| 摘要 |
A swivel arrangement is provided for a chair having a backrest, a chair seat, a chassis, and a base. The chassis includes a swivel seat mounted to an underside of the chair seat, a first connecting seat, a second connecting seat, a spring seat, a control device, and an adjusting rod. The swivel seat includes a hole and a stop adjacent to the hole. The control device includes a pressing plate engaged with an inner end of the adjusting rod and an operative block with a pressing portion. The first connecting seat, the swivel seat, and the second connecting seat are connected by axle rods. The adjusting rod is movable along a longitudinal axis thereof between a first position and a second position, wherein when the adjusting rod is in the first position, the pressing portion of the operative block is aligned with the hole of the swivel seat to allow back-and-forth swivel movements of the swivel seat and the second connecting seat, and wherein when the adjusting rod is in the second position, the pressing portion of the operative block is aligned with and thus stopped by the stop of the swivel seat to thereby prevent back-and-forth swivel movements of the swivel seat and the second connecting seat. When the second connecting seat swivels rearward, the swivel seat swivels rearward by an angular displacement smaller than that of the second connecting seat. |
