| 摘要 |
PROBLEM TO BE SOLVED: To provide a restoring force mechanism shortened in the length of a coil spring, advantageous in reducing costs and disposed even in a small installation space. SOLUTION: A base isolation object is supported on a support structure movably only in an X-direction by a linear guide. A restoring force mechanism 20 is provided with a cam member 22 having a cam part 2202 extending in the X-direction, a compression coil spring 24 extending in an orthogonal direction to the extending direction of the cam part 2202, and a moving element 26 fitted to one end in the extending direction of the compression coil spring 24 opposed to the cam part 2202. When the base isolation object is displaced from a neutral position, the moving element 26 reaches an inclined part 2202B from a bottom part 2202A of the cam part 2202 to compress the compression coil spring 24, and component force along the X-direction out of the reaction of the compression coil spring 24 acts in a direction of returning the base isolation object into the initial neutral position.
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