Back construction for seating unit

Details Back construction for seating unit Back construction for seating unit

2004-12-03

2010-06-22

Barfield, Anthony D (Department: 3636)

Chairs and seats

Bottom or back with means to alter contour

Providing support for lower back region

C297S284700, C297S440200

Reexamination Certificate

active

07740315

ABSTRACT:
A chair includes a base having a control assembly operably supporting a seat assembly and also a back assembly for movement about a seat tilt axis and a back tilt axis, respectively. The back assembly includes a flexible sheet supported at upper/outer corners by a back support structure and hanging downwardly. The flexible sheet includes a lower portion coupled to the back support structure by a tensioner for holding the lower portion rearwardly. A vertically-adjustable lumbar mechanism is adjustably supported on the back support structure and operably engages the flexible sheet for flexing a lumbar area of the flexible sheet forwardly to provide an optimal ergonomic horizontal and vertical convex shape for postural lumbar support.

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