Page - 145 - in Intelligent Environments 2019 - Workshop Proceedings of the 15th International Conference on Intelligent Environments

2. Method of verification 2.1 Design of the telescopic assist suit to support the lower limb Fig[1] On the top part of the telescopic system, hip pad cut to fit the shape of the hip was designed to support the weight of the wearer. On both sides of the hip pad, a belt was attached to the buckle of the belt so that it can be fixed on the wearer’s hip, On the bottom part of the system, a metal plate that acts on the uniaxial direction is attached. On the surface of the plate facing the ground, the rubber sheet was attached. On the surface of the plate facing the ground, the rubber sheet was attached. This allows the system to land directly even if there are changes in the incident angle. At the beginning assistance with the gas powered spring was tested. However, there was a delay in the actual movement of the spring in comparison to the extension of the wearer’s knee. As such, the assist was not felt from the crouching posture to standing posture. In order to adjust the speed of the spring, while the initial design was kept intact, the oil and gas within the system was excluded from the system. In order to examine the differences caused by the strength of the coil spring, it was designed so that coil spring can be changed between 3 types. Fig 1. Telescopic system 2.2 Effect of assist tool to the number of times of lifting Fig[2] 4 subjects were recruited to compare fatigue and the number of times of lifting completed with and without the system. A person with a mental or physical disorder was excluded from the selection, it may have influenced the final results. Weight to be lifted was determined to be 16 kg. This was determined based on Weight was set in consideration of the Labor Standards Act. 40 % of the worker’s weight. For woman above 18, involved in continuous work that includes heavy lifting, the weight should be below 20 kg. The weight of items that have to be lifted in typical aforementioned workplaces is between 10-25 kg. According to instructed lifting motion, the subject will attempt to complete many lifting as he/she can. The number of action completed with and without the assist system will be compared. The subject will start from standing posture. They will flex his/her knee and lift the item placed on the ground. The subject will go back to the standing posture while keeping hold of the item. Once T.Nakazawaetal. /Advancementof IoH/IoT“Assist Suits” toSupportWorkplaces 145