| 摘要 |
PROBLEM TO BE SOLVED: To deal with long period vibrations and to adjust the frequency by supporting a guiding plate having a roughly spherical sliding surface along this sliding surface so as to be swung in all directions and fixing a weight to the guiding plate. SOLUTION: The upper surface center of a box case 8 is opened, a ball bearing is disposed as a supporting means around the opening and a guiding plate 5 is placed thereon. A weight 3 is fixed to the spherical guiding plate 5 supported to be swung in all directions by the supporting means 6 via an arm stick 4 and thus a two-dimensional pendulum is constituted. The arm stick 4 is erected on the spherical center part and the lower surface of the box case 8 is placed on the upper end of a pillar 1 and used. The rotational radius of the pendulum is determined by the curvature of the guiding plate 5, but since the sliding surface of the guiding plate 5 is supported, the device is miniaturized. Also, the weight 3 is fixed by the arm stick 4 so as to be slid, the frequency is adjusted by changing its fixing position and long period vibrations are dealt with. |
