Patent ID: 6725612
Filing Date: 2004-04-27
Classification: E04H

Abstract:
A bi-directional rolling pendulum seismic isolation system for reducing seismic force acting on a structure by rolling pendulum movements, said system comprising:a lower plate forming a rolling path in a first direction; an upper plate forming a rolling path in a second direction; a roller assembly adapted to perform a pendulum motion by rolling and moving along the lower and upper plates, wherein the roller assembly performs the pendulum motion when seismic load is applied, thereby reducing the seismic load of a structure; wherein each of said upper and lower plates has upper and lower channels on which said roller assembly rolls and moves, respectively; wherein said roller assembly includes a lower main body on which a plurality of lower rollers are mounted on a lower portion thereof and an upper main body on which a plurality of upper rollers are mounted on an upper portion thereof, the lower rollers are adapted to roll and move along the lower channel of said lower plate provided on said bi-directional rolling pendulum seismic isolation system, the upper rollers are adapted to roll and move along the upper channel of said upper plate provided on said bi-directional rolling pendulum seismic isolation system; wherein an intermediate main body is inserted between the upper main body and the lower main body, the upper main body and the lower main body are rotated relative to the intermediate main body around a horizontal direction respectively, and then said roller assembly is articulated; wherein said upper and lower rollers are provided with auxiliary drums at both side ends respectively; and wherein said upper and lower plates are respectively provided with auxiliary channels at both sides for inserting the auxiliary drums, the auxiliary channels preventing the rollers from being separated from the channels when said upper and lower rollers of said roller assembly roll along the channels.