Abstract
Today in construction work, some workers have to do looking-upward works. Looking-upward work for many hours and many times make fatigue on their neck. In addition, the fatigue also affects the daily life as well as work. Therefore we develop neck-supporter for looking-upward work to reduce fatigue. In the conventional research, the fatigue on neck is reduces 40% by wearing neck-supporter. Current research issue is that assist effect is different from the physique of the neck-supporter's wearer. To solve this problem, we design 4 links statics model to assist their neck ideally considering wearer's physique. As a result of verification of position validity, this model was able to correctly estimate back of the head position. We simulated the assist ratio by using 3-pattern initial attitude degrees. The result was that initial attitude degrees greatly affect assist ratio. Future tasks are looking-upward work experiment to wear neck-supporter and compare the result of experiment to the simulation.
