Seat height
Enables the seat to be adjusted to the preferred height
What
Raises and lowers the seat
Why
Proper seat height allows the user to maintain foot/floor contact which will transfer some of their body weight to the floor. Proper seat height adjustment can eliminate some of the weight or pressure on the back, pelvis and thighs caused when feet are not in contact with the floor. The chance of reduced circulation resulting from popliteals being in direct contact with the seat is higher when a seat is set to high or too low.
Seat depth
Enables the seat to be adjusted to accommodate different leg lengths.
What
Shortens and lengthens the amount or seat being utilized for pressure distribution.
Why
Providing multiple seat depths allows the same chair to accommodate the 5th percentile (5th%) to 95th percentile (95th%) of the population. Anthropometry is the science that measures the range of body sizes in a population. Anthropometric dimensions for the population are ranked by size and described as percentiles. It is common practice to design for the 5th% female to the 95th% male. For example, shorter people need less seat depth than taller people and this feature allows people of different heights and shapes to use the same chair. Limited circulation and ultimate discomfort can occur with improper seat depth adjustment due to contact or pressure on the popliteal.
Arm height
Enables arms to adjust to your body size and personal preference.
What
Raises and lowers arm rests
Why
Adjusting the arm height lessens the amount of upper body weight the shoulders and neck support. Additionally, it can help to reduce the load on the back, pelvis and thighs.
Arm depth
Enables the user to adjust the arm width based on the body size, task and personal preference.
What
Fore/ aft movement of arm pads
Why
Will accommodate different sized users and when performing targeted tasks, allows user to get closer to the work surface by adjusting the depth rearward.
Arm pivot and width
Enables arms to adjust to your body size and personal preference
What
Changes amount of room between armrests by laterally sliding inward or outward on the chair or pivoting
Why
Helps enable one chair to accommodate the 5th% to 95th% of the population
Tilt Tension
Increases or decreases the amount of effort needed to recline in the chair
What
Adjusts amount of force required to recline
Why
Helps enable one chair accommodate 5th% to 95th% of the population while offering different levels of tension control. Depending on the task and the size of the user, there is a need for more or less support/ tension to maintain upright posture.
Tilt Lock/ limiter
Locks or limits the chair to an upright position
What
Locks back in upright posture or limits how far back the user can recline
Why
Gives the user constant support in an upright posture while working if desired.
Lumbar adjustment (height and depth)
Lumbar adjustment provides support to you lower back muscles
What
Changes position and amount of lumbar support used
Why
The curvature of the lordotic cures varies requiring more or less support depending on size of the user. By offering lumbar adjustment multiple users can be accommodated by one chair.