Adjusting The Extension Assist Spring - Nabtesco NK-6 Symphony Mode D'emploi

4-1-2 Adjusting the extension assist
spring
The extension assist spring keeps the knee
joint in the full extension when the
prosthesis is lifted from the floor.
▪ Adjust the adjusting bolt shown in Fig. 10
with a 2.5 mm hexagonal wrench.
▪ To increase the extension assist force,
turn the bolt clockwise. To reduce the
force, turn it counterclockwise.
If the extension assist force is too low for
the prosthesis, there is a possibility of
landing with the knee flexed, and the
CAUTION
user may fall down due to knee buckling.
Adjust the spring so that the foot can
contact to the ground with the knee fully
extended.
The adjusting screw has stoppers between
the maximum and minimum positions. It
can be adjusted in the range of about four
turns.
If the adjusting bolt is turned to an
excessively high torque, it may be
damaged.
CAUTION
Increase stiffness
Fig. 10 How to Adjust the Extension Assist Spring
IMPORTANT
The adjusting screw has been set to a
position which is common to most people
in the factory default setting. When you
are unable to find a suitable position, turn
the screw to reset the position to the
standard setting shown below.
Standard setting: A position obtained by
3 turning counterclockwise
tightened position.
P.15
Extension assist spring
Adjusting bolt
Decrease stiffness
from
EN – 13
fully
41