Lumbar support

摘要

A back portion for a chair 10 has a peripheral frame defining an opening therein. A lumbar support portion 36 is disposed in the opening. The lumbar support portion 36 includes a rigid panel 207. Two hinge devices 214 are hingedly mounted on opposite sides of the peripheral frame 34. The lumbar support portion 207 is mounted on the peripheral frame by the two hinge devices 214. Each hinge device 214 has a biasing device (not shown) associated with it to bias the hinge devices 214 forwardly relative to the peripheral frame. Various optional features are disclosed.