Anti-Tip Tubes (Fig. 4) - Permobil Helium User Manual

2.1.3.3
WARNING! Increasing or decreasing the Seat Depth can relocate the center of mass of the person
in relation to the chair, and therefore the overall system's Center of Gravity. The end result is that
the chair may become more or less stable depending on if it has become shorter or longer.
After adjusting, it may now be necessary to move the rear wheel mount fore or aft to compensate
for this change.
To make this adjustment, loosen and remove the two rear wheel mount attaching bolts and nuts
(with attached connecting tube) on either side of the wheelchair frame (four bolts total)(See Fig.4).
CAUTION! If the rear wheel mounts and connecting tube are moved forward on the frame, the chair's
Center of Gravity will move toward the rear, making the front end lighter/easier to tip backward.
If the rear wheel mounts and tube are moved rearward on the frame, the Center of Gravity will move
forward, making the front end more stable.
After the adjustment has been made, replace and retighten the attached bolts and nuts.
WARNING! Any time an adjustment is made to the rear wheel mounts, the balance and operating
characteristics of the wheelchair will be altered. Caution should be taken when the client once again
operates the wheelchair paying special attention to the new balance of the wheelchair.
2.1.4

Anti-tip tubes (Fig. 4).

The anti-tip tubes are mounted to the lower rear of the wheelchair frame. When used properly, they can
prevent the wheelchair from tipping over backward. Use of the anti-tips are recommended at all times.
To put the Anti-tips in operating position, press in the Detent Button (unlocking the tube) and rotate the
tube around so the wheels are in the downmost position. The Detent Button should then again lock the
tube into place.
At times, it may be necessary to disable the anti-tip function. For instance, to raise the front wheels off
of the ground in order to get over a curb or other obstacle. In this circumstance, simply reverse the
above procedure.
WARNING! Because it is possible for the chair to tip over backwards when the anti-tips are not in the
operating (downmost) position, it is imperative that they are in the operating position any time the
wheelchair is in use. Failure to use the anti-tippers may result in the chair tipping over, causing
personal injury and damage to the wheelchair.
Helium User's Manual March 2010
Center of Gravity adjustment (Fig. 4)
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