Handleiding Quickie Helium Pro (pagina 14 van 80) (Nederlands, Engels, Frans)

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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

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.

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