| 摘要 |
PURPOSE:To substitute vibration of a mass material for shock and vibration at the time of working by forming a hollow section in a part of a base section or a handle section of a vibration equipment, separating the same from a partition constituting the hollow section and providing a given mass material therein. CONSTITUTION:Part of a core cylindrical shaft 4 is formed as a hollow section 41, in which a mass material 5 is provided. A piano wire 6 is overhung with a cantilever from one side to the other against the center of the core cylindrical shaft, and a base of the piano wire 6 is fixed to the core cylindrical shaft at its root, while the piano wire 6 runs through the mass material 5 which is supported by the piano wire 6. A gellike material 7 is disposed cylindrically in a manner that the same surrounds said mass material 5 and the other side of the same is in contact with the inner side wall of the cylindrical shaft. Shocks and vibration waves from the base section 1 are transmitted to the mass material 5 through the piano wire 6. When the weight of the mass material 5, the spring constant of the music piano 6, damping force generated by the gellike material 7 and the like at that time match with the weight of a vibration equipment and a handle section and the like and inherent vibration numbers and the like, the vibration of the mass material 5 transmitting to human body is minimized by the action of the constitution in the hollow section 41 of the core cylindrical shaft 4 in which the mass material 5 is provided working as a dynamic vibration absorber. |
