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You can find many terms by the ergonomists and chair companies without any explanation about good adjustments of features. You can be able to link different chair features with many good things for your body. You should think again if you have understood why these chairs have such designs and you should check your assumptions as well with which you might find some new points. There are no specific dimensions supplied by this section for different adjustments.
You can be able to find recommended ranges in documents like ANSI BSR/HFES 100 standard for VDT Workstations from HFES and Ergonomic Guidelines for office furniture from BIFMA.
You should not concentrate on the quality or quantity features. You can be able to adjust a chair to given posture or body size with the help of these described features. You should be well aware of the importance of posture change. There should be free posture change in adjustability features. You can find more topics on back pain basics page and you can also find information about ergonomics about seating from Humanics Ergonomics.
Seat Height Adjustability
The users can be able to adjust their seats with their feet on floor or work surface with this feature. They can also place their keyboards at an appropriate height. The users can work easier with pneumatic adjustability as compared to mechanical adjustability.
Seat Depth Adjustability
It can be achieved with sliding seat pan or backrest in-out adjustability in which front to back depth of seat is changed. The small people can use shorter seat pan to use chair backrest and taller individuals can use deeper one.
Backrest Angle Adjustability
The angle of backrest of the seat can be changed with this feature. It can be done by using springs or fixing materials in the chair. You can have support at different degrees of recline with this feature in which body weight is transferred to the chair backrest and load on the back is lightened. The angle between torso and thighs can also be increased with backrest angle adjustability due to which lower back is curved inward. There can be less pressure on discs with this inward curve called lordosis.
Chairs recline or tilt
The angle of the seat to the floor is changed with this feature. The upper body weight is shifted to backrest of chair with reclined chair which have two main categories. The knees are lifted in first category called column tilt with the help of chair pivots and back descends. Knee tilt is other one in which pivot is forward near the kneed. There is negligible knee lift in knee tilt chair.
Seat pan angle adjustability
The change of forward back angle of seat is referred to seat pan angle adjustability. You can have choice of fixed angle in this option instead of free floating. The forward tilt is provided by this feature in order to open the angle between thighs and trunk by reducing disc pressure.
Armrests
The support is provided to the arms with the help of this feature by reducing shoulder work. The armrests can be used for free arm motion during different activities like typing.
Height adjustable armrests
You can reduce too high armrests problems with this feature due to which there can be there can be pressure on undersides of forearms and elbows. The workers need to be in slump or lean position with low armrests. You can keep armrests out of the way during typing or any other activity with the help of height adjustable armrests.
Width adjustable armrests
The distance between armrests can be changed with this adjustability. Splayed elbows can be avoided with armrests which are close to the body due to which wrist will bend to the side during activities. The close positions are not permitted with all adjustments because leaving room is required for maintenance adjustable mechanism.
Padded Armrests
You can be able to avoid uncomfortable pressure on elbows and forearms with this adjustment.
Lumbar Support
The flatting of lumbar spine is prevented with the help of this adjustment feature which may be in some people when seated. This support is done through gentle curves.
Backrest height adjustability
The height of lumbar support of chair backrest can be changed with this feature and it is interpreted to mean change in height of backrest. This feature can be used by different workers according to their preference with hoe their back contacts with lumbar support curve.
Lumbar depth adjustability
There can be affect on size and lumbar support curve in backrest of chair with this feature. It can accommodate different body shapes and preferences.
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