SEISMIC ISOLATION DEVICE RESPONDING TO EARTHQUAKE HAVING AT LEAST CERTAIN INTENSITY

摘要

The present invention relates to a seismic isolation device responding to an earthquake in which has a certain intensity, and the seismic isolation device comprises: a lower plate (100) having a plurality of lower moving units (110) formed thereon; an upper plate (200) arranged on the lower plate (100), and having a plurality of upper moving units (210) formed thereon and corresponding to the lower moving units (110); steel balls (300) which are in contact with and are interposed between the lower moving units (110) and the upper moving units (210), and allow the lower plate (100) and the upper plate (200) to move in a horizontal direction with each other; and minor-earthquake movement prevention units (400) for preventing the upper plate (200) from being horizontally moved on the lower plate (100) due to an earthquake of a weak intensity. Thus, the invention is capable of stably protecting the state of installation of structures or equipment or the like during the occurrence of an earthquake.