

An orthopedic chair comprising:

• a seat;
• a back support having a front support surface projecting upward from the seat to support a seated person's back, and a rear surface;
• an orthopedic support pillow disposed within the back support between said front and rear surfaces thereof;
• and
• means for rotating said pillow about a longitudinal axis thereof extending substantially parallel to the seat so that the pillow causes a portion of the front support surface to bulge outward and create a support portion engagable with a part of the seated person's back, wherein said rotating means includes a rigid shaft extending through the pillow along the axis thereof and having a handle at at least one end of the shaft, said handle being manually grasped to rotate the same and thereby the pillow, wherein such shaft is a flat bar, said rotational axis being eccentric with respect to an exterior surface of said pillow such that rotation of said pillow through predetermined angular intervals causes the shape of the bulge to change, wherein the back support includes frontal and back covers respectively defining said front and rear support surfaces, said covers including a space therebetween extending vertically through the height of the back support and being open at least along one common side of said covers to facilitate manual placement of said pillow at a desired height in said back support between said covers, and further including notches forming anchorage bays located at discrete vertically spaced positions in the back support to anchor said pillow at a desired height.