Back shell with selective stiffening

Details Back shell with selective stiffening Back shell with selective stiffening

1991-11-25

1994-08-02

Aschenbrenner, Peter A.

Chairs and seats

Bottom or back

Directly connected bottom and back

29745238, 297DIG2, A47C 1024

Patent

active

053339347

ABSTRACT:
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.

REFERENCES:
patent: 3669499 (1972-06-01), Semplonius et al.
patent: 3695707 (1972-10-01), Barecki et al.
patent: 4000925 (1977-01-01), Doerr et al.
patent: 4065182 (1977-12-01), Braniff et al.
patent: 4133579 (1979-01-01), Springfield
patent: 4632458 (1986-12-01), Brown et al.
patent: 4717202 (1988-01-01), Batchelder, III et al.
patent: 4744603 (1988-05-01), Knoblock
patent: 4776633 (1988-10-01), Knoblock et al.
patent: 5050931 (1991-09-01), Knoblock

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