新孔機構，椅背和坐墊傾仰比例為3:1，符合人體工學，最大傾仰角度23度，4段剎車。側面調整彈簧，具安全回彈功能。線控式的氣壓及傾仰角度鎖定開關。

Synchronized mechanism for large and medium chairs. Backrest and seat tilt at a 3:1 ratio, ergonomic design. The height adjustment function and 4 locking positions. Lateral tension adjustment operated by handle. Return-preventing system for backrest. Cable handles easily attached to the mechanism.