Abstract: A long period pendulum damping equipment having right and left pair of longer rods, right and left pair of shorter rods and a tie beam connecting these longer rods and shorter rods one another, in which a tilt angle interlocking means of both rods installed at right and left end portions of the tie beam, respectively, and keeping the tilt angle in one direction of the longer rod with respect to a vertical line always equal to the tilt angle in another direction of the shorter rod or certain ratio times thereof is provided, and a long period is provided and an installation space is made small while making the overall height low by pivoting a weight to either one of the longer or shorter rod.

Abstract: Disclosed is a dynamic damper which is to absorb building vibrations in any horizontal directions, not restricted to one direction. For example, it comprises an oscillating body which is held to move horizontally, a plurality of ball screws which are arranged perpendicularly to each other with a height difference among them and which have a nut portion on the side of the oscillating body and a screw shaft engaging with said nut portion, and motors which reciprocate the oscillating body according to the period of vibration of the building by turning the ball screws.