Synchro Mechanism

Synchro Chair Mechanisms and Dynamic Sitting

Office chairs fitted with a Synchro mechanism, or “synchronous” chairs, are a more recent development in chair ergonomics. Synchro mechanism chairs have a mechanical tilt that moves both the backrest and seat together in a fixed ratio. All synchro mechanisms ensure that the movement of the backrest is greater than the movement of the seat. Typically synchro mechanisms have a 2:1 ratio that allows the backrest to move 2 degrees for every 1 degree of movement in the seat.

Synchro mechanism with a 2:1 backrest-seat ratio

Synchro mechanisms improve Ergonomic Comfort through:

  • Dynamic Sitting. By allowing the backrest and seat to move together and relative to each other, the muscles in the lumbar region of the back are automatically stimulated. This increases the blood flow through these muscles which alleviates lower back pain commonly associated with long periods of static sitting. Dynamic Sitting has long been acknowledged as the global benchmark for ergonomic comfort.
  • Dynamic back support. In the free-float position, the chair is dynamic and the backrest provides continual back support by moving with you, i.e. the backrest moves forward with you when you are working at a desk, but moves backwards with you when you recline to talk on the phone.
  • Tension Adjustment. A tension adjuster allows you to adjust the amount of tension required to suit your body weight.
    A weight-sensitive synchro mechanism automatically adjusts to your body weight.
  • Locked or Free-Float. Our synchro mechanisms will allow the backrest to be locked in up to 5 positions, or to free-float.

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