SEISMIC ISOLATOR

To provide a seismic isolator having a structure in which a permanent magnet is combined between a hard ball part of a thrust bearing and a flange part.SOLUTION: In place of a conventional seismic isolator, (N+1) pieces of magnet units and N-pieces of bearing units are alternately superimposed on each other, permanent magnet holding members of (N+1) pieces of the magnet units form rolling faces of rolling bodies at sides with which the rolling bodies contact, and when bearing virtual vertical axes and a pair of up-and-down magnet virtual vertical axes are made to coincide with each other in a view from above, positions of a plurality of permanent magnets which are arranged along magnet virtual circles with the magnet virtual vertical axes of a pair of the up-and-down magnet units with centers are superimposed on positions of the plurality of rolling bodies which are arranged along the magnet virtual circles with the bearing virtual vertical axes of the bearing units as centers, and a magnetic field is thereby generated so that the plurality of permanent magnets whose positions are superimposed on one another in a view from above are attracted with one another.SELECTED DRAWING: Figure 2 【課題】 スラスト軸受の硬球部とフランジ部の間に永久磁石を組合わせた構造をもつ免震装置を提供しようとする。【解決手段】従来の免震装置に換えて、（Ｎ＋１）個の前記磁石ユニットとＮ個の軸受ユニットとが交互に重なり、（Ｎ＋１）個の前記磁石ユニットの前記永久磁石保持材が前記転動体の接する側に前記転動体の転動する転動面を形成し、上から見て前記軸受仮想垂直軸と上下一対の前記磁石仮想垂直軸とを一致させたとき上下一対の前記磁石ユニットの前記磁石仮想垂直軸を中心とする前記磁石仮想円に沿って配置される複数の前記永久磁石の位置が軸受ユニットの軸受仮想垂直軸を中心とする前記軸受仮想円に沿って配置される複数の前記転動体の位置に重なり、上から見て位置が重なる複数の前記永久磁石が互いに引き合う様に磁界を発生する、ものとした。【選択図】 図２