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Protection of Occupants of Commercial Vehicles by Integrated Seat/Belt Systems
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English
Abstract
Because of the larger manipulation distances and the frequently installed vibration-absorbing seats (with extra vibration damping), restraint systems in commercial vehicles must meet other requirements than those in passenger cars; it was found that integrated seat/belt systems (belt anchorage incorporated in the seat) are required.
Five different types of integrated seat/belt systems were evaluated in frontal crash experiments at an impact speed of 35 km/h, using dummies in a truck cab on the catapult unit. The results were compared with those obtained with conventional three-point belts and with unrestrained dummies.
The experimental results showed that when the dummy was unrestrained or protected only by a lap belt (even if integrated) the upper load limits used as protection criteria were far exceeded because of the heavy impact on the steering wheel; this did not apply to three-point belt systems. Very favourable forward displacement kinematics were achieved when using special seats of adequate structural strength with integrated three-point belt systems; in this case the load on the occupants' bodies lies within acceptable limits, and the occupants do not hit hard against interior parts of the cab.
Further, the experiment showed that a vibration-absorbing seat with integrated three-point belt and additional supports fitted to the seat and backrest is the optimum solution.
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Authors
Topic
Citation
Rüter, G. and Hontschik, H., "Protection of Occupants of Commercial Vehicles by Integrated Seat/Belt Systems," SAE Technical Paper 791002, 1979, https://doi.org/10.4271/791002.Also In
References
- Rüter G. Hontschik H. Jessl P. January 1979
- Hontschik H. Müller E. Rüter G. Necessities and Possibilities of Improving the Protective Effect of Three-Point Seat Belts SAE Paper 770933 1977