| 摘要 |
An isolator for protecting a display object from damage as a result of shock and vibration associated with seismic activity or other external forces. The isolator has a base support which is fixed in position with respect to the ground, an intermediate support which interengages with the base support and may slide side-to-side along one axis, a top support for mounting the object thereon and interengaging with the intermediate support to slide side-to-side along a different axis, and restoring means to urge the top and intermediate supports to return to their neutral rest positions. The interengagement between levels is accomplished by tracks that slidably engage rows of roller bearings rotatably mounted along opposite side edges of an adjacent support, and the restoring means include elongated, non-flexible compression spring assemblies formed by stacked Belleville washers that yieldably urge follower rollers against cam tracks formed along the sides of the supports. The cam tracks have central neutral depressions with wedge-shaped rises on opposite sides of the depressions. Alternative embodiments show a single spring and cam arrangement and a double roller bearing arrangement in which roller bearings are mounted at ninety degree angles to engage a cylindrical track bar.
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