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Quickie Helium Manual

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14
ENGLISH
Helium Rev.I
Castors
Castor, Castor adapter, Castor fork
From time to time the wheelchair may veer slightly to the right or
left or the castors may flutter. This may be caused by the
following:
• Forward and/or reverse wheel motion has not been set
properly.
• The castor angle has not been adjusted properly.
• Castor and/or rear wheel air pressure is incorrect; wheels do
not turn smoothly.
The optimum adjustment of the castors is required so that the
wheelchair runs in a straight line.
The castor plates must be re-adjusted, and the wheel locks must
be checked every time the rear wheel position has been altered.
Adjusting the castor
To ensure that both forks are set parallel, simply count the teeth
visible on both sides. After setting the castor fork, the teeth will
guarantee a secure position, allowing an adjustment of 16° in 2°
increments. Use the flat side on the front of the castor fork to
check for a right-angled position to the ground (Fig. 4.15).
The patented design allows the castor fork to be turned, so that
it can be reset at right-angles to the ground when the seat angle
is changed.
Setting the directional stability
Release the Allen screws (1) on the underside of the fork. You
can then undo the screw (2). You can now turn the black socket
(3) left or right.
Left – chair pulls to the left
Right – chair pulls to the right
Then tighten up the screw (2) again. Please set a 90° angle from
the fork to the floor.
Now tighten up the screw (1) again. (Fig. 4.16).
Fig. 4.15
+8 -8
Fig. 4.16
1
2
3
Wheel Alignment
Adjusting the wheel alignment
Important: To achieve the very best movement, the rear wheels
must be adjusted to their optimum position, which means
correctly adjusting the wheel alignment.
To do this, measure the distance between both wheels front and
rear to ensure that they are parallel to one another.
The difference between both measurements should not exceed
5 mm.
To adjust the wheels to make them parallel, loosen the screws
and turn the axle sleeve accordingly. Make sure that after any
adjustment work, all screws are tightened correctly (see the
page on torque).
HELIUM tracking adjustment
Setting the toe-in/toe-out to zero
NOTE: A wheelchair with 0° camber cylinders cannot have toe-in
or toe-out. This setting is necessary only with 3° and 6° camber
cylinders.
The term "toe-in or toe-out" defines how well the rear wheels of
the chair are aligned in relation to the ground. This determines
how well the chair will run. Normal resistance or rolling
resistance is present when toe-in is set to zero.
To set toe-in/toe-out to zero: Loosen the Allen screw (1) (one on
each side), that secures the camber tube clamp. Check the ball
in the horizontal (2) plane and turn the angle tube (3) until the
ball is in the centre. Toe-in is now zero.
Before tightening the screws (1), check that the camber tube is
centred left-to-right. The gap should be the same on both sides,
or there should be no gap at all. Tighten the screws to 7 Nm.
(Fig. 4.17 - 4.19).
Adjusting the rear wheelbase width:
The rear wheelbase is defined as the distance between the
upper side of the rear wheels and the backrest tubes, and is
represented by factory setting (125 mm). This has to be
increased if a larger gap between the tyres and the optional
height-adjustable armrests has to be created (Fig. 4.20).
NOTE:When adjusting the rear wheelbase, adjust first one
wheel then the other. If both sides are loosened at the same
time, this will alter the toe-in/toe-out adjustment. To adjust the
rear wheelbase, the parts of the camber (4) move telescopically
into or out of the camber tube (5), and lock into place when they
reach the end. Loosen screw (6) (located closest to the camber
tube) on the left side of the chair. Move the axle receiver inwards
or outwards to achieve the desired wheelbase. Tighten the
screws to 7 Nm. Repeat this procedure on the right side of the
chair and adjust the gap so that it is the same amount as on the
left side.
… 14 …


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