Support systems for the seated human body

Claim 1

A support system for the upright seated human body comprising, a supporting frame including back support means, a flexible web material constrained under tension on said back support means to define a three-dimension back support form, said back support means including pelvic-lumbar support means at the upper pelvic-lumbar area of the human body, said pelvic-lumbar support means supporting said flexible web material with a configuration such that said back support form defines a first support portion which extends laterally of said back support form and is positioned forwardly of the rest of the flexible web material forming the back support form, said first support portion of said back support form being constrained in tension across its width by said pelvic-lumbar support means, said back support means having additional means at second and third locations which are respectively above and below said first support portion which constrains said flexible web material so that the upwardly extending length of said material extends both upwardly and rearwardly and also downwardly and rearwardly from said first portion to define thereby said back support form, said flexible web material being unsupported across the width of the back support form by said back support means between said additional means at said first and third locations.