Back construction with flexible lumbar

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 si...

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Bibliographic Details
Main Authors HEIDMANN KURT R, NORMAN CHRISTOPHER J
Format Patent
LanguageEnglish
Published 03.07.2007
Subjects
BEDS
CHAIRS
CHAIRS FOR DENTISTRY
COFFEE MILLS
DOMESTIC ARTICLES OR APPLIANCES
FUNERAL DEVICES
FURNITURE
HUMAN NECESSITIES
HYGIENE
MEDICAL OR VETERINARY SCIENCE
OPERATING TABLES OR CHAIRS
PERFORMING OPERATIONS
SEATS SPECIALLY ADAPTED FOR VEHICLES
SOFAS
SPICE MILLS
SUCTION CLEANERS IN GENERAL
TRANSPORT OR ACCOMODATION FOR PATIENTS
TRANSPORTING
VEHICLE PASSENGER ACCOMMODATION NOT OTHERWISE PROVIDEDFOR
VEHICLES IN GENERAL
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Summary: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.
Bibliography:Application Number: US20050048673