Patent ID: 6910741
Filing Date: 2005-06-28
Classification: A47C

Abstract:
1. A back portion for a chair, the back portion comprising: a peripheral frame with an opening therein and at least a top member and two spaced apart sides members; and a resiliently flexible material attached to the frame and drawn taut across the opening, wherein each of the sides members of the peripheral frame is resiliently flexible in a forward and rearward direction at least at an intermediate region corresponding to the lumbar region of an adult occupant of the chair to allow the back portion of the chair above the intermediate region of the peripheral frame to bend rearwardly about the intermediate region of the peripheral frame relative to the back portion of the chair below the intermediate region of the peripheral frame, and the side members are substantially inflexible towards one another to inhibit loss of tautness of the flexible material across the opening during said bending of said back portion of the chair about the lumbar region, and moreover the sides members being of such a construction that the neutral axis of bending of the peripheral frame is closet to a front surface of the peripheral frame than to a rear surface of the peripheral frame to minimise stretching of the resiliently flexible material during said bending of said back portion of the chair about the lumbar region.