Operating instructions SPEEDY 4all & 4you & 4teen
31
be one way of reducing fluttering.
However, please note that using a smaller
caster wheel makes it more difficult to
overcome obstacles and makes tipping
necessary more often. The smaller the
caster wheel is, the more driving skill is
required.
Another way to reduce fluttering would for
example be to use a light caster wheel with
the same diameter or, as described above,
with a smaller diameter.
Figure 79: Caster length
It would also be possible to increase the
caster length. The caster length is the
distance between the rotary axle of the
caster wheel fork projected onto the floor
and the wheel contact point. The wheel
contact point of the caster wheel trails
behind the rotary axle as it were. The
caster length has a stabilizing effect on
moving in a straight line. Increasing the
caster length can be attained by mounting
the caster wheel in a different wheel
position on the caster wheel fork (the in
doing so, the front seat height or the angel
of the seat changes, see chapter 17.2).
Another option would be to tilt the caster
wheel axle (see chapter 22.4) from the
vertical position in the lower area in the
direction of travel. The inclination of the
caster wheel axle can be adjusted up to
approx. 4 mm over the length of the caster
wheel bearing block from the vertical
position. This increases the castor length
and the tendency to vibrate reduces.
Figure 80: Increased castor length via the inclination
of the caster wheel for rotary axle
22.3 Replacing the caster wheel forks
A distinction needs to be made between the
caster wheel forks with a screwed axle and
those with a quick-release axle.
Caster wheel for rotary axle
Caster length
Wheel contact
point
Increased castor length
Wheel contact
point
Caster wheel for rotary axle tilted
maximum in the direction of travel
max.
4 mm
