Chairs and seats – Bottom or back with means to alter contour – Providing support for lower back region
Reexamination Certificate
2004-06-10
2008-12-02
Nelson, Jr., Milton (Department: 3636)
Chairs and seats
Bottom or back with means to alter contour
Providing support for lower back region
Reexamination Certificate
active
07458637
ABSTRACT:
A back construction includes a back shell mounted on a back frame at top and bottom connections, and a flexible lumbar section biased forwardly by a biasing device. The bottom connection is located rearward of the back shell to allow unencumbered sliding entry into the seating unit from a lateral side position, but the bottom connection defines a virtual pivot forward of its physical location to provide the desired path of flexure when the lumbar section is flexed. In one form, the bottom connection is a pair of non-parallel links of dissimilar length. In another form, the bottom connection is a follower with two bearings following a guide slot. In some variations, the force of the biasing device is variable. Seating units incorporating the back construction include a vehicle seat, a foldable portable stadium seat, and a wheelchair seat.
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Heidmann Kurt R.
Norman Christopher J.
Jr. Milton Nelson
Price Heneveld Cooper DeWitt & Litton LLP
Steelcase Inc.
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