| 摘要 |
PROBLEM TO BE SOLVED: To regulate relative movement of a body to be supported to a base regarding small scale vibration. SOLUTION: A base isolation device 2 to relatively movably and horizontally support a body 4 to be supported is situated on a foundation 3, and a base isolation auxiliary device 1 to block relative movement of the body 4 to be supported during vibration of a given value or less is situated on the foundation 3. The base isolation auxiliary device 1 comprises a means 5 to be locked situated at one of the foundation 3 and the body 4 to be supported; a lock means 8 situated at the other and locked at the means 5 to be locked; a detecting means 6 to detect vibration of a given value or more; and a moving mans 7 to cause the lock means 8 to enter and leave the means 5 to be locked side by the pressure action of fluid based on an output signal from the detecting means 6. During vibration of a given value or more, the moving means 7 separates the lock means 8 from the means 5 to be locked and the relative movement of the body 4 to be supported is allowed, based on an output signal from the detecting means 6.
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