| 摘要 |
<p>A back support mechanism (10) for a chair (9). The mechanism (10) has a pad (16) pivotally mounted to two links (17, 18). An operating shaft (24) screw threadedly engages posts (19) mounted relative to guide rails (20). The links (17) co-operate with the posts whereby when the shaft (24) is rotated the posts (19) are caused to move along rails (20). This movement enables the pad (16) to pivot relative to the links (17) to cause the pad (16) to move out of the plane of the backrest (12) of the chair (9).</p> |
