| 摘要 |
Devices using electricity such as an elevator were developed since it is inconvenient for the old and the weak to go up and down stairs. However, the devices are too expensive to install and maintain to be installed in all buildings. To solve the problem as above, the stairs wherein the old and the weak can go up and down without power are invented. By using the action of a lever, the old and the weak can move from a low place to a high place by only using the movement of the center of gravity. Therefore, the present invention allows the old and the weak to conveniently use the stairs. Moreover, a level maintenance and inclination preventing bumper and a spring for preventing impact are attached to the stairs for safe use. |
