Patent ID: 7441376

Claim:
A base isolation device for a structure that suppresses vibration in the out-of-plane direction of a structural member of the structure and comprising: a tension member which is constructed, in a state of tension, between support points, which are located on said structural member and separated by a specified space, and has an overall length that is longer than the space between these support points; first link pieces and second link pieces which become a group, respectively and are located at two locations separated by a space in the direction of length of said tension member, and each of which is connected together such that each can rotate freely, thus forming two sets of connections; and an energizing member and a damping member which are located between said two sets of connections between first link pieces and second link pieces, respectively; wherein the ends of said first link pieces are connected to a intermediate part of said tension member such that they can rotate freely; wherein the ends of said second link pieces are connected to a intermediate part of said structural member such that they can rotate freely; wherein said energizing member keeps tension applied to the said tension member by energizing said two connections in a direction such that they approach each other; and wherein said damping member absorbs said vibration with said vibration, when said two connections carry out relative displacement of said two connections.