In order to offer new ways to provide adjustability and good posture whilst sitting in office chairs, seating manufacturers are continually pressing to innovate on existing designs and to create new ways for improving the well-being of office workers. Here is a selection of the most common adjustable functions:
Height-Adjustable lumbar vertebrae Support (Backrest height adjustment)
To provide comfort and support for the lumbar area of the spine, with the aim of inducing a lordotic S-shaped spinal curve; adjustable in height to suit different users. The Humanfactor chairs are provided with the patented Chiropod®, Therapod® and C-Pod® backrest mechanisms.
Multi-functional Adjustable Armrests
To provide support (and direction) of the forearms in order to provide weight-bearing and relieve stress from the shoulder muscle. Humanfactor offer Heavy Duty (HD), height, width and depth-adjustable (3D), or height, width, depth and twist (4D). For some workstations, armrests restrict body movement and should be avoided.
Depth-Adjustable Seat (Slide Seat)
To provide the ideal weight-bearing support for the thighs and to prevent a constriction of blood flow caused by compression of the thighs at the front edge of the seat. Humanfactor include a 55mm sliding seat in all chairs, allowing for adjustment between 385mm and 495mm in conjunction with seat size selection.
Shorter and Wider Seats
Size also creates a relative feeling of physical perspective. Wider, shorter or longer seat pan lengths are often made available so that the foam on the seat pad is correctly distributed for people of different proportions. All Humanfactor chairs can be fitted with one of four different seat pad sizes.
To provide relief for individuals that are suffering from neck pain, (or to signify authority), headrests are an alternative to larger backrests which can provide additional support to the shoulders for those people with longer trunks. Humanfactor chairs are available with multi-adjustable head rests or a nape pad for the HF7 series.
Back-rake Tension Adjustment
Sometimes referred to as “tension control” this adjustment allows the body’s mass to be supported on reclining. For people of different body mass the strength of the support is an aid to finding an equilibrium position where a to-and-fro rocking motion is achievable.
Seat Height Adjustment (Gas Lifts)
To suit individuals of different body weights, a selection of gas lifts are available so that chairs can be made suitable for people who weigh from around 45kg up to 150kg. In some cases gas-lifts are used that support body mass up to 220kg. Gas lifts are also available in different height specifications which can help to raise the chair even higher from the floor for those with longer floor-to-knee linear measurements, or for counter, mailroom or laboratory applications.
For individuals with specific orthopaedic needs, sensitivities or injuries, the depth and choice of foams can often provide an opportunity to personalise the chair to match requirements. Amputees, pregnant users or people recovering from an accident or injury often find relief from the placement of a cushion or integrated personalised seat pad. One such frequently-requested and recommended item is a Coccyx Cushion or Coccyx Cut-Out where a gap in the foam is created to reduce contact between the sacral vertebrae and the seat pan.