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Seat Mechanisms

Buying Chairs - what you need to know about comfort and seat mechanisms.

Seat Mechanisms

Chairs are an integral component in the quest to achieve the perfect posture. They should be chosen according to the size and shape of the user's body, the functions which they are to perform and the adjustment mechanisms required for the fulfilment of these functions.

In order to prevent back problems and combat absenteeism, chair manufacturers have come up with a range of "ergonomic" chairs for use in the office environment.

A chair is said to be "ergonomic" when it possesses the adjustment mechanisms required to meet the basic rules of ergonomics and when it can be adjusted in line with the size and shape of the user's body in such a way that he or she can be assured of the highest levels of comfort on an everyday basis.

Respecting the rules of ergonomics will help you to stay fit and healthy:

  1. Remember to keep moving about on your seat.
  2. Lean backwards regularly in order to minimise pressure on your intervertebral discs.
  3. Maintain a good sitting position and use a chair which provides plenty of lumbar support.
  4. Use a chair with adjustment mechanisms which are accessible from the sitting position.

The best chairs are those with adjustment mechanisms which are accessible from the sitting position. Adjustment mechanisms should be logical, intuitive and easy to operate.

Traditional adjustment mechanisms

Traditional adjustment mechanisms

All our swivel task chairs are fitted with a gas lift seat height adjustment mechanism. Backrests are height and/or tilt adjustable for optimum lumbar support.

Seat depth adjustment

Seat depth adjustment

Some chairs have, as standard or as an option, a mechanism which allows the depth of the seat to be adjusted by up to 70mm according to model. Taller users will appreciate this facility.

Permanent contact free-floating backrest mechanism

Permanent contact free-floating backrest mechanism

The backrest remains in permanent contact with the user’s back without the seat changing position. The backrest can be locked in either pre-determined or any position, depending on the model.

Synchro mechanism

Synchro mechanism

This mechanism allows the chair to follow the user’s movements thanks to the co-ordinated tilting action of the seat and backrest. The backrest spring tension can be adjusted to suit the user. The backrest can be locked in either pre-determined or any position, depending on the model.

Central axis recicling tilt mechanism

Central axis recicling tilt mechanism

The chair can be tilted back around a horizontal axis located centrally beneath the seat. Tension control can be personalised according to the weight of the user.

Forward axis reclining tilt mechanism

Forward axis reclining tilt mechanism

The chair can be tilted backwards around a horizontal axis located towards the front of the seat, allowing the user to keep his or her feet in constant contact with the floor.
Tension control can be personalised according to the weight of the user.

Passive Comfort

Backrest and seat contours contribute towards ensuring a better distribution of body weight across the chair. These contours allow the user to adopt a good sitting position and prevent the tendency to slide forwards on the seat, whilst at the same time providing excellent lumbar support.

Armrests play an important role in reducing shoulder and neck strain by supporting the weight of the user's arms. They also help to prevent skeletomuscular problems.

Curved seat fronts help to eliminate pressure points behind the knee and improve blood circulation in the legs.
Most of our chairs are fitted with castors for use on standard floors. Some models, particularly those which carry the GS label, come with self-braking castors. We can also supply optional castors for use on hard floors.