Ergonomic Information
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Ergonomic Information

Ergonomics

Various ergonomic features and mechanisms are available on our wide range of office chairs.
It is important to know how these various mechanisms can change the comfort and ergonomics of the chair range you want to select as it will affect the way you are able to use and adjust the chair, as well as provide you with the sufficient back and body support you may require from your office chair.

We have listed all our mechanisms with each product in order for you, our customer, to understand the adjustments on each chair as well as evaluate which mechanism will suit your requirements perfectly.

TENSION ADJUSTMENT

This enables you to adjust the tension on the chair. This is the knob found underneath the chair, towards the front of the seat. When the seat is unlocked, you can tilt the chair while seated. You can change the tension to be loose (so that the chair tilts easily) or tight (so that you must use more strength to tilt the chair). Lighter/smaller people should have a loose tension and heavier people should have a tighter tension. While seated on the chair, turn the knob clockwise to loosen or anticlockwise to tighten.

GAS HEIGHT ADJUSTMENT

This allows you to adjust your seat up or down. The lever is situated underneath the seat on the right-hand side. To lower the seat, sit on the chair and pull the lever upwards towards the seat. To heighten the seat, lift your body off the chair and pull the lever upwards and adjust to desired height. For good posture, your feet should be placed flat on the ground with your thighs and calves at a 90-degree angle.

DRAUGHTSMAN CONVERSION

This is a gas spindle that is higher than normal gas spindles. These are fitted to chairs that need a seat height higher than normal. I.E. a draughtsman’s table / laboratory table or higher counter worktops. It works the same as a conventional gas. These can only be fitted to operator’s chairs and some mid back chairs.

SWIVEL ONLY MECHANISM

The swivel mechanism is usually standard on basic typist chairs or any chair with a fixed backrest as part of the design. This mechanism allows the chair seat to be able to swivel from side to side but does not allow any backrest or seat tilt movement. Gas height adjustment is included and allows the chair to be adjusted in height.

SWIVEL & TILT MECHANISM

The swivel & tilt mechanism is usually standard on single shell chairs where the backrest of the chair and seat is made out of a single plywood shell or economy chairs. This mechanism allows for the chair seat and backrest to tilt backwards together but is not able to lock in any of the tilted positions.

 

The chair is only lockable in an upright position by using pushing the single gas lever, which is standard on all chairs for height adjustment, inwards to the seat and therefore preventing the chair from tilting backwards. To unlock this position the gas lever can be pulled away from the seat in order for the chair to be able to tilt backwards again.

RAKING BACK/PERMANENT CONTACT MECHANISM

The raking back mechanism or permanent contact mechanism as it is known in some designs, is usually standard on operators chairs or chairs with a split shell design where the seat and backrest are not connected to each other. This allows for more ergonomic movement of the backrest however the seat of the chair is still fixed and does not tilt together with the backrest.

 

To adjust the backrest, a separate lever to the gas height adjustment lever is normally used (in some designs the mechanism uses the same lever). Pulling the lever upwards allows for the backrest to be tilted freely to the desired position and then pushing down on the same lever allows for the backrest to be locked into position.

This mechanism also allows for the backrest to be adjusted in height unless otherwise specified.

FORWARD KNEE TILT MECHANISM

The forward knee tilt mechanism is usually standard on single shell chairs where the seat and backrest of the chair is connected or split shell chairs where the backrest and seat is connected by design.

This allows for the chair seat and backrest to tilt together but be able to lock in various tilted positions unlike the standard ‘swivel & tilt’ mechanism, which is only lockable in an upright position. To adjust the chair, a separate lever to the gas height lever is supplied which can be pulled up wards allowing the chair to tilt backwards to the desired position. Pushing the lever downwards locks the chair in that position.

 

An added feature to this mechanism is the fact that unlocking the tilted position does not immediately ‘release’ the tilt position as to not throw the person sitting on the chair forward. To release the tilt position, the person sitting in the chair is required to first lean backwards into the backrest ‘unlocking’ the position and only then will the backrest be able to move forward again into a new position.

SYNCHRO MECHANISM

This mechanism is usually either standard or optional on any split shell chair where the backrest and seat are not connected by design.

The preferred mechanism in ergonomic seating, this adjustment allows for the seat and backrest to be tilted individually and relative to each other. This means that for every 1 degree the seat tilts, the backrest tilts 2 degrees, making this mechanism highly beneficial to both personal comfort as well as overall well-being during extended hours of sitting.

 

The Synchro mechanism also allows the seat and backrest to lock in various tilted positions by pulling the synchro lever up to adjust the seat and back to the desired position and push it back down in order to lock the chair in that position.

An added feature to this mechanism is the fact that unlocking the tilted position does not immediately ‘release’ the tilt position as to not throw the person sitting on the chair forward. To release the tilt position, the person sitting in the chair is required to first lean backwards into the backrest ‘unlocking’ the position and only then will the backrest be able to move forward again into a new position.

ECONO SYNCHRO MECHANISM

The econo synchro mechanism is usually standard on any split shell chair where the backrest and seat are not connected by design.

This adjustment allows for the seat and backrest to be tilted individually and relative to each other. This means that for every 1 degree the seat tilts, the backrest tilts 2 degrees, making this mechanism highly beneficial to both personal comfort as well as overall well-being during extended hours of sitting.

 

Unlike the standard full synchro mechanism, the econo synchro can only lock in the upright position using a single lever that also adjust the height adjustment of the chair. It can not lock in the various tilted positions as with the full synchro version but does have the benefit of the free float seat and backrest tilt action.

To lock the chair in the upright position the lever on the right-hand side must be pushed towards the chair, locking it into position. Unlocking the chair will require the lever to be pulled away from the seat which in turn allow the backrest and seat to tilt freely again.

MIDDLE PIVOT SYNCHRO MECHANISM

The middle pivot synchro mechanism is usually standard on any split shell chair where the backrest and seat are not connected by design.

This adjustment allows for the seat and backrest to be tilted individually and relative to each other. This means that for every 1 degree the seat tilts, the backrest tilts 2 degrees, making this mechanism highly beneficial to both personal comfort as well as overall wellbeing during extended hours of sitting.

 

Unlike the standard synchro mechanism, the middle pivot mechanism uses the same lever to adjust the synchro action as it does for adjusting the chair’s height. Moving the lever forwards and backwards allows for the chair to be tilted into the desired position and locked. Pushing the lever downwards and upwards adjusts the gas height adjustment.

An added feature to this mechanism is the fact that unlocking the tilted position does not immediately ‘release’ the tilt position as to not throw the person sitting on the chair forward. To release the tilt position, the person sitting in the chair is required to first lean backwards into the backrest ‘unlocking’ the position and only then will the backrest be able to move forward again into a new position.

SEAT SLIDER

Incorporated in some executive and heavy-duty chair ranges, a seat slider can be included in the synchro mechanism in order to allow the chair seat to move backwards and forwards, accommodating both short and tall legged users.

HEATHROW MECHANISM

The Heathrow 24/7 chair features a unique free float heavy duty mechanism designed and developed in Canada specifically for the North American 24/7 market.

Over and above it’s extremely robust construction, the mechanism also allows for the backrest position to be adjusted independently of the seat tilt movement as well as integrating a seat slider to adjust the depth of the seat. The mechanism also includes a side tension adjustment that allows the tension to be easily adjusted while sitting on the chair.

The gas height adjustment on the Heathrow 24/7 has a class 4 (heavy-duty) certification which is imported directly by the manufacturer specifically for this range.

FORM MECHANISM

During extended periods of sitting, Dynamic sitting is globally acknowledged to be highly beneficial to both personal comfort and wellbeing.

The Form 2.0 mechanism fully embraces Dynamic sitting by allowing the seat to pivot forwards or backwards with the option to lock the seat at any desired angle. Alternatively, if you prefer not to lock the seat angle, a spring tension adjustment is available to allow individual seat tension adjustment.

 

 

By altering the seat angle on the Form 2.0, the pressure under the thighs usually caused by by the front edge of the seat, may be reduced. Furthermore, by ensuring that the pelvic angle is slightly “open”, i.e. sitting so that the knees are marginally below the level of the hips, the pressure in the lower lumbar region of the back is significantly reduced.

The backrest of the Form 2.0 is not only height adjustable but also has a “permanent contact” feature that allows the backrest to be in permanent contact with the user’s back, or it may be locked in any position within it’s travel range.

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