4.2.1b Adjusting Other Full-Feature Chairs

Adjusting other full feature chairs

Audio Transcription

The important parts of an ergonomic chair:

The base holds the wheels and the seat cylinder

Note this chair has carpet casters, designed to allow enough resistance that the body can move before the chair moves.

These casters should NOT be used on a hard floor surface or a plastic floor pad, because the chair becomes unstable and there is a fall liability.

The chair cylinder controls the height of the chair, and that’s controlled by a lever on the other side of the chair.

This particular chair has a seat pan depth adjustment.  We don’t want the seat pan to press against the back of the leg, but we do want good thigh support. We can adjust the pan to allow full thigh support, and still have room behind the back of the knee.

Moving to the other side of the chair we will see three levers or paddles:

The first paddle controls the angle of the chair pan (1:00-1:10).

We can lift the paddle up to let the seat pan “float” and lean into a backward leaning posture.  Reclined postures are fine until the work requires a more forward posture, and the body collapses into slump. The cue here is to sit tall, press the front lever down to let the chair support the upright torso.

The rear lever controls the angle of the back support. Lift the lever and allow the chair back to move to the upright torso.

The center lever controls the height of the chair. If we pull the lever up with the body on the chair, the chair will go down, and it goes up when the body is off the chair. It is critical to find the height of the chair with the best leg strength so that forward and backward postures are well sustained in the best posture to work.

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