Patent ID: 6862849

Claim:
Bi-directional sliding pendulum seismic isolation systems for reducing seismic force acting on a structure by sliding pendulum movements, each system comprising: a lower sliding plate forming a sliding path in a first direction and having sliding channels having a radius of curvature; an upper sliding plate forming a sliding path in a second direction and having sliding channels having a radius of curvature; a sliding assembly for reducing the seismic force of the structure by performing a pendulum motion by sliding along the lower and upper sliding plates and including, a main body, lower sliders provided at a lower portion of the main body and sliding along lower sliding channels of the lower sliding plate and upper sliders provided at an upper portion of the main body, the upper sliders sliding along upper sliding channels of the upper sliding plate, each lower and upper sliders including, a slider support, a slider core mounted at an end of the slider support to freely rotate with respect to the slider support and being in frictional contact with said the sliding channels in such a manner that the area contacted with the sliding channels is maintained even though the sliding assembly is located in a random position of the sliding channel and the slider core having an upper surface of a shape corresponding to the radius of curvature of the sliding channels and a lower surface of a rounded shape having a predetermined radius of curvature, and rotates with respect to the slider support when the lower surface is mounted in the slider support.