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Head Restraint Measuring Device (HRMD) |
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Soft tissue neck
injury is the most frequent type of injury sustained in motor
vehicle crashes.
Many of these injuries can be prevented or mitigated by an
effectively positioned head restraint.
To be effective the head restraint must be both of adequate height
and close enough to the back of the occupant's head.
Many head restraint designs, especially adjustable restraints, fail
in one or both of these requirements.
The Head Restraint Measuring Device (HRMD) is designed to give
accurate and repeatable measurements of head restraint position.
It attaches to our S.A.E. three dimensional H-point machine and
provides 50th percentile male measurements for both height and
setback of head restraints.
The H-point machine is installed in the vehicle according to normal
procedures.
The HRMD is then mounted on the H-point machine and the neck joint
adjusted to level the headform.
The two probes are then used to measure head restraint height (to
the top of the headform, or extrapolated to determine distance up
from the H-point or the compressed seat cushion).
The second probe is used to measure the amount of setback between
the head and head restraint.
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