Patent Number: 7,712,834

Title: Back support for seating unit

Abstract: A back support includes a base, a seat, and a back frame pivoted to the base. The seating unit has a flexible back (i.e., back shell) supported on the back frame and having stiff upper and lower sections connected by a forwardly protruding flexible lumbar section for providing lumbar support to a seated user. A spring mechanism is connected to the back frame and to a center lower edge of the flexible back. The spring mechanism biases the flexible back to bias the lumbar toward a forwardly protruding shape to provide optimal lumbar support when in the upright position and also during recline of the seated user.

Inventors: Knoblock; Glenn A. (Fort Collins, CO), Knoblock, legal representative; Daryl (Fort Collins, CO), Dammermann; Arnold B. (Winona, MN), DeKraker; Larry (Holland, MI), Heidmann; Kurt R. (Grand Rapids, MI), Peterson; Gordon J. (Rockford, MI), Roossien; Charles P. (Wyoming, MI), Teppo; David S. (East Grand Rapids, MI)

Assignee: Steelcase Inc.

International Classification: A47C 3/00 (20060101)

Expiration Date: 5/11/12018