Patent attributes
A panel having particular utility in a chair or other apparatus for receiving an occupant in a seated position includes an envelope of resilient material having at least one small opening for receiving a substantially rigid and U-shaped envelope support frame. The envelope support frame is inserted into the envelope through the opening and positioned inside the envelope to tension the resilient material of the envelope in one or more tension zones. A rear support frame bar is then inserted into the opening and connected to the envelope support frame. The small opening may then be sewn closed, knitted, or heat sealed. The width of each tension zone when the envelope is in its relaxed state is different than the width of each immediately adjacent tension zone.
