Chairs and seats – Back movement resiliently opposed in operating position – Back adjusts independent of seat
Reexamination Certificate
2007-07-03
2007-07-03
Nelson, Jr., Milton (Department: 3636)
Chairs and seats
Back movement resiliently opposed in operating position
Back adjusts independent of seat
Reexamination Certificate
active
11048673
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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Hubbard, Haas et al., “New Biomechanical Models for Automobile Seat Design,” Article presented at the 1993 Society of Automotive
Heidmann Kurt R.
Norman Christopher J.
Jr. Milton Nelson
Price Heneveld Cooper DeWitt & Litton LLP
Steelcase Development Corporation
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