초록 ▼

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

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 to flex for improved freedom of movement of the upper back area of the user.

대표청구항 ▼

A chair comprising: a base; a seat supported on said base; a back support pivotally supported on said base; a control operatively connecting said base and said back support, and selectively controlling rearward tilting of said back support; a cushion assembly shaped to support the back of a user the

A chair comprising: a base; a seat supported on said base; a back support pivotally supported on said base; a control operatively connecting said base and said back support, and selectively controlling rearward tilting of said back support; a cushion assembly shaped to support the back of a user thereon; a shell construction connecting said cushion assembly with said back support, said shell construction comprising: a semi-rigid, resiliently flexible sheet, having forward and rearward surfaces forming a back portion shaped to support a back area of an adult user thereon with the cushion assembly being on the forward surface of the shell construction, said sheet having a substantially flat planar shape, a generally continuous thickness and extending substantially continuously in a plane, so that the forward surface of said sheet defines a substantially uninterrupted planar portion; and a plurality of laterally spaced apart first ribs formed integrally with said sheet on the rearward side thereof, and extending generally vertically along at least a portion of said sheet to stiffen the sheet in a vertical plane for firm support of at least the upper area of the back of the seated user, yet dimensioned to permit at least the upper area of said back portion to flex in a horizontal plane for improved freedom of movement to the upper back area of the seated user; and a plurality of second ribs formed integrally on the rearward surface of said sheet, and extending across the central area of said back portion in a generally X-shaped pattern and intersecting at least one of said first ribs to control horizontal flexing of the upper area of said back portion.