Chairs and seats – Bottom or back – Contoured back
Reexamination Certificate
2006-05-09
2006-05-09
Nelson, Jr., Milton (Department: 3636)
Chairs and seats
Bottom or back
Contoured back
C297S452310, C297S452180, C297S300200
Reexamination Certificate
active
07040709
ABSTRACT:
A back construction includes an inverted U-shaped back frame and a back shell supported on the back frame and having stiff thoracic and pelvic regions connected by a flexible lumbar region in a manner adapted to ergonomically support a seated user. The lumber section includes a plurality of vertically spaced slots to increase its flexibility. The back shell has a complex curved shape that is forwardly concave in horizontal cross section and forwardly convex in vertical cross section. A force-generating mechanism biases the lumber section forwardly for lumbar support to a seated user.
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Dammermann Arnold B.
DeKraker Larry
Heidmann Kurt R.
Knoblock, legal representative Daryl
Peterson Gordon J.
Jr. Milton Nelson
Price Heneveld Cooper DeWitt & Litton LLP
Steelcase Development Corporation
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