| 摘要 |
<p>A chair includes a base having a control, and a seat and a back tilt bracket pivoted to the control for synchronous movement. An angularly-adjustable extension is adjustably supported on the back tilt bracket and is pivotally connected to a back support structure and a backrest frame in a four-bar linkage arrangement. The back support structure includes a spine assembly and armrests are operably supported on the spine assembly for vertical adjustment by an armrest mount. The armrests pivot at an angular rate between a rate of the seat and the back during recline of the back. A lumbar slide slidably engages a back shell for changing a vertical shape of the lumbar section, and lumbar side arms engage a rear surface of the back shell for changing a horizontal shape of the lumbar section.</p> |
