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Caster wheel for rotary axle
Wheel contact
point
Caster length
Figure 88: Caster length
It is also possible to increase the caster
length. The caster length is the distance
between the rotary axle of the caster fork
projected onto the floor and the wheel con-
tact point. The wheel contact point of the
caster wheel trails behind the rotary axle
as it were. The caster length has a stabiliz-
ing effect on moving in a straight line. In-
creasing the caster length can be achieved
by mounting the caster wheel in a different
wheel position on the caster fork (in doing
so, the front seat height or the angle of the
seat changes; see Chapter 18.2). Another
possibility is to bend the caster wheel axle
(see Chapter 23.4) forwards in the direc-
tion of travel in the lower area. The angle
of the caster wheel axle can be adjusted
up to approximately 4 mm over the length
of the caster wheel bearing block out of the
vertical. This increases the caster length
and the tendency to vibrate reduces.
35
TRAVELER usage instructions
Caster wheel for rotary axle tilted
maximum in the direction of travel
Wheel contact
point
Increased caster length
Figure 89: Increased caster length via the inclination
of the caster wheel axle
23.3 Replacing the caster forks
A distinction needs to be made between the
caster forks with a screwed axle and those with
a quick-release axle.
23.3.1 Caster fork with screwed axle
The following instructions are intended
for and may only be carried out by a rehabilita-
tion specialist dealer or PRO ACTIV
To remove the caster fork with screwed
axle, first the aluminium cap on the caster
wheel bearing block must be removed. In order
to release the cap, you can run under the cap
using a commercially available cutter knife and
lift slightly at several points. Then the M12 nut
(AF 19 mm) is loosened using, e.g. an AF
19 mm socket. Now the caster wheel for rotary
Max.
4 mm
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