22
Driving on falling, rising or trans-
verse gradients
For safety reasons, the maximum permitted
gradient is limited because the tip-over sta-
bility and the braking and steering behavi-
our are impaired by a reduced floor/road.
☞
For your own safety, we recommend that
you use the assistance of an accompany-
ing person for driving slopes of more than
1% tilt.
☞
This low gradient value is valid for per-
sons that are not able to effect even
the smallest centre of gravity change
by changing the position of their upper
body.
The accompanying person should be aware
that the control of the wheelchair requires
more strength on a downward slope/ hills
than on a level driving surface and that the-
re is an increased danger of slipping.
Never lean towards the downhill direction
when driving on rising, falling or transverse
gradients.
Avoid jerky changes of the driving condi-
tion (especially with critically adjusted dri-
ving parameters as for example an active
wheel position).
Never drive faster than walking speed.
There is an increased danger of tilting while
driving backwards.
While driving in curves and when turning
on inclinations and slopes there is a danger
of tilting.
The braking force transferred to the driving
surface is much less on a downward slope
than on a level driving surface and is further
reduced by poor road conditions (e.g. rain,
snow, grit, dirt). A dangerous slipping of the
wheels due to excessive braking and an as-
sociated unwanted course deviation must
be avoided by way of a careful dosed bra-
king.
At the end of the downward slope, take care
that the foot plates do not make contact
with the ground and endanger you through
a sudden braking effect.
Transverse surfaces to the driving direction
(e.g. transversely sloped pavements) effect
a turning of your wheelchair in the downhill
direction. You or an accompanying person
must compensate for this drift by a counter-
steering.
Crossing obstacles
After having overcome stairs, support cas-
tors that were previously removed need
to be mounted again resp. support cas-
tors that were swivelled to the side, swi-
velled back into place.
Each crossing of obstacles involves a risk!
Even flat obstacles (e.g. sills, carpet edges,
small steps or similar) represent a danger of
tipping.
The crossing of obstacles is a special dan-
ger situation in which a combination of the
safety advice in the sections headed uphill
driving, downhill driving and driving trans-
verse to a slope must be observed in additi-
on to other safety advice.
For your own safety all obstacles should
only be driven over with an accompanying
person.
The unassisted, safe, crossing of small obsta-
cles (< 4 cm) is only possible with a suffici-
ently safe control of the wheelchair.
Always approach small obstacles, e.g. steps
or curbs, slowly and at a right angle (90°)
until the steering wheels almost touch the
obstacle. Briefly stop the wheelchair and
then drive over the obstacle.
Summary of Contents for 1.155
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