福祉用モービル機器の対人衝突安全システムとその機能実験(機械力学,計測,自動制御)

概要

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Various kinds of welfare-service mobile equipments such as a motor wheel chair and a tray-carrying cart have two points of common characteristics, considering their safety system for collision with a human. One point is that these mobile equipments move among various passengers walking along sidewalks or corridors. Therefore, the mobile equipments need intrinsical safety measures, in addition to preventive safety measures. The other point is that they move much slower than a general vehicle such as an automobile. Considering the low speed of these mobile equipments, this paper proposes the design concept that prevents a human falling or damage after collision, by absorbing completely the impact energy with an absorber-braking friction system and simultaneously by controlling the impact force from the equipment to a human. The design concept is applied to the safety system for a large-size tray-carrying cart with function of keeping dishes warm or cold in a hospital and a walfare institution. Functional experiments for the safety system were carried out with a test cart constructed similar to the tray-carrying one. It is shown by a series of impact tests with dummies that the impact force between a human and the equipment can be controlled under the human pain tolerance and the condition on human-fall is determined as a function of critical speed, impact force and friction between a dummy sole and a floor.
2008-06-25