Evaluation of devices to improve shoulder belt fit.
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1994-08-01
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Edition:Final report; Sept. 1993-Feb. 1994.
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Abstract:Dynamic HYGE sled tests were conducted to evaluate devices which are designed to reposition the
shoulder belt to provide for improved fit or comfort. Three different devices, representative of those
being marketed, were tested using the 3 and 6 year old and the 5th percentile female dummies. The
FMVSS No. 213, "Child Restraint Systems", test seat and test pulse/velocity were used. Tests
comparing the use of a belt positioning booster seat with and without one of the devices was also
conducted.
- mc values greater than 1000 were observed with the Child-Safer™ and the SafeFit™ devices during all
tests with the 3 year old dummy, and during 5 of the 6 tests with the 5th percentile female dummy. 3 ms
chest clip values exceeded 60 g's during 2 of the 3 tests with the Child-Safer™ used on the 6 year old
dummy. Use of the SafeFit™ device resulted in 1 of2 tests with the 3 year old dummy exceeding 60 g's.
All tests met the head and knee excursion criterion. The 3 year old in the booster seat/Child-Safer™
combination exceeded both the mc and chest injury criterion. Some of the belt fit devices kinematically
effected the various sized occupants differently - one resulted in more 10rso rotation about the lap belt,
one tended to delay submarining by the small female dummy until later in the crash event and, under
certain test conditions, all devices contributed to the dummy's torso "rolling-out" of the shoulder belt.
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