Pedal Bearing Support & Crank; Seating Position; Pedal Bearing Position - ProActiv NJ1 Operating Instructions Manual

18.2 Pedal bearing support & crank

18.2.1 Seating position

The seating position and therefore the pedal
position and the pedal crank length depend on
the upper-body stability or the core muscula-
ture. A suitable adjustment to the arm length
will have been made during the consultation /
measurement procedure.
With weak core musculature, the seating
position should normally be chosen so that the
upper body remains still in an upright position
when operating the crank while driving. This is
particularly important if you have low seating
stability due to missing or weak core muscula-
ture. A rocking motion (forwards and back-
wards) of the upper body or the head should
be avoided where possible. The height of the
pedal bearing in this case is selected to be
slightly higher (chest height or higher).
Sporty drivers with the appropriate trunk
stability relieve their arm musculature by mov-
ing their trunk at the same time. The height of
the pedal bearing in this case can be selected
to be slightly lower (chest height or lower).
Figure 6: Elbows are not completely straight, upper
body is in an upright position
11
Operating instructions NJ1 e-assistant
Figure 7: Distance between the crank and the thigh /
knee
The cranks must not touch the knee or
thigh when they are being turned.
The elbows must not be completely ex-
tended when the crank handles point com-
pletely forward away from the body.
A suitable restraint system must be used if
you have poor seating stability due to a lack of
or weak core musculature. The selection of the
suitable system must be made in conjunction
with your doctor or therapist and / or defined
and implemented by your dealer. There are
various systems available such as chest straps
or four-point safety belts. Also, the dealer can
frequently individually make a system or adapt
one that has been purchased.

18.2.2 Pedal bearing position

In a product equipped with a non-adjustable
pedal bearing support, a subsequent adjust-
ment of the pedal bearing position can only be
achieved by exchanging the pedal bearing
support, the angle adjustment possible on the
steering head as well as the length adjustment
and the spacing of the adapter tube on the
adaptation points on the wheelchair frame (see
operating instructions "Adapter & Adaptation").
The pedal bearing support can be exchanged
by loosening the four M6 fastening screws (SW
5 mm) on the tip fork bridge and the four M6
fastening screws (SW 4 mm) on the pedal
bearing housing. Then the new pedal bearing
support with another length can be inserted
and the 8 fastening screws tightened up to 7
Nm and secured with thread lock fluid. Finally,
Distance crank
to knee