V-Trak Backrest, User Manual, Page: 14 / 32

Adjusting the backrest shape – Comfort range
Adjusting the vertical profile:
All one-piece Comfort backrests are equipped with
four elastic straps that control the vertical profile of
the backrest. See Figure 21
The straps can be individually tensioned to reinforce
the required posture. Tensioning will change the
shape and extent of the curvature as shown in Figure
22.
The internal shell is designed to flex in response to
sitting loads and will wrap, centralise and stabilise the
occupant. To fully utilise this feature it is
recommended that minimum tension, required to
maintain the desired posture, be used.
However, the user’s postural requirements are
paramount and some straps may require significant
tensioning.
As a guide:

the top strap will be at the lower part of the
thoracic curve;

The second strap will be near the top of the
lumbar curve

the third strap will be at the bottom of the lumbar
curve and the top of the pelvis

the bottom strap will be located around the
middle of the pelvis.
Example: to increase the Lumbar Lordosis or to
promote anterior rotation of the pelvis, the second
and third strap can be tightened. To accommodate a
Lumbar Kyphosis and posterior pelvic tilt these same
straps can be slackened.
To adjust the straps:
From the rear of the backrest, open up the Right
Hand side of the backrest cover.
1. To release the tension in a strap, pull the ring
away from the backrest (thereby releasing the
hook and loop fastener) and set to the desired
tension. See Figure 23.
2. To maintain tension, re-fasten by laying the ring
back against the strap.
3. re-fix the cover to its hook fastener strip.
Figure 21
Figure 22
Figure 23