| 摘要 |
The preferred embodiment of the chair iron includes a seat platform pivotally mounted to a frame which in turn is supportable by a chair base. A torsion rod is mounted on the frame with one end fixed and one end free to rotate. A second torsion rod is similarly mounted on the platform, parallel to the first. A pair of levers are slidably mounted on the rods and are maintained in alignment by a bracket assembly. This assembly also includes a cam and pin arrangement whereby a pretension force can be applied to the levers and thereby to the torsion rods. |
