| 摘要 |
A chair includes a base, a seat, a back pivoted to the base and an inner shell construction connecting a cushion assembly to the back. The shell includes a semi-rigid, flexible sheet having a back portion shaped to support a back area of an adult user. The back portion includes a central area and an upper area. A plurality of ribs are formed integrally with the sheet to stiffen the central area of the back portion for lumbar support yet permit the upper portion of the back portion of flex for improved freedom of movement of the upper back area of the user.
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