| 摘要 |
PURPOSE:To permit the continuation of seesaw movement by allowing a swing body having a shiftable weight to be supported uniformly and installing an equillibrium prevention mechanism, in expandable elements made of shape memorizing alloy. CONSTITUTION:In a seesaw B equipped with expandable elements 11 and 12 made of shape memorizing alloy, a projection 13 is installed onto the left side surface of a shaft 4 for supporting a swing rod 1 and a coil-shaped swing spring 14 which extends leftward from the shaft 4 position on a stay 3 and whose root part is fixed at right angles to the stay 3 is installed. The center on the back surface of a flat-circle-shaped obstruction band 15 is fixed at the top edge of the spring 14. The projection 13 pushes-out the obstructoion band 14 in the vicinity of the position where the left side of the swing rod 1 of the seesaw B lowers and th swing rod 1 in the course of lowering is horizontally positioned, and the obstruction band 15 supported by the swing spring 14 returns to the original position when the contact with the projection 13 is released. Therefore, the swing rod 1 maintains the horizontal state only in a moment. |
