| 摘要 |
PROBLEM TO BE SOLVED: To prevent the shift of a rolling element travelling member and the jump-out of a rolling element resulting therefrom when excessive earthquake vibration is input. SOLUTION: The base isolation device 1 comprises linear motion type base isolation mechanisms 2, 2 mounted on a cross-shaped member 3 as an intermediate member. The cross-shaped member 3 is formed by squaring two H-beams 4a, 4b with each other so that their flanges are unevenly parallel. The base isolation mechanisms 2, 2 are mounted on the flange upper face of the H-beam 4a and on the flange lower face of the H-beam 4b with bolts, respectively, so that they are located on the upper and lower sides of the cross-shaped member 3 in their installation attitude. On the rolling element travelling member 21a as part of the base isolation mechanism 2, guide plates 31, 31 are erected along the direction of forming a groove 23 to constrain the lateral movement of the rolling element travelling member 21b. COPYRIGHT: (C)2007,JPO&INPIT
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