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CONVAID USER’S GUIDE
Positioning accessories such as pelvic positioning belts, anterior trunk supports, and lateral trunk
supports may be used while in transit, but are not designed to provide restraint during a crash.
Postural supports and belts should therefore not be relied on for restraint in a vehicle crash and
should be used only in conjunction with lap and shoulder belts that have been designed for restraint in
a motor vehicle and crash tested in accordance with SAE J2249/WC-4:2012 Section 18 and/or ANSI/
RESNA WC19.
Note: Steeper side view pelvic-belt angles are especially important if the pelvic belt is intended to be
used for postural support in addition to occupant restraint in a frontal crash. Steeper angles will reduce
the tendency for a vertical gap to develop between the user and the belt due to compliance of seat
cushions and belt movement, thereby reducing the tendency for the user to slip under the belt for the
belt to ride up on the soft abdomen during normal use.
Note: Steeper belt angles also reduce the tendency for upper-torso belts to pull the pelvic belt onto the
abdomen during frontal impact loading.
Using Postural Belts & Supports
PREFERRED AND OPTIONAL ANGLES OF PELVIC (LAP) BELT RESTRAINTS.
Fig. 136 Fig. 137
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