| 摘要 |
PURPOSE: A seesaw is provided to enable children to perform various body movements and center displacements of the gravity by riding the seesaw. CONSTITUTION: A seesaw comprises the following: a rotation guide unit(2) installed on both sides of a supporting plate(1); and a hinge rod including balls, installed on both ends of the supporting plate. The rotation guide unit includes a body(5), a rotation unit(6), and a ball bearing installed on one side of the rotation unit. The rotation unit is fixed to the body with a hinge by forming a central shaft, and installs a bearing in between the central shaft and the body. |
