| 摘要 |
PROBLEM TO BE SOLVED: To provide a stable base isolation device for providing substantially constant base isolation performance regardless of the relative positional relationship between the support object side and the support side, by improving fluctuation in contact pressure with the guide rail side and fluctuation in a rotational ratio on the basis of a position of a sphere, in a base isolation layer using a guide rail and the sphere. SOLUTION: This base isolation device has the guide rail 1 having mutually separately arranged opposed inclined faces 5 and 6 each composed of a specific inclination and constituted so that an interval between the mutual these inclined faces 5 and 6 becomes gradually small toward both outside ends from a central part, and the sphere 2 rolling by abutting from the inside on the respective inclined faces 5 and 6 of this guide rail. The return function is imparted by displacement in the height direction of the sphere 2 itself generated when its sphere 2 rolls to the outside end side from the central part while abutting on the inclined faces 5 and 6. COPYRIGHT: (C)2007,JPO&INPIT
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