7
3.5.1 ADJUSTING BRAKE PRESSURE ON CASTORS
(Does not apply to VELA Samba models)
The brake function works by clamping the wheel
thread, so it may be necessary to adjust the brake
pressure on a worn castor as follows:
• Remove the castor (see mounting instructions
on
www.vela.eu
).
• Tighten the inner plastic part of the castor a half
or a full turn with a shifting spanner (see image
below)
• Remount the castor.
3.5.2 INTERVAL ADJUSTMENT
(Does not apply to VELA Samba models and VELA Tango
300)
As part of the customisation, VELA chairs can be
adjusted in height beyond the range of the gas
spring and actuator. This may be necessary if the
user of the chair grows taller, or if the chair is to be
reused by another user. In this way, the seat height
of the chair may be increased or decreased further.
Interval adjustment instructions for each chair
model (including illustrations and procedure) are
available on our website:
www.vela.eu
3.5.3 ADJUSTING ARMREST AND OTHER
FUNCTIONS
Several of the chair adjustment options are made
with hand screws so the user can set the function
without using tools.
If the user is unable to perform such adjustments,
the hand screws can be replaced with screws and
nuts with common metric threads. However, be
sure to use the right sizes and lengths.
3.5.4 ADJUSTING CLUTCH PLATES
(Does not apply to VELA Samba models and VELA Tango
300)
The seat and back angles are generally adjusted
by clutch plates, which consist of a stack of thin
plates that fix the angle by means of friction. A
spring presses on to the plates and creates friction.
This spring can be tightened if any issues are
encountered with the seat or back angles, even
when the release lever is not activated.
To tighten the clutch plate, tighten the nut as
shown in the figure below. Note: if the nut is
tightened too much, the angle can no longer be
adjusted by activating the release lever. In this case,
loosen the nut a little.
The nut may be hidden behind a plug which can
be removed by hand or with gentle use of a flat-
headed screwdriver.
