立位による負荷軽減と力の伝達方法を考慮したショベリング・ダンプ作業ツールの開発

抄録

In the work of removing soil and sand after sediment disaster, there are scenes that require heavy physical work rather than using machines. In general scooping work, lifting of earth and sand while bending over provides a load on the waist, and it is difficult to work for a long time. In this research, we decided to use only human power for situations where machinery cannot be utilized in sediment removal work, pay attention to work posture in order to reduce physical load, and furthermore focus on how to use the musculoskeletal system to make maximum use of human strength. We decided to reduce the load on the waist by maintaining the standing by the wearable tool. Using the combination of joint torque and joint reaction force with reference to traditional Japanese martial arts, the force is exerted and transmitted effectively. Additionally the force pushing in the vertical direction of the arm and the pedaling force are used with using self-weight. Then, we devised a novel tool applying such ideas to each work operation such as scooping, inserting, scooping, lifting and dumping. The tool corresponds to a height of 150-195 cm, the lift weight and sand weight was 5 kg or more, and the lift height fulfilled 600 mm. Some experiments indicated the potential that the operator maintained the standing position when the tool was used, and the force transmitted effectively due to the joint torque at the time of extension of the arm during gathering, scooping and lifting.