| 摘要 |
An office chair in which the seat height and back inclination and height are adjustable and having a frictional pivotal coupling between the back and the back supporting member. The adjustment of the back inclination is accomplished with a hub affixed to the back supporting member and a slider disposed for axial motion within said hub and angularly fixed with respect to the chair seat. A pair of projections in the slider ride in helical grooves in the hub so that as the slider is moved axially the back is rotated. A rack attached to the back and slidable in the back supporting member is engaged by a spiral gear member attached to the back supporting member for controlling the height of the back.
|
