Abstract
The authors have proposed a gravity control method referred to as "3D-Free Rescue Robot." The purpose of the study is to prevent fall / crash by a high place work accident. Cushion effect of a crash is discussed which happens in a human being at the time of a landing to the ground of being accompanied with by a fall from a high place with the robot. The robot is the device which reduces gravity on the earth by using spring balancer. Ability for human work in high place work is expected, assisted by, for example, a rescue robot of removing the snow from the roof is suggested. In addition, three patterns of the use of this device are introduced. Furthermore, this device is effective in not only high place work but also underground work and bad work place of footing.
